Article: 96559 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: WWV receiver Date: Mon, 6 Feb 2006 18:56:32 -0800 Message-ID: <11ug36c5pbsq891@corp.supernews.com> References: <1138790354.679710.114420@g44g2000cwa.googlegroups.com> "xpyttl" wrote in message news:bqoFf.6$LI6.3@fe06.lga... > Huh? Yes, he is well into RF and construction techniques will be different. > But while there are advantages to air-coil cores, their use in recievers > went out with hollow state detectors. I think that Coilcraft, API-Delavan, Pulse, etc. would be surprised to hear them. Although I'd grant you that you don't typically find many air coils in mass-market consumer electronics anymore, they're still used all over the place in industrial and military design... where I work we buy tens of thousands of the things every year for radio receivers! Plenty of articles appearing in QEX and on-line also use air-core coils, since it's a pretty fast and you can, of course, get whatever value you want with no "minimum purchase" quantities. ---Joel Kolstad Article: 96560 of rec.radio.amateur.homebrew From: Joerg Subject: Re: WWV receiver References: <1138790354.679710.114420@g44g2000cwa.googlegroups.com> Message-ID: Date: Tue, 07 Feb 2006 09:03:07 GMT xpyttl wrote: > >>Not just that. The transmitted code is also different. > > He wants to listen, and at least at 10 MHz there's something to listen TO. > The 60Khz signal is pretty strange. > Tobin wrote "... easier to decode". So I guess he is after decoding and not so much after listening. Regards, Joerg http://www.analogconsultants.com Article: 96561 of rec.radio.amateur.homebrew From: Joerg Subject: Re: WWV receiver References: <1138790354.679710.114420@g44g2000cwa.googlegroups.com> <11ug36c5pbsq891@corp.supernews.com> Message-ID: Date: Tue, 07 Feb 2006 09:08:25 GMT Hello Joel, > > I think that Coilcraft, API-Delavan, Pulse, etc. would be surprised to hear > them. Although I'd grant you that you don't typically find many air coils in > mass-market consumer electronics anymore, they're still used all over the > place in industrial and military design... where I work we buy tens of > thousands of the things every year for radio receivers! > To imitate an old Volkswagen ad: Air doesn't saturate. Well, I guess it does at some point but that's way past where ferrites and iron powders do. Today many inductors in receivers are designed around iron powder cores but when it comes to heavy-duty stuff air cores are the ticket. Same for really high-Q tuning circuits. Regards, Joerg http://www.analogconsultants.com Article: 96563 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: Charger for field day lead acid batteries ? Date: Tue, 07 Feb 2006 20:21:12 -0000 Message-ID: <11ui09obsrgc08@corp.supernews.com> References: <1139339521.853220.235180@g44g2000cwa.googlegroups.com> In article <1139339521.853220.235180@g44g2000cwa.googlegroups.com>, tucker@conninc.com wrote: >Need to charge some SLAs and other lead acid batteries for field day Im >trying to make >something work without buying a new battery charger, so here goes. > I need to charge a alot of different voltage lead acid batterys >6,8,10,12, ect. I have a >old charger that only puts out 12-14vdc, I have a 10amp 120vac >powerstat (variac) im thinking >of adding to the input of the transformer to reduce output . Will this >work? > Im not sure about the inductance & operating a transformer @ 1/2 or >2/3 the normal 120 vac >input voltage, im wandering if this will effect efficiency or if it >will work at all. The transformer in your existing charger will probably function as you expect if you reduce its input voltage with a Variac. However, there's no assurance at all that your charger's DC output voltage will behave. If the charger has a linear voltage regulator of some sort inside, the regulator's not going to want to track the reduced input voltage. It'll probably run "wide open", which means that the charger's output voltage is going to be very critically dependent on the Variac setting. Unless you are very careful in setting the Variac, you'll either undercharge the battery, or hit it with too high a voltage and end up gassing away much of the electrolyte. You might be able to alter the DC regulation circuitry in the charger, so that it would regulate down to a lower (switch-selectable) voltage. You might need to do both in order to charge a lower-voltage battery without overheating the charger - reduce the input AC voltage by about half (to cut the raw, unregulated DC voltage) and then change the voltage-regulator setting to produce the correct fast-charge or float-charge voltage. