Article: 97561 of rec.radio.amateur.homebrew From: "RST Engineering" References: <1148730877.611442.288460@j73g2000cwa.googlegroups.com> <7ldm7294d7a6gdi4tubfsrtqn38ml6t7dl@4ax.com> Subject: Re: Home PCB (Was: Dead Bug) Message-ID: Date: Wed, 31 May 2006 19:30:12 -0700 I appreciate the information but note that: a. I cannot send my students/readers down to Home Depot to pick up a pound of copper chloride along with the muriatic (swimming pool grout etch) acid. b. Now I've got a couple of gallons of etchant to keep around the lab in a proper container for the next go-around. BTW, what is the color of the CuCl2 and the HCl mixed together? Jim "Dr. Grok" wrote in message news:doqfg.11456$ho6.769@trnddc07... >> > > For etchant I find that CuCl2 and HCl work very nice -- and it is > especially advantagous to agitate by bubbling air thru the solution > since not only does it agitate but the oxygen in the air helps > regenerate the CuCl2 in situ. You can continue to bubble air thru it > after the etching is done to completely regenerate the etchant. > > The reactions: > Etching: CuCl2 + Cu -> 2CuCl > Regenerating: 4(CuCl) + O2 + 4HCl -> 4(CuCl2) + 2(H2O) > > Dr. G. Article: 97562 of rec.radio.amateur.homebrew From: Rex Subject: Re: Home PCB (Was: Dead Bug) Date: Thu, 01 Jun 2006 01:37:25 -0700 Message-ID: References: <1148765325.809427.286270@j73g2000cwa.googlegroups.com> <1148798061.072427.295730@j73g2000cwa.googlegroups.com> <127jp81ig9c5hde@corp.supernews.com> <1148892895.924679.57910@j33g2000cwa.googlegroups.com> On 29 May 2006 01:54:56 -0700, "Leon" wrote: > >Dave Platt wrote: >> In article <1148798061.072427.295730@j73g2000cwa.googlegroups.com>, >> Leon wrote: >> >> >I just flush it down the toilet. I think that ferric chloride is used >> >for water treatment and I can't see the small amount of copper doing >> >any harm by the time it has been diluted millions of times. It's only a >> >litre ot so every six months - it's negligible. >> >> By the time you dump it in this way, you aren't dumping pure ferric >> chloride by any means! You're dumping a residual amount of ferric >> chloride, plus a bunch of copper chloride. > >Small quantities are acceptable, here in the UK. > >Leon A book I read a long time back recommended mixing spent solution with concrete powder and sending the resulting brick to the dump. Seems like one of the best ideas I have heard of if you really care about possible impacts. Article: 97563 of rec.radio.amateur.homebrew From: Rex Subject: Re: Home PCB (Was: Dead Bug) Date: Thu, 01 Jun 2006 03:14:20 -0700 Message-ID: <3fft72d94vbu95v5ekqv46n98tvq5t6t7a@4ax.com> References: <1148730877.611442.288460@j73g2000cwa.googlegroups.com> <7ldm7294d7a6gdi4tubfsrtqn38ml6t7dl@4ax.com> <1149153407.908733.273380@f6g2000cwb.googlegroups.com> On 1 Jun 2006 02:16:48 -0700, "Leon" wrote: > >RST Engineering wrote: >> I appreciate the information but note that: >> >> a. I cannot send my students/readers down to Home Depot to pick up a pound >> of copper chloride along with the muriatic (swimming pool grout etch) acid. >> >> b. Now I've got a couple of gallons of etchant to keep around the lab in a >> proper container for the next go-around. >> >> BTW, what is the color of the CuCl2 and the HCl mixed together? > >If you start off with HCl and H2O2, you get CuCl2. You don't need to >actually buy the stuff, it gradually becomes more concentrated with >use. Some form of chemical titration is needed with CuCl2 to ensure >that the concentration is correct and that it has the right pH. > Maybe this will help if you want to try... http://www.xertech.net/Tech/CuCl_ech.html Article: 97564 of rec.radio.amateur.homebrew From: "Caveat Lector" References: <1279c3alj3said0@corp.supernews.com> Subject: Re: what's up with eham? Message-ID: Date: Thu, 1 Jun 2006 06:47:09 -0700 "Brian Murrey" wrote in message news:Zysfg.469$jB5.31@newsread3.news.pas.earthlink.net... > Paying your electric bill adds money to the BPL bunch. > > We must all withhold our electric bill payments until BPL is defeated. > Oh thats the perfect squelch - one of those "Why Didn't I think Of That" Kudos from -- Caveat Lector If you want to know what Hams really think of e-ham - go to URL: http://www.eham.net/articles/13951 A dozen pages of "Welcome Back" > ========================================= > Radio Amateurs - Fill your junk box, from my junkbox! > http://www.hamradparts.com > 73 de KB9BVN > ========================================= > > > "Geoffrey S. Mendelson" wrote in message > news:slrne7bqqp.9k4.gsm@cable.mendelson.com... >> Caveat Lector wrote: >> > RE: The BPL ads -- maybe run your own Anti-BPL ad Huh >> >> You miss the point. >> >> ALL Google ads are BPL adds. Google uses the money they get from Adsense >> to finance BPL networks. That's right, Google invested a lot of money in >> BPL. Using Adsense supports BPL, using Google supports BPL, buying Google >> stock supports BPL. >> >> Got it? Google and BPL are connected. >> >> As for supporting those sites, "you pays your money and you makes your > choice". >> A click on a Google Adsense ad helps pay for BPL. There are other online >> "click here" advertising companies. He chose Google. I chose not to > support >> him. >> >> IMHO it's like running a pro-enviornmentweb site and using the proceeds >> from advertising to fund toxic waste dumping. >> >> Geoff. >> >> -- >> Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM >> IL Voice: (07)-7424-1667 IL Fax: 972-2-648-1443 U.S. Voice: > 1-215-821-1838 >> Visit my 'blog at http://geoffstechno.livejournal.com/ > > Article: 97565 of rec.radio.amateur.homebrew From: "RST Engineering" References: <1148730877.611442.288460@j73g2000cwa.googlegroups.com> <7ldm7294d7a6gdi4tubfsrtqn38ml6t7dl@4ax.com> <1149153407.908733.273380@f6g2000cwb.googlegroups.com> <3fft72d94vbu95v5ekqv46n98tvq5t6t7a@4ax.com> Subject: Re: Home PCB (Was: Dead Bug) Message-ID: Date: Thu, 1 Jun 2006 11:11:47 -0700 Excellent. I gotta get me a copy of that out of print book. Jim > > Maybe this will help if you want to try... > > http://www.xertech.net/Tech/CuCl_ech.html > > Article: 97566 of rec.radio.amateur.homebrew Subject: Re: Home PCB (Was: Dead Bug) From: "Dr. Grok" References: <1148730877.611442.288460@j73g2000cwa.googlegroups.com> <7ldm7294d7a6gdi4tubfsrtqn38ml6t7dl@4ax.com> Message-ID: Date: Fri, 02 Jun 2006 01:44:45 GMT "RST Engineering" wrote in news:Zisfg.51$%v3.104551@news.sisna.com: > I appreciate the information but note that: > > a. I cannot send my students/readers down to Home Depot to pick up a > pound of copper chloride along with the muriatic (swimming pool grout > etch) acid. Send them to HD to get some CuSO4.5H2O [Root killer Zep is one brand] and some CaCl2 [Damp Rid (or in the winter: ice melter)] Make a solution of each [equal molar amounts for each chemical] and mix. Let it sit overnite. The white precipitate is CaSO4 [Plaster of Paris] and the Blue-green solution on top is the CuCl2 solution. Best to filter that to remove any remaining CaSO4. Now you have your starting supply of CuCl2 and as you can see from the equations you create more of it as you etch. If you get too much offer it to another ham to get him/her started. > > b. Now I've got a couple of gallons of etchant to keep around the lab > in a proper container for the next go-around. > > BTW, what is the color of the CuCl2 and the HCl mixed together? A very bright green. When it turns a dirty