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201. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 13:27:21 -0600
The grounding of the antenna side of the coil (typically between two caps connected in series, with the the opposite end of the caps connected across the ends of the coil) as seen in many link-couple
/archives//html/TenTec/2011-01/msg00359.html (12,836 bytes)

202. Re: [TenTec] Obsolescence was: Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 13:36:58 -0600
That suggestion came up with the slow updates of the Orions a couple years ago, but it appears Tentec is unwilling to open up their source code to inspection, scrutiny, or user participation in code
/archives//html/TenTec/2011-01/msg00360.html (12,583 bytes)

203. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 13:52:57 -0600
I only remember the stuff that melted when overworked. Or soldered too close to. One can't expect to work a plastic supported coil at incandescent wire temperatures and have the wires stay in place t
/archives//html/TenTec/2011-01/msg00361.html (11,788 bytes)

204. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 13:55:54 -0600
I don't recall significant differences between Airdux and B&W other than the color of the box. I still have some of both. And they were made by melting a hot wire into the plastic, most likely NOT ny
/archives//html/TenTec/2011-01/msg00362.html (9,576 bytes)

205. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 14:05:24 -0600
The models were 275w and 1KW. I had the KW version about 45 years ago. Bought the small one about 2 years ago and didn't keep it long. The little MFJ-974B (for under $200) was far superior to the Vik
/archives//html/TenTec/2011-01/msg00363.html (10,993 bytes)

206. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 15:03:30 -0600
It only takes one basement flood to put the corrosion in and one try with a 600 watt amp to melt the coil. or running with no antenna connected and 100 watts is probably enough to melt the coil. They
/archives//html/TenTec/2011-01/msg00368.html (10,107 bytes)

207. Re: [TenTec] Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 15:49:58 -0600
I was looking at the wrong schematic set, the original Orion. Found the much much simpler logic board for the Omni VI in the Omni VI manual. CPU is an 80C32. Still available from multiple makers. Ram
/archives//html/TenTec/2011-01/msg00370.html (12,658 bytes)

208. Re: [TenTec] Obsolescence was: Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 19:21:50 -0600
When the stack and the variables are kept in volatile ram held up by a battery and that battery gets old the computer runs wild. I doubt there's any code stored in the ram unless its self modifying w
/archives//html/TenTec/2011-01/msg00383.html (14,118 bytes)

209. Re: [TenTec] ant (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 19:52:21 -0600
In Germany that coil tubing was probably 6 or 8 mm diameter. Practically 1/4 or 5/16" diameter. I just checked a couple banana plugs and jacks. I get 0.145" as the smallest rigid diameter of the plug
/archives//html/TenTec/2011-01/msg00385.html (11,997 bytes)

210. Re: [TenTec] ic (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 14 Jan 2011 19:53:58 -0600
Maxim owns Dallas Semiconductor who made most of that type part and still does. And Maxim is very good about selling single units for samples. Might be ham influence over the decades in management. 7
/archives//html/TenTec/2011-01/msg00386.html (7,196 bytes)

211. Re: [TenTec] Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 Jan 2011 16:05:29 -0600
Given a working Omni VI to compare too (and borrow some parts from) it appears to be fairly practical to keep working though my first attack would be to connect around the DSP to minimize the work re
/archives//html/TenTec/2011-01/msg00414.html (11,485 bytes)

212. Re: [TenTec] tripped up... or down, as the case may be (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 Jan 2011 16:17:45 -0600
A tale of misfortune and fortune. And before I decide which way to go, I thought I'd check and see if the symptoms ring any bells out there... I was on the air with my Omni VI opt 3... I was switchin
/archives//html/TenTec/2011-01/msg00415.html (9,474 bytes)

213. Re: [TenTec] Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 Jan 2011 16:30:15 -0600
According to the schematics in the downloaded Omni VI manual, the processor is an 80C32 using external memory and ROM. The memory chip is not very common, but Jameco has some. The CPU chip is availab
/archives//html/TenTec/2011-01/msg00416.html (13,082 bytes)

214. Re: [TenTec] Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 Jan 2011 19:01:02 -0600
Point is, the ONLY custom chip is the EPROM, I have a shoe box full, but don't have the TenTec Omni VI code. 73, Jerry, K0CQ On 1/17/2011 6:55 PM, NL7VL wrote: My experience in field troubleshooting
/archives//html/TenTec/2011-01/msg00421.html (10,855 bytes)

215. Re: [TenTec] Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 Jan 2011 20:07:22 -0600
From a distance we have NO way to tell if its the EPROM. But a whole string of Kenwoods had a problem with EPROM sockets so the factory solution was to solder the EPROM in after pulling the socket. A
/archives//html/TenTec/2011-01/msg00426.html (13,532 bytes)

216. Re: [TenTec] Omni 6 Logic Board Failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 17 Jan 2011 20:15:31 -0600
With the EPROM programmer card attached to my old DOS computer (third to the right of this computer on my desk) it would take longer to boot the computer and set the EPROM parameters than to read it
/archives//html/TenTec/2011-01/msg00427.html (12,536 bytes)

217. Re: [TenTec] WAS: Omni 6 Logic board failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 19 Jan 2011 13:23:34 -0600
<SNIP> Many of us could kludge a daughter-board arrangement as a fix, but as Geoff, N3OWJ pointed out, the costs of board development are prohibitive - even to Ten-Tec. Actually there are commercial
/archives//html/TenTec/2011-01/msg00454.html (11,466 bytes)

218. Re: [TenTec] Corsair II problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 20 Jan 2011 14:33:00 -0600
The counter, display driver, and keyer are all done by a 68C05 on the display board. It fails when the electrolytics go bad. It can also fail from loosing power from a dirty board connection. It does
/archives//html/TenTec/2011-01/msg00466.html (9,010 bytes)

219. Re: [TenTec] Corsair II problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 20 Jan 2011 20:59:12 -0600
That capacitor on the reset pin may not be terribly critical, I'd expect anything from 1 mf to 10 mf would work adequately because electrolytics have very loose tolerances anyway. An open capacitor o
/archives//html/TenTec/2011-01/msg00469.html (9,595 bytes)

220. Re: [TenTec] Corsair II problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 20 Jan 2011 23:31:33 -0600
End bulged or the lead broken in the end insulator? Its a little blurry. 73, Jerry, K0CQ http://www.zerobeat.net/wb8yqj/c6.jpg
/archives//html/TenTec/2011-01/msg00471.html (8,118 bytes)

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