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References: [ +from:donroden@hiwaay.net: 548 ]

Total 548 documents matching your query.

341. Re: [Amps] Triband balun (score: 1)
Author: donroden@hiwaay.net
Date: Tue, 18 Mar 2014 14:58:55 -0500
REACTANCE Don W4DNR Contrary to popular mythology, a coil of coax is NOT an effective common mode choke, because it is inductive. An effective common mode choke must have a large value of resistance
/archives//html/Amps/2014-03/msg00109.html (8,962 bytes)

342. Re: [Amps] parts sales? (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 26 Mar 2014 13:19:33 -0500
I don't understand the dislike of Ebay. I see it written as "FleaBay" , "EPay" , and various other condescending terms. Over ten years, I have close to TWO HUNDRED purchases and probably ten to fifte
/archives//html/Amps/2014-03/msg00166.html (9,394 bytes)

343. Re: [Amps] L4-B (score: 1)
Author: donroden@hiwaay.net
Date: Mon, 31 Mar 2014 20:09:34 -0500
Harris uses a sheet of it between the cavity and a large square piece of aluminum for a coupling capacitor @ 11KVDC + RF . Continental wraps it around a two piece stovepipe attached to the plate of a
/archives//html/Amps/2014-03/msg00202.html (11,319 bytes)

344. Re: [Amps] L4-B (score: 1)
Author: donroden@hiwaay.net
Date: Mon, 31 Mar 2014 20:49:05 -0500
One failure mode was when the cavity spark-gap took a lightning hit and a ball of molten brass rolled up against the plate blocker and burned a hole in the Kapton. solved by making a 4 layer catch tr
/archives//html/Amps/2014-03/msg00206.html (13,055 bytes)

345. Re: [Amps] L4-B (score: 1)
Author: donroden@hiwaay.net
Date: Tue, 01 Apr 2014 13:38:52 -0500
It seems that my posting regarding certain cautions that should be considered when using polyimide wiring made by Kapton (TM) has not met with much approval from the resident experts, in fact quite t
/archives//html/Amps/2014-04/msg00007.html (7,089 bytes)

346. Re: [Amps] 3-500Zs inverted (score: 1)
Author: donroden@hiwaay.net
Date: Fri, 04 Apr 2014 06:12:30 -0500
Relax and enjoy the day. We're half way through it here and its beautiful. 73, Alek VK6APK Take me kowalas back, Alex, Take me kowalas back, They long for the Marine Traffic, Alex. So take me kowala
/archives//html/Amps/2014-04/msg00047.html (8,662 bytes)

347. Re: [Amps] ALS-600 vs ALS-1300 (score: 1)
Author: donroden@hiwaay.net
Date: Thu, 10 Apr 2014 21:49:14 -0500
What about the Expert 2K-FA ? I could sell all my tube amps, and pick up some room in the shack. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http:/
/archives//html/Amps/2014-04/msg00129.html (7,616 bytes)

348. Re: [Amps] Soft start (score: 1)
Author: donroden@hiwaay.net
Date: Sat, 31 May 2014 20:22:01 -0500
Carl, please explain the anti-collision part.... I may get one for my airplane. Don W4DNR Ive bought several RF transistors and modules from that seller and all have worked fine but that doesnt mean
/archives//html/Amps/2014-05/msg00147.html (6,983 bytes)

349. [Amps] damping resistances (score: 1)
Author: donroden@hiwaay.net
Date: Sat, 19 Jul 2014 15:17:16 -0500
I installed an RCA 20KW FM transmitter in 1976 that included a couple of ceramic insulators that supported a 50 ohm /100 watt film resistor in the cavity. There were brass dipole elements on each end
/archives//html/Amps/2014-07/msg00078.html (8,155 bytes)

350. Re: [Amps] Ion Pump (score: 1)
Author: donroden@hiwaay.net
Date: Mon, 21 Jul 2014 07:26:48 -0500
From: "Roger (K8RI)" We used a roughing pump to get to 10^-1 Torr, then a diffusion pump to make 10^-6, (-7.with a liquid N2 cold trap) At that point we'd start the ion pump. Don W4DNR ______________
/archives//html/Amps/2014-07/msg00091.html (8,175 bytes)