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! Article: 96564 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Crystals Date: Tue, 7 Feb 2006 15:03:45 -0600 Message-ID: References: <1139247813.245486.129660@z14g2000cwz.googlegroups.com> "mrhaney" wrote in message news:1139247813.245486.129660@z14g2000cwz.googlegroups.com... > I have about 60 military crystals ..they are marked Channel 277 thru CH > 347 .Anyone know if they are overtone ,and, know of a good way to > check them.. My grid dipper will not oscillate with them like it does > with basic fundamental crystals ,like 7193 KHZ. etc..THEY ARE FOR > SALE TOO..W4PQW > Mr. Haney, All crystals will operate on their fundamental as well as the overtone modes. Too bad they aren't working in your g-dipper. What holder are they in? Is it the old standard FT 243 (if I recall the number correctly). Channel numbers could be for anything. A simple Colpitts osc could be built to see where the fundamental is. Use the SECOND circuit here: http://hem.passagen.se/communication/txo.html Use both 150 Pf. The total of C3 and VC1 can be around 50-100 pf and it should oscillate so you can measure / count the freq. R3 = 2.2K should get it going. 73, Steve, K9DCI Article: 96565 of rec.radio.amateur.homebrew From: "john graesser" Subject: Re: Charger for field day lead acid batteries ? Date: Tue, 7 Feb 2006 15:56:18 -0600 Message-ID: <11ui5e0an83qaec@corp.supernews.com> References: <1139339521.853220.235180@g44g2000cwa.googlegroups.com> wrote in message news:1139339521.853220.235180@g44g2000cwa.googlegroups.com... > Need to charge some SLAs and other lead acid batteries for field day Im > trying to make > something work without buying a new battery charger, so here goes. > I need to charge a alot of different voltage lead acid batterys > 6,8,10,12, ect. I have a > old charger that only puts out 12-14vdc, I have a 10amp 120vac > powerstat (variac) im thinking > of adding to the input of the transformer to reduce output . Will this > work? > Im not sure about the inductance & operating a transformer @ 1/2 or > 2/3 the normal 120 vac > input voltage, im wandering if this will effect efficiency or if it > will work at all. To get battery credit, didn't the batteries need to be charged by something other than power line current? I thought they had to be solar, wind, water etc charged so that you couldn't just plug in a battery charger into a wall and charge them the easy way. Not to put a damper on your using batteries for field day, but you might want to check the rules. Here we use a big diesel generator for the radios, but some wanted their logging laptops plugged into the wall instead of the generator and a spirited argument broke out whether that negated the credit for not using lines power. thanks, John. KC5DWD Article: 96566 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Charger for field day lead acid batteries ? Date: Tue, 7 Feb 2006 18:03:17 -0600 Message-ID: References: <1139339521.853220.235180@g44g2000cwa.googlegroups.com> SLAs will be Tricky. If the supply you have is regulated, the variac is not a very good idea. The transformer operation and efficiency is not an issue. It will work just fine on the variac. However, you really need a well regulated supply and accurate voltmeter and to float them for full charge. I have two little SLAs sitting at 13.75 all the time. Read the lead-Acid sections of this first, then decide. http://www.batteryuniversity.com/partone.htm Having a good background in Lead-Acid basics, you can do some things, one being: For one battery at a time: 1- Measure voltage at start to determine charge state. 2- Calculate amp-hours to full charge (knowing the charge replacement efficiency of YOUR battery). 3- Charge with known current (like a ni-cad charger) to somewhere under 90%. 4- Measure the open ckt voltage periodically, but after the required rest period. 5- Stop before disaster happens. OR Just wing it. (:-) 73, Steve, K9DCI Just kidding with the wing it thing. wrote in message news:1139339521.853220.235180@g44g2000cwa.googlegroups.com... > Need to charge some SLAs and other lead acid batteries for field day Im > trying to make > something work without buying a new battery charger, so here goes. > I need to charge a alot of different voltage lead acid batterys > 6,8,10,12, ect. I have a > old charger that only puts out 12-14vdc, I have a 10amp 120vac > powerstat (variac) im thinking > of adding to the input of the transformer to reduce output . Will this > work? > Im not sure about the inductance & operating a transformer @ 1/2 or > 2/3 the normal 120 vac > input voltage, im wandering if this will effect efficiency or if it > will work at all. > Article: 96567 of rec.radio.amateur.homebrew Message-ID: <43E94359.8040308@nettally.com> From: **THE-RFI-EMI-GUY** Subject: Re: Crystals References: Date: Wed, 08 Feb 2006 01:03:19 GMT Don't you mean KHz?? Henry wrote: > If the crystals are the old WW2 crystals that are about an inch > square, the frequency is determined as follows: > > If the Channel is a 2 digit number, divide the marked frequency by 54 > to obtain the fundamental frequency: > > Channel 32 > Marked Frequency 32.2 Mc > Fundamental Frequency 32.2/54 = 429.630 MHz > > If the Channel is a 3 digit number, divide the marked frequency by 72 > to obtain the fundamental frequency: > > Chhannel 381 > Marked Frequency 38.1 Mc > Fundamental Frequency 38.1/72 = 529.166 MHz > > Hope this helps and 73, > > Henry WA0GOZ -- 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: 96568 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: