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221. Re: [TenTec] Corsair II problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 20 Jan 2011 23:35:11 -0600
If that's open it won't reset. It could be checked by grounding that pin of the 68C05 momentarily. To see if that makes it start. 73, Jerry, K0CQ http://www.zerobeat.net/wb8yqj/c6.jpg
/archives//html/TenTec/2011-01/msg00472.html (8,204 bytes)

222. Re: [TenTec] Corsair II problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 21 Jan 2011 13:47:25 -0600
Take tantalum over aluminum. At first I thought it was glued to the PCB, after removing it it became obvious that the liquid on the capacitor was leaking down all over everything. Heading to Frys to
/archives//html/TenTec/2011-01/msg00475.html (8,790 bytes)

223. Re: [TenTec] Symptoms of logic board failure (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 21 Jan 2011 19:22:13 -0600
The time base messes up the processors, both control and DSP. Likely the buttons are side effects of the control processor running poorly. And that could be an effect of the FSK also. Flickering mete
/archives//html/TenTec/2011-01/msg00479.html (11,914 bytes)

224. Re: [TenTec] Orion with Dying Receiver (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 22 Jan 2011 11:27:02 -0600
I've lost track of the number of radios I've fixed by tightnening ground and board mounting screws direct or by suggestion. Vibration makes them work loose, and the plastic shrinks from the pressure
/archives//html/TenTec/2011-01/msg00488.html (9,434 bytes)

225. Re: [TenTec] Orion with Dying Receiver (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 22 Jan 2011 12:10:38 -0600
Vibration from the speaker no doubt speeds up things working loose. But they work loose anyway, from vibration of the external speaker, rigs run mobile, hand helds, normal operation, and temperature
/archives//html/TenTec/2011-01/msg00490.html (9,256 bytes)

226. Re: [TenTec] Orion Update (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 23 Jan 2011 08:45:17 -0600
Or a solder connection on one of those boards. 73, Jerry, K0CQ On 1/23/2011 8:19 AM, K8JDC wrote: Well, my Orion is still acting flaky. Having worked on it and thought about it, I think it's related
/archives//html/TenTec/2011-01/msg00497.html (8,602 bytes)

227. Re: [TenTec] Orion Update (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 23 Jan 2011 19:29:34 -0600
I'm not a great fan of the IDC connectors, I'd prefer soldered or crimped because I've had IDC let me down. 73, Jerry, K0CQ On 1/23/2011 1:03 PM, Ron Castro wrote: The RIT has been a persistent probl
/archives//html/TenTec/2011-01/msg00509.html (10,000 bytes)

228. Re: [TenTec] FS - Corsair II and Filters (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 24 Jan 2011 14:49:28 -0600
Since that switch does nothing inside the Corsair II, it only switches the power supply primary, use the switch on the power supply. 73, Jerry, K0CQ On 1/24/2011 2:30 PM, Jeff Kelly wrote: I have a v
/archives//html/TenTec/2011-01/msg00529.html (7,800 bytes)

229. Re: [TenTec] Omni VI 1st IF Narrow CW Filter Enable? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 25 Jan 2011 18:05:51 -0600
Lining up the two filter passbands is a front panel control. Called PBT, paragraph 3.5-12 in the manual. Its anticipates that the first filter would always be SSB bandwidth, so the bandpass tuning wi
/archives//html/TenTec/2011-01/msg00546.html (12,208 bytes)

230. Re: [TenTec] Omni VI S-meter (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 26 Jan 2011 01:11:42 -0600
Chasing the schematics, I find the meter is driven by the S-meter circuits for SSB and FM through diodes for all positions of the meter switch. The difference is that its also driven by a op amp on t
/archives//html/TenTec/2011-01/msg00553.html (8,478 bytes)

231. Re: [TenTec] Under the Dirt...a Diamond! (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 26 Jan 2011 13:17:58 -0600
The stuck PTOs may only be congealed grease that would respond to a suitable solvent for thinning. Or like a Drake TR-4 given to a friend of mine, have been dropped on the face bending the shaft and
/archives//html/TenTec/2011-01/msg00557.html (15,398 bytes)

232. Re: [TenTec] Omni VI 1st IF Narrow CW Filter Enable? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 27 Jan 2011 23:25:10 -0600
I use an external speaker passive low pass filter to tone down high frequency howling in my receiver audios when needed. I have a couple circuits, but one that I published is on line at: http://www.g
/archives//html/TenTec/2011-01/msg00588.html (11,757 bytes)

233. Re: [TenTec] Omni VI 1st IF Narrow CW Filter Enable? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 28 Jan 2011 11:30:54 -0600
Ah, but describing the circuit with math allows easy analysis and creation without having to assemble a million combinations of parts and measuring to see the results. This filter is a low pass with
/archives//html/TenTec/2011-01/msg00593.html (16,718 bytes)

234. Re: [TenTec] WARC band crystal part numbers (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 28 Jan 2011 11:47:22 -0600
ICM can work from the schematic to determine the circuit capacitance. ICM can work from an existing crystal to determine the circuit capacitance needed. Working from the crystal is fastest. Tolerance
/archives//html/TenTec/2011-01/msg00595.html (10,702 bytes)

235. Re: [TenTec] WARC band crystal part numbers (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 28 Jan 2011 16:08:02 -0600
Yes the 17 meter spur was fixed at some point. Yhe way know its fixed is when you have to go to the inverted side band to ge USB on 17m. Because the fix is to mix the 5 MHz PTO with 22 MHz to make a
/archives//html/TenTec/2011-01/msg00600.html (9,650 bytes)

236. Re: [TenTec] WARC band crystal part numbers (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 28 Jan 2011 16:16:37 -0600
6.3 MHz is only used in the receive chain for Pass Band Tuning. Not in the transmitter line. I think. I've not had a delta or a delta manual. I'll stick by what I wrote in 2003. If you have to go to
/archives//html/TenTec/2011-01/msg00601.html (9,571 bytes)

237. Re: [TenTec] WARC band crystal part numbers (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 28 Jan 2011 17:04:27 -0600
Now that I've down loaded and studied the manual, I see. Shades of the mixing schemes of Collins 75A, 75S, 32S, and KWM rigs as well as many a heathkit with a tunable IF. With all the tx mixer crysta
/archives//html/TenTec/2011-01/msg00605.html (9,514 bytes)

238. Re: [TenTec] Omni VI 1st IF Narrow CW Filter Enable? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 28 Jan 2011 23:31:39 -0600
I think RS and MCM carry the transformers yet, maybe Hosfeldt (but I'm mad at Hosfeldt so I don't like to recommend them), I know a few weeks ago Mouser had the coils, capacitors and switch. 73, Jerr
/archives//html/TenTec/2011-01/msg00613.html (10,428 bytes)

239. Re: [TenTec] WARC band crystal part numbers (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 29 Jan 2011 09:25:53 -0600
The OMNI C manual I have downloaded from TenTec shows a table of LO injection frequencies to the signal mixers on page 3-13. It shows 9-9.5 for the 18 MHz band. That's guaranteed to produce the spur.
/archives//html/TenTec/2011-01/msg00617.html (12,801 bytes)

240. Re: [TenTec] mini coax jumpers (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 29 Jan 2011 10:30:12 -0600
Its called a rocket connector from the fins after crimping. It only assembles by crimping on small cables. I think all the mates are PC board mount. Amphenol is one maker though they tend to not be i
/archives//html/TenTec/2011-01/msg00620.html (8,577 bytes)

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