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81. [AMPS] 87A Ip Meter Problem (long) (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Mon, 15 Mar 1999 19:19:08 -0500; I spoke with Carl at the factory today and he's in agreement that the most likely culprit is the op amp. As soon as he has an 87A available he's going to take some measurements around the op amp so; /archives//html/Amps/1999-03/msg00328.html (9,234 bytes)
82. [AMPS] Instant On (was CW amplifier progress) (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Wed, 17 Mar 1999 10:06:17 -0500; I think I might hold the record for the most complicated solution to the warmup time problem. I used to have the shack in the basement. In order to be able to get DX spots without living in the basem; /archives//html/Amps/1999-03/msg00387.html (10,473 bytes)
83. [AMPS] strange idling current (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Wed, 17 Mar 1999 22:31:38 -0500; Did the next best thing: got voltage and resistance readings from AlphaPower. All readings agree within reasonable tolerance, except output from the op amp. For example, I have 312 mV on the inverti; /archives//html/Amps/1999-03/msg00393.html (11,934 bytes)
84. [AMPS] Instant ON.. (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Thu, 18 Mar 1999 20:04:29 -0500; The answer is to pretune the amp when each band is dead and have a chart with the presets taped to the front of the amp. For amps without tuning numbers, small pencil marks or pieces of masking tape; /archives//html/Amps/1999-03/msg00451.html (8,659 bytes)
85. [AMPS] AL-1200 comments please (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Fri, 19 Mar 1999 00:37:30 -0500; I'm looking for some comments on the Ameritron AL-1200, especially from owners of the most recent production runs. Specifically, any info on the following would be much appreciated: 1. How much drive; /archives//html/Amps/1999-03/msg00459.html (7,940 bytes)
86. [AMPS] Alpha 89 SWR protection (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Fri, 19 Mar 1999 00:41:23 -0500; Can anyone tell me if the SWR protection circuits on the Alpha 89 are as sensitive as those on the 87A? Specifically, can the amp be tuned for full output into a 3:1 mismatch, or will that trip the p; /archives//html/Amps/1999-03/msg00460.html (7,636 bytes)
87. [AMPS] Alpha 89 SWR protection (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Sat, 20 Mar 1999 01:12:20 -0500; Both kW Ah. Thanks, Dick. After four years of owning one, I finally understand the reason for the 250W reflected power trip used in the 87A. I never thought about the PIN diodes! It's not been a pro; /archives//html/Amps/1999-03/msg00503.html (10,225 bytes)
88. [AMPS] Re: Re[CQ Contest}RE: [TowerTalk] 22VAC to 2 110VAC circuits (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Tue, 23 Mar 1999 12:38:32 -0500; This discussion brings up a related issue: what's the best choice for a 220VAC outlet for an amplifier and how should it be wired? Locally, I've been able to find two surface-mount NEMA outlet boxes; /archives//html/Amps/1999-03/msg00580.html (9,465 bytes)
89. [AMPS] Proper wiring: 220VAC plugs/outlets (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Wed, 24 Mar 1999 22:16:26 -0500; I only got a couple of replies to my query and am still not sure about the correct wiring. I had hoped that some of the professional electricians on the reflector would comment. Maybe the title had s; /archives//html/Amps/1999-03/msg00604.html (9,406 bytes)
90. [AMPS] Amp opinion/infomation requested ASAP!! (score: 1): Author: Dick Green" <dick.green@valley.net (Dick Green); Date: Sun, 28 Mar 1999 21:47:58 -0500; snip... ... snip And the usual bit would be....? 73, Dick, WC1M -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.; /archives//html/Amps/1999-03/msg00653.html (8,624 bytes)
91. [AMPS] Lets chew on this (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Wed, 5 Mar 1997 13:34:56 -0500; My two cents, also from a non-expert: I think Doug is right about the reflected power not necessarily being lost (i.e., being available to be radiated), but it depends on the impedance match between; /archives//html/Amps/1997-03/msg00035.html (13,694 bytes)
92. [AMPS] Lets chew on this (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Wed, 5 Mar 1997 14:40:03 -0500; Assuming you are describing a situation where the transmitter and antenna system are not matched, I wouldn't say that the reflected power is "retransmitted" on the next cycle, but rather that the 10; /archives//html/Amps/1997-03/msg00040.html (8,916 bytes)
93. [AMPS] LETS CHEW SOME MORE! (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Thu, 6 Mar 1997 00:32:47 -0500; with a antenna Actually, this is a very easy test to run on an 80-meter dipole. Run one test at the point of resonance (hopefully the antenna will be high enough to give you a SWR of 1:1 at resonanc; /archives//html/Amps/1997-03/msg00051.html (7,685 bytes)
94. [AMPS] Re: SWR, power and losses (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Thu, 6 Mar 1997 00:22:34 -0500; antenna. it. perfect will I agree that 1500 watts will be radiated, but the meter won't read twice the power being delivered by the amp. Theory or no theory, that's not what I've seen in actual prac; /archives//html/Amps/1997-03/msg00052.html (8,642 bytes)
95. [AMPS] Re: SWR, power and losses (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Thu, 6 Mar 1997 01:02:39 -0500; antenna. it. perfect will I agree that 1500 watts will be radiated, but the meter won't read twice the power being delivered by the amp. Theory or no theory, that's not what I've seen in actual prac; /archives//html/Amps/1997-03/msg00054.html (8,628 bytes)
96. [AMPS] LETS CHEW SOME MORE! (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Thu, 6 Mar 1997 01:03:31 -0500; with a antenna Actually, this is a very easy test to run on an 80-meter dipole. Run one test at the point of resonance (hopefully the antenna will be high enough to give you a SWR of 1:1 at resonanc; /archives//html/Amps/1997-03/msg00055.html (7,702 bytes)
97. [AMPS] I Was Wrong (Sort of...) (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Sun, 9 Mar 1997 01:14:35 -0500; Well, I did the honorable thing and researched the reflected power question in the ARRL Handbook (1995 edition) and Bill Orr's Handbook (23rd edition.) For those who care, here are the results. By th; /archives//html/Amps/1997-03/msg00091.html (14,887 bytes)
98. [AMPS] Re: conjugate match (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Sun, 9 Mar 1997 18:24:21 -0500; Thanks, Tom. That cleared up a lot for me. The 1995 ARRL Handbook says basically the same thing, although somewhat less clearly (p 13.3, ff). They say that a Class A amplifier operating with a conjug; /archives//html/Amps/1997-03/msg00095.html (7,175 bytes)
99. [AMPS] Icom 756 (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Wed, 19 Mar 1997 23:56:49 -0500; Wow. Is all that circuitry really necessary? I built a pretty simple solid state interface between my TS940S (and, later, TS950SDX) and my SB-221 when I did Rick Measures' QSK mod. Following Rick's d; /archives//html/Amps/1997-03/msg00192.html (11,688 bytes)
100. [AMPS] Alpha 87A Problem (score: 1): Author: dick.green@valley.net ("Dick Green".); Date: Sat, 22 Feb 1997 11:19:27 -0500; Hi. I've discovered an unusual problem on the Alpha 87A and wonder if anyone else has run into it. If you set the amp to operate on 1.8 MHz or 3.5 MHz, then change bands by RF sensing to any frequenc; /archives//html/Amps/1997-02/msg00030.html (8,287 bytes)

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