Subject: Re: Crystals Message-ID: Date: Wed, 08 Feb 2006 01:31:50 GMT "Henry" wrote in message news:N4Odnd8o99Lu3HTenZ2dnUVZ_tydnZ2d@comcast.com... > If the crystals are the old WW2 crystals that are about an inch square, > the frequency is determined as follows: > > If the Channel is a 2 digit number, divide the marked frequency by 54 to > obtain the fundamental frequency: > > Channel 32 > Marked Frequency 32.2 Mc > Fundamental Frequency 32.2/54 = 429.630 MHz > > If the Channel is a 3 digit number, divide the marked frequency by 72 to > obtain the fundamental frequency: > > Chhannel 381 > Marked Frequency 38.1 Mc > Fundamental Frequency 38.1/72 = 529.166 MHz > > Hope this helps and 73, > > Henry WA0GOZ It would help more if you separated your MHz from KHz. Those are all WW2 tank transmitter frequencies and were for 54 X and 72 X multiplications so that it could be FM'd. The Army must have loved old Armstrong, they always used FM even when the well understood capture effect kept killing off their guys. Same reason the Air Force still can't talk to the ground pounder unless they stick an AF guy with an AM rig with them on the ground. Sigh W4ZCB Article: 96569 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: Subject: Re: Crystals Message-ID: <0_dGf.783420$xm3.74105@attbi_s21> Date: Wed, 08 Feb 2006 03:56:44 GMT >>Same reason the Air Force still can't talk to the ground pounder >>unless they stick an AF guy with an AM rig with them on the ground. Sigh > > Nah. We had a surplus outfit here in Tucson that cut up old Air Force > planes at DMAFB (The Boneyard). > > I bought a Collins KWM-1 from them that came out of a B-47. They were > using SSB a long time ago. I wish I had kept that radio as it might > have been very widely traveled. Yes Wes, and SSB IS AM. If you were an Old Crow, you still are. By any chance know Duke Knief? Was out to Davis Monthan last year, all those single flight C-141's was sickening. From the factory to the boneyard just to protect some congressmans turf. W4ZCB Article: 96570 of rec.radio.amateur.homebrew From: Donna Ferentes Subject: Re: ?Interested? Start here with the weekly FAQ! Date: Wed, 08 Feb 2006 08:11:10 +0000 Message-ID: <0o9ju1lib4dnn1o90dujuvks52i3lc8oec@4ax.com> References: <1138999705.826148.261240@g43g2000cwa.googlegroups.com> <1139040344.670488.20930@o13g2000cwo.googlegroups.com> <1139041177.269936.259450@f14g2000cwb.googlegroups.com> <76v9u1lls0nmv9ogaclri6ti2i52m9c70b@4ax.com> Nedlar wrote: >On Sun, 05 Feb 2006 16:22:52 +0000, Nedlar wrote: > >>On Sun, 05 Feb 2006 00:12:44 +0000, Donna Ferentes >> wrote: >> >>> >>>A Google search shows that the original posting wasn't made by >>>'spike'. >>> >>>HTH >>> >>>Donna >> >>'Spike' originally trotted out his bile under the 'RVMJ' label. He has >>also used an anagram of an RSGB board members call sign. >>Learn to use Google correctly before spouting such rubbish. If you use Google better: "The cause of the crackly noise (on rechecking everything) was found to be a double-fault on the mixer capacitor rotor-plate earthing contacts." There is more, you will find it if you look. >>Stupid bugger. Are you a bugger? You look stupid. >Sorry to respond to my own posting but I actually meant to say ' RSGB >board members name' >I stand by for the usual response from the brain-dead CBrs, M3s and >other pedantic dross. You fall over yourself. Donna Article: 96571 of rec.radio.amateur.homebrew From: Allison-nospam@nouce.bellatlantic.net Subject: Re: Charger for field day lead acid batteries ? Message-ID: <24sju11kuq0ijk5vbor0608gi9qp2o4crc@4ax.com> References: <1139339521.853220.235180@g44g2000cwa.googlegroups.com> <11ui5e0an83qaec@corp.supernews.com> Date: Wed, 08 Feb 2006 13:38:56 GMT On Tue, 7 Feb 2006 15:56:18 -0600, "john graesser" wrote: > > wrote in message >news:1139339521.853220.235180@g44g2000cwa.googlegroups.com... >> Need to charge some SLAs and other lead acid batteries for field day Im >> trying to make >> something work without buying a new battery charger, so here goes. >> I need to charge a alot of different voltage lead acid batterys >> 6,8,10,12, ect. I have a >> old charger that only puts out 12-14vdc, I have a 10amp 120vac >> powerstat (variac) im thinking >> of adding to the input of the transformer to reduce output . Will this >> work? >> Im not sure about the inductance & operating a transformer @ 1/2 or >> 2/3 the normal 120 vac >> input voltage, im wandering if this will effect efficiency or if it >> will work at all. > >To get battery credit, didn't the batteries need to be charged by something >other than power line current? I thought they had to be solar, wind, water >etc charged so that you couldn't just plug in a battery charger into a wall >and charge them the easy way. >Not to put a damper on your using batteries for field day, but you might >want to check the rules. Here we use a big diesel generator for the radios, >but some wanted their logging laptops plugged into the wall instead of the >generator and a spirited argument broke out whether that negated the credit >for not using lines