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381. Re: [Amps] {Collins} Understanding Screen Current in a Tetrode (score: 1): Author: donroden@hiwaay.net; Date: Tue, 27 Jan 2015 18:24:05 -0600; Are you saying that we should always tune a grid-driven tetrode linear amp for the maximum screen current allowed by the manufacturer? "Always" is so restrictive. 80% of maxium allowed is sufficient; /archives//html/Amps/2015-01/msg00322.html (8,191 bytes)
382. Re: [Amps] {Collins} Understanding Screen Current in a Tetrode (score: 1): Author: donroden@hiwaay.net; Date: Tue, 27 Jan 2015 18:26:53 -0600; When I ran a pair of 4CX250B's on Two Meters, I tuned the Amp for identical Screen Current, within Tube Limits. 73, Dick, W1KSZ Same here. Don W4DNR _______________________________________________ A; /archives//html/Amps/2015-01/msg00323.html (8,023 bytes)
383. Re: [Amps] {Collins} Understanding Screen Current in a Tetrode (score: 1): Author: donroden@hiwaay.net; Date: Tue, 27 Jan 2015 21:38:47 -0600; The tuning procedure for a 100MHZ 35KW FM Transmitter with a 4CX20,000 tetrode is to tune the loading and tuning for a screen current peak. The tuning is so broad that you can't see the plate dip but; /archives//html/Amps/2015-01/msg00328.html (17,057 bytes)
384. [Amps] Astron Power Supplies (score: 1): Author: donroden@hiwaay.net; Date: Wed, 28 Jan 2015 11:00:56 -0600; Hang a scope on the output. look for ripple or oscillations. Don W4DNR On both of my Astrons, I noticed that the output transistors ran extremely hot. Check to make sure that the thermal compound on; /archives//html/Amps/2015-01/msg00346.html (9,238 bytes)
385. [Amps] LoTW question (score: 1): Author: donroden@hiwaay.net; Date: Thu, 05 Feb 2015 06:36:55 -0600; Does anyone know if K1N has started uploading their logs yet ? Thanks Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm; /archives//html/Amps/2015-02/msg00058.html (6,180 bytes)
386. Re: [Amps] LoTW question (score: 1): Author: donroden@hiwaay.net; Date: Thu, 05 Feb 2015 10:14:11 -0600; Thanks Guys !! I've been off HF since 1988 ( ice storm ) and K1N was my first three QSOs on 10,15, and 20 in over 25 years. Ironic that Monday, I was climbing the tower in 25 degree weather and sleet; /archives//html/Amps/2015-02/msg00066.html (7,551 bytes)
387. [Amps] Thanks !! LoTW question (score: 1): Author: donroden@hiwaay.net; Date: Thu, 05 Feb 2015 10:15:13 -0600; Thanks Guys !! I've been off HF since 1988 ( ice storm ) and K1N was my first three QSOs on 10,15, and 20 in over 25 years. Ironic that Monday, I was climbing the tower in 25 degree weather and sleet; /archives//html/Amps/2015-02/msg00067.html (7,412 bytes)
388. [Amps] Pride DX-300 (score: 1): Author: donroden@hiwaay.net; Date: Wed, 18 Feb 2015 16:09:40 -0600; What is the DEAL ???? Single tube 4CX250 selling on Ebay for over $600 !! eBay item number: 261774202979 I'd like one to check a shoe-box full of the golfballs, but I wonder who is buying these thing; /archives//html/Amps/2015-02/msg00111.html (6,570 bytes)
389. Re: [Amps] Pride DX-300 (score: 1): Author: donroden@hiwaay.net; Date: Wed, 18 Feb 2015 19:58:14 -0600; I was looking at one amplifier, 301530993002, but had 2 tubes "250Bs" which I assume means 4CX250B tubes. And has a youtube video showing that it produces 4 kW when he whistles into the mic. 4000 wat; /archives//html/Amps/2015-02/msg00114.html (7,253 bytes)
390. Re: [Amps] GS-35b fully-submersed oil cooling (score: 1): Author: donroden@hiwaay.net; Date: Wed, 18 Mar 2015 23:53:45 -0500; A properly designed system would have a sump where the water would naturally separate from the oil, and a valve to drain the small amounts of water collected over time. Don W4DNR Basically, I think o; /archives//html/Amps/2015-03/msg00043.html (8,689 bytes)
