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1. Re: [Amps] matching network (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Mon, 26 Jan 2004 09:41:37 -0500
Ray Burke wrote: At one time, before the GPS satellites made them redundant, there was a string of Loran stations along the Atlantic coast of Canada. The workhorse at these stations was a linear, usi
/archives//html/Amps/2004-01/msg00297.html (9,069 bytes)

2. [Amps] Gu-84B socket (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Tue, 12 Oct 2004 10:05:53 -0400
Is there a reasonably priced source for these sockets? Is it possible to mount the tube without a socket? 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ _______________________
/archives//html/Amps/2004-10/msg00172.html (6,776 bytes)

3. Re: [Amps] a question on non-linearity (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 21 Oct 2004 15:59:26 -0400
CLIVE COLLINS wrote: Good evening Gentlemen, Could some learned reader advise me as to what exactly a triode's characteristics would be like if it were to be described as "non-linear". I have a worki
/archives//html/Amps/2004-10/msg00367.html (8,388 bytes)

4. Re: [Amps] Advice on instruments for ham use (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Tue, 23 Nov 2004 14:35:33 -0500
Pete Smith wrote: I'm interested in acquiring a used solid-state oscilloscope for ham use. I know this isn't the place to ask, but hope that people who hang out here can point me to a ham radio homeb
/archives//html/Amps/2004-11/msg00398.html (8,538 bytes)

5. Re: [Amps] Dx pedition amp ??? (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 02 Dec 2004 08:12:15 -0500
Josh wrote: Any feedback , comments experience on LIGHTWEIGHT travel amp - The new MFJ ALS 600 with switching supply looks good RF deck 12.5 lbs and switching supply is 10 lbs - output 500w Is the sw
/archives//html/Amps/2004-12/msg00023.html (8,078 bytes)

6. Re: [Amps] Dx pedition amp ??? (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 02 Dec 2004 09:05:34 -0500
Roger D Johnson wrote: Josh wrote: Any feedback , comments experience on LIGHTWEIGHT travel amp - The new MFJ ALS 600 with switching supply looks good RF deck 12.5 lbs and switching supply is 10 lbs
/archives//html/Amps/2004-12/msg00025.html (9,168 bytes)

7. Re: [Amps] Dx pedition amp ??? (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 02 Dec 2004 10:01:09 -0500
It's an interesting thread. There are an increasing number of tetrode powered amps coming on line with spophisticated power and control circuitry. These "goof proof" amps are nice sitting at home on
/archives//html/Amps/2004-12/msg00028.html (8,703 bytes)

8. Re: [Amps] 50 or 60 Hz, a problem? (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Mon, 10 Jan 2005 15:15:04 -0500
My SB-200 worked fine 0n 50 Hz during the 4 years I was in Germany. 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ _______________________________________________ Amps mailing
/archives//html/Amps/2005-01/msg00185.html (7,149 bytes)

9. Re: [Amps] old style armored wire ? (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Mon, 10 Jan 2005 21:11:16 -0500
chris@yipyap.com wrote: Hi, It's me again, the guy with the 1 KW AM transmitter. Today's question: All of the interconnect cables on this thing are made of a cable that I've never seen before. Not to
/archives//html/Amps/2005-01/msg00192.html (7,855 bytes)

10. Re: [Amps] 3CX1000A7 (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sun, 16 Jan 2005 08:12:02 -0500
W0UN -- John Brosnahan wrote: Biggest problem is that it is a filament HOG. 5 volts at 30 amps. But it's virtually instant warmup! No waiting an agonizing three minutes! 73, Roger -- Remember the USS
/archives//html/Amps/2005-01/msg00294.html (7,366 bytes)

11. [Amps] OT help (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sun, 23 Jan 2005 11:21:25 -0500
I recently tried to scan some Eimac tube datasheets for David Kirby's website. I am using a HP OfficeJet 6110 with the supplied HP Director software which has a save to PDF function. I found that som
/archives//html/Amps/2005-01/msg00484.html (8,953 bytes)

12. [Amps] OT help (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sun, 23 Jan 2005 21:04:49 -0500
I'd like to thank all those who replied to my problem. I downloaded, and tried, several programs but then had a flash of insight. Since the graphs are designed to be rotated 90 deg for viewing anyway
/archives//html/Amps/2005-01/msg00503.html (8,850 bytes)

13. Re: [Amps] MLA-2500B Question (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Tue, 29 Mar 2005 14:22:04 -0500
There is a problem with using a built-in tuner with a grounded grid amplifier. In a GG amp, the input and output are effectively in series. The input impedance varies with both the amp tuning and the
/archives//html/Amps/2005-03/msg00696.html (9,395 bytes)

14. Re: [Amps] Metric system (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 04 Aug 2005 23:51:47 -0400
I spent 4 years in Germany with the Coast Guard and found the metric system quite easy to use. Except for temperature! I always had to convert to Fahrenheit to get a gut feel for how cold (or warm) i
/archives//html/Amps/2005-08/msg00140.html (9,761 bytes)

15. Re: [Amps] surge limiter question (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Thu, 04 Aug 2005 23:54:34 -0400
With the troubles I've read about with tube socket pins would it not be better to come up with a scheme to measure filament current? 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.o
/archives//html/Amps/2005-08/msg00141.html (7,484 bytes)

16. Re: [Amps] mind control ray stopper (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sat, 13 Aug 2005 19:06:18 -0400
But how can you be sure? The aliens would have erased any memory of the abduction! 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ ______________________________________________
/archives//html/Amps/2005-08/msg00474.html (8,077 bytes)

17. Re: [Amps] Voltage at feed point (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sat, 26 Nov 2005 13:05:34 -0500
Hi Rob.... Paul's analysis is correct as far as it goes. However, I presume you will be using some sort of matching system at the base of the antenna. Let's assume you use a series capacitor of -j420
/archives//html/Amps/2005-11/msg00492.html (8,756 bytes)

18. Re: [Amps] Voltage at feed point (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Sat, 26 Nov 2005 13:19:41 -0500
Just as a check, I ran the numbers through Dean Straw's TLW3 program. With a low-pass L matching network using a series inductor of 28.6 uH and a Q of 300, a 458 pf shunt cap from antenna base to gro
/archives//html/Amps/2005-11/msg00493.html (7,845 bytes)

19. Re: [Amps] Tuned Input (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Fri, 20 Jan 2006 10:53:49 -0500
The purpose of the tuned input is to provide a "flywheel" effect to smooth out the variations of amplifier input impedance over the operating cycle. The Q of the circuit determines how much "flywheel
/archives//html/Amps/2006-01/msg00484.html (8,149 bytes)

20. Re: [Amps] Building or Buying a Tuned Input Network (score: 1)
Author: Roger D Johnson <n1rj@adelphia.net>
Date: Mon, 23 Jan 2006 13:07:15 -0500
I would recommend that the input capacitor be fixed as it set the Q of the circuit. I'd put the trimmer on the output to compensate for variations in circuit layout and tube input capacitance. 73, Ro
/archives//html/Amps/2006-01/msg00539.html (9,948 bytes)

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