power. >thanks, John. >KC5DWD > There are two different multipliers at work. If it's battery then how they were charged is unimportant. All that counts is your running on battery. If you charge them while on the air then how you charge them counts. If off generator its differnt than off the mains. There is a special class if you charge them using neither generator(gas/diesel power) or mains for that see alternative power. If your going for the alternative power source multiplier then how the batteries are charged counts. I think the rule says non-petropower (gas oil or pertro byproducts) IE: Solar, unless you have a really big solar array it's diffictult to run a radio directly from the sun (it's possible) but the rules do allow you to charge batteries from the sun and run from them. I believe you get both solar power and battery scores for that. Other sources are allowed such as water power, wind, someone peddling a genny, a old military handcrank gen would be valid examples. I was told steam powered genny running off wood or waste and a internal combustion engine running off a wood gassifier also qualifies. I suspect a diesel gen running of greasoline (used cooking grease or vegetable oil) may also qualify. Running aux equipment like fans, lights and computers(not connected to radios) do not negate the battery or alternate energy credit/nultipliers. Allison KB!gmx Article: 96572 of rec.radio.amateur.homebrew Date: Wed, 08 Feb 2006 21:41:50 +0800 From: Richard Hosking Subject: Re: SM Inductors As BP Circuit References: Message-ID: <43e9f51e$0$3659$5a62ac22@per-qv1-newsreader-01.iinet.net.au> I have done a 70 MHz LPF with SM inductors, though the physical spacing wasnt close. Performance agreed roughly with theoretical, though I must admit I did not test rigorously. Closer coupling will widen bandwidth/lower Q. You could use a small capacitor between parallel tuned sections as coupling, and capacitive dividers as impedance matching Richard Reg Edwards wrote: > A bandpass filter can be designed as two coupled L and C tuned > circuits. > > The two circuits are coupled together via the mutual inductance > between the two spaced-apart coils. As in a 455 KHz interstage > transformer in a screening can. > > The degree of coupling is approximately 1/Sqrt(Q1*Q2), where Q1 and Q2 > are the tuned-circuit Q's which are determined by the filter's > terminating resistances. > > Closer coupling increases the bandwidth. > > For details see Terman. > ---- > Reg. > > Article: 96573 of rec.radio.amateur.homebrew From: Nedlar Subject: Re: ?Interested? Start here with the weekly FAQ! Date: Wed, 08 Feb 2006 13:56:01 +0000 Message-ID: References: <1138999705.826148.261240@g43g2000cwa.googlegroups.com> <1139040344.670488.20930@o13g2000cwo.googlegroups.com> <1139041177.269936.259450@f14g2000cwb.googlegroups.com> <76v9u1lls0nmv9ogaclri6ti2i52m9c70b@4ax.com> <0o9ju1lib4dnn1o90dujuvks52i3lc8oec@4ax.com> On Wed, 08 Feb 2006 08:11:10 +0000, Donna Ferentes wrote: >If you use Google better: > >"The cause of the crackly noise (on rechecking everything) was found >to be a double-fault on the mixer capacitor rotor-plate earthing >contacts." > >There is more, you will find it if you look. I don't need to look. You originally said the quote was not made by Spike. I know it was. Nothing you have said has proven otherwise. > >Are you a bugger? You look stupid. But not nearly as stupid as you. >You fall over yourself. > >Donna I prefer accuracy. Pity that you don't. Article: 96574 of rec.radio.amateur.homebrew From: "John Brock" Subject: Re: HP8553B mixer diodes Date: Wed, 8 Feb 2006 16:35:23 +0200 Message-ID: References: The manual for the HP8553B is on bama.sbc.edu in pdf form. The diodes are nothing special but are matched. 73 John (ZS6BZF) Article: 96575 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Crystals Date: Wed, 8 Feb 2006 13:04:37 -0600 Message-ID: References: "Henry" wrote in message news:N4Odnd8o99Lu3HTenZ2dnUVZ_tydnZ2d@comcast.com... > If the crystals are the old WW2 crystals that are about an inch > square, the frequency is determined as follows: > > If the Channel is a 2 digit number, divide the marked frequency by 54 > to obtain the fundamental frequency: > > Channel 32 > Marked Frequency 32.2 Mc > Fundamental Frequency 32.2/54 = 429.630 MHz The new math??? Perhaps 596.296 Kc > > If the Channel is a 3 digit number, divide the marked frequency by 72 > to obtain the fundamental frequency: > > Chhannel 381 > Marked Frequency 38.1 Mc > Fundamental Frequency 38.1/72 = 529.166 MHz Ditto, but Kc 73, Steve, K9DCI > > Hope this helps and 73, > > Henry WA0GOZ Article: 96576 of rec.radio.amateur.homebrew Date: Thu, 09 Feb 2006 00:45:14 +0200 From: Risto Tiilikainen Subject: Re: Crystals References: <1139247813.245486.129660@z14g2000cwz.googlegroups.com> Message-ID: <43ea73bd$0$25359$39db0f71@news.song.fi> mrhaney wrote: >I have about 60 military crystals ..they are marked Channel 277 thru CH >347 .Anyone know if they are overtone ,and, know of a good way to >check them.. My grid dipper will not oscillate with them like it does >with basic fundamental crystals ,like 7193 KHZ. etc..THEY ARE FOR >SALE TOO..W4PQW > > > Hi ! You are raising nostagig memories. In 60 tales those FT241 xtals were used for home brew 455 kc xtal lattice filters for SSB transmitters and home brew receivers. Bought some 100 pcs of them from "Jan Xtals" surplus shop in USA. Oscillator circuit for those FT241 xtals was not so trivial as for ham band xtals (as you experience with your dipper) Used BC-221 to select individual xtals for lattice filters. You can check them by measuring series resonance. You can also make a simple J-fet oscillator Oh those surplus times A school boy had to consult a couple of hotel porters to change Finmarks to USD to buy surplus xtals from USA to make lattice filter to contruct SSB transmitter. 