Daily GLOWBUGS
Digest: V1 #45
via AB4EL Web Digests @ SunSITE
Purpose: building and operating vacuum tube-based QRP rigs
Subject: glowbugs V1 #45
glowbugs Thursday, May 29 1997 Volume 01 : Number 045
Date: Wed, 28 May 1997 19:27:09 -0400 (EDT)
From: rdkeys@csemail.cropsci.ncsu.edu
Subject: 1925 Hartley article now in GB archives
For your educational enlightenment, I have added Rufus P. Turner's
1925 construction article on a simple single tuber '01A Hartley set
(AM and CW) to the GB archives on piobaire.mines.uidaho.edu, in the
pub/Glowbugs/Articles directory.
This is a fine little set, and I have worked 1500 miles in winter on
one. It is the simplest, basic loose coupled Hartley oscillator rig,
for 160/80M, and can be run with any small receiving triode from the
classic '01A to a 6J5 to a 6C4, and if ye holds yer mouthe righte,
even an '833 (at QRP, of course). It will run on plate voltges as low
as 24 volts and as high as yer conscience (and the tube) permits.
I run mine on 48 volts for local QSO's and if I am feeling lusty,
on 150 volts for DX work, using a 6J5 tube. If you try AM with it,
you are on your own, since I don't run AM, but it uses link modulation
from a carbon mike in the primary circuit.
73/ZUT DE NA4G/Bob UP
Date: Wed, 28 May 1997 20:12:30 -0500 (CDT)
From: mjsilva@ix.netcom.com (michael silva)
Subject: FS: Eico 667 Tube Tester
Hi all,
I'm selling my Eico 667 tester that I've used for the last year. It's
a "dynamic conductance" tester, meaning it tests both emission and
transconductance, but it doesn't actually produce a 'umhos' number on
the meter. The outside is an 8 and the inside is a 10 (no fooling, it
had the protective plastic coating on the inside surface when I got
it!). The mini 9 pin socket is a little flakey but still works. There
were two models of 667, one with internal roll chart and one without --
this is the one without. It comes with copies of the settings book and
owner's manual. It will test anything from an '01A to compactrons, but
for 4, 5, 6 and 7 pin tubes you'll need to buy or build an adaptor
which connects all the pin 1s, all the pin 2s, etc. I cobbled one up
just with a medium 7 pin socket and an octal plug to test some 1625s
and it worked fine. I was going to mount all four sockets in a little
Radio Shack box but never got around to it.
Price is $60 plus shipping. I thought I'd offer it here on the list
before putting it on the swap group. Also open to swaps (books, ???)
BTW, also tests transistors, whatever they are <g>.
73,
Mike, KK6GM
Date: Wed, 28 May 1997 20:45:45 -0500 (CDT)
From: Bob Roehrig <broehrig@admin.aurora.edu>
Subject: 1st FMT results
Well, the deadline has passed and so posted below are the results of the
1st BA Frequency Measuring Test. I must say that I am disappointed in the
response to this event, especially considering the number of LM and BC-221
freq meters out there and all your BA receivers. So I hope next time we
have more takers.
Only two people sent me results: Sandy (W5TVW) and Al (N3FRQ). Here are
the results:
Xmit freq Sandy's results Al's results
1st run
3,602,096.9 Hz 3,602,142.0 (+42Hz) 3,602,050.0 (-46.9Hz)
7,175,469.4 Hz 7,175,619.0 (+149.6Hz) 7,174,950.0 (-519.4Hz)
14,061,230.6 Hz 14,061,400.0 (+170Hz) 14,060,820.0 (-410Hz)
2nd run
3,599,733.1 Hz 3,599,900.0 (+167Hz) none
7,173,924.4 Hz 7,174,380.0 (+455.6) none
14,069,097.2 Hz 14,069,143.0 (+45.8Hz) none
E-mail broehrig@admin.aurora.edu 73 de Bob, K9EUI
CIS: Data / Telecom Aurora University, Aurora, IL
630-844-4898 Fax 630-844-5530
Date: Wed, 28 May 1997 22:10:41 -0500 (CDT)
From: Spencer Petri <spetri@e-tex.com>
Subject: Radiotron Designers 4th Ed CDROM
This was posted on boatanchors.
>I was just looking through the Old Colony Sound Lab catalog and the CDROM
>version of the 4th edition has been reduced from $69.95 to $29.95. Phone
>is 603 924 6371.
73 de Pete WA5JCI
*******************************************************************
EM-21--6 Mtr -- WAS #490, WAC CW, DXCC/91 Countries, VUCC #361/618 Grids
*******************************************************************
2 Mtr -- 36 States -- VUCC #346/183 Grids
*************************************
Date: Wed, 28 May 1997 22:52:23 -0500 (EST)
From: "Roberta J. Barmore" <rbarmore@indy.net>
Subject: Quick note...
Hi!
Well, ARRL told me it was time to renew, and while on a rare
web-browse, I looked again at the RSGB site and was in signing-up
mode...so this morning, I called up RSGB and joined! Now to add that
second diamond to the QSL cards... :) (Considering looking into WIA,
too--excerpts I have seen from *their* mag look awfully interesting!)
Noticed there's an RSGB history book available--has anyone here read
it? Looks interesting, similar to "200 Meters and Down" but continuing up
to the present day.
