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21. [Amps] ferrite in RF chokes for PAs (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Thu, 6 Mar 2008 08:29:02 -0700
Plate RF choke has an appreciable DC current component in it. This lowers the effective mu of the ferrite, and makes it less effective as a choke. As a matter of fact, the value of inductance will fl
/archives//html/Amps/2008-03/msg00046.html (9,763 bytes)

22. [Amps] Warrior HA10 metering (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Fri, 14 Mar 2008 11:44:52 -0700
Allen It does sound suspicious that somehow, you have a sneak path for bleeder current to ground. The bleeders and the entire HV PS should be floated and only the neg lead should be brought back to y
/archives//html/Amps/2008-03/msg00126.html (9,322 bytes)

23. [Amps] SB220 "A" mods (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Fri, 28 Mar 2008 04:19:44 -0700
You won't get any concensus here on a single path to upgrade this venerable and easy-to-mod power amplifier. However, IMHO: Highly recommended: 1) drill the small holes to be able to lube the fan eve
/archives//html/Amps/2008-03/msg00304.html (8,540 bytes)

24. [Amps] MRF317 (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Wed, 2 Apr 2008 16:03:48 -0700
Jim The original 1980 Broadcast Electronics model FM30 transmitter used 10 of those in the 400 watt driver stage. A pair did 100 watts at 100 MHz. If you find someone still running one of those trans
/archives//html/Amps/2008-04/msg00057.html (7,508 bytes)

25. [Amps] interesting RF amplifier patents discussed over there (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Wed, 23 Apr 2008 16:33:34 -0600
On the AM Window, I posted mention of a patent I found last week: A new one, US#7,355,470 just issued to 3 guys at ParkerVision Inc. Heres a link to it: http://tinyurl.com/6ktlyj This patent is ~171
/archives//html/Amps/2008-04/msg00278.html (9,459 bytes)

26. [Amps] uneven plate glow (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Fri, 9 May 2008 10:28:28 -0600
Bill and Carl's sugestions are excellent . One more possibility is that one of the sockets isn't making good contact so that tube is emission starved. Have you tried swapping the 2 tubes in their soc
/archives//html/Amps/2008-05/msg00080.html (7,506 bytes)

27. [Amps] RF Communications RF101 power amplifier (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Thu, 10 Jul 2008 09:45:40 -0600
Does anyone have the manual and schematic of the RF Communications RF101 linear amplifier, with 3-400Zs? I picked up a working specimen of this monster yesterday in Albuquerque. 73 John K5PRO _______
/archives//html/Amps/2008-07/msg00098.html (6,599 bytes)

28. [Amps] RF Comm RF101 power amp (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Fri, 11 Jul 2008 10:31:23 -0600
I had an RF103 that I parted out 4yrs back, as a feral cat have lived inside the box and urinated all over, and corroded some of the metal. The innards all made good parts for other amplifiers, howev
/archives//html/Amps/2008-07/msg00108.html (6,719 bytes)

29. Re: [Amps] Amps Digest, Vol 67, Issue 16 (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Sat, 12 Jul 2008 18:56:13 -0600
Irridite is a chromate conversion finish for aluminum. It isn't for copper or silver. It does make aluminum surfaces much better at holding their conductivity over time, instead of creating oxide tha
/archives//html/Amps/2008-07/msg00122.html (7,575 bytes)

30. [Amps] Basler Electric iron (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Sun, 20 Jul 2008 23:47:05 -0600
Why not contact customer service at Basler Electric? They are in (i think) Highland, IL, just across the Mississippi from St. Louis, MO. John K5PRO _______________________________________________ Amp
/archives//html/Amps/2008-07/msg00183.html (7,524 bytes)

31. [Amps] tube output power (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Thu, 24 Jul 2008 22:10:05 -0600
When I worked for BE, I designed the cavity amplifier that was put into production in the FM3.5A and FM5A FM transmitters. The 'standard' tube used for 3 - 5 kW FMs that used tetrodes was the 4CX5000
/archives//html/Amps/2008-07/msg00235.html (7,838 bytes)

32. [Amps] European Tube sources (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Fri, 25 Jul 2008 14:40:01 -0600
For the record here: Both Thompson and Amperex are still making glass tubes. Not all of the glass tubes, but the more profitable glass tubes. For instance, you can still buy 3-500Z from the Amperex C
/archives//html/Amps/2008-07/msg00270.html (9,564 bytes)

33. [Amps] SS relays in primaries (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Tue, 5 Aug 2008 15:37:15 -0600
Here are a couple of thoughts from experience doing this years ago with commercial transmitters: It saved money, but created headaches. If installed in the primary AC circuitry of a radio transmitter
/archives//html/Amps/2008-08/msg00038.html (9,098 bytes)

34. [Amps] RF Communications RF101 power amplifier (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Sun, 31 Aug 2008 09:02:22 -0600
Took this new (to me) beastly amplifier apart yesterday to document what it has. It was dated from the 1960s and is in great physical condition. I'll put something together online sometime with some
/archives//html/Amps/2008-08/msg00194.html (10,425 bytes)

35. [Amps] Tetrode amplifiers at LHC (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Mon, 15 Sep 2008 13:06:45 -0600
Neat link. Tetrode-based RF drivers and associated ferrite-loaded acceleration cavities are the mainstay of most large proton and heavy ion synchrotrons. A brand new machine is being operated at KEK-
/archives//html/Amps/2008-09/msg00145.html (8,301 bytes)

36. [Amps] Crowbars (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Thu, 18 Sep 2008 16:43:36 -0600
Ya, Jim, we are still using mercury ignitrons. They are good to hold off 46 kV DC and they can take a 50,000 amp impulse through them, as long as it is damped and doesn't have follow-on power (the pr
/archives//html/Amps/2008-09/msg00178.html (7,913 bytes)

37. [Amps] success crowbarring PS (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Fri, 19 Sep 2008 11:28:25 -0600
Jim Sounds like a successful Crowbar test. I like those. Silent, all that current dumps, and the transmitter survives. When the crowbar DOESN'T trigger fast enough, then all H-- breaks loose. Thats w
/archives//html/Amps/2008-09/msg00182.html (7,656 bytes)

38. Re: [Amps] Amps Digest, Vol 70, Issue 21 (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Tue, 21 Oct 2008 12:02:47 -0600
Sorry to add another 2 cents to this, but.... If the plate current meter is after the power supply output terminals, the swinging choke should have nothing to do with this excessive current when you
/archives//html/Amps/2008-10/msg00088.html (8,420 bytes)

39. [Amps] Input network for 4-1000A (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Fri, 24 Oct 2008 13:25:13 -0600
By using a parallel tank and a step up transformer, you are making it about the same complexity (only one less capacitor per tank) than you would with switched pi-networks. If you choose the relay to
/archives//html/Amps/2008-10/msg00108.html (9,186 bytes)

40. [Amps] SB220 driving problem (score: 1)
Author: "John Lyles" <jtml@losalamos.com>
Date: Sat, 1 Nov 2008 10:31:53 -0700
Didn't see your name or call there so would be helpful to know that. Secondly, yes, you don't need a full 100 watts of drive on all bands. You didn't say what band you were working on. Follow the Hea
/archives//html/Amps/2008-11/msg00008.html (8,696 bytes)

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