73 de Risto OH2BT Article: 96577 of rec.radio.amateur.homebrew From: "Mr Fed UP" References: Subject: Re: Heathkit Question Message-ID: Date: Thu, 9 Feb 2006 09:47:51 -0600 http://www.qsl.net/kb7rgg/heath/heathkit.html has lots of info on heathkits. Nothing specific on a particular serial number for models but it does have many dates for model runs.i.e. the HW-8 was made from 1976 - 1983. Very nice heathkit site. Good luck 73 K4TWO Gary wrote in message news:n1lju1594ovdb18m7glcun3h35a9sgvo3a@4ax.com... > Is it possible to determine the year of production for a Heathkit HW-8 > by the serial number? Article: 96578 of rec.radio.amateur.homebrew From: "Gordon Hudson" References: <1139504724.862317.108790@g43g2000cwa.googlegroups.com> <1139508076.329561.46190@f14g2000cwb.googlegroups.com> Subject: Re: bs Date: Thu, 9 Feb 2006 18:29:44 -0000 Message-ID: <43eb8a1a$0$1169$5a6aecb4@news.aaisp.net.uk> "an old friend" wrote in message news:1139508076.329561.46190@f14g2000cwb.googlegroups.com... > > Orator For Decency wrote:The Weekly FAQ - it's more important than ever > to stand up for what is right > so when do you plan to start > Don't worry, he is setting himself up as the next Maurice Kellett. Article: 96579 of rec.radio.amateur.homebrew From: Dr. Anton Squeegee Subject: Re: The Weekly FAQ - it's more important than ever to stand up for what is right Date: Thu, 9 Feb 2006 19:03:10 -0800 Message-ID: References: <1139504724.862317.108790@g43g2000cwa.googlegroups.com> In article <1139504724.862317.108790@g43g2000cwa.googlegroups.com>, radio.ham@lycos.co.uk says... > What is Ham Radio? > > (Preface) > It is becoming increasingly difficult to fly the flag for > decency and for civilised behaviour in Radio Hammery. Even Yes, and you are most definitely a prime example of how difficult it truly is. If you hate what the hobby has become so much, Beany-boi, then turn in your license. *PLONK!* Article: 96580 of rec.radio.amateur.homebrew From: Dr. Anton Squeegee Subject: Re: bs Date: Fri, 10 Feb 2006 06:23:42 -0800 Message-ID: References: <1139504724.862317.108790@g43g2000cwa.googlegroups.com> <1139542253.810562.190710@g47g2000cwa.googlegroups.com> In article <1139542253.810562.190710@g47g2000cwa.googlegroups.com>, kb9rqz@yahoo.com says... > > Dr. Anton Squeegee wrote: > > If you hate what the hobby has become so much, Beany-boi, then > > turn in your license. > > do we have any evidence that he even has a current license to turn in? Wow... Good point! I hadn't even thought of that. Still... If those silly "FAQ" posts are coming from who I think they're from (a morphed Airy R. Bean), then yes, I'm pretty sure s/h/e/it is, in fact, licensed. As to what, exactly, said license is for, well, that's another subject for debate. ;-) 73 de KC7GR (formerly WD6EOS) Article: 96581 of rec.radio.amateur.homebrew Date: Fri, 10 Feb 2006 20:02:47 +0200 From: Risto Tiilikainen Subject: Re: Crystals References: <1139247813.245486.129660@z14g2000cwz.googlegroups.com> <43ea73bd$0$25359$39db0f71@news.song.fi> <1139523472.601881.312160@g47g2000cwa.googlegroups.com> Message-ID: <43ecd486$0$7484$39db0f71@news.song.fi> mrhaney wrote: >Thanks Risto, exactly what I needed to know..I do recall something >about using them in a lattice filter.. I may try that.. W4PQW > > > Hi ! Go to library and borrow an old ARRL Single Side Hanbook (fourth edition is very good) from 60 tales. Maybe some of your friends is having it or it already stands in your own bookshelf. 73 , Risto OH2BT Article: 96582 of rec.radio.amateur.homebrew From: Ken Weitzel Subject: Re: static-grounding of meter movements? References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> Message-ID: Date: Fri, 10 Feb 2006 21:13:59 GMT dances_with_barkadas@yahoo.com wrote: > how to effectively put an analog-meter's clear plastic cover at dc > ground, to prevent buildup of static charge? Hi... Wipe it down with a clean cloth moistened with just a bit of dilute liquid fabrid softener occasionally :) Take care. Ken Article: 96583 of rec.radio.amateur.homebrew From: Spehro Pefhany Subject: Re: static-grounding of meter movements? Date: Fri, 10 Feb 2006 16:41:44 -0500 Message-ID: <4u1qu19ll43g3rlnh7rfuc1fcfi52b9442@4ax.com> References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> On 10 Feb 2006 13:01:07 -0800, the renowned dances_with_barkadas@yahoo.com wrote: >how to effectively put an analog-meter's clear plastic cover at dc >ground, to prevent buildup of static charge? Ha, that's a good one. Try an anti-static liquid or spray. You can buy (expensive) stuff for electronics or try a consumer anti-static spray compatible with the plastic (probably acrylic). Test before spraying it all over the cover. 