391. Re: [Amps] oil cooling.. (score: 1): Author: donroden@hiwaay.net; Date: Mon, 06 Apr 2015 16:14:48 -0500; I'm torn between Royal Purple or Amsoil on the motorhead side, or LouAna peanut oil on the culinary side. Maybe a sponsorship deal ... ?? Don W4DNR _______________________________________________ Amp; /archives//html/Amps/2015-04/msg00048.html (6,494 bytes)
392. [Amps] Two Tone Testing (score: 1): Author: donroden@hiwaay.net; Date: Fri, 10 Apr 2015 08:43:18 -0500; My search engine is running out of compression... I'm looking for a high peak / low average duty cycle test tone . Somewhere ...... I saw reference to a triangle generator rather than a sine wave gen; /archives//html/Amps/2015-04/msg00056.html (6,575 bytes)
393. Re: [Amps] Oil v water cooling (score: 1): Author: donroden@hiwaay.net; Date: Fri, 17 Apr 2015 16:14:09 -0500; Then the negative HV is applied to a floating cathode/filament with isolated heater transformer. Yah..... REALLY isolated !!!! Don ( remembering the old GE "Austin Ring" filament transformers ) W4DNR; /archives//html/Amps/2015-04/msg00122.html (6,812 bytes)
394. Re: [Amps] Time for New Power Meter (score: 1): Author: donroden@hiwaay.net; Date: Sat, 02 May 2015 08:26:35 -0500; Why are so many hams obsessed with accurate power measurements? Go figure. I wouldn't say obsessed......... curious maybe. +-10% is more than enoughfor me. I do like the ruggedness of the Bird 43. I; /archives//html/Amps/2015-05/msg00010.html (7,728 bytes)
395. Re: [Amps] Time for New Power Meter (score: 1): Author: donroden@hiwaay.net; Date: Sun, 03 May 2015 15:10:37 -0500; Not meaning to quote anyone in particular here, but what is this insecure fixation with watt meters? Ask MFJ ... They sell a HUGE meter. huge meters = huge signal right ??? I would just want consiste; /archives//html/Amps/2015-05/msg00025.html (8,530 bytes)
396. [Amps] Hot Wire ( not the website ) (score: 1): Author: donroden@hiwaay.net; Date: Sun, 03 May 2015 16:48:18 -0500; If you can't find such a hot wire meter, they are easy enough to make! Pictures... we need pictures. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com h; /archives//html/Amps/2015-05/msg00029.html (8,198 bytes)
397. Re: [Amps] Time for New Power Meter (score: 1): Author: donroden@hiwaay.net; Date: Sun, 03 May 2015 21:09:17 -0500; Yes, that is *exactly* what Bird meant. Probably what the Bird legal department meant. They ( Bird Watt Meters ) are much closer than that. Don W4DNR _______________________________________________ A; /archives//html/Amps/2015-05/msg00038.html (9,122 bytes)
398. [Amps] Rigs I have owned (score: 1): Author: donroden@hiwaay.net; Date: Sat, 23 May 2015 15:33:32 -0500; DC to Daylight !! I keep one along side of my Collins S-line. Fine thirty year old rig. A superb noise blanker. Don W4DNR _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2015-05/msg00174.html (7,405 bytes)
399. Re: [Amps] Yaesu Orange Button (score: 1): Author: donroden@hiwaay.net; Date: Sun, 24 May 2015 19:53:55 -0500; I'm Blue ..... Oh so Blue Cause I got the Orange Button Blues. Yodlelede Yodleleddeoooooooooooo. W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lis; /archives//html/Amps/2015-05/msg00192.html (7,314 bytes)
400. Re: [Amps] Real danger to use the ORANGE button (score: 1): Author: donroden@hiwaay.net; Date: Mon, 25 May 2015 12:31:37 -0500; Shakespeare was a Ham To "B", or not to "B" : that is the question: Whether ?tis nobler in the mind to suffer The slings and arrows of outrageous IMD, Or to lower bias against a sea of DXers, And by; /archives//html/Amps/2015-05/msg00199.html (8,630 bytes)

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