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181. [TenTec] Scout,Omni,TS 850 transmit (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sat, 24 Aug 2002 17:57:53 -0500; Well 50 watts is 3 dB down from 100 watts, but a -25 dB third order intermod product is still 3 dB up from the third order intermod product from a 100 watt radio doing -31 dB third order intermod. An; /archives//html/TenTec/2002-08/msg00438.html (9,378 bytes)
182. [TenTec] close talking was Scout,Omni,TS 850 transmit (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sun, 25 Aug 2002 11:58:08 -0500; So dig into microphone or radio and find an audio coupling capacitor in the transmitter. Take it out and put on in that is half its size. That will double the roll off frequency for the bass. Close t; /archives//html/TenTec/2002-08/msg00453.html (8,956 bytes)
183. [TenTec] Paragon VFO Problem (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 26 Aug 2002 07:26:34 -0500; I think he meant that the tuning slowed though the knob turned OK. But if you are going to apply OIL, apply OIL, not distilled kerosene! Water Displacer number 40 is not a permanent or quality lubric; /archives//html/TenTec/2002-08/msg00473.html (8,411 bytes)
184. [TenTec] Paragon VFO Problem (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 26 Aug 2002 12:24:23 -0500; The other component of a spray can of WD-40 is the propellant, propane. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson, electrical engineer. Reproduction by permission only.; /archives//html/TenTec/2002-08/msg00485.html (8,066 bytes)
185. [TenTec] close talking was Scout,Omni,TS 850 transmit (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 26 Aug 2002 17:17:53 -0500; Soldering isn't a tough task if done properly with good tools. Poking around a radio with poor tools and techniques can turn a fixable radio into trash. The Heathkit assembly manuals had a good secti; /archives//html/TenTec/2002-08/msg00514.html (8,832 bytes)
186. [TenTec] Re: synthesizers was Omni C (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 26 Aug 2002 22:15:30 -0500; Tentec designed the Omni V, and VI (and I don't know about the Paragon) with the synthesizer at VHF and divided it down to reduce the phase noise. Its not perfect but its better than most rice boxes; /archives//html/TenTec/2002-08/msg00527.html (8,263 bytes)
187. [TenTec] Re: synthesizers was Omni C (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 27 Aug 2002 02:09:26 -0500; DDS can be good close in and when not stretched too far, but DDS is not at all clean, there are so many spurs it usually takes a PLL (with the attendant noisy VCO) to act as a spur filter. I'm going; /archives//html/TenTec/2002-08/msg00529.html (8,402 bytes)
188. [TenTec] Re: synthesizers was Omni C (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 27 Aug 2002 08:10:23 -0500; The DDS has outputs at DC + desired frequency and clock - desired frequency of equal amplitude. Then there can be many others depending on the quality of the D/A and the number of bits in the D/A and; /archives//html/TenTec/2002-08/msg00532.html (9,580 bytes)
189. [TenTec] 6 meter 1208 transverter 10/6 help needed (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00068.html (6,987 bytes)
190. [TenTec] Another Bit - Bad Pegasus Audio Problem (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00082.html (7,627 bytes)
191. [TenTec] interface question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00103.html (7,071 bytes)
192. [TenTec] 60 mtr band (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00294.html (7,882 bytes)
193. [TenTec] Another question on Scout (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00468.html (7,390 bytes)
194. [TenTec] a little off subject question. (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00170.html (7,272 bytes)
195. [TenTec] S/S G5RV "off subhect question . . ." (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00182.html (7,359 bytes)
196. [TenTec] Stainless Steel Antenna Wire (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00202.html (7,597 bytes)
197. [TenTec] Stainless Steel Antenna Wire (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00205.html (7,320 bytes)
198. [TenTec] Bulb replacement in Model 238 Tuner (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00236.html (7,282 bytes)
199. [TenTec] Adding band to Omni D Series B (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00286.html (8,551 bytes)
200. [TenTec] Adding band to Omni D Series B (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); 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/msg00292.html (8,524 bytes)

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