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201. 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)

202. 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)

203. 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)

204. [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)

205. [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)

206. 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)

207. 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)

208. 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)

209. 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)

210. 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)

211. [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)

212. 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)

213. 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)

214. Re: [Amps] FW: Decent HF directional coupler for RF power meas. (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 7 Dec 2009 21:34:04 -0500
Phil, Do you have a way to check the accuracy of your PowerMaster below 2-watts? Below 1-watt, my PowerMaster deviated substantially from the Alpha 4510, LP-100, and a 200 MHz scope measured across
/archives//html/Amps/2009-12/msg00217.html (8,539 bytes)

215. Re: [Amps] FW: Decent HF directional coupler for RF power meas. (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 8 Dec 2009 10:46:14 -0500
Phil, I just took a look at the PowerMaster's specifications on p. 25 of the most recent on-line manual. For both the 3KW and 10KW couplers, its rated accuracy is specified down to 1-watt. It's a goo
/archives//html/Amps/2009-12/msg00227.html (11,372 bytes)

216. Re: [Amps] "Stacking" power supplies?? how? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 14 Dec 2009 11:41:48 -0500
Steering diodes or other forms of isolation are generally used when paralleling PS outputs. I would first look to the manufacturer's recommendation for strapping. Absent any data, you'll need to ana
/archives//html/Amps/2009-12/msg00322.html (8,641 bytes)

217. Re: [Amps] QSK switching time (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 18 Dec 2009 13:06:53 -0500
Lon, One factor oftentimes neglected when reporting diode-switched, QSK performance is the degree of IMD product produced. For example, the Alpha 86 had approximately 10-15 dB worse 3rd order IMD tha
/archives//html/Amps/2009-12/msg00441.html (11,753 bytes)

218. Re: [Amps] Response the "QSK switching time" (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 18 Dec 2009 19:16:16 -0500
I recently purchased a used QSK-5 to use with an SPE solid-state amp. The electrical concept of the QSK-5 is quite good although mechanically, it can use some improvements. The low-level SO-239 pane
/archives//html/Amps/2009-12/msg00466.html (9,011 bytes)

219. Re: [Amps] Response the "QSK switching time" (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 19 Dec 2009 06:30:10 -0500
Joe, Excellent information. The T/R system I designed with the UM2110 devices replaced the QSK system in a Ten Tec Omni Six where output power is held to 100W and generally, VSWR is much better contr
/archives//html/Amps/2009-12/msg00496.html (14,375 bytes)

220. Re: [Amps] water cooling tips (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 23 Dec 2009 13:29:10 -0500
John, Any idea where off-the-shelf distilled water falls in relation to these figures? I use an Alpha 70V with the better branded water (e.g., Zephyrhills). I once purchased "brand X" water off the
/archives//html/Amps/2009-12/msg00528.html (8,739 bytes)

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