olive green you know it has too much CuCl so start bubbling air thru until its bright green again. > > Jim > > > > "Dr. Grok" wrote in message > news:doqfg.11456$ho6.769@trnddc07... >>> >> >> For etchant I find that CuCl2 and HCl work very nice -- and it is >> especially advantagous to agitate by bubbling air thru the solution >> since not only does it agitate but the oxygen in the air helps >> regenerate the CuCl2 in situ. You can continue to bubble air thru it >> after the etching is done to completely regenerate the etchant. >> >> The reactions: >> Etching: CuCl2 + Cu -> 2CuCl >> Regenerating: 4(CuCl) + O2 + 4HCl -> 4(CuCl2) + 2(H2O) >> >> Dr. G. > > Article: 97567 of rec.radio.amateur.homebrew Message-ID: <447FA5B8.4ED9C96F@edge.net> From: "Bob G. Mahrenholz" Subject: Wireless World & Radio Engineering magazines Date: Fri, 02 Jun 2006 02:44:06 GMT Hi' I'm needing a copy of articles on bandpass filtering using negative mutual coupling (a la J.W. Miller) in the February 18, 1931 issue of Wireless World and in the December, 1936 issue of Radio Engineering magazine. Will pay a reward. Thanks, Bob bobm@edge.net Article: 97568 of rec.radio.amateur.homebrew From: Dan Winker Subject: Want To Build a Directional, Amplified Medium Wave Receiving Antenna - Where To Start? Date: Fri, 02 Jun 2006 20:29:10 -0000 Message-ID: <12817sm5nfc9v3a@corp.supernews.com> Hi all, I'm not an amateur radio operator, but I do have the 1997 ARRL handbook, I am capable of understanding most of what it says, and this is definitely a question for a ham operator. I live out in the country where the internet barely reaches and little radio stations are weak. My wife has recently taken to needing to listen to the ghost hunters show at 10 to midnight Sunday nights on KLBP which seems to me to be 5kW. It comes in acceptably during the day, but at night it's extremely weak and seems to be interfered with by another station. Maybe KLBP has to reduce their power at night. I don't know. Now, instead of listening to the show Sunday night I can download the pod-cast Monday at work and give that to her. But if you're going to listen the the ghost hunting show, it seems much better to do it live, late at night, on an AM radio. Besides, that raises the possibility of calling in sometime. A huge loop seems like overkill and not directional anyway. I don't think I have room for a dipole (is that 318 ft?). What I'm inventing in my own head is a loop with lots of turns. I think they used them in the old days. They were like a coil of wire mounted on a 2 ft by 3 ft board. Would (1005/1.47 = 684) feet of wire in a 3 ft diameter coil form some kind of ghost show antenna (for KLBP)? I'm quite capable of reading parts of the ARRL handbook, ordering stuff from Digi-Key, and soldering. Where should I start? What about making it amplified? BTW, here's my crystal radio that currently doesn't do anything because it doesn't have an antenna. http://www.visi.com/~dwinker/ddd_xtal_radio/ (It is finished now. I gotta get a final picture up now that I've posted this). It'd be cool if I could make that work again. I wouldn't feel to bad if it took an amplified antenna to make it work. Thanks, Dan Article: 97569 of rec.radio.amateur.homebrew From: "maw" Subject: Patrolman Pro-45 (circa 1977) Message-ID: Date: Fri, 2 Jun 2006 19:38:16 -0400 found this old Realistic Pro-45 "beast" of a scanner and it amazingly works. it's an eight channel scanner that uses crystals. currently a local 2-meter repeater is the only active frequency in my area. can somebody help get or sell me some crystals and/or the manual for this radio? the crystals i'm looking for are: 148.525mhz 150.100mhz 154.935mhz 154.620mhz 156.800mhz 162.400mhz please reply by email. thanks! Article: 97570 of rec.radio.amateur.homebrew Message-ID: <44810E7E.5EEBE593@flying_moose.net> From: clark Subject: Re: TS520 dismantling.... References: <1148824863.994074.273130@j55g2000cwa.googlegroups.com> Date: Sat, 03 Jun 2006 04:22:24 GMT http://groups.yahoo.com/group/TS-520_820_530_830/ 73 Article: 97571 of rec.radio.amateur.homebrew From: "Phil Allison" Subject: Re: 2SC2397 Datasheet ? Date: Sat, 3 Jun 2006 21:20:18 +1000 Message-ID: <4ed9jjF1dr180U1@individual.net> References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> "Steve Kavanagh" > > I'm looking for a data sheet for the 2SC2397. www.datasheetarchive.com > appears to have just a 1 line description. Does anyone have more ? > ** Appears to be an obsolete type. Several references quote the " MJE3055T " as being a replacement with similar or better specs. ...... Phil Article: 97572 of rec.radio.amateur.homebrew From: Barry OGrady Subject: Re: Patrolman Pro-45 (circa 1977) Date: Sat, 03 Jun 2006 21:26:29 +1000 Message-ID: References: On Fri, 2 Jun 2006 20:38:13 -0500, "g. beat" <@> wrote: >"maw" wrote in message >news:PZ3gg.398$Uy1.116@read1.cgocable.net... >> found this old Realistic Pro-45 "beast" of a scanner and it amazingly >> works. >> it's an eight channel scanner that uses crystals. >> >> currently a local 2-meter repeater is the only active frequency in my >> area. >> >> can somebody help get or sell me some crystals and/or the manual for this >> radio? >> >> the crystals i'm looking for are: >> >> 148.525mhz >> 150.100mhz >> 154.935mhz >> 154.620mhz >> 156.800mhz >> 162.400mhz >> >> please reply by email. >> >> thanks! > >The Realistic Pro-45 Patrolman Scanning Radio was introduced in 1978. If its like the scanner I saw in a movie recently it will continue to scan while audio is coming out. Barry ===== Home page http://members.iinet.net.au/~barry.og Article: 97573 of rec.radio.amateur.homebrew From: Spehro Pefhany Subject: Re: 2SC2397 Datasheet ? Date: Sat, 03 Jun 2006 07:54:06 -0400 Message-ID: <17t282p67fbn48qruumetrmqjhk6h9mtd5@4ax.com> References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> On 3 Jun 2006 04:09:04 -0700, the renowned "Steve Kavanagh" wrote: >I'm looking for a data sheet for the 2SC2397. www.datasheetarchive.com >appears to have just a 1 line description. Does anyone have more ? > >Steve You can see from the Kanji in the transistor manual that the original manufacturer is Hitachi (http://www.trexon.com/hitachi.gif) ..along with quite a few parameters. It's designed to be an RF power amplifier, especially for CB. This is supposed to be a similar part: http://www.cpcares.com/pdf/2SC1817.PDF with a similar (but less) power output rating (15W vs 18W for the 2SC2397 @27MHz output). Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Article: 97574 of rec.radio.amateur.homebrew From: Spehro Pefhany Subject: Re: 2SC2397 Datasheet ? Date: Sat, 03 Jun 2006 07:55:55 -0400 Message-ID: References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4ed9jjF1dr180U1@individual.net> On Sat, 3 Jun 2006 21:20:18 +1000, the renowned "Phil Allison" wrote: > >"Steve Kavanagh" >> >> I'm looking for a data sheet for the 2SC2397. www.datasheetarchive.com >> appears to have just a 1 line description. Does anyone have more ? >> > > > ** Appears to be an obsolete type. > >Several references quote the " MJE3055T " as being a replacement with >similar or better specs. Gack! Well, you can bolt it in the same place and the pinout is the same, but things kinda fall apart from there.. considering the ft of the 3055 is 2MHz vs 100MHz for the 2SC2397. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Article: 97575 of rec.radio.amateur.homebrew From: "Phil Allison" Subject: Re: 2SC2397 Datasheet ? Date: Sat, 3 Jun 2006 22:40:39 +1000 Message-ID: <4edea7F1edbd3U1@individual.net> References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4ed9jjF1dr180U1@individual.net> "Spehro Pefhany" > >> ** Appears to be an obsolete type. >> >>Several references quote the " MJE3055T " as being a replacement with >>similar or better specs. > > Gack! Well, you can bolt it in the same place and the pinout is the > same, but things kinda fall apart from there.. considering the ft of > the 3055 is 2MHz vs 100MHz for the 2SC2397. ** The Motorola " POWER Data Book" of 1982, lists the devices as "similar replacements" - as does the similar " Bipolar Power Transistor Data " of 1987. I found at least 7 web sites, including the ST Microelectronics site, with the same info. Seems some staffer at Motorola made an error in the early 80s and it has gone on and on and on ........ ....... Phil Article: 97576 of rec.radio.amateur.homebrew From: Spehro Pefhany Subject: Re: 2SC2397 Datasheet ? Date: Sat, 03 Jun 2006 09:10:44 -0400 Message-ID: <2823829uu6kp759v8jkbsgh6s1f5m3fhq3@4ax.com> References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4ed9jjF1dr180U1@individual.net> <4edea7F1edbd3U1@individual.net> On Sat, 3 Jun 2006 22:40:39 +1000, the renowned "Phil Allison" wrote: > >"Spehro Pefhany" > >> >>> ** Appears to be an obsolete type. >>> >>>Several references quote the " MJE3055T " as being a replacement with >>>similar or better specs. >> >> Gack! Well, you can bolt it in the same place and the pinout is the >> same, but things kinda fall apart from there.. considering the ft of >> the 3055 is 2MHz vs 100MHz for the 2SC2397. > > > >** The Motorola " POWER Data Book" of 1982, lists the devices as "similar >replacements" - as does the similar " Bipolar Power Transistor Data " of >1987. > >I found at least 7 web sites, including the ST Microelectronics site, with >the same info. > >Seems some staffer at Motorola made an error in the early 80s and it has >gone on and on and on ........ Maybe someone who was sick of the breaker-breaker-one-nine-rubber-duck CB craze of the day? ;-) Unfortunately lots of references on the 'net may just mean that the stuff was all copied from one source. BTW, any Japanese speakers here? The Japanese characters for Hitachi appear to be only two syllables. The characters would be pronounced "ri4 li4" in Chinese ('sun' or 'day' and 'stand'), maybe "hi ta" in Japanese? Is the "chi" just tacked on in English? Mazda is the opposite-- it's three syllables in Chinese (and probably Japanese as well). And Alps (the component maker)is two syllables in Japanese. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Article: 97577 of rec.radio.amateur.homebrew From: Rich Grise Subject: Re: 2SC2397 Datasheet ? Message-ID: References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4ed9jjF1dr180U1@individual.net> <4edea7F1edbd3U1@individual.net> <2823829uu6kp759v8jkbsgh6s1f5m3fhq3@4ax.com> Date: Sat, 03 Jun 2006 14:41:19 GMT On Sat, 03 Jun 2006 09:10:44 -0400, Spehro Pefhany wrote: > On Sat, 3 Jun 2006 22:40:39 +1000, the renowned "Phil Allison" >>... >>Seems some staffer at Motorola made an error in the early 80s and it has >>gone on and on and on ........ > > Maybe someone who was sick of the breaker-breaker-one-nine-rubber-duck > CB craze of the day? ;-) Unfortunately lots of references on the > 'net may just mean that the stuff was all copied from one source. > > BTW, any Japanese speakers here? The Japanese characters for Hitachi > appear to be only two syllables. The characters would be pronounced > "ri4 li4" in Chinese ('sun' or 'day' and 'stand'), maybe "hi ta" in > Japanese? Is the "chi" just tacked on in English? With Japanese Kanji, there's no telling. ;-) Fujiyama, for example, is two Kanjis. > Mazda is the opposite-- it's three syllables in Chinese (and probably > Japanese as well). And Alps (the component maker)is two syllables in > Japanese. > In Katagana or Hiragana, Ma zu da is three, yes, but A ru pu su is _four_! ;-) (I think they're pronounced more like Ma z' da and A r' p' s'. :-) ) To yo ta comes out just right, however. :-) Cheers! Rich Article: 97578 of rec.radio.amateur.homebrew From: "Richard W. Solomon, W1KSZ" Subject: WTD: Molex .062 Crimp Tool Message-ID: Date: Sat, 03 Jun 2006 19:33:13 GMT Anyone have one they can part with ? Tnx, Dick, W1KSZ Article: 97579 of rec.radio.amateur.homebrew From: "Brian Hill" Subject: Nice HBR 13C Message-ID: Date: Sat, 3 Jun 2006 15:04:02 -0500 Heres some pics of my new HBR13C. http://webpages.charter.net/brianhill/hbr13c1.jpg http://webpages.charter.net/brianhill/hbr13c2.jpg http://webpages.charter.net/brianhill/hbr13c3.jpg http://webpages.charter.net/brianhill/hbr13c4.jpg http://webpages.charter.net/brianhill/hbr13c5.jpg -- Regards B.H. Brian's Radio Universe http://webpages.charter.net/brianhill/500.htm Article: 97580 of rec.radio.amateur.homebrew From: Dan Winker Subject: Re: Want To Build a Directional, Amplified Medium Wave Receiving Antenna - Where To Start? Date: Sat, 03 Jun 2006 22:48:56 -0000 Message-ID: <12844eo7f445t4d@corp.supernews.com> References: <12817sm5nfc9v3a@corp.supernews.com> Thanks All! Tomorrow I try my luck at making a loop. I found a good website about it at http://www.mindspring.com/~loop_antenna/ . The guy says it has a good null, so I'm hoping that can be used to block the offending station that's interfering. Looks like I have to take one of my variable caps off my crystal radio though. The things I'm willing to do for my wife! (Ha! like I'm not really going to enjoy this). If that doesn't work I'm workin' her to be able to get this $200 antenna. http://dxtools.com/QX.htm Again, Thanks All! Dan Article: 97581 of rec.radio.amateur.homebrew From: "Ralph Mowery" References: <12817sm5nfc9v3a@corp.supernews.com> <12844eo7f445t4d@corp.supernews.com> Subject: Re: Want To Build a Directional, Amplified Medium Wave Receiving Antenna - Where To Start? Message-ID: Date: Sat, 03 Jun 2006 23:37:17 GMT "Dan Winker" wrote in message news:12844eo7f445t4d@corp.supernews.com... > Thanks All! Tomorrow I try my luck at making a loop. I found a good website about it at http://www.mindspring.com/~loop_antenna/ . The guy says it has a good null, so I'm hoping that can be used to block the offending station that's interfering. Looks like I have to take one of my variable caps off my crystal radio though. The things I'm willing to do for my wife! (Ha! like I'm not really going to enjoy this). > > If that doesn't work I'm workin' her to be able to get this $200 antenna. http://dxtools.com/QX.htm > Make sure to get a money back guarntee if it does not work for your application. If you are to the east or west of the station you may be fighting a loosing battle. The station may be shifting the antenna patern north and south at night. Article: 97582 of rec.radio.amateur.homebrew From: "doug" Subject: need: smd transistor Message-ID: Date: Sun, 04 Jun 2006 01:28:10 GMT Hi all, am looking for source in UK for Sony dual gate n channel surface mount transistors type SGM 2016M to repair yaesu ft8000 radio. have checked online parts lists for the usual firms in uk,with no luck! want three off, or does anyone know of equivalent type? thanks for any help. doug. Article: 97583 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: need: smd transistor Message-ID: <9qj48258c57g4hodup6aavgd79rsvq5mi2@4ax.com> References: Date: Sun, 04 Jun 2006 03:11:33 GMT On Sun, 04 Jun 2006 01:28:10 GMT, "doug" wrote: >Hi all, am looking for source in UK for Sony dual gate n channel surface >mount transistors type SGM 2016M to repair yaesu ft8000 radio. have checked >online parts lists for the usual firms in uk,with no luck! want three off, >or does anyone know of equivalent type? thanks for any help. doug. > No but likely that part number is a inhouse designation. One way to cheat the whole mess is look up a SMT DG fet sourced from Sony as I bet there only a few parts to pick from. Alternate is Phillips also does SMT DG fets and likely they would work. Allison Article: 97584 of rec.radio.amateur.homebrew From: "Dale Parfitt" References: Subject: Re: Nice HBR 13C Message-ID: Date: Sun, 04 Jun 2006 03:32:40 GMT "Brian Hill" wrote in message news:TWlgg.64$RH5.62@fe03.lga... > Heres some pics of my new HBR13C. > http://webpages.charter.net/brianhill/hbr13c1.jpg > http://webpages.charter.net/brianhill/hbr13c2.jpg > http://webpages.charter.net/brianhill/hbr13c3.jpg > http://webpages.charter.net/brianhill/hbr13c4.jpg > http://webpages.charter.net/brianhill/hbr13c5.jpg > > -- > > Regards > B.H. > > Brian's Radio Universe > http://webpages.charter.net/brianhill/500.htm >Hi Brian, Gorgeous. I too am a big fan of the Eddystone dial and used it in my W7ZOI solid state HBR. Can you tell us what the front panel controls are, and perhaps a short functional block diagram in words?? Dale W4OP Article: 97585 of rec.radio.amateur.homebrew From: Alan Peake Subject: Re: Diff between xtal with 3 leads vs. 2 leads? Date: Sun, 04 Jun 2006 16:35:09 +1000 Message-ID: <44827F1D.5020507@killspam.internode.on.net> References: <1149356781.814929.313650@i40g2000cwc.googlegroups.com> > Working on converting an old CB to a 10 meter beacon. Obtained some > xtals in the correct range I need, but they have 3 leads instead of 2. > Are these resonators? Can I use them as direct replacement for xtals in > the CB radio? Where does the 3rd lead go? Do a search for 21.4 MHz filters. They have three leads and are used as bandpass filters in UHF CB radios and may also turn up in 27MHz radios. The middle lead probably goes to ground. Alan Article: 97586 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: Diff between xtal with 3 leads vs. 2 leads? Message-ID: References: <1149356781.814929.313650@i40g2000cwc.googlegroups.com> Date: Sun, 04 Jun 2006 15:19:08 GMT On 3 Jun 2006 10:46:21 -0700, "C" wrote: >Hi, > >Working on converting an old CB to a 10 meter beacon. Obtained some >xtals in the correct range I need, but they have 3 leads instead of 2. >Are these resonators? Can I use them as direct replacement for xtals in >the CB radio? Where does the 3rd lead go? > >BTW, if anyone has a schematic for a barebones 10M tx, 1W +/-, please >send a copy if you can with parts list. >Tnx! If you can be more specific on the CB I can give a better answer. I will assume US AM/SSB radios. The likley case is a 10.695 crystal filter. The second likely case is ground lead on common crystal. IF foreign (outside usa) FM radio then a 10.7mhz crystal filer is packaged that way. Those filters are available in 4.5nhz, 10.7, 10.8 21.4 and 45mhz commonly and there are others. Allison Article: 97587 of rec.radio.amateur.homebrew Message-ID: <4483017D.F4D63FC9@pcbdude.org> From: raul Subject: Re: 2SC2397 Datasheet ? References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> Date: Sun, 04 Jun 2006 15:51:27 GMT While I do not have a datasheet, NTE quickcross has no equal, here is some info for you (I'm not the author) Many Asian-sourced semiconductors are marked per the EIAJ standard Electronic Industries Association of Japan, which uses this code: 2Saxxxxb 2S -- a hint that it's not JEDEC a -- the type of semiconductor, where A = PNP bipolar B = PNP bipolar C = NPN bipolar D = NPN bipolar F = SCR J = P-channel FET K = N-channel FET xxxx= 3- or 4-digit number b = a suffix sometimes applied to designate updated versions Usually but not always, if xxxx for 2A or 2B is under 500, or 2SC or 2SD is under 100, it's germanium; else silicon for bipolars. Provided by Jim N6OTQ Article: 97588 of rec.radio.amateur.homebrew From: Jamie Subject: Re: 2SC2397 Datasheet ? References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4483017D.F4D63FC9@pcbdude.org> Message-ID: Date: Sun, 04 Jun 2006 13:27:21 -0700 raul wrote: > While I do not have a datasheet, > NTE quickcross has no equal, > > here is some info for you (I'm not the author) > > Many Asian-sourced semiconductors are marked per the > EIAJ standard > Electronic Industries Association of Japan, > which uses this code: > > 2Saxxxxb > > 2S -- a hint that it's not JEDEC > > a -- the type of semiconductor, where > A = PNP bipolar > B = PNP bipolar > C = NPN bipolar > D = NPN bipolar > F = SCR > J = P-channel FET > K = N-channel FET > xxxx= 3- or 4-digit number > > b = a suffix sometimes applied to designate updated > versions > > Usually but not always, > if xxxx for 2A or 2B is under 500, or 2SC or > 2SD is under 100, it's germanium; > else silicon for bipolars. > > Provided by > Jim N6OTQ > > (HIT) NPN 60V 8A TRANSISTOR T0-220 Vcbo = 60v Vbeo = 5 v Pc = 25w/ etc.. etc.. looks like a generic 2n3055 type.. -- Real Programmers Do things like this. http://webpages.charter.net/jamie_5 Article: 97589 of rec.radio.amateur.homebrew From: Spehro Pefhany Subject: Re: 2SC2397 Datasheet ? Date: Sun, 04 Jun 2006 15:02:13 -0400 Message-ID: <8gb68211vu7fq83i81in2kbaksdjqm87a7@4ax.com> References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4ed9jjF1dr180U1@individual.net> <4edea7F1edbd3U1@individual.net> <2823829uu6kp759v8jkbsgh6s1f5m3fhq3@4ax.com> On Sat, 03 Jun 2006 14:41:19 GMT, the renowned Rich Grise wrote: >On Sat, 03 Jun 2006 09:10:44 -0400, Spehro Pefhany wrote: >> On Sat, 3 Jun 2006 22:40:39 +1000, the renowned "Phil Allison" >>>... >>>Seems some staffer at Motorola made an error in the early 80s and it has >>>gone on and on and on ........ >> >> Maybe someone who was sick of the breaker-breaker-one-nine-rubber-duck >> CB craze of the day? ;-) Unfortunately lots of references on the >> 'net may just mean that the stuff was all copied from one source. >> >> BTW, any Japanese speakers here? The Japanese characters for Hitachi >> appear to be only two syllables. The characters would be pronounced >> "ri4 li4" in Chinese ('sun' or 'day' and 'stand'), maybe "hi ta" in >> Japanese? Is the "chi" just tacked on in English? > >With Japanese Kanji, there's no telling. ;-) Fujiyama, for example, >is two Kanjis. So it's not one syllable per character like Chinese? Interesting. >> Mazda is the opposite-- it's three syllables in Chinese (and probably >> Japanese as well). And Alps (the component maker)is two syllables in >> Japanese. >> > >In Katagana or Hiragana, Ma zu da is three, yes, but A ru pu su is _four_! ;-) >(I think they're pronounced more like Ma z' da and A r' p' s'. :-) ) >To yo ta comes out just right, however. :-) > >Cheers! >Rich Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Article: 97590 of rec.radio.amateur.homebrew Message-ID: <44832C95.D2F1E7BD@edge.net> From: "Bob G. Mahrenholz" Subject: Re: Wireless World & Radio Engineering magazines References: <447FA5B8.4ED9C96F@edge.net> Date: Sun, 04 Jun 2006 18:56:24 GMT Leon: I did find them and it looks real promising . They have the issue of Wireless World