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1. [AMPS] The New W3NQN 20 Meter 2KW Low Pass Filter (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Sun, 26 Sep 1999 18:43:01 -0400; Hi Gang, This weekend the W3LPL crew completed it's annual shakedown cruise in the CQ WW RTTY contest with a full bore multi-multi entry. 48 hours of RTTY at 1500 watts does tend to shake out the bug; /archives//html/Amps/1999-09/msg00262.html (8,763 bytes)
2. [AMPS] New 3-1000Z on Ebay (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Sat, 10 Apr 1999 11:13:10 -0400; http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=89142454 -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.; /archives//html/Amps/1999-04/msg00218.html (6,759 bytes)
3. [AMPS] Input Tuned Circuits with Powdered Iron Toroids (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Mon, 8 Feb 1999 22:32:41 -0500; This rainy weekend I decided to replace the old National XR-50 slug tuned coils in the input pi-network tuned circuits of my 25 year-old monoband 3-1000Z amplifiers with powdered iron toroids. The pr; /archives//html/Amps/1999-02/msg00262.html (10,925 bytes)
4. [AMPS] Input Tuned Circuits with Powdered Iron Toroids (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Mon, 8 Feb 1999 23:06:21 -0500; Jon, Excellent question! A class B amplifier produces many harmonics as it switches from conducting to non-conducting, and the input tuned circuit must provide an excellent input termination impendan; /archives//html/Amps/1999-02/msg00266.html (10,425 bytes)
5. [AMPS] More Input Tuned Circuits with Powdered Iron Toroids (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Wed, 10 Feb 1999 22:09:42 -0500; Several readers asked that I provide an update to my 3-1000Z pi-network input tuned circuit chart after I had completed the replacement of the National XR-50 slug tuned coil with a powdered iron core; /archives//html/Amps/1999-02/msg00307.html (8,562 bytes)
6. [AMPS] RE: Micas and DC (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Fri, 12 Feb 1999 07:24:34 -0500; I've been using twelve 0.02 uF micas in six monoband 3-1000Z amplifiers for over 25 years. After more than 500,000 DX QSO's they operate like they are eager for the next 500,000. 73 Frank W3LPL donov; /archives//html/Amps/1999-02/msg00326.html (7,642 bytes)
7. [AMPS] Blower (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Sat, 27 Feb 1999 14:18:07 -0500; Hi Dave, Don't forget that you will get much airflow (CFM) for the same wheel size when u reduce the speed to 1700, you will need a much larger wheel. My Dayton Electric blowers have 3 13/16" diamete; /archives//html/Amps/1999-02/msg00692.html (7,749 bytes)
8. [AMPS] Re: Blower (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Sun, 28 Feb 1999 08:13:18 -0500; Hi Dave, Three of my 3-1000Z amps use an older Dayton equivalent of the 2870 rpm 4C443, the other three amps use the equivalent of the 3160 rpm 4C446. The 4C443 is significantly quieter than the 4C44; /archives//html/Amps/1999-02/msg00698.html (9,143 bytes)
9. [AMPS] Wanted: 3-1000Z New or Used (score: 1): Author: donovanf@erols.com (Frank Donovan W3LPL); Date: Sun, 10 Jan 1999 19:15:30 -0500; After over 500,000 DX QSOs, its time to rejuvinate the W3LPL monoband KW amplifiers! I'm looking for one or more, new or used, 3-1000Z tubes. I'm willing to pay a 20% finders fee for anyone who helps; /archives//html/Amps/1999-01/msg00132.html (7,135 bytes)

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