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281. Re: [TenTec] A grounding question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 07 Jan 2007 23:49:17 -0600
Sink effect occurs at 1 Hz and below. Just the skin depth is deeper than most practical conductors. My fourth edition Reference Data for Radio Engineers says skin depth at 100 MHz is 0.00035 inch. Si
/archives//html/TenTec/2007-01/msg00157.html (10,042 bytes)

282. Re: [TenTec] A grounding question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 08 Jan 2007 11:18:44 -0600
No matter how broad (at least in practical widths under a couple feet) a strap, when the electrical length gets to be a quarter wave or an odd multiple of a quarter wave, at RF its an open circuit. 7
/archives//html/TenTec/2007-01/msg00163.html (10,397 bytes)

283. Re: [TenTec] A grounding question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 08 Jan 2007 15:22:09 -0600
I used soft copper sheet with the soldered tabs once at Collins to do RF measurements at millivolt level while 100KW and 250 KW transmitters were being exercised in the same lab. It seemed to have wo
/archives//html/TenTec/2007-01/msg00168.html (8,603 bytes)

284. Re: [TenTec] Class A (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 09 Jan 2007 12:20:52 -0600
ROTFLMAO! _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2007-01/msg00198.html (9,867 bytes)

285. Re: [TenTec] TT Omni VI final overcurrent protection?Parasitic Occilation Protection? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 09 Jan 2007 20:15:04 -0600
Your choice of battery is odd, strange, and poorly selected. Gel cell batteries are limited in charging and discharging current and I suspect your power supply will charge them too fast for their own
/archives//html/TenTec/2007-01/msg00224.html (12,712 bytes)

286. Re: [TenTec] Bad Filter #217 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 09 Jan 2007 20:24:22 -0600
I believe the Tentec crystal circuit is one of series crystals with a shunt "coupling" capacitor to ground between each pair of crystals. If so you get narrower bandwidth by increasing the values on
/archives//html/TenTec/2007-01/msg00225.html (9,564 bytes)

287. Re: [TenTec] grounding (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 09 Jan 2007 22:34:38 -0600
End fed wires, off center fed windoms, and verticals are the worst antennas at inducing RF in the shack. Quarter wave counterpoise wires hooked to the rig and open at the other end do act as a RF con
/archives//html/TenTec/2007-01/msg00235.html (9,852 bytes)

288. Re: [TenTec] Grounding (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 09 Jan 2007 22:37:39 -0600
Lots of counterpoise at the antenna help it radiate by reducing losses of ground currents that contribute to antenna radiation patterns. Counterpoises at the radio can sometimes lower then RF voltage
/archives//html/TenTec/2007-01/msg00236.html (8,816 bytes)

289. Re: [TenTec] O II in hostile environment? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 10 Jan 2007 11:01:49 -0600
The bandpass filters and stubs protect it on receive too. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman
/archives//html/TenTec/2007-01/msg00254.html (8,076 bytes)

290. Re: [TenTec] TT Omni VI finalovercurrent protection?Parasitic Occilation Protection? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 10 Jan 2007 11:27:41 -0600
So they are NOT gel cells. Sealed, with electrolyte in fiberglass mats, are not gel cells. Their electrolyte is more mobile than in a gel, and so they appear to be able to handle larger currents. At
/archives//html/TenTec/2007-01/msg00256.html (17,430 bytes)

291. Re: [TenTec] How dioes one modify a crystal flter? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 11 Jan 2007 11:54:16 -0600
Its a combination of crystals and capacitors that set the bandwidth. Its probably more profitable to buy the whole filter from TT or Inrad. But to do it at home, go hunt up QST, and Handbook articles
/archives//html/TenTec/2007-01/msg00283.html (8,329 bytes)

292. Re: [TenTec] Omni VI Keyer Speed Control (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 11 Jan 2007 11:56:42 -0600
Once you've measured the values that set the limits of the speed range you wish, you should be able to use a fixed (or adjustable) series resistor to set the high and a resistor shunting the panel va
/archives//html/TenTec/2007-01/msg00285.html (8,441 bytes)

293. Re: [TenTec] Omni VI Keyer Speed Control (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 11 Jan 2007 18:51:56 -0600
Unless the "pot" is a digital encoder you surely can adjust end point and range with a resistor in series with the pot and another in shunt with the pot. To set the series resistor, wire it in and ru
/archives//html/TenTec/2007-01/msg00292.html (9,724 bytes)

294. Re: [TenTec] Omni VI Keyer Speed Control (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 12 Jan 2007 13:44:34 -0600
Try a 10K in series with the purple wire. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec
/archives//html/TenTec/2007-01/msg00303.html (9,362 bytes)

295. Re: [TenTec] which radio? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 13 Jan 2007 12:02:08 -0600
As I rustilly recall doing my Corsair II, first you remove the knobs from the front. Then the end trim, then the front panel. Then you unhook those wires and unmount the PTO. Since there are small ba
/archives//html/TenTec/2007-01/msg00339.html (8,769 bytes)

296. Re: [TenTec] code speed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 14 Jan 2007 12:52:25 -0600
WW2 surplus code records I practice with were 18 wpm code groups. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com
/archives//html/TenTec/2007-01/msg00368.html (6,730 bytes)

297. Re: [TenTec] OMNI SIX problems (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 15 Jan 2007 21:12:26 -0600
Like was suggested for the Argosy today, a quarterer drop of DeoxIT on each connector pin can help as can tightening the board mounting/grounding screws for all the boards. These two steps fix many r
/archives//html/TenTec/2007-01/msg00423.html (9,031 bytes)

298. Re: [TenTec] Crystals needed (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 16 Jan 2007 21:24:14 -0600
ICM in Oklahoma City is very good and they charge accordingly. I hear Peterson Crystal in Council Bluffs Iowa is still making ham crystals. I don't have a catalog or a web page. Ordinary frequencies
/archives//html/TenTec/2007-01/msg00453.html (8,338 bytes)

299. Re: [TenTec] O-2, First Impressions (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 17 Jan 2007 11:12:53 -0600
The adjustable bandpass on my Corsair II will get selectivity down to under 100 Hz, won't the Omni do as well? Possibly not with the steep skirts of the DSP filters though. 73, Jerry, K0CQ __________
/archives//html/TenTec/2007-01/msg00472.html (8,293 bytes)

300. Re: [TenTec] WTB Orion I (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 17 Jan 2007 22:09:36 -0600
Tentec has a special this month on Orion 1. Contact them. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman
/archives//html/TenTec/2007-01/msg00507.html (7,851 bytes)

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