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1. Re: [Amps] Drake L4 Slow Relay (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 21 Nov 2009 18:58:51 -0500; He's discussing the time from Tx back to Rx -- not a missing transmitted "dit." Again Mike, to overcome that problem requires setting Semi-Break-In on the transceiver to a faster value. However, real; /archives//html/Amps/2009-11/msg00222.html (10,292 bytes)
2. Re: [Amps] Drake L4 Slow Relay (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 20 Nov 2009 16:41:30 -0500; Mike, Since the L4 by itself is not a QSK amp, I'm assuming you're running the IC-765 in Semi-Break-In mode with the L4? That would explain the T to R lag. In any case, one option is to use an Amerit; /archives//html/Amps/2009-11/msg00215.html (7,521 bytes)
3. [Amps] QSK-5 Improvements (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 15 Nov 2009 19:21:22 -0500; I recently acquired a used Ameritron QSK-5 for use with a solid-state amp. In preparation for use, I noted that the RCA control jacks were loose. In the event the KEY 2 connector become loose, hot sw; /archives//html/Amps/2009-11/msg00181.html (7,069 bytes)
4. Re: [Amps] TL922 Power Plugs (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 4 Nov 2009 21:27:19 -0500; Not to confuse matters, but as of Jan 1, 2002, the NEC requires AFCI devices installed for bedroom receptacle outlets in new home construction. So, if the shack is located in the bedroom of a new ho; /archives//html/Amps/2009-11/msg00056.html (9,286 bytes)
5. Re: [Amps] TL922 Power Plugs (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 4 Nov 2009 10:48:11 -0500; Carl, Assuming it's not an autotransformer, then it seems that Sec 250.24 may be applicable if the one or both of the stepping transformers are "outside," in which case the serving CT is grounded to; /archives//html/Amps/2009-11/msg00048.html (14,608 bytes)
6. Re: [Amps] TL922 Power Plugs (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 4 Nov 2009 10:00:21 -0500; Gary, Pre-2008 NEC, that's allowable as long as there is no other metallic path between structures. It still appears to be an allowable exception on some existing wiring with conditions. Myself, I w; /archives//html/Amps/2009-11/msg00046.html (9,724 bytes)
7. Re: [Amps] TL922 Power Plugs (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 4 Nov 2009 06:43:56 -0500; For that to occur with both the neutral and ground opening, the grounded equipment chassis needs to find an alternate neutral path through other connections (e.g., grounded PL-259, RCA jacks, BNC, a; /archives//html/Amps/2009-11/msg00043.html (10,606 bytes)
8. Re: [Amps] TL922 Power Plugs (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 3 Nov 2009 21:21:23 -0500; See NEC 250.32(A) and (B). Since your 3-wire system is existing, the 4-wire requirement beginning with the 2008 NEC likely does not apply -- but may under your local code. New detached structure wir; /archives//html/Amps/2009-11/msg00031.html (10,417 bytes)
9. [Amps] Ameritron QSK-5 (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 2 Nov 2009 07:48:58 -0500; I recently purchased an SPE Expert 1K-FA solid-state amp to augment my two Alphas. However, despite the manufacturer's claim that the amp is "Full QSK," in fact the amp's T/R structure is one of the; /archives//html/Amps/2009-11/msg00010.html (7,566 bytes)
10. [Amps] B&W Coil Sets Wanted (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 29 Aug 2009 10:56:17 -0400; Looking for BC-610 PA output coils. I believe these came in sets between 2-18 MHz. So, probably 3 or 4 coil sets in total. Here's a link to the photo of my homebrew link tuner with the 80m coil. This; /archives//html/Amps/2009-08/msg00599.html (8,468 bytes)
11. Re: [Amps] parasitic oscillation techniques (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 24 Aug 2009 18:08:05 -0400; Apologies if I've repeated this story in the past... There was a wave of contaminated Eimac 8877s that preceded the 1985 event. It nearly cost me my college job when I was working at a small FM stat; /archives//html/Amps/2009-08/msg00466.html (11,681 bytes)
12. Re: [Amps] TRANSFER SWITCH (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 12 Aug 2009 11:07:16 -0400; And...in the U.S., at the utility company transformer's secondary center-tap. Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting; /archives//html/Amps/2009-08/msg00306.html (8,167 bytes)
13. Re: [Amps] TRANSFER SWITCH (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 12 Aug 2009 11:09:27 -0400; And...in the U.S., at the utility company transformer's secondary center-tap. Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting; /archives//html/Amps/2009-08/msg00287.html (7,631 bytes)
14. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 10 Aug 2009 09:39:59 -0400; Right, as long as only the wiring is "super-sized" in that application But to Carl's point, if the 240VAC demand is > 20A, then pricing of 30A material goes up on a seemingly exponential curve. When; /archives//html/Amps/2009-08/msg00220.html (9,852 bytes)
15. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 9 Aug 2009 20:33:41 -0400; I see where Jim Smith had answered the last sentence above with this... "True, but the NEC makes an exception for 15 ampere general purpose receptacles on a 20 ampere circuit." Paul, W9AC __________; /archives//html/Amps/2009-08/msg00184.html (8,883 bytes)
16. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 9 Aug 2009 20:26:35 -0400; Upgrading the breaker to 20A is not an issue with 12/2 w/Ground since it's rated for 120VAC/20A service. Myself, I would then upgrade the receptacle to one rated for 20A. The question is whether or; /archives//html/Amps/2009-08/msg00181.html (8,845 bytes)
17. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 9 Aug 2009 19:59:08 -0400; If I was pretty sure that my amp powering needs didn't change in the future and had no issue with a slightly more invasive approach to modifying the PS (versus lifting neutral from ground), I would; /archives//html/Amps/2009-08/msg00178.html (9,294 bytes)
18. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 9 Aug 2009 15:12:36 -0400; Excellent advice. It's been a while since I've reviewed that section of the NEC, but I suspect over-sizing the wire size is fine, but I would never oversize the breaker current rating, nor would I o; /archives//html/Amps/2009-08/msg00166.html (9,022 bytes)
19. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 9 Aug 2009 14:32:14 -0400; That's a problem and needs correction. It wasn't a safe design practice in 1955 and it's just as much a safety concern in 2009. Here's why: If the current-carrying neutral+ground lead faults with a; /archives//html/Amps/2009-08/msg00162.html (9,381 bytes)
20. Re: [Amps] Grounded Grid (Screen) 4CX250B power gain (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 21 Jul 2009 14:11:56 -0400; I did a "double-take" the first time I had seen one since Tokyo Hy-Power is more commonly known as a SS amp manufacturer. What's really got me excited is the use of adaptive pre-distortion in the ne; /archives//html/Amps/2009-07/msg00240.html (8,952 bytes)

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