73,
--Bobbi
Date: Thu, 29 May 1997 06:01:00 GMT
From: ralph.hartwell@emachine.com (Ralph Hartwell)
Subject: Bad GRC-109 Experience pl
C>Upon examination of the TX plug, I found a crack in it, going from the HT
C>pin through the inert pin to the ground pin. It also scorched the surface
C>of the PSU TX socket (a small area of surface damage only, I believe).
<snip>
C>Does anyone know where I might find a replacement plug and cord for the 109
C>TX? Failing that, does anyone know where I might find a plug matching the
C>TX plug, even if not original equipment? Failing that, has anyone any ideas
C>how I might solve my problem? Perhaps I could purchase someone's derelict
Well, I'm at a disadvantage, not having seen the connector, but that
won't stop me from giving advice. <G>
I have repaired some cracked/arced connectors in the past by drilling
a small hole through the crack in the insulator where the crack runs
between the pins.
Drill the hole all the way through the plastic, if possible. I try
to drill as large a hole as I can without damaging the pins, so as to
remove as much of the damaged insulator as possible.
After drilling the hole, I fill the hole with epoxy cement. After
the hole is filled, I then plug one end of the hole with wax to prevent
the epoxy from running out; smooth over the epoxy at the other end of
the hole, and let 'er harden a day or so. That usually does the trick
for me, since most epoxies handle HV very well.
Ralph W5JGV
- ---
þ QMPro 1.52 þ Klingon DOS: That command or file name has no *honor*!
Date: Thu, 29 May 1997 07:31:58 -0400
From: Adam Liette <kb8ydx@geocities.com>
Subject: Antigue Electronic Supply
I know I could just call them and it would be faster, but
does AES (Arizona) have a webpage and/or e-mail?
Would be very helpful in finding their prices.
TNX
Adam Liette
URL:kb8ydx.base.org
E-Mail:kb8ydx@geocities.com
- --------- --------
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..._._
Date: Thu, 29 May 1997 07:56:30 -0700 (PDT)
From: Ken Gordon <keng@uidaho.edu>
Subject: Re: Antigue Electronic Supply
On Thu, 29 May 1997, Adam Liette wrote:
>
> I know I could just call them and it would be faster, but
> does AES (Arizona) have a webpage and/or e-mail?
> Would be very helpful in finding their prices.
No mention of such in their catalog or supplements.
Ken W7EKB
Date: Thu, 29 May 1997 08:37:49 -0700 (MST)
From: Jeff Duntemann <jeff.duntemann@coriolis.com>
Subject: 1st cut at schematic for 3-tube 12V DC receiver
Hi gang--
I've posted the first cut at a schematic for my 80m 3-tube space charge
(that is, 12V on the plates) tube direct conversion receiver on my FTP
site. NOTE WELL that this is NOT a perfected schematic. I've gotten all
three stages functioning at one point or another in different prototype
lashups, but this is the first time all three have been together in this
configuration. So I would bet it's pretty close.
I'm currently waiting for some coils for the RF amp and converter stages.
Last night I made the audio amp work but am still tinkering with the triode
plate resistor. 47K from 12V to plate works pretty well, but I've got
additional experiments planned and that value is tentative. (I have no
design tables or formulae for resistance coupled amps running at 12V on the
plates!) I tried a 12K5 single-stage amp, as described in a message I
posted here last week, but I couldn't get the gain I wanted and had to move
to the 12AL8 triode-tetrode. That one seems to have all the gain I need.
Apart from the plate voltage the circuit is pretty conventional.
If anyone would like a look at the schematic I'm working to, go get:
ftp://ftp.coriolis.com/pub/Shareware/dcrcvr.zip
There are Visio version 2, 3, and 4 files, plus an AutoCAD file and a
Windows Metafile (.WMF).
I'll post an updated file as soon as I get the coils and figure out what
works.
- --73--
- --Jeff Duntemann KG7JF
Scottsdale, Arizona
Date: Thu, 29 May 1997 12:41:41 -0400 (EDT)
From: rdkeys@csemail.cropsci.ncsu.edu
Subject: SCR-54/SCR-54-A Manual now in GB archives
For your educational elightenment, I have placed the WWI U.S. Army
SCR-54/SCR-54-A Radio Receiving Set manual in the GB archives at
piobaire.mines.uidaho.edu in the Glowbugs/Manuals/SCR54 directory.
This is the WWI trench radio receiver designed to allow air to ground fire
control, but used generally in that era as a small portable ground radio
set. It is the first U.S. Army set, from what I can tell, that uses a
vacuum tube detector as an option, as a regenerative detector.
Thus it can glow if required.....(:+}}....
73/ZUT DE NA4G/Bob UP
Date: Thu, 29 May 1997 18:22:36 -0500 (CDT)
From: Dave <gekko95@ix.netcom.com>
Subject: AES Webpage update...
Hi all,
I placed a tube order with AES this morning and asked about a web page.
I was told that it is basically ready to go online, but there was a
problem with the company building it and the online date has now been
bumped to June 15th. I didn't get the URL, but will be easy to
find out anyway.
For your info...
Dave WB7AWK
*********************************************************
"The Forests Will Echo" - all rights reserved by Studio
book/lights/sound included. Director: Speilberg, S.
Producer: Marshall, F. 1st Cut deadline: August 1, 1997
1st Call: May 29, 1997 6 AM Studio B, stage 1 (non-catered)
email stage manager for individual calls for all trades.
*********************************************************
End of glowbugs V1 #45
**********************
Created by Steve Modena, AB4EL
Comments and suggestions to modena@SunSITE.unc.edu