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21. [Amps] Re: Faraday rotation (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Wed, 9 Feb 2005 08:07:05 -0800 (PST); Rotating polarization on HF, as you surmise, does seem quite fast. In my microscopic city lot, I have managed to implement both a horizontal wire (with tuner, ergo pseudo multi-band) and a multiband; /archives//html/Amps/2005-02/msg00340.html (8,761 bytes)
22. Re: [Amps] AL-1200 vs AL-1500 (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Fri, 25 Feb 2005 09:02:41 -0800 (PST); Searching simply for "Alpha" nets over 1,000 of them. The vast majority of the Alphas listed use either the 3XC400A7 or the 3CX800A7, with a smaller sampling of the 4CX800A and the 3CX1500A7. All ox; /archives//html/Amps/2005-02/msg00810.html (8,905 bytes)
23. Re: [Amps] hp 8405a operations ?? (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Thu, 10 Mar 2005 09:45:09 -0800 (PST); A probe tip to BNC male adapater was HP part number 10218A. A trio of them sold on ebay a few weeks ago for $77. They show up on rare occasion there. Alternate part number for the same part is 10218-; /archives//html/Amps/2005-03/msg00264.html (9,061 bytes)
24. Re: [Amps] hp 8405a operations ?? (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Thu, 10 Mar 2005 09:58:04 -0800 (PST); Steve, that seems to be the final word, then. When I Google'd "10218A" I got some hits, but not many. When I Google "11536A", I find lots of companies selling them used. As you say, the difference is; /archives//html/Amps/2005-03/msg00266.html (12,181 bytes)
25. [Amps] Standby tubes (was: Even more power solid-state amp's) (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Fri, 1 Apr 2005 13:02:34 -0800 (PST); As Joe says, a standby tube is a monumental task. Broadcast-sized rigs have fractional to multiple horsepower blowers, and it's a daunting task to auto-switch anodes, cathodes, etc. So you'd end up; /archives//html/Amps/2005-04/msg00023.html (10,751 bytes)
26. [Amps] Big Rigs (was: Re: Standby tubes was: Even more powersolid-state amp's) (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Mon, 4 Apr 2005 12:22:29 -0700 (PDT); I never had the pleasure of working on truly large hardware, but I've seen it in the flesh. While visiting the Eimac factory in San Carlos, circa 1989, they were testing a 2MW valve. They had a secon; /archives//html/Amps/2005-04/msg00081.html (9,036 bytes)
27. [Amps] Elecraft Amplifier (was Re: Fwd:Re: More Rumors) (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Fri, 22 Apr 2005 09:58:31 -0700 (PDT); Will, If you know anything about the Elecraft people, you would know that they would never "get by" with anything. Everything they do is top notch. It is possible to parallel FETs, but you're asking; /archives//html/Amps/2005-04/msg00454.html (8,857 bytes)
28. Re: [Amps] Vector Voltmeter (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Sat, 14 May 2005 10:27:07 -0700 (PDT); A vector voltmeter is what I used to make my first complex Z measurements at home. I was doing a consulting job, so I could purchase a pair of mini-circuits connectorized directional couplers and ded; /archives//html/Amps/2005-05/msg00169.html (9,129 bytes)
29. Re: [Amps] ARF1505 (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Fri, 20 May 2005 15:46:50 -0700 (PDT); 27.12 MHz is one popular ISM frequency. 13.56 MHz is probably the most popular. Tune any receiver to 13.56 MHz and you'll always hear a carrier, usually a bit wobbly and often with AC hum. Gigawatts; /archives//html/Amps/2005-05/msg00221.html (8,970 bytes)
30. Re: [Amps] push button switches for alpha (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Sun, 10 Jul 2005 12:30:35 -0700 (PDT); An email to "service at alpharadioproducts dot com" should get you the reply you seek. They have never let me down on providing me with answer to such questions, although there might be days of delay; /archives//html/Amps/2005-07/msg00081.html (7,725 bytes)
