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141. Re: [Amps] Drake L-7 failure...amp vs L7-PS power supply? (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Fri, 14 Nov 2003 12:27:42 -0800; Torrey, Did you hear a loug band on both attempts, or just on the first attempt. How about the visible arcing, did you see it on both attempts? How about meter readings? When the close the key line w; /archives//html/Amps/2003-11/msg00181.html (10,626 bytes)
142. Re: [Amps] Fw: Parts needed for Drake L-7 amp (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 19 Nov 2003 22:51:49 -0800; Torrey, You should be able to remove C47 without any detrimental effects. I had one fail in my L7. When I removed the capacitor and then swept plate choke with the MFJ-269, the only resonance I saw w; /archives//html/Amps/2003-11/msg00297.html (10,167 bytes)
143. Re: [Amps] amp. Pi-L tuning question (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 26 Nov 2003 01:29:22 -0800; And if you don't want to go to the trouble of building or buying a return loss bridge, you can also use one of those hand held impedance analyzer's like the Autek VA-1, MFJ-269, or Tempo Research HF-; /archives//html/Amps/2003-11/msg00370.html (12,616 bytes)
144. Re: [Amps] 220V service for amplifier (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 3 Dec 2003 22:50:31 -0800; Jason, I ran into this problem with the Henry 2K-D that was donated to our local club station. Even when operated from a 240VAC circuit, the Henry still requires 120VAC from the mains to run the blow; /archives//html/Amps/2003-12/msg00041.html (11,813 bytes)
145. Re: [Amps] Re: SB-220 on 220V (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 6 Dec 2003 09:04:14 -0800; I agree with Dave. I recently wired an SB-221 for 240V service. It was wired exactly as Dave describes (third wire is chassis to AC mains safety ground connection). There is no connection between the; /archives//html/Amps/2003-12/msg00093.html (9,491 bytes)
146. Re: [Amps] Re: SB-220 on 220V (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 7 Dec 2003 16:43:44 -0800; Roughly Zero Volts DC - since the neutral and safety ground are connected together at the AC mains service entrance. If you want to do things per NEC, you aren't supposed to let the chassis connectio; /archives//html/Amps/2003-12/msg00118.html (8,636 bytes)
147. Re: [Amps] Big Solid State Power Amplifiers (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 17 Dec 2003 07:22:28 -0800; The 90% efficiency thing actually make some sense from a weight standpoint if you consider amps intended for DXpedition style operation. Of course this assumes that all of the circuitry needed to lin; /archives//html/Amps/2003-12/msg00288.html (13,788 bytes)
148. Re: [Amps] OPINIONS PLEASE (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Fri, 19 Dec 2003 22:34:39 -0800; We have a couple AL-82's at the local club station, Louie. Recently I got to use one of them in contest service (ARRL 160 and CQ Worldwide CW Contests). So far, I am fairly impressed. The amplifier i; /archives//html/Amps/2003-12/msg00314.html (10,024 bytes)
149. [Amps] Alpha 78 B- Resistor (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 21 Jan 2004 23:05:28 -0800; While I was in the process of installing a new bandswitch in our club's Alpha 78, I noticed that the plate overcurrent shunt resistor R111 was cracked into two pieces, and that the G-10 PWB underneat; /archives//html/Amps/2004-01/msg00226.html (7,404 bytes)
150. Re: [Amps] Alpha 78 B- Resistor (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 24 Jan 2004 22:27:18 -0800; Even if I replace the 25 ohm wirewound with a globar style resistor, it is still shunted with R112 and R113 which for a voltage divider which drives the plate overcurrent relay circuit. These are sma; /archives//html/Amps/2004-01/msg00267.html (11,627 bytes)
151. Re: [Amps] A Crying Shame (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 29 Jan 2004 22:33:56 -0800; I dunno about FEDEX, but I had a room mate in college who worked part time unloading trucks for UPS. At that time (and I assume it's still the case) they were under tremendous pressure to maintain a; /archives//html/Amps/2004-01/msg00352.html (9,678 bytes)
152. Re: [Amps] A CALL TO ARMS ! (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Fri, 13 Feb 2004 00:20:09 -0800; Very doubtful, Bill. It's already failed in many places in Europe. The bandwidth it can provide is very limited, especially as the subscriber density gets high (they only have about 27 MHz of bandwi; /archives//html/Amps/2004-02/msg00094.html (9,485 bytes)
153. Re: [Amps] 20kw Dummy load? (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 23 Sep 2004 19:58:15 -0700; Has anyone tried submerging MFJ Cantenna's into a water tank. I was thinking of building up some power dividers and running 4 of those cans in parallel to make a cheap high power load. One can will t; /archives//html/Amps/2004-09/msg00436.html (9,671 bytes)
154. Re: [Amps] 20kw Dummy load? (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Fri, 24 Sep 2004 06:16:46 -0700; No, not directly, but VSWR didn't appear to change appreciably when I ran 1 minute key down test last week. This suggests that the resistor value remains reasonably stable. The oil gets damn hot, how; /archives//html/Amps/2004-09/msg00445.html (8,891 bytes)
155. Re: [Amps] Non-inductive resistors (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 26 Sep 2004 18:57:04 -0700; Will, Globar resistors are "bulk ceramic" types. That means that the ceramic body isn't just a form for a thin film resistive trace to be deposited on the form. To the contrary, in the case of a glob; /archives//html/Amps/2004-09/msg00462.html (15,238 bytes)
156. Re: [Amps] Non-inductive resistors (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Mon, 27 Sep 2004 22:17:07 -0700; Interesting stuff, Will. Like I say, I am sure that these techniques work, but to what extent is unclear. I gave it some more thought, and it occured to me that if you could control the characteristi; /archives//html/Amps/2004-09/msg00468.html (12,604 bytes)
157. Re: [Amps] Question about Marconi amp filter board (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 2 Oct 2004 07:10:15 -0700; Assuming these are low-pass filters Webb, then tying them together in parallel will not work. At the lower frequencies, the high-band LPFs will bypass the rejection of the low-band LPFs thereby rende; /archives//html/Amps/2004-10/msg00013.html (8,187 bytes)
158. Re: [Amps] Power metering in linears (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 7 Oct 2004 18:59:28 -0700; Hi Marv, Is the configuration you are speaking of the one that is so commonly used in CATV "tap" couplers (I don't have the Sabin book here)? That configuration can be easily made to produce flat cou; /archives//html/Amps/2004-10/msg00082.html (10,095 bytes)
159. Re: [Amps] Power metering in linears (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 10 Oct 2004 21:10:26 -0700; Yes that's it, Marv, except that I think you meant to say that the single "turn" primary of the first transformer is connected between "ports 1 & 2" instead "1 & 4". See figure 2 of the following doc; /archives//html/Amps/2004-10/msg00139.html (9,472 bytes)
160. Re: [Amps] Ebay sales (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 13 Oct 2004 01:41:14 -0700; This may be applicable: http://nobelprize.org/economics/laureates/1994/ Mike, W4EF................................................. _______________________________________________ Amps mailing list A; /archives//html/Amps/2004-10/msg00197.html (7,901 bytes)

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