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: 96584 of rec.radio.amateur.homebrew From: "Frank Bemelman" References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> Subject: Re: static-grounding of meter movements? Date: Fri, 10 Feb 2006 22:55:11 +0100 Message-ID: <43ed0b8a$0$4985$e4fe514c@dreader18.news.xs4all.nl> schreef in bericht news:1139605267.419899.135370@g44g2000cwa.googlegroups.com... > how to effectively put an analog-meter's clear plastic cover at dc > ground, to prevent buildup of static charge? Replace the movement with a digital readout. -- Thanks, Frank. (remove 'q' and '.invalid' when replying by email) Article: 96585 of rec.radio.amateur.homebrew From: "Frank Bemelman" References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> <43ed0b8a$0$4985$e4fe514c@dreader18.news.xs4all.nl> Subject: Re: static-grounding of meter movements? Date: Sat, 11 Feb 2006 00:46:28 +0100 Message-ID: <43ed25a1$0$26621$e4fe514c@dreader17.news.xs4all.nl> "Jerry Avins" schreef in bericht news:CI6dncaYhJjhiHDeRVn-qg@rcn.net... > Frank Bemelman wrote: > > schreef in bericht > > news:1139605267.419899.135370@g44g2000cwa.googlegroups.com... > > > >>how to effectively put an analog-meter's clear plastic cover at dc > >>ground, to prevent buildup of static charge? > > > > > > Replace the movement with a digital readout. > > How will that help? I assumed the problem was false readings caused by static charge. -- Thanks, Frank. (remove 'q' and '.invalid' when replying by email) Article: 96586 of rec.radio.amateur.homebrew Date: Fri, 10 Feb 2006 19:34:56 -0600 From: jerry wass Subject: Re: static-grounding of meter movements? References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> Message-ID: <43ed3af9$1_2@newspeer2.tds.net> dances_with_barkadas@yahoo.com wrote: > how to effectively put an analog-meter's clear plastic cover at dc > ground, to prevent buildup of static charge? > In Lieu of sprays & wet stuff--get one of those fabric-softner paper rags ya throw in the drier to stop static kling. get a string anywhere >from 24 to 37 inches long, tie one end of it to the paper towel, & the other end to a place you can reach in the cockpit. wipe meter occasionally.. Jerry Article: 96587 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: static-grounding of meter movements? Message-ID: References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> Date: Fri, 10 Feb 2006 19:00:07 -0700 On 10 Feb 2006 13:01:07 -0800, dances_with_barkadas@yahoo.com wrote: >how to effectively put an analog-meter's clear plastic cover at dc >ground, to prevent buildup of static charge? Commercially this is done with a very thin metallic film over the plastic... so thin that it's not visible. I don't know if there's a DIY way to do it. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | It's what you learn, after you know it all, that counts. Article: 96588 of rec.radio.amateur.homebrew From: Jim Thompson Subject: Re: static-grounding of meter movements? Message-ID: References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> <1139623293.288186.181420@z14g2000cwz.googlegroups.com> Date: Fri, 10 Feb 2006 19:05:12 -0700 On 10 Feb 2006 18:01:33 -0800, "Dasha Grant" wrote: >ONLY A HOMOSEXUAL WOULD WORRY ABOUT BUILD UP OF STATIC CHARGE What a scumbag. Bye. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | It's what you learn, after you know it all, that counts. Article: 96589 of rec.radio.amateur.homebrew From: "VK4FACT" Subject: NEW WEBSITE Message-ID: Date: Sat, 11 Feb 2006 02:23:42 GMT http://www.vkcorner.com Article: 96590 of rec.radio.amateur.homebrew From: "Asimov" Subject: Re: static-grounding of meter movements? Message-ID: References: Date: Sat, 11 Feb 2006 05:01:57 GMT "Jim Thompson" bravely wrote to "All" (10 Feb 06 19:00:07) --- on the heady topic of "Re: static-grounding of meter movements?" JT> From: Jim Thompson JT> Xref: core-easynews sci.electronics.repair:358021 JT> sci.electronics.design:548681 rec.radio.amateur.homebrew:91833 JT> rec.aviation.homebuilt:253291 sci.engr.control:38467 JT> On 10 Feb 2006 13:01:07 -0800, dances_with_barkadas@yahoo.com wrote: >how to effectively put an analog-meter's clear plastic cover at dc >ground, to prevent buildup of static charge? JT> Commercially this is done with a very thin metallic film over the JT> plastic... so thin that it's not visible. JT> I don't know if there's a DIY way to do it. Is it Indium based paint like in LCD display conductors? A*s*i*m*o*v Article: 96591 of rec.radio.amateur.homebrew From: "Jim Stewart" References: <1137174301.633511.266870@g47g2000cwa.googlegroups.com> <1137174889.447147.92530@g44g2000cwa.googlegroups.com> <1137254500.736091.161950@g44g2000cwa.googlegroups.com> <1137266491.152079.324090@g49g2000cwa.googlegroups.com> <1137287865.079245.260570@f14g2000cwb.googlegroups.com> <1137338238.319507.188650@f14g2000cwb.googlegroups.com> <1137353789.349967.122950@f14g2000cwb.googlegroups.com> Subject: Re: steve talking shit again Message-ID: Date: Sat, 11 Feb 2006 13:56:44 GMT hi -- http://jimstewart.net/ "an_old_friend" wrote in message news:1137353789.349967.122950@f14g2000cwb.googlegroups.com... > > K4YZ wrote: >> Dave Heil wrote: >> > an_old_friend wrote: >> > > Dave Heil wrote: >> > >> an_old_friend wrote: >> > >>> K4YZ wrote: >> > >>>> Dear Chaps in the UK: >> > >>>> >> > >>>> The hate and discontent just spewed upon you per the nickname >> > >>>> of >> > >>>> "an_old_friend" is none other than Mark C. Morgan, KB9RQZ. >> > >>> >> > >>> no hate spewed stve just caling #### #### >> > >> >> > >> If you're referring to your original post, you are quite correct. >> > >> It >> > >> was and is. >> > > >> > > indeed and that means Steve lied in calling it something else >> > >> > No, I don't think he did. You just summed up your post very >> > succinctly. >> > Steve was much too kind. > > yes he lied in calling ti hate > > it was shit >> >> He'll never understand what he did to himself there, Dave... > > I sur e did > > I took that ponderous bog shit that the idoit reopsts so often buried > one of the read in a mire of shit > >> >> Just sit back and enjoy the show! >> >> I am! >> >> 73 >> >> Steve, K4YZ > Article: 96592 of rec.radio.amateur.homebrew From: Richard Lamb Subject: Re: static-grounding of meter movements? References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> <1139623293.288186.181420@z14g2000cwz.googlegroups.com> Message-ID: Date: Sat, 11 Feb 2006 14:36:26 GMT Jim Thompson wrote: > On 10 Feb 2006 18:01:33 -0800, "Dasha Grant" > wrote: > > >>ONLY A HOMOSEXUAL WOULD WORRY ABOUT BUILD UP OF STATIC CHARGE > > > What a scumbag. Bye. > > ...Jim Thompson I realize that this kind of behavior is common on most of the net, but it is NOT welcome at RAH. Please take your ugly attitude (and language) and go away until you can display some maturity and a bit of self control. Richard Article: 96593 of rec.radio.amateur.homebrew From: Paul Burridge Subject: Query on phase shift in Network Analyzer Interconnects... Date: Sat, 11 Feb 2006 15:11:40 +0100 Message-ID: The RG-214 cable I ordered from Germany to make up some patch leads for my VNA has finally arrived. It was advertised as "high-end audio cable" which is what it's commonly sold as over there (those wacky Germans!) but it *is* the real deal low-loss 50 ohm UHF cable, nevertheless (just as well since it took 3 months to arrive). Now I have to make up these leads with N-type connectors to replace the stock leads that didn't come with the analyzer. These hook up the VNA to the Transmission/Reflection Test Set (which I do have). I see >from HP's tech spec that the interconnects I need to copy comprise what was originally sold as the "11851A RF cable kit" and it consists of four cables. Now here's the tricky bit: "Kit includes three 24" 50 ohm cables, phase-matched to 4 degrees @ 1300Mhz and one 34" cable. The 34" cable is used to phase balance the transmission path of the Transmission/Reflection Test Set." So does this mean the cable lengths are critical and if so, how best to go about making them up? thanks, p. -- "What is now proved was once only imagin'd" - William Blake Article: 96594 of rec.radio.amateur.homebrew From: "SQLit" References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> Subject: Re: static-grounding of meter movements? Message-ID: <8VnHf.13$vE1.7327@news.uswest.net> Date: Sat, 11 Feb 2006 09:02:41 -0700 wrote in message news:1139605267.419899.135370@g44g2000cwa.googlegroups.com... > how to effectively put an analog-meter's clear plastic cover at dc > ground, to prevent buildup of static charge? I had this problem with a Simpson 260 years ago. Some uninformed person used something to wipe the plastic screen/cover with something that imparted static. Drove the needle crazy. I ended up replacing the screen/cover and the problem when away. I do not think that grounding the screen, non conductive to the dc ground is going to help. but I have been wrong before. Article: 96595 of rec.radio.amateur.homebrew From: Rich Grise Subject: Re: Query on phase shift in Network Analyzer Interconnects... Message-ID: References: Date: Sat, 11 Feb 2006 17:38:25 GMT On Sat, 11 Feb 2006 15:11:40 +0100, Paul Burridge wrote: > The RG-214 cable I ordered from Germany to make up some patch leads for my > VNA has finally arrived. It was advertised as "high-end audio cable" which > is what it's commonly sold as over there (those wacky Germans!) but it > *is* the real deal low-loss 50 ohm UHF cable, nevertheless (just as well > since it took 3 months to arrive). > > Now I have to make up these leads with N-type connectors to replace the > stock leads that didn't come with the analyzer. These hook up the VNA to > the Transmission/Reflection Test Set (which I do have). I see from HP's > tech spec that the interconnects I need to copy comprise what was > originally sold as the "11851A