31. [Amps] Seeking readings from a functioning Ten-Tec 444 (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Fri, 7 Oct 2005 12:41:21 -0700 (PDT); I've got another ham's Ten-Tec 444 amp on the bench, with the supplied 444S power supply. The RF circuitry seems to be behaving; initial results show 550 watts out with 70 watts of drive. But it trip; /archives//html/Amps/2005-10/msg00172.html (7,658 bytes)
32. [Amps] Why preference for 3CPX800A7? (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Wed, 30 Nov 2005 12:36:55 -0800 (PST); The original reason that hams preferred the P version of the tube was the same reason for most of our preferences: price and availability. The tube was used in relatively high quantities in MRI equip; /archives//html/Amps/2005-11/msg00524.html (7,596 bytes)
33. Re: [Amps] Ohmite thick-film resistor L measurement (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Wed, 21 Dec 2005 14:28:19 -0800 (PST); Series L could hardly be easier in this case. You can even use your rig, assuming it's broadbanded. Use the 100 ohm resistor as a load. At low frequencies, it will measure SWR=2:1. Raise the frequenc; /archives//html/Amps/2005-12/msg00290.html (8,416 bytes)
34. Re: [Amps] DXpedition amps (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Thu, 19 Jan 2006 12:05:07 -0800 (PST); Not quite true. The original Hercules I (model 444, ran on 50V, not 12), is no longer supported, due to RF transistor obsolescence. I have one on the bench right now, fortunately the RF devices are f; /archives//html/Amps/2006-01/msg00467.html (6,873 bytes)
35. Re: [Amps] Vegetable oil dummy load (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Tue, 28 Feb 2006 14:00:11 -0800 (PST); IMO, vegetable oil is a marginal idea at best. By unfortunate experience, I have learned that it does several things that are quite unpleasant: 1) Once the vapors are ignited, it seems to alter the r; /archives//html/Amps/2006-02/msg00678.html (10,133 bytes)
36. [Amps] Wanted: Article reprint from Microwaves and RF, October 1987 (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Tue, 11 Apr 2006 14:37:41 -0700 (PDT); W7WKR a few months ago referred us to an article entitled "Designing High-Power Series Inductors And Shunt Capacitors" in "Microwaves & RF" magazine, October 1987, pp 97-98, 101, 103, 105 and 107. I; /archives//html/Amps/2006-04/msg00184.html (7,354 bytes)
37. Re: [Amps] Help with.....any HP / Agilent product (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Thu, 4 May 2006 10:10:51 -0700 (PDT); An HP/Agilent-specific Yahoogroup exists that is an extraordinary resource. Questions range from "where can I get a manual" to "where can I buy service parts" to "how do I make a measurement"? Curren; /archives//html/Amps/2006-05/msg00018.html (8,076 bytes)
38. Re: [Amps] VTVM diodes (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Tue, 16 May 2006 13:41:35 -0700 (PDT); EA52 and EA53 both have online data sheets here: http://tubedata.tigahost.com/tubedata/sheetsE.html Just a simple Google search - the web's a wonderful thing. Here's the hint: anything you want a spe; /archives//html/Amps/2006-05/msg00137.html (7,968 bytes)
39. Re: [Amps] Fiberglass tape (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Tue, 13 Jun 2006 10:33:00 -0700 (PDT); George, the fiberglass tape they're referring to is a fairly thick weave. It's a bit like the stuff used in auto-body repair, but tighter weave. The stuff I have also has a binder of some sort, which; /archives//html/Amps/2006-06/msg00276.html (7,943 bytes)
40. Re: [Amps] help needed (score: 1): Author: Dave Haupt <emailw8nf@yahoo.com>; Date: Fri, 16 Jun 2006 14:08:34 -0700 (PDT); Will, Please go to this Yahoogroup: http://groups.yahoo.com/group/hp_agilent_equipment/ And ask your 8640B questions. Lots of very knowledgeable and very helpful people there, many who've been doing; /archives//html/Amps/2006-06/msg00309.html (7,905 bytes)

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