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1. [Amps] Alpha 87A Fault 17 (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Sat, 31 Dec 2016 03:40:29 +0000; Hello friends, I am in need of some info and/or suggestions regarding a fault 17 problem. I am helping a friend restore his 87A to operation after he changed the blower. Immediately prior to the blow; /archives//html/Amps/2016-12/msg00535.html (10,990 bytes)
2. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Sat, 31 Dec 2016 08:41:00 -0600; I see a variable capacitor in the wattmeter, the only adjustment. Is this a calibration adjustment? This is called the Null adjustment. Which you set for lowest reflected power with the amplifier int; /archives//html/Amps/2016-12/msg00541.html (12,205 bytes)
3. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: "Jerry O. Stern" <jsternmd@att.net>; Date: Sat, 31 Dec 2016 10:28:25 -0500; Fault 17 could be due to several issues, the fault reporting only shows the last fault and sometimes the actual triggering cause may precede the 17. You will need to hook up the 87A to a PC with hype; /archives//html/Amps/2016-12/msg00542.html (14,241 bytes)
4. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Sat, 31 Dec 2016 18:05:27 +0000; Thanks for the response Jerry. I have the computer hooked to the CPU. Because of the difficulty in finding the cause of Fault 1, I have had to reset the Fault 99 complete lockout twice clearing all t; /archives//html/Amps/2016-12/msg00543.html (17,113 bytes)
5. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: "Dick Green WC1M" <wc1m73@gmail.com>; Date: Sat, 31 Dec 2016 13:51:18 -0500; This one is a long-shot, but are you sure the amp doesn't have bad tuning parameters? It's conceivable that the user tuning parameters for 20m were for a non-resonant antenna or perhaps got corrupted; /archives//html/Amps/2016-12/msg00544.html (18,202 bytes)
6. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 31 Dec 2016 10:53:20 -0800; The diodes in the 87A output power/swr measuring circuit are a common failure. - Paul I have the computer hooked to the CPU. Because of the difficulty in finding the cause of Fault 1, I have had to r; /archives//html/Amps/2016-12/msg00545.html (20,047 bytes)
7. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: "Jerry O. Stern" <jsternmd@att.net>; Date: Sat, 31 Dec 2016 16:02:06 -0500; Charlie, I don't think it's the wattmeter as the amp can easily handle VSWR to 1.5 and with some tuning up to 2:1. Did you only test into your Yagi. Have you tested this on all bands into a dummy loa; /archives//html/Amps/2016-12/msg00546.html (17,415 bytes)
8. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Sun, 1 Jan 2017 16:39:22 +0000; Bruce, thanks for the thoughtful response. Yes, I was incorrect about the wattmeters being the same. Last night at dinner I thought about the CT ratios and checked that after coming home, but missed; /archives//html/Amps/2017-01/msg00002.html (17,387 bytes)
9. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Larry Dighera <LDighera@att.net>; Date: Sun, 01 Jan 2017 17:49:39 -0800; Hello Charlie, It sounds like your troubleshooting skills are up to the task, but if you need the input of an engineer very familiar with the Alpha 78A, I wholeheartedly recommend Glenn Pladsen (AE0Q; /archives//html/Amps/2017-01/msg00005.html (21,757 bytes)
10. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Mon, 2 Jan 2017 02:23:32 +0000; Thanks Larry. I am familiar with Glenn's stellar reputation, but have been hesitant to bother him with this. I figure he has a full plate. Perhaps if we are unsuccessful, we may have to ask Glenn for; /archives//html/Amps/2017-01/msg00006.html (23,653 bytes)
11. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Fri, 6 Jan 2017 15:52:16 +0000; Several folks have responded to my thread about the Alpha 87A fault 17. In particular Bruce W2SE has taken an interest in this problem, even though he has no 87A and we have exchanged several email m; /archives//html/Amps/2017-01/msg00131.html (15,088 bytes)
12. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: "Dick Green WC1M" <wc1m73@gmail.com>; Date: Fri, 6 Jan 2017 13:36:43 -0500; Hi Charlie, I've seen a lot of obscure 87A problems, including with my own amp, but this one takes the cake! damaged the wiring harness when replacing the blower, and that some of the wires were slic; /archives//html/Amps/2017-01/msg00135.html (16,812 bytes)
13. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Fri, 6 Jan 2017 20:36:57 +0000; I have good and bad news friends. The good news is the amplifier works with a temporary clip lead jumper in place of the open control wire between the input and output relays. Seems to have no issues; /archives//html/Amps/2017-01/msg00136.html (13,430 bytes)
14. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: "Dick Green WC1M" <wc1m73@gmail.com>; Date: Fri, 6 Jan 2017 17:15:05 -0500; Another takeaway from your experience is that a new problem is often a result of the last change that was made! I blush to admit that while repairing one thing I've inadvertently broken something els; /archives//html/Amps/2017-01/msg00138.html (13,975 bytes)
15. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Tue, 10 Jan 2017 18:19:18 +0000; The 1994 vintage Alpha 87A that I repaired for a friend was picked up by him on January 9. The amplifier, when tested on my antennas, made 1.5KW output on every band using about 60 watts drive with n; /archives//html/Amps/2017-01/msg00211.html (11,150 bytes)
16. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Charlie Young <weeksmgr@hotmail.com>; Date: Tue, 10 Jan 2017 18:40:29 +0000; By the way, these opens were not in the plugs. The problem was in the wires. I reused the plugs in both cases, splicing the new wire into the old wire coming out of the plugs about 1 to 1.5 inches be; /archives//html/Amps/2017-01/msg00212.html (12,306 bytes)
17. Re: [Amps] Alpha 87A Fault 17 (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 10 Jan 2017 10:49:38 -0800; Hi Charlie, 40 years ago, my job was field service of audio and video systems, many of them large and spread out. Experience taught me that the first thing to look for was a short to ground, which ne; /archives//html/Amps/2017-01/msg00213.html (10,322 bytes)

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