that I need. I will probably have to order a copy of the Table of Contents to see what page the article is on. Looks like a good resource. Thanks a lot. Bob Leon wrote: > Bob G. Mahrenholz wrote: > > Thanks for the idea. Do you know how to contact the British Library? I guess > > I could search the internet. > > > > I've had problems in the past. I can find a library that has the journal > > (usually in universities) but they all want you to go thru your local library > > to order a copy of an article. My local library doesn't want to try and get > > anything out of state. > > > > Also libraries all want the page numbers and the title of the article and the > > author and I don't know that on these articles. That's why I was hoping to > > find someone who actually had the magazine. > > You might be able to find it from their web site: > > http://www.bl.uk/ > > 73, Leon Article: 97591 of rec.radio.amateur.homebrew From: "doug" References: <9qj48258c57g4hodup6aavgd79rsvq5mi2@4ax.com> Subject: Re: need: smd transistor Message-ID: Date: Sun, 04 Jun 2006 22:32:52 GMT wrote in message news:9qj48258c57g4hodup6aavgd79rsvq5mi2@4ax.com... > On Sun, 04 Jun 2006 01:28:10 GMT, "doug" > wrote: > > >Hi all, am looking for source in UK for Sony dual gate n channel surface > >mount transistors type SGM 2016M to repair yaesu ft8000 radio. have checked > >online parts lists for the usual firms in uk,with no luck! want three off, > >or does anyone know of equivalent type? thanks for any help. doug. > > > > No but likely that part number is a inhouse designation. One way to > cheat the whole mess is look up a SMT DG fet sourced from Sony > as I bet there only a few parts to pick from. Alternate is Phillips > also does SMT DG fets and likely they would work. > > Allison thanks for reply Allison, will check for Phillips equivalent. doug. Article: 97592 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: need: smd transistor Message-ID: <9du682tk4i5hjb80lrug93ikdruskiqi8f@4ax.com> References: <9qj48258c57g4hodup6aavgd79rsvq5mi2@4ax.com> Date: Mon, 05 Jun 2006 00:23:00 GMT On Sun, 04 Jun 2006 22:32:52 GMT, "doug" wrote: > > wrote in message >news:9qj48258c57g4hodup6aavgd79rsvq5mi2@4ax.com... >> On Sun, 04 Jun 2006 01:28:10 GMT, "doug" >> wrote: >> >> >Hi all, am looking for source in UK for Sony dual gate n channel surface >> >mount transistors type SGM 2016M to repair yaesu ft8000 radio. have >checked >> >online parts lists for the usual firms in uk,with no luck! want three >off, >> >or does anyone know of equivalent type? thanks for any help. doug. >> > >> >> No but likely that part number is a inhouse designation. One way to >> cheat the whole mess is look up a SMT DG fet sourced from Sony >> as I bet there only a few parts to pick from. Alternate is Phillips >> also does SMT DG fets and likely they would work. >> >> Allison > > >thanks for reply Allison, will check for Phillips equivalent. doug. > You may have to replace by inference(similar specs or function) rather than direct part number match. Allison Article: 97593 of rec.radio.amateur.homebrew From: David Subject: Matching to Crystal Filter Message-ID: Date: Mon, 05 Jun 2006 02:05:00 GMT Hi, I am wanting to match the output of a SA602 Mixer to a 45MHz, 4-pole crystal filter and then match the output of the filter to the input of a SA605 IF receiver. The filter datasheet specifies the termination impedance of 800 Ohms and 3pF. I have not used crystal filters before and would appreciate some advice for typology of a suitable match. The SA605 has a input impedance of 4500 Ohms par 3.5pF. Apparently they have a "sweet spot" if matched to 800R. The SA602 has output impedance of 1500 Ohm (not sure of capacitance). From what I can see, if I placed a 1k resistor across the SA605 input, this would give me close to 800R//3pF but not max. transfer of signal. Some of the confusion I have is what to do with the 3pF termination requirement. I am not sure if this means that I could match the resistive components using an "L" or "Tapped C match" and then add another 3pF to each side of the filter ??? Any help much appreciated Regards David Article: 97594 of rec.radio.amateur.homebrew Message-ID: <4483A66E.17CD2FC5@earthlink.net> From: "Michael A. Terrell" Subject: Re: 2SC2397 Datasheet ? References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4483017D.F4D63FC9@pcbdude.org> Date: Mon, 05 Jun 2006 03:35:49 GMT Jamie wrote: > > (HIT) NPN 60V 8A TRANSISTOR T0-220 > Vcbo = 60v > Vbeo = 5 v > Pc = 25w/ > etc.. > etc.. > looks like a generic 2n3055 type.. Really? What are you going to do with the other 90 watts? The TO-3 version is rated at 115 watts It isn't even close. Even the plastic version is 90 watts -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 97595 of rec.radio.amateur.homebrew From: Jamie Subject: Re: 2SC2397 Datasheet ? References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4483017D.F4D63FC9@pcbdude.org> <4483A66E.17CD2FC5@earthlink.net> Message-ID: Date: Mon, 05 Jun 2006 00:10:49 -0700 Michael A. Terrell wrote: > Jamie wrote: > >>(HIT) NPN 60V 8A TRANSISTOR T0-220 >>Vcbo = 60v >>Vbeo = 5 v >>Pc = 25w/ >>etc.. >>etc.. >> looks like a generic 2n3055 type.. > > > > Really? What are you going to do with the other 90 watts? The TO-3 > version is rated at 115 watts It isn't even close. Even the plastic > version is 90 watts > what to do with the remaining watts? i don't see your point? -- Real Programmers Do things like this. http://webpages.charter.net/jamie_5 Article: 97596 of rec.radio.amateur.homebrew From: Rex Subject: Re: Want To Build a Directional, Amplified Medium Wave Receiving Antenna - Where To Start? Date: Sun, 04 Jun 2006 20:56:18 -0700 Message-ID: References: <12817sm5nfc9v3a@corp.supernews.com> On Fri, 02 Jun 2006 20:29:10 -0000, Dan Winker wrote: >I live out in the country where the internet barely reaches and little radio stations are weak. My wife has recently taken to needing to listen to the ghost hunters show at 10 to midnight Sunday nights on KLBP which seems to me to be 5kW. It comes in acceptably during the day, but at night it's extremely weak and seems to be interfered with by another station. Maybe KLBP has to reduce their power at night. I don't know. Nobody mentioned propagation. It's probably day/night changes in the atmosphere that are making the main difference in reception. A station fairly close that you recieve ok in the day can be less strong at night. Also strong stations far away that you would never hear during the day can come in really strong at night due to bouncing. A directional antenna may help some, but there is no guarantee that you can solve your reception problem. Article: 97597 of rec.radio.amateur.homebrew From: David Subject: Re: Matching to Crystal Filter References: <1149479064.193604.313210@g10g2000cwb.googlegroups.com> Message-ID: <6DOgg.3511$ap3.1380@news-server.bigpond.net.au> Date: Mon, 05 Jun 2006 04:42:42 GMT Andy, Thanks for the information. So my matching circuit may look like.... Mixer Out(1k5) -> Series coupling cap(1n) -> Var L to ground -> C-Tap across L -> Crystal Filter -> C-Tap -> var L across C-Tap -> Coupling C(1n) -> SA605 Input (4500//3.5 pF) C-Tap caps to ground are also tuneable. I suppose the Q of the match would not need to be particularly high as the selectivity is provided by the Crystal filter. Regards David Andy wrote: > David wrote: >> Hi, >> >> I am wanting to match