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1. [Amps] KW Linear for FT-817 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Wed, 17 Jul 2002 11:06:33 -0400; It has been some years since I worked at ITT's Mackay Marine division. But I know that back in the 80s there were a few commercial HF amps that were designed to be driven by 100 mW exciters. Mackay (; /archives//html/Amps/2002-07/msg00249.html (9,847 bytes)
2. [Amps] al-1500 parasitic?? or some other problem? (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Wed, 15 May 2002 16:51:28 -0400; I've seen similar things. All the more reason to use non-conductive guy cable. Granted, it's not cheap, but I would never go back to steel guy wire. Remote antenna switches are also sometimes guilty; /archives//html/Amps/2002-05/msg00224.html (9,524 bytes)
3. [Amps] Ameritron manuals (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Thu, 30 May 2002 21:18:09 -0400; I couldn't disagree more. Either some web design firm is leading Ameritron down the garden path, or they're wearing blinders. In my company (which does not sell products via the web) any requests sub; /archives//html/Amps/2002-05/msg00474.html (9,194 bytes)
4. [AMPS] FS:ARRL-002 Hipersil Xfmr (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Mon, 4 Feb 2002 08:57:25 -0500; Note: I sent my question to Rich via private email. It was Rich's choice to send his response to the reflector. Even so, Rich, you dodged my question. And in so doing, answered it. Regards, Doug, K4D; /archives//html/Amps/2002-02/msg00048.html (11,068 bytes)
5. [AMPS] AL1500 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Mon, 03 Dec 2001 20:16:38 -0500; The ITT Mackay Marine MRU-60 was a shipboard transmitter manufactured in the 1980s. It contained a 100 mW solid state exciter, a broadband 100w solid state driver, and an 8877 PA. As I recall it cove; /archives//html/Amps/2001-12/msg00052.html (8,618 bytes)
6. [AMPS] AL1500 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Tue, 04 Dec 2001 00:53:12 -0500; Well, let's see... it made a big CLUNK when the contactors kicked in, then the high pitched whine of the exciter/driver fans could be heard, followed by the sound of the blower in the PA coming up t; /archives//html/Amps/2001-12/msg00066.html (8,917 bytes)
7. [AMPS] pair 572Bs $70 shipped or trade (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Thu, 20 Dec 2001 15:46:19 -0500; Indeed, even restricting the bandwidth of a voice signal to 2000 Hz has been shown to reduce intelligibility by more than 50%. In this case, however, intelligibilty is nearly always measured by the; /archives//html/Amps/2001-12/msg00405.html (9,012 bytes)
8. [AMPS] current rating (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Fri, 28 Dec 2001 12:08:12 -0500; I adapted Rich's circuit for use in an SB-200 using this winding. It works splendidly. As I recall the two new relays draw less current than the original SB-200 relay. I used it for over a year befor; /archives//html/Amps/2001-12/msg00502.html (7,449 bytes)
9. [AMPS] TS-940 and SB-200 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Wed, 28 Nov 2001 11:32:18 -0500; I've had a TS-850S for 7 years now and have been using it with SB-200 and SB-220 amps with no problems. Have I just been lucky? Should I expect the amp keying relay to die any day now? 73, Doug, K4D; /archives//html/Amps/2001-11/msg00462.html (7,751 bytes)
10. [AMPS] SB-220 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Wed, 3 Oct 2001 13:57:24 -0400; I can't tell from your comment whether you're serious or not. Surely you must know that the vast majority of people who buy unbuilt Heathkits have no intention of ever building them. And even though; /archives//html/Amps/2001-10/msg00047.html (8,554 bytes)
11. [AMPS] Re: 8k ultra/ "tuned input" (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Thu, 18 Oct 2001 11:03:56 -0400; Rich, What was the name of the engineer who made this statement? Was he actually an engineer or just a sales guy doing booth duty? Doug, K4DSP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submis; /archives//html/Amps/2001-10/msg00374.html (8,524 bytes)
12. [AMPS] A Clone of an SB-220 by SBE (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Wed, 24 Oct 2001 10:02:36 -0400; Looking at the pictures gives me the impression that this amp does not use the same split-chassis cooling method found in the SB-220. It might, but it's not obvious from the photos. Does anyone know; /archives//html/Amps/2001-10/msg00455.html (8,470 bytes)
13. [AMPS] True Or Not True #2 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Thu, 6 Sep 2001 14:10:46 -0400; When sending data via HF/MF, undoubtedly. I have seen Bit Error Rate (BER) figures that proved it. If you're referring to 75m SSB transmissions, I doubt it. Most of the SSB transmissions I hear on 7; /archives//html/Amps/2001-09/msg00078.html (8,051 bytes)
14. [AMPS] "Tetrodes with handles" (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Fri, 28 Sep 2001 16:22:17 -0400; See http://home.nc.rr.com/thehallway/ and look down near the bottom of the page. The tubes really do have handles on them. 73, Doug, K4DSP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissio; /archives//html/Amps/2001-09/msg00479.html (7,224 bytes)
15. [AMPS] good news, Ham Radio Magazine... now on CD Rom (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Sat, 07 Jul 2001 09:06:25 -0400; I was fortunate enough to be given a complete collection of Ham Radio magazines by a friend of mine. I have found them to be a wealth of information, with many good articles on amplifier design and c; /archives//html/Amps/2001-07/msg00102.html (10,116 bytes)
16. [AMPS] ALC (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Wed, 2 May 2001 16:07:04 -0400; I keep hearing how bad the 706 is - I don't know if there's a difference in TX overshoot between the 706, 706Mk2, and 706Mk2G. I had a look at mine back in January of this year. Here's what I wrote; /archives//html/Amps/2001-05/msg00036.html (8,380 bytes)
17. [AMPS] blower (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Fri, 4 May 2001 10:17:09 -0400; ex·pert (ekspûrt) n. 1.A person with a high degree of skill in or knowledge of a certain subject. Rich, you keep bringing this up. The fact is that there are a lot of experts on this re; /archives//html/Amps/2001-05/msg00048.html (7,892 bytes)
18. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Thu, 04 Jan 2001 22:09:04 -0500; All this talk prompted me to take my storage scope home tonight and have a look at the rigs I use. Here's what I saw at 3.5 MHz as measured with a 2Gs/sec digital scope: On my Icom IC-706Mk2G, approx; /archives//html/Amps/2001-01/msg00155.html (9,872 bytes)
19. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Thu, 04 Jan 2001 22:19:25 -0500; Some clarifications to my previous post: I was using a 13.8v 50A power supply, well regulated. I stated that the The output power on the 706 returns to nominal after about 2.5 mS. That's 2.5 mS after; /archives//html/Amps/2001-01/msg00156.html (10,733 bytes)
20. [AMPS] Output Pulse from ICOM 706 (score: 1): Author: doug@nc.rr.com (Doug Hall); Date: Wed, 17 Jan 2001 09:15:46 -0500; You have it backwards - FIR filters are phase linear, and have a fixed group delay, whereas IIR filters do not. IIR filters mimic the operation of analog filters (Butterworth, elliptical, etc.) but; /archives//html/Amps/2001-01/msg00415.html (8,970 bytes)

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