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References: [ +from:n1rj@roadrunner.com: 55 ]

Total 55 documents matching your query.

1. [Amps] Johnson 6N2 Thunderbolt (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Tue, 26 Jun 2007 11:27:18 -0400
I'm looking for any information on the PA output ceramic bandswitch wafer. The one on my amp is broken. Thanks, Roger N1RJ _______________________________________________ Amps mailing list Amps@conte
/archives//html/Amps/2007-06/msg00143.html (6,404 bytes)

2. Re: [Amps] Bird 43p mod?? (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Sun, 01 Jul 2007 17:59:57 -0400
The biggest power hogs with the Bird circuit are the two Zener shunt regulators. I lifted one end of the diodes in my Bird which increased battery life considerably. Before and after tests did not re
/archives//html/Amps/2007-07/msg00017.html (8,261 bytes)

3. Re: [Amps] 807s (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Sun, 29 Jul 2007 17:35:41 -0400
Another version we had in the URC-7 transceiver (US Coast Guard) was a 2.5 volt instant heating version. 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ ________________________
/archives//html/Amps/2007-07/msg00513.html (8,370 bytes)

4. Re: [Amps] 807s (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Sun, 29 Jul 2007 18:18:26 -0400
They were type 1624 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting
/archives//html/Amps/2007-07/msg00516.html (6,592 bytes)

5. Re: [Amps] No lids, no kids, no . . . (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Thu, 27 Sep 2007 21:23:47 -0400
Ah yes. Stanley K1SJ. Used to sit on 3801 and talk to his sycophants. Clobbered the hell out of the top of the Dx window. Fortunately, I had a pair of phased verticals at the time and was able to wor
/archives//html/Amps/2007-09/msg00440.html (7,774 bytes)

6. Re: [Amps] Needed Info (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Thu, 21 Feb 2008 10:32:15 -0500
Of course one needs a tube with 4000 watts plate dissipation to run 375 watts output on AM. Give me a break! 73, Roger -- Remember the USS Liberty (AGTR-5) http://ussliberty.org/ ____________________
/archives//html/Amps/2008-02/msg00140.html (7,345 bytes)

7. Re: [Amps] Relays (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Mon, 31 Mar 2008 08:33:13 -0400
My old TS-940 actuated the internal relay from a line that went positive 3ms after keydown. Add 2 ms for the relay to actuate and the relay pulled in about 5ms from keydown. The 940 produced RF 6ms a
/archives//html/Amps/2008-03/msg00385.html (8,994 bytes)

8. [Amps] Pi Networks (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Tue, 01 Apr 2008 08:20:08 -0400
A reminder to those who forgot or those who never knew. Many of the pubs and websites used by hams to calculate the values of Pi and Pi-L networks are WRONG! This is especially true for networks with
/archives//html/Amps/2008-04/msg00005.html (7,303 bytes)

9. Re: [Amps] Ameritron (et. al.) filament voltages (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Thu, 28 Jan 2010 16:02:42 -0500
From the Burle site: http://www.burle.com/cgi/byteserver.pl/pdf/tp117.pdf For thoriated tungsten filaments, a 3% increase in voltage results in a 50% decrease in tube life! Check the voltage at the t
/archives//html/Amps/2010-01/msg00402.html (8,439 bytes)

10. [Amps] Drake L-7 problem (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Tue, 23 Mar 2010 09:23:05 -0400
This AM I was tuning up on 75m and there was a loud bang followed by the odor of burning circuit board. I found that the 47 pf PCB cap across part of the plate RF choke had burned through. This cap a
/archives//html/Amps/2010-03/msg00488.html (6,526 bytes)

11. [Amps] Indirectly heated cathodes (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Sat, 03 Apr 2010 18:25:04 -0400
One of the big disadvantages of the indirectly heated cathode is it's warm-up time. has anyone experimented with using a lower "keep alive" voltage to allow faster warm-up when full voltage is applie
/archives//html/Amps/2010-04/msg00060.html (7,259 bytes)

12. [Amps] AL-1200 (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Tue, 21 Sep 2010 10:32:24 -0400
I've been pondering the purchase of a new amp. The AL-1200 looks like a good fit to my requirements especially now that it comes with the 3CX1200Z7. On Greg Ordy's site he indicates that the old 3 po
/archives//html/Amps/2010-09/msg00241.html (6,686 bytes)

13. Re: [Amps] Autotuner for Amp Input (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Fri, 08 Oct 2010 12:43:31 -0400
Here is a good site for calculating impedance matching networks: http://bwrc.eecs.berkeley.edu/research/rf/projects/60ghz/matching/impmatch.html In the old days when exciters had tubes and tuned outp
/archives//html/Amps/2010-10/msg00127.html (8,274 bytes)

14. Re: [Amps] Do you think he'll get it? (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Sat, 30 Oct 2010 17:48:09 -0400
Ip of 600 ma for 1.5kw output? Something fishy! 73, Roger _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-10/msg00436.html (7,353 bytes)

15. Re: [Amps] Low Input SWR Amps Networks (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Wed, 03 Nov 2010 14:48:15 -0400
See Tom's site: http://www.w8ji.com/tuned_input_circuit.htm 73, Roger _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf
/archives//html/Amps/2010-11/msg00021.html (7,480 bytes)

16. Re: [Amps] Restoring DX-100 (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Sat, 15 Jan 2011 14:22:55 -0500
My RCA tube manual says (for 2 tubes ICAS) 600 volts Vp, 214 ma Ip, Po 104 watts! As you state in your article on 6146 series tubes, the 6293 is mo better in this application. 73, Roger _____________
/archives//html/Amps/2011-01/msg00158.html (9,233 bytes)

17. Re: [Amps] What to buy? (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Thu, 27 Jan 2011 14:33:30 -0500
I would find it excruciating to wait 3 minutes for my amp to warm up. Give me an instant on triode with a hefty grid anytime. 73, Roger _______________________________________________ Amps mailing li
/archives//html/Amps/2011-01/msg00370.html (8,159 bytes)

18. Re: [Amps] Tuner Loss (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Mon, 21 Mar 2011 13:46:34 -0400
Here is a fun program to play with: http://fermi.la.asu.edu/w9cf/tuner/tuner.html You will see that the worst case is generally trying to match low impedance (high current) loads. You can play with t
/archives//html/Amps/2011-03/msg00152.html (7,462 bytes)

19. Re: [Amps] Where is power measured ? (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Wed, 06 Apr 2011 08:38:09 -0400
FCC rules 97.313 (b) No station may transmit with a transmitter power exceeding 1.5 kW PEP 73, Roger _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2011-04/msg00220.html (7,885 bytes)

20. [Amps] WARNING! W4RT (score: 1)
Author: Roger D Johnson <n1rj@roadrunner.com>
Date: Thu, 14 Apr 2011 10:28:09 -0400
I recently purchased a LDG AT-100 autotuner from W4RT as described on their web page: http://www.w4rt.com/LDG/AT-100AMP.htm The tuner I received was a PROll model which doesn't even have a socket for
/archives//html/Amps/2011-04/msg00407.html (7,604 bytes)

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