the output of a SA602 Mixer to a 45MHz, 4-pole >> crystal filter and then match the output of the filter to the input >> of a SA605 IF receiver. >> >> The filter datasheet specifies the termination impedance of 800 Ohms and >> 3pF. >> >> I have not used crystal filters before and would appreciate some advice >> for typology of a suitable match. >> >> The SA605 has a input impedance of 4500 Ohms par 3.5pF. Apparently they >> have a "sweet spot" if matched to 800R. >> The SA602 has output impedance of 1500 Ohm (not sure of capacitance). >> >> From what I can see, if I placed a 1k resistor across the SA605 input, >> this would give me close to 800R//3pF but not max. transfer of signal. >> >> Some of the confusion I have is what to do with the 3pF termination >> requirement. I am not sure if this means that I could match the >> resistive components using an "L" or "Tapped C match" and then add >> another 3pF to each side of the filter ??? >> >> >> Any help much appreciated >> >> Regards >> >> David > > > Andy writes: > > You've generally got it right.... > A xtal filter wants to see a particular input SOURCE resistance and > a particular LOAD resistance to develop the passband it was designed > for.... > > If your source has an output impedance of 4500 ohms, you would > want to transform it down to the 800 ohms specified. This can be > done in a transformer, but I usually do it with a split capacitor tank > circuit..... making the inductor the tuneable part. > > If the load wants to "see" a capacitance, I usually use a 2-20pf > trimmer , together with whatever else impedance transformation > is available. Then I can tune the variable cap for the desired > passband characterists... Note that both the input and the output > are tuned in my technique.... > > If you don't have a sweep generator, you can just sweep the > gen you have back and forth to see if there are any ripples in > the passband.... Optimum is generally with the minimum ripples... > So, first tune the input and output for max output... Then rock > the generator to check for ripples... Often a very small adjustment > in the tuning will minimize the ripples at that point... > > It ain't rocket surgery, but if you try to use fixed components > it ain't gonna happen, since you don't know your circuit strays.... > > Andy W4OAH > Article: 97598 of rec.radio.amateur.homebrew Message-ID: <4483B784.56787D3D@earthlink.net> From: "Michael A. Terrell" Subject: Re: 2SC2397 Datasheet ? References: <1149332944.772826.5820@h76g2000cwa.googlegroups.com> <4483017D.F4D63FC9@pcbdude.org> <4483A66E.17CD2FC5@earthlink.net> Date: Mon, 05 Jun 2006 04:48:44 GMT Jamie wrote: > > Michael A. Terrell wrote: > > > Jamie wrote: > > > >>(HIT) NPN 60V 8A TRANSISTOR T0-220 > >>Vcbo = 60v > >>Vbeo = 5 v > >>Pc = 25w/ > >>etc.. > >>etc.. > >> looks like a generic 2n3055 type.. > > > > > > > > Really? What are you going to do with the other 90 watts? The TO-3 > > version is rated at 115 watts It isn't even close. Even the plastic > > version is 90 watts > > > what to do with the remaining watts? i don't see your > point? That's about what I expected. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida Article: 97599 of rec.radio.amateur.homebrew Subject: Re: Identifying Surplus Toroid Material From: Mike Monett References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> Message-ID: Date: Mon, 05 Jun 2006 02:58:58 -0400 Alan Peake wrote: > Steve, the usual reason for the apparent low Q is that it is not being > measured at the frequency that will give highest Q. Try fewer turns and > higher frequencies as a first attempt. I've measured many cores this > way. If you like, I can email you an XL spreadsheet with the all the > cores I've measured so far. Switchmode cores seems to have > permeabilities quite a bit higher than 600. > Alan > VK2ADB Alan, are the ferrite toroids used to filter the output of pc power supplies or the ac input of microwave ovens useful for other applications? Or is the ferrite material lossy like the small ferrite beads used for emi reduction on wires? Regards, Mike Monett Article: 97600 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: Diff between xtal with 3 leads vs. 2 leads? Message-ID: References: <1149356781.814929.313650@i40g2000cwc.googlegroups.com> <1149483117.438265.297750@g10g2000cwb.googlegroups.com> Date: Mon, 05 Jun 2006 12:37:54 GMT On 4 Jun 2006 21:51:57 -0700, "C" wrote: >Allison, > >You might be misunderstanding. I'm modifying a Midland 13-380 to >transmit in the 10 meter band for use as a CW beacon. The xtal is >9.4MHz to replace the transmit xtal per instructions here: >http://www.4sqrp.com/resource/10m_beacon/10m_beacon.htm Seems I do understand but you still didn't answer the question. OK, that is a CB radio (USA 11M AM flavor). Likely that is a crystal of the three legged variety wher one leg is a case ground or anchor. However I have a RS40ch radio in my parts bin where the 10.695mhz three legged thing is a crystal filter! >Should put the freq up in the 10M beacon portion of the band if I can >hook up the 3 leads correctly and if it is indeed a proper application >for the part. The question was is it a crystal or a crystal filter? As both come packaged that way. At 9.4mhz it's likely a crystal. If so the middle (case ground) is optional. I don't happen to have the 13-380 schematic but I can make a general set of comments: ANY CB radio with a 10.240 mhz crystal and an IC near it has a PLL for frequency control and conversion 10M is not as simple as just changing the 10.240 rock. The reasonis the 10.240 is not direcly the TX or RX "rock" but the reference for the PLL. CB radios come on three basic flavors. Cheap and old, used a crystal per channel and were often limited to 3 to 12 channels. OLD 23 channel that used usually combination of 37.x, 10.1xx and 10.5xx (or 23 and 14mhz) crystals to get RX and TX by mixing the result. Newer (very late 23ch and ALL 40ch) used PLL system with 10.240 as reference and PLL chip like 858, 5807, 14506 and maybe a dozen other part numbers. Those are the most challenging. Old and cheap crystal per channel just reqires a rock of the correct type and frequency and some retuning. Old 23ch required picking a pair of rocks or atlest one to get the mixed pair to be 10M and then retuning the whole synth and TX chain. Often changing the rocks from 37.6 and 10.595 (27.005 CB ch 4) to a 37.6 and 9.56 (for 28.040) means the 10.5mhz osc needs to be retuned and the tx bandpass filter retuned from 27mhz to 28 before the unit will transmit at all. If the 37.x osc crystal is changed that will also have the same effect as then that osc needs retuning and the band pass filter as well. The newer PLL based radios are a whole different story and there are three different topologies for getting the TX frequency. Some are easier than others. Some will not go without a fight. In any case schematic for the radio and some understanding of how the PLL for that radio works is needed to get a result that works. FYI: the PLL based designs have a TX lockout circuit if the PLL is out of lock or misprogrammed. We can discuss off line at kb1gmx at arrl dot net. Allison Article: 97601 of rec.radio.amateur.homebrew From: "Rob Mills" References: <1149386257.083333.63900@i39g2000cwa.googlegroups.com> Subject: Re: Coil stock Message-ID: Date: Mon, 5 Jun 2006 11:15:08 -0500 "mrhaney" wrote in message