351. Re: [Amps] SB-200 input. (score: 1)
Author: donroden@hiwaay.net
Date: Thu, 24 Jul 2014 19:42:04 -0500
There must have been a reason that Heath went to so much trouble to include tuned inputs. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
/archives//html/Amps/2014-07/msg00107.html (6,702 bytes)

352. Re: [Amps] for sale SB220 refurbish or part out whole (score: 1)
Author: donroden@hiwaay.net
Date: Sat, 27 Sep 2014 11:32:21 -0500
it also has been in a flood so it shows dirt on the case and meters I'm selling AS price $400 plus shipping . How long was it under water ? How was it cleaned after the flood ? Thanks Don W4DNR _____
/archives//html/Amps/2014-09/msg00034.html (7,037 bytes)

353. Re: [Amps] 10A10 high voltage diodes (score: 1)
Author: donroden@hiwaay.net
Date: Thu, 16 Oct 2014 18:48:14 -0500
Yankees............ I love 'em !! Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2014-10/msg00098.html (8,063 bytes)

354. [Amps] 3CX3000s (score: 1)
Author: donroden@hiwaay.net
Date: Fri, 17 Oct 2014 11:02:25 -0500
Why one 3CX3000A7 amp? why not? If the 3CX-3000F7 is used, then NO socket is required. What do you use for a quiet fan for a 3CX3 Amp ? Don W4DNR _______________________________________________ Amps
/archives//html/Amps/2014-10/msg00119.html (8,105 bytes)

355. Re: [Amps] Solid State Amps (score: 1)
Author: donroden@hiwaay.net
Date: Fri, 17 Oct 2014 23:39:41 -0500
Or from my German grandfathers: " Was fur ein Haufen Scheisse" And your sweet little German grandmother would have washed your mouth out with soap if she heard her grandson using such language !!!! D
/archives//html/Amps/2014-10/msg00151.html (9,029 bytes)

356. Re: [Amps] Alpha 8410 using 4CX1500B - why? (score: 1)
Author: donroden@hiwaay.net
Date: Fri, 31 Oct 2014 11:01:14 -0500
Quoting John Lyles <jtml@losalamos.com>: Enjoy building amplifiers and don't make it a pain for yourself or your peers. 73 John K5PRO Good post John, Sounds like you had the perfect job for a ham rad
/archives//html/Amps/2014-10/msg00280.html (8,871 bytes)

357. Re: [Amps] Reducing heat in tetrode amps with EBS (score: 1)
Author: donroden@hiwaay.net
Date: Fri, 31 Oct 2014 11:46:06 -0500
plate > voltage and 325V screen voltage. Jim, How much heat/electricity are you saving as a % of total Amp usage ? Don W4DNR _______________________________________________ Amps mailing list Amps@co
/archives//html/Amps/2014-10/msg00281.html (8,727 bytes)

358. [Amps] Terrain Mapping for EZNEC ( Again ) (score: 1)
Author: donroden@hiwaay.net
Date: Sun, 14 Dec 2014 14:59:02 -0600
Several months ago, someone recommended a mapping program that looked at the near field ground around a tower to predict take-off angles and ground reflection gains. I try to keep important emails, b
/archives//html/Amps/2014-12/msg00057.html (6,725 bytes)

359. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: donroden@hiwaay.net
Date: Sun, 28 Dec 2014 10:49:24 -0600
When the 4X150 was upgraded to the 4CX250 anode fins ( more fins and more restrictive air flow ) it's dissipation rating went to 250 watts. No internal changes. The upgraded 4X150 was only in product
/archives//html/Amps/2014-12/msg00122.html (8,505 bytes)

360. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: donroden@hiwaay.net
Date: Sun, 28 Dec 2014 15:59:05 -0600
I suspect when EIMAC came out with the 7034 they wanted to suggest that they were a good replacement for the 4X150A I once asked Bill Orr how much air would be sufficient for a quad of 250Bs. Orr lov
/archives//html/Amps/2014-12/msg00125.html (9,872 bytes)

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