Search String: Display: Description: Sort:

Results:

References: [ +from:geraldj@isunet.net: 357 ]

Total 357 documents matching your query.

241. Re: [TenTec] 6 meter 1208 transverter 10/6 help needed (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 04 Jul 2002 09:48:13 -0500
On the 1209 that I built from a kit, the second gate bypass capacitor for the RF stage needed soldering on the component side of the board to get a good ground connection. Without that the double gat
/archives//html/TenTec/2002-07/msg00061.html (7,343 bytes)

242. Re: [TenTec] Another Bit - Bad Pegasus Audio Problem (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 05 Jul 2002 00:44:30 -0500
Lift off the cover. Tighten the PC board mounting screws. If that doesn't work, try heating and cooling major sections of the synthesizer part of the radio to identify temperature sensitivity. Look f
/archives//html/TenTec/2002-07/msg00075.html (8,036 bytes)

243. Re: [TenTec] interface question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 07 Jul 2002 08:39:34 -0500
You need a much smaller pot. Your TNC output is 250 times what the radio needs, and the maximum output from your divider is 25 times what the radio needs. Modern import pots don't do a good job of go
/archives//html/TenTec/2002-07/msg00096.html (7,480 bytes)

244. Re: [TenTec] 60 mtr band (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 16 Jul 2002 20:02:10 -0500
I checked the PA of the 1209 that I built a couple years ago. It was still working with full gain and full power output at 10 MHz (lowest I had a decent calibrated signal generator at the time). The
/archives//html/TenTec/2002-07/msg00289.html (8,297 bytes)

245. Re: [TenTec] Another question on Scout (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 29 Jul 2002 09:01:47 -0500
Using the 1208 transverter takes a lot less engineering. The low IF of the Scout could make keeping down mixer products a significant pain. There's no need for extended coverage on 6m, like Shawn say
/archives//html/TenTec/2002-07/msg00464.html (7,775 bytes)

246. Re: [TenTec] a little off subject question. (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 11 Jun 2002 10:23:38 -0500
It works, though there may be a half dB of resistive loss, depending on the tuning. Might even be a bit more. I have had no problems using insulated 12 gauge stranded house wire for an inverted V in
/archives//html/TenTec/2002-06/msg00166.html (7,694 bytes)

247. Re: [TenTec] S/S G5RV "off subhect question . . ." (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 12 Jun 2002 15:43:43 -0500
Actually I find soldered connections with good copper antenna parts tend to corrode open in time. A really good mechanical connection with electromotive force compatible materials lasts far longer in
/archives//html/TenTec/2002-06/msg00178.html (7,703 bytes)

248. Re: [TenTec] Stainless Steel Antenna Wire (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 13 Jun 2002 19:00:55 -0500
B&W broad banded folded dipoles are little more than a leaky dummy load. Often as much as 20 dB down from a dipole. The secret matching box is nothing but a power resistor. I'd rather use a tuner and
/archives//html/TenTec/2002-06/msg00198.html (7,956 bytes)

249. Re: [TenTec] Stainless Steel Antenna Wire (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 14 Jun 2002 09:11:27 -0500
Just points out that many HF paths can be worked with watts instead of 100s of watts. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.
/archives//html/TenTec/2002-06/msg00201.html (7,657 bytes)

250. Re: [TenTec] Bulb replacement in Model 238 Tuner (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sat, 15 Jun 2002 21:13:43 -0500
The 1813 and 1892 are practically the same lamp. 14.40 volts at .1 or .120 amps. I don't know but probably TenTec uses which ever one they have handy at the time of assembly. If you want longer lamp
/archives//html/TenTec/2002-06/msg00232.html (7,676 bytes)

251. Re: [TenTec] Adding band to Omni D Series B (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 18 Jun 2002 19:34:40 -0500
The problem is that the IF is 9 MHz, the output is 18 MHz so the oscillator for the simple hardware scheme is 9 MHz. Trouble is that the second harmonic of the oscillator will be stronger than the mi
/archives//html/TenTec/2002-06/msg00282.html (8,888 bytes)

252. Re: [TenTec] Adding band to Omni D Series B (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 19 Jun 2002 08:07:50 -0500
Depends on what the crystal and tuned circuits are. If the crystal added is 4.0 MHz give or take a couple KHZ, there's going to be that strong transmit spur. If the crystal is 22 MHz, its clean. Anot
/archives//html/TenTec/2002-06/msg00288.html (8,900 bytes)

253. Re: [TenTec] Adding band to Omni D Series B (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 19 Jun 2002 08:15:28 -0500
The 546-C schematic I have says the crystal for 18 MHz is 4.0 MHz. That's the one with the strong spur. What does your manual show for the 18 MHz crystal? 73, Jerry, K0CQ -- Entire content copyright
/archives//html/TenTec/2002-06/msg00290.html (8,718 bytes)

254. Re: [TenTec] Adding band to Omni D Series B (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 19 Jun 2002 08:41:32 -0500
Fixing should; require two changes. Change the crystal to 22.0 MHz. Change the coil and capacitor on the PTO mixer output for 18 Mhz to one that tunes to 27 MHz. Maybe change the counter initializati
/archives//html/TenTec/2002-06/msg00292.html (9,934 bytes)

255. Re: [TenTec] Pegasus keyer (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 28 Jun 2002 12:12:16 -0500
Switched to straight key mode? 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.
/archives//html/TenTec/2002-06/msg00475.html (6,985 bytes)

256. Re: [TenTec] In Rush Protection (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 30 Jun 2002 09:55:46 -0500
There can be some inrush protection inherent in the separate transformer. The resistance of a tungsten filament is 12 to 15 times higher at operating temperature than at room temperature. This change
/archives//html/TenTec/2002-06/msg00502.html (8,065 bytes)

257. Re: [TenTec] Stuff needed (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Wed, 01 May 2002 17:45:54 -0500
RS carries the microphone connector (common for CB). Other places like Mouser too. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.
/archives//html/TenTec/2002-05/msg00025.html (6,987 bytes)

258. Re: [TenTec] SO2R with Ten Tecs? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 06 May 2002 12:44:25 -0500
The Corsair II already has the separate receiver antenna jack. No mods needed, just open a switch on the back panel and hook the input to the auxiliary receiver jack. 73, Jerry, K0CQ -- Entire conten
/archives//html/TenTec/2002-05/msg00085.html (7,437 bytes)

259. Re: [TenTec] SO2R with Ten Tecs? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 06 May 2002 22:25:58 -0500
There IS isolation IF and only IF you throw the RX/TRX switch on the back panel that causes the isolation. If you leave that switch connected, transmitter RF may show on the receiver input jack. Thou
/archives//html/TenTec/2002-05/msg00105.html (9,335 bytes)

260. Re: [TenTec] TEN TEC PTO REBUILD! (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 07 May 2002 16:46:57 -0500
Just one addition suggestion. Work in a tray with raised sides to slow down the rolling parts leaving. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission on
/archives//html/TenTec/2002-05/msg00135.html (6,931 bytes)

Current List: 241 - 260
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18]
This search system is powered by Namazu