news:1149386257.083333.63900@i39g2000cwa.googlegroups.com... >>I am in need of some B&W coil stock...B&W # 1032T .. It is 24 ga. wire 1 1/4 " dia. 32 turns per inch . also B&W 3020 <<< www.surplussales.com/Inductors/Ind-B-WCoilStock.html Article: 97602 of rec.radio.amateur.homebrew From: "doug" References: <9qj48258c57g4hodup6aavgd79rsvq5mi2@4ax.com> <9du682tk4i5hjb80lrug93ikdruskiqi8f@4ax.com> Subject: Re: need: smd transistor Message-ID: <7E3hg.13186$rC1.3897@newsfe4-gui.ntli.net> Date: Tue, 06 Jun 2006 00:04:19 GMT wrote in message news:9du682tk4i5hjb80lrug93ikdruskiqi8f@4ax.com... > On Sun, 04 Jun 2006 22:32:52 GMT, "doug" > wrote: > > > > > wrote in message > >news:9qj48258c57g4hodup6aavgd79rsvq5mi2@4ax.com... > >> On Sun, 04 Jun 2006 01:28:10 GMT, "doug" > >> wrote: > >> > >> >Hi all, am looking for source in UK for Sony dual gate n channel surface > >> >mount transistors type SGM 2016M to repair yaesu ft8000 radio. have > >checked > >> >online parts lists for the usual firms in uk,with no luck! want three > >off, > >> >or does anyone know of equivalent type? thanks for any help. doug. > >> > > >> > >> No but likely that part number is a inhouse designation. One way to > >> cheat the whole mess is look up a SMT DG fet sourced from Sony > >> as I bet there only a few parts to pick from. Alternate is Phillips > >> also does SMT DG fets and likely they would work. > >> > >> Allison > > > > > >thanks for reply Allison, will check for Phillips equivalent. doug. > > > You may have to replace by inference(similar specs or function) rather > than direct part number match. > > Allison yes,that had occurred to me too. thanks for help Allison doug. Article: 97603 of rec.radio.amateur.homebrew From: Allodoxaphobia Subject: Re: Matching to Crystal Filter Date: 6 Jun 2006 01:34:30 GMT Message-ID: References: <1149479064.193604.313210@g10g2000cwb.googlegroups.com> <6DOgg.3511$ap3.1380@news-server.bigpond.net.au> <1149555185.183482.145350@i40g2000cwc.googlegroups.com> On 5 Jun 2006 17:53:05 -0700, Andy wrote: > <-snip-> > This comes from the equvalency formulae for series to parallel > comversion: > > 2 2 > 2 > Rp = Rs ( Q + 1 ) Xp = Xs ( Q + 1) / Q Before you try posting something like that again, you should make sure you are using a fixed-pitch font. It probably is indecipherable to anyone except someone using the exact same proportional spaced font _and_ font size as you when you banged so many times on the space bar. Jonesy Article: 97604 of rec.radio.amateur.homebrew From: David Subject: Re: Matching to Crystal Filter References: <1149479064.193604.313210@g10g2000cwb.googlegroups.com> <6DOgg.3511$ap3.1380@news-server.bigpond.net.au> <1149555185.183482.145350@i40g2000cwc.googlegroups.com> Message-ID: <0N5hg.4093$ap3.1712@news-server.bigpond.net.au> Date: Tue, 06 Jun 2006 02:30:20 GMT Andy, Thanks. I am using single-ended output from the SA602 as well as for the SA605 input. I decouple the unused output/input with 100n Cap in each case. How do you know the match is working correctly ? My concern is that when I build the circuit and sweep it with a sig gen and tune it for peak, how do I know the match to is correct in the first place. Regards David Andy wrote: > David wrote: >> Andy, >> >> Thanks for the information. So my matching circuit may look like.... >> >> Mixer Out(1k5) -> Series coupling cap(1n) -> Var L to ground -> C-Tap >> across L -> Crystal Filter -> C-Tap -> var L across C-Tap -> Coupling >> C(1n) -> SA605 Input (4500//3.5 pF) >> >> C-Tap caps to ground are also tuneable. >> >> I suppose the Q of the match would not need to be particularly high as >> the selectivity is provided by the Crystal filter. >> >> Regards >> >> David >> > > Andy writes: > > There is a formula for the required Q to perform the match. > > Qreq'd = Square Root of ( (Rhigh/Rlow ) - 1 ) > > > 1500 > or Sqrt of ( ------------ - 1 ) > 800 > > It's been a while so, if I got this wrong, I am sure some of the > local RF engineers will correct me... > > Anyway,,, this is the minimum Q required in the tank to allow the > match > to be accomplished.... > > This comes from the equvalency formulae for series to parallel > comversion: > > > 2 2 > 2 > Rp = Rs ( Q + 1 ) Xp = Xs ( Q + 1) / Q > > for coverting parallel resistance or reactance into equivalent > series resistance or reactance..... > > Sure you can use Z and Y, but the above are much much easier..... > > > I can't follow your diagram very well, but I think you have it.... > ... I am assuming SINGLE ENDED OUTPUT. For balanced > output, it is different... > > Andy W4OAH > Article: 97605 of rec.radio.amateur.homebrew From: **THE-RFI-EMI-GUY** Subject: Re: Dissipating High RF Power in Vacuums References: <1149524634.387224.292710@g10g2000cwb.googlegroups.com> Message-ID: Date: Tue, 06 Jun 2006 03:29:33 GMT Heat pipes? Carbon absorbers? Crash test dummies? Bobby wrote: >All, >What methods are commonly used to dissipate high RF power in vacuum >chambers, apart from conduction cooled plates? > >Any response is welcomed. > >Thanks. > >Bobby. > > > -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P Article: 97606 of rec.radio.amateur.homebrew From: Alan Peake Subject: Re: Identifying Surplus Toroid Material Date: Tue, 06 Jun 2006 18:14:56 +1000 Message-ID: <44853980.1010105@killspam.internode.on.net> References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> > Alan, are the ferrite toroids used to filter the output of pc power > supplies or the ac input of microwave ovens useful for other applications? > The PC PSU filter toroids seem to be optimized for the 25KHz -85KHz range so any applications you have for this frequency range could use them. Similarly, the AC input to the oven is probably 50/60HZ so those toroids would be better at the lower audio frequencies. > Or is the ferrite material lossy like the small ferrite beads used for emi > reduction on wires? > Not quite sure about beads - ordinary ferrite material has fairly constant permeability up to a frequency determined by the ferrite mix, then drops off. Beads tend to have an impedance peak at some desired frequency range - e.g. 100-200MHz Alan Article: 97607 of rec.radio.amateur.homebrew Subject: Re: Identifying Surplus Toroid Material From: Mike Monett References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> <44853980.1010105@killspam.internode.on.net> Message-ID: Date: Tue, 06 Jun 2006 04:31:26 -0400 Alan Peake wrote: > The PC PSU filter toroids seem to be optimized for the 25KHz -85KHz > range so any applications you have for this frequency range could use > them. Similarly, the AC input to the oven is probably 50/60HZ so those > toroids would be better at the lower audio frequencies. > > Not quite sure about beads - ordinary ferrite material has fairly > constant permeability up to a frequency determined by the ferrite mix, > then drops off. Beads tend to have an impedance peak at some desired > frequency range - e.g. 100-200MHz > Alan Thanks very much - that encourages me to try them and see how well they perform. Regards, Mike Monett Article: 97608 of rec.radio.amateur.homebrew From: "AAA RF Products" Subject: FS: High Quality Coax Connectors & Adapters atvery low prices Message-ID: Date: Tue, 6 Jun 2006 09:43:59 -0700 Please email sales@aaarfproducts.com or call 949 481 3154 (San Clemente, CA, USA) for a copy of our latest catalog. Article: 97609 of rec.radio.amateur.homebrew From: "Travis Jordan" References: Subject: Re: High Quality Coax Connectors & Adapters atvery low prices Message-ID: Date: Tue, 06 Jun 2006 16:50:14 GMT AAA RF Products wrote: > Please email sales@aaarfproducts.com or call 949 481 3154 (San > Clemente, CA, USA) for a copy of our latest catalog. Please stop spamming these newsgroups. Article: 97610 of rec.radio.amateur.homebrew From: "Jimbo" Subject: Re: High Quality Coax Connectors & Adapters atvery low prices Date: Tue, 6 Jun 2006 12:46:17 -0500 Message-ID: References: <1149614234.717200.192860@u72g2000cwu.googlegroups.com> "an_old_faggot" then stop your dumb shit,mork! Article: 97611 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: Dissipating High RF Power in Vacuums Date: Tue, 06 Jun 2006 14:09:15 -0400 Message-ID: References: <1149524634.387224.292710@g10g2000cwb.googlegroups.com> > Bobby wrote: > > >All, > >What methods are commonly used to dissipate high RF power in vacuum > >chambers, apart from conduction cooled plates? Bobby- The only remaining option is radiation. Fred Article: 97612 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Identifying Surplus Toroid Material Date: Tue, 06 Jun 2006 11:31:51 -0700 Message-ID: <128bigq9gr415d4@corp.supernews.com> References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> <44853980.1010105@killspam.internode.on.net> <98GdnbXiy_p29hjZnZ2dnUVZ8qqdnZ2d@pipex.net> <-JqdnTLcL5XQWBjZRVnyjQ@bt.com> Reg Edwards wrote: >> Reg Edwards wrote: >>> Ferrites have as many vices as they have virtues. >>> >>> Ferrite salesmen cleverly make virtues out of vices. >> ================================================ >> But an electronics 'homebrewer' can find out characteristics anyway > , >> through experimentation. >> >> Frank GM0CSZ / KN6WH > ==================================== > > Only if he has first-class laboratory facilities. > > And samples vary widely in their characteristics, one from another. > > The best way of using one is to wind some wire on it. If it works in > your particular circuit then consider yourself lucky. It's not nearly as bad as Reg says, and a surprising response from someone who measures ground conductivity to great depths in a kitchen sink. An antenna analyzer hardly qualifies as "first-class laboratory facilities", yet it can quickly show you the impedance and Q of an inductor wound on a core at any frequency within its range. If saturation with DC is a problem, the impedance can be measured while DC is passed through another winding from a source having a high impedance at RF. And samples of cores are typically alike in basic characteristics within a few percent. Ferrites are more commonly used at RF for wideband transformers and EMI suppression than for high-Q inductors. In those applications, minimum impedance magnitude is usually the criterion rather than Q or having a precise value. So even a rough approximation of impedance is usually all that's required. The magnitude of impedance can be measured with a variety of simple means in addition to an antenna analyzer. Only in those applications where a high Q inductor is required, usually at low frequencies, are better measurements required. Roy Lewallen, W7EL Article: 97613 of rec.radio.amateur.homebrew From: "Steve N." Subject: Re: Dissipating High RF Power in Vacuums Date: Tue, 6 Jun 2006 13:40:09 -0500 Message-ID: References: <1149524634.387224.292710@g10g2000cwb.googlegroups.com> "Fred McKenzie" wrote in message news:fmmck-0606061409150001@ac949ecc.ipt.aol.com... > > Bobby wrote: > > > > >All, > > >What methods are commonly used to dissipate high RF power in vacuum > > >chambers, apart from conduction cooled plates? > > Bobby- > > The only remaining option is radiation. > > Fred Don't know what's common. Since it is a *chamber* you could "pipe" it out of the chamber. Perhaps a water cooled jacket to a radiator on the outside, or Peltier or heat pipe to a chamber wall. 73, Steve, K9DCi From JT Tue Jun 6 22:41:15 EDT 2006 Article: 97614 of rec.radio.amateur.homebrew From: JT (jt@trek.net) Newsgroups: rec.radio.amateur.homebrew Subject: Re: CB president jackson for 10 m ham band X-Newsreader: NewsLeecher v3.0 Final (http://www.newsleecher.com) References: <1149622867.533922.60990@i40g2000cwc.googlegroups.com> Lines: 9 Message-ID: X-Complaints-To: abuse@usenetserver.com X-Abuse-Info: Please be sure to forward a copy of ALL headers X-Abuse-Info: Otherwise we will be unable to process your complaint properly. NNTP-Posting-Date: Tue, 06 Jun 2006 16:27:18 EDT Date: Tue, 06 Jun 2006 20:27:18 GMT Path: news.unc.edu!canoe.uoregon.edu!newshub.sdsu.edu!nx01.iad01.newshosting.com!newshosting.com!208.49.83.146.MISMATCH!atl-c08.usenetserver.com!news.usenetserver.com!pc02.usenetserver.com!fe13.usenetserver.com.POSTED!334b1f4d!not-for-mail Xref: news0.isis.unc.edu rec.radio.amateur.homebrew:97614 I've done one maybe 20 years ago I changed the 10.240 crystal then had to re adjust all the tank coils will not work on 11 meters when your done. -- ---------------------------------------------- Posted with NewsLeecher v3.0 Final * Binary Usenet Leeching Made Easy * http://www.newsleecher.com/?usenet ---------------------------------------------- Article: 97615 of rec.radio.amateur.homebrew From: Chris Jones Subject: Re: Wireless World & Radio Engineering magazines Date: Tue, 06 Jun 2006 23:47:11 +0100 Message-ID: <128btt7d0j4joa3@corp.supernews.com> References: <447FA5B8.4ED9C96F@edge.net> Bob G. Mahrenholz wrote: > Hi' > I'm needing a copy of articles on bandpass filtering using negative > mutual coupling > (a la J.W. Miller) in the February 18, 1931 issue of Wireless World and > in the December, 1936 issue of Radio Engineering magazine. Will pay a > reward. > > Thanks, > Bob > bobm@edge.net Perhaps you can buy it from these people: http://www.kellybooks.co.uk/5-Mag-Tech-WW.htm I have never dealt with them so I don't know what kind of people they are. Chris Article: 97616 of rec.radio.amateur.homebrew From: Yukio YANO Subject: Re: CB president jackson for 10 m ham band References: <1149622867.533922.60990@i40g2000cwc.googlegroups.com> Message-ID: Date: Tue, 06 Jun 2006 23:19:41 GMT iw3arv wrote: > Hello, > > I'm searching a modification for the CB President Jackson to bring it > up to 30 Mhz. > I've searched on internet but I've only found simple modification to > add "F" band and reach 271 channels. > I'm a regularly licenced Ham!! and I want to use it on 30 Mhz. > > Anyone know other modifications. > > Thanks de Iw3arv Paolo Italy > Google "CB President Jackson" I found some interesting sites The Dumb thing is Learning to ask the RIGHT Question. Yukio YANO VE5YS Article: 97617 of rec.radio.amateur.homebrew From: David Subject: Re: Matching to Crystal Filter References: <1149479064.193604.313210@g10g2000cwb.googlegroups.com> <6DOgg.3511$ap3.1380@news-server.bigpond.net.au> <1149555185.183482.145350@i40g2000cwc.googlegroups.com> <0N5hg.4093$ap3.1712@news-server.bigpond.net.au> <1149589731.458222.322640@c74g2000cwc.googlegroups.com> <1149590567.761761.284670@y43g2000cwc.googlegroups.com> Message-ID: <8nohg.4561$ap3.1940@news-server.bigpond.net.au> Date: Tue, 06 Jun 2006 23:39:48 GMT Andy, Thanks for the link. Regards David Andy wrote: > Andy write: > > I found an App note on the web that will > show you how to use it. > > > http://www.ece.utah.edu/~cfurse/microwave/LECTURE/L15/L15.html > > You can probly find more by doing a google search on : > > " Rp Impedance Matching " >