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301. Re: [Amps] Alpha vs Henry (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 09:44:36 -0400; To Jim's point, I forgot that I had also changed the plate choke in my 77Dx to a B&W 802. Actually, Dick Byrd, N4UQ rewound the old #800. At one time, he offered a trade-in service where he would kee; /archives//html/Amps/2011-04/msg00091.html (13,536 bytes)
302. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 12:03:50 -0400; Probably the larger issue in the 3-wire 120/240V configuration (e.g., unmodified Alpha 70/77 series) is if neutral and ground are tied at the equipment -- and neutral accidentally lifts above ground; /archives//html/Amps/2011-04/msg00104.html (10,308 bytes)
303. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 13:22:15 -0400; Right, Jim. I should have placed a caveat that it's the only right way without modifying the amp. Knowing most Alpha owners, they would already scoff at what I've done to my 77Dx amp! Paul, W9AC ____; /archives//html/Amps/2011-04/msg00111.html (11,023 bytes)
304. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 14:24:18 -0400; For point of clarification on the Alpha 77 series, I had forgotten that the 120V blower is actually in series with the plate supply primary such that the blower forces more air as the load increases.; /archives//html/Amps/2011-04/msg00116.html (12,739 bytes)
305. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 16:32:25 -0400; Gary, Excellent clarification. Looking at the schematic, the 50V primary shows as being the only primary "coupled" to the plate secondary. I put that in quotes because it's easy to infer the incorrec; /archives//html/Amps/2011-04/msg00133.html (15,790 bytes)
306. Re: [Amps] 4 wire 240VAC service? What to do now? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 5 Apr 2011 07:58:36 -0400; I realize this is drifting OT but I had a situation several years ago where an isolation transformer was used at a remote building. In that case, I believe the NEC addresses the distribution as a se; /archives//html/Amps/2011-04/msg00159.html (10,792 bytes)
307. Re: [Amps] Where is power measured ? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 6 Apr 2011 08:52:11 -0400; 97.3(b)(6) and 97.313(b) require that maximum allowable power occur at the transmitter output (aka, "TPO"). I prefer it that way rather than the FCC start regulating power based on ERP or EIRP. Paul,; /archives//html/Amps/2011-04/msg00224.html (7,301 bytes)
308. Re: [Amps] Alpha vs Henry (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 6 Apr 2011 18:48:00 -0400; I've never run into any 160m toroid heating issues with my 70V. It's runs approximately the same class of service as the 77. However, I did have a an RF arc issue that required placing the toroids ab; /archives//html/Amps/2011-04/msg00259.html (14,149 bytes)
309. Re: [Amps] Where is power measured ? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 7 Apr 2011 07:28:24 -0400; In the U.S., Sec. 73.61(a) requires that directional AM stations monitor FS at monitor points as often as necessary to maintain compliance. To an FCC inspector, that means regular, periodic measurem; /archives//html/Amps/2011-04/msg00276.html (8,668 bytes)
310. Re: [Amps] Hammond HL-2000A (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 28 May 2011 12:38:40 -0400; Jerome, Myself, I would place the value within the range of a Drake L-4B in similar condition. Mostly common construction, and 80m-10m only. I believe the Hammond is mostly identical to the Viewstar; /archives//html/Amps/2011-05/msg00266.html (7,733 bytes)
311. Re: [Amps] Hammond HL-2000A (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 28 May 2011 13:22:02 -0400; True, the color matching scheme could slightly inflate the value among '380 owners -- for they know not what they own. :-) I owned two HF-380s back in the early '90s. I held on to Barry Goldwater's; /archives//html/Amps/2011-05/msg00269.html (8,413 bytes)
312. Re: [Amps] Should a blower run after amp shutdown? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 3 Jun 2011 11:21:14 -0400; As I recall, both Collins and Continental included an SCR-based ramped filament regulator in the majority of their high-power designs. During my college years, I worked at a station that used this d; /archives//html/Amps/2011-06/msg00026.html (10,006 bytes)
313. [Amps] HV Oil Filter Cap (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 4 Jun 2011 09:45:16 -0400; Looking for sources of a HV filter cap as an upgrade to my Alpha 70V and 77Dx amps. Specifically, I'm looking for something close to 35uF @ 4500VDC but as a direct drop-in replacement. That means the; /archives//html/Amps/2011-06/msg00040.html (6,562 bytes)
314. Re: [Amps] antenna relay connections (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 19 Jun 2011 00:26:31 -0400; I've been using 1KV Silicone test lead wire. http://www.testpath.com/Categories/Silicone-Test-Lead-Wire-3086.htm I imagine that the 13 Gauge wire (651 micro-strands) would work commensurate with the; /archives//html/Amps/2011-06/msg00233.html (7,388 bytes)
315. Re: [Amps] WTB: PL259 crimp RG8x (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 26 Aug 2011 08:16:57 -0400; Try and apply for an account. I set one up with Tessco a few years ago when I was doing some part-time consulting work. Account holders will often see significant discounts applied to pricing. I gene; /archives//html/Amps/2011-08/msg00188.html (10,113 bytes)
316. Re: [Amps] You want 47ohm 2 watt carbons? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 14 Sep 2011 07:56:14 -0400; A better and less expensive choice for most applications that require high peak surge capacity and low inductance is the Ohmite "OY" ceramic composition type. USD $1.28 in small quantities (47 ohm @; /archives//html/Amps/2011-09/msg00081.html (7,782 bytes)
317. Re: [Amps] RF in the Audio (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 25 Sep 2011 17:32:27 -0400; "As noted by Roy Lewallen, W7EL,[2] putting a choke balun on the input of an unbalanced tuner to drive a balanced line is useless. It introduces a ``hot'' tuner case which must be isolated with no be; /archives//html/Amps/2011-09/msg00214.html (10,591 bytes)
318. Re: [Amps] RF in the Audio (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 26 Sep 2011 09:58:15 -0400; That's an important but often difficult step for most folks. Myself, I've been tempted to proclaim the superior performance of my open line dipole with its symmetrically balanced remote ATU. The tru; /archives//html/Amps/2011-09/msg00223.html (9,416 bytes)
319. Re: [Amps] Cooling Fan (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 26 Sep 2011 15:51:07 -0400; David, Since you know the mounting centers, the only remaining items are: (1) CFM rating; and (2) direction of rotation relative to the hub (i.e., intake or output over struts). You can determine the; /archives//html/Amps/2011-09/msg00227.html (8,500 bytes)
320. Re: [Amps] RF in the Audio (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 27 Sep 2011 07:45:57 -0400; Good points Jim. However, if the line was truly balanced for the entire distance of the open-line feeder, then the antenna portion, and its influence, is already taken into consideration. To your po; /archives//html/Amps/2011-09/msg00230.html (9,354 bytes)

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