RF cable kit" and it consists of four > cables. Now here's the tricky bit: > > "Kit includes three 24" 50 ohm cables, phase-matched to 4 degrees @ > 1300Mhz and one 34" cable. The 34" cable is used to phase balance the > transmission path of the Transmission/Reflection Test Set." > > So does this mean the cable lengths are critical and if so, how best to go > about making them up? I'd brush up on my N connector soldering, so I can get it in a consistent place relative to the end of the cable, and just measure four cables of 24" minus 2X whatever the length of the rest of the N connector is, and possibly put them in some kind of jig. It doesn't sound like it's the _length_ that's critical, but the _matching_ of those lengths. About the 34" cable, I have no idea what the rest of that sentence means. ;-) Cheers! Rich Article: 96596 of rec.radio.amateur.homebrew Date: Sat, 11 Feb 2006 21:19:06 +0200 From: Risto Tiilikainen Subject: Re: static-grounding of meter movements? References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> Message-ID: <43ee37e8$0$25337$39db0f71@news.song.fi> dances_with_barkadas@yahoo.com wrote: >how to effectively put an analog-meter's clear plastic cover at dc >ground, to prevent buildup of static charge? > > > Hi ! Visit the nearest university where is an electron microscope. They have sputter devices to cover EM samples with a thin gold, silver or carbon layer. Maybe you can motivate them to sputter your meter front plate with a thin and practically invisible gold layer . Ask them to sputter the inside of the plate. They have also silver paint for SEM samples You need to paint a narrow conductor outside from this sputtered inner surface to ground the sputtered area. Best to paint a conductor to all 4 corners Once I sputtered a table tennisball with gold. The idea was to make a very light corona hat for a low band wire vertical lifted by helium balloon 73, Risto OH2BT Article: 96597 of rec.radio.amateur.homebrew From: "Paul E. Schoen" Subject: Re: static-grounding of meter movements? Date: Sat, 11 Feb 2006 16:08:53 -0500 Message-ID: <11uskcs1rj958ec@corp.supernews.com> References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> "Jim Thompson" wrote in message news:h6hqu1ltggrkihpq80tvr0sv2t15et8thm@4ax.com... > On 10 Feb 2006 13:01:07 -0800, dances_with_barkadas@yahoo.com wrote: > > >how to effectively put an analog-meter's clear plastic cover at dc > >ground, to prevent buildup of static charge? > > Commercially this is done with a very thin metallic film over the > plastic... so thin that it's not visible. > > I don't know if there's a DIY way to do it. > > ...Jim Thompson When I worked at EIL many years ago as a meter technician, we had antistatic spray that we applied both inside and outside the plastic meter covers. It was probably very similar to a detergent or fabric softener. I think such sprays are still available from Tech-Spray or similar suppliers, and also places that cater to electronics repair, like MCM. I think antistatic sprays are also used on drive belts in VCRs and tape players. Some meters I worked on had a metal plate on the lower part of the inside cover, and it was connected to the frame of the movement with a small leaf spring. I have seen some sensitive meters where the pointer could be dragged to half scale, and would stay there for a while, by rubbing the outside of the plastic cover. This is certainly a concern for accuracy. The older glass cover windows did not have such problems with static. -- Paul E. Schoen, President P S Technology, Inc. Cockeysville, MD www.pstech-inc.com Article: 96598 of rec.radio.amateur.homebrew From: Keith Subject: Re: static-grounding of meter movements? Date: Sat, 11 Feb 2006 16:06:55 -0500 Message-ID: References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> On Fri, 10 Feb 2006 19:00:07 -0700, Jim Thompson wrote: > On 10 Feb 2006 13:01:07 -0800, dances_with_barkadas@yahoo.com wrote: > >>how to effectively put an analog-meter's clear plastic cover at dc >>ground, to prevent buildup of static charge? > > Commercially this is done with a very thin metallic film over the > plastic... so thin that it's not visible. > > I don't know if there's a DIY way to do it. Dish washing soap? IIRC, something similar is used in anti-stat baggies. -- Keith Article: 96599 of rec.radio.amateur.homebrew From: ".Blueskies." References: <1139605267.419899.135370@g44g2000cwa.googlegroups.com> <11uskcs1rj958ec@corp.supernews.com> Subject: Re: static-grounding of meter movements? Message-ID: Date: Sun, 12 Feb 2006 13:00:23 GMT "Paul E. Schoen" wrote in message news:11uskcs1rj958ec@corp.supernews.com... > ...> I have seen some sensitive meters where the pointer could be dragged to half > scale, and would stay there for a while, by rubbing the outside of the > plastic cover. This is certainly a concern for accuracy. The older glass > cover windows did not have such problems with static. > > > -- > Paul E. Schoen, President > P S Technology, Inc. > Cockeysville, MD > www.pstech-inc.com > > Need to get the calibration just right...One swipe or two? ;-)