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261. [TenTec] More on Keying Waveshapes (long) (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Thu, 07 Feb 2002 10:50:56 -0600; When you say "raised sine" function, you mean sine squared. That's always 0 or positive, and so has no zero crossings at has a smooth transition from constant value 0 to constant value 1.0000 through; /archives//html/TenTec/2002-02/msg00167.html (7,500 bytes)
262. [TenTec] [OT] wireless paddles? (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 11 Feb 2002 22:01:31 -0600; You could use a cordless two button mouse. Wire the paddles in place of the two buttons. Interface the button outputs of the mouse station to the keyer. 73, Jerry, K0CQ -- Entire content copyright Dr; /archives//html/TenTec/2002-02/msg00220.html (7,067 bytes)
263. [TenTec] OMNI VI "click/chirp" (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sun, 17 Feb 2002 10:03:56 -0600; Reading the 1999 ARRL Handbook description of internal timing I see some explanation for a possible chirp and some solutions. The handbook says that at key closure, the processor signals the synthesi; /archives//html/TenTec/2002-02/msg00280.html (10,434 bytes)
264. [TenTec] OMNI VI "click/chirp" (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Sun, 17 Feb 2002 11:01:52 -0600; I suspect a few milliseconds delay on the make, shorter than the 5 milliseconds rise and fall won't adversely affect weight significantly. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Jo; /archives//html/TenTec/2002-02/msg00283.html (7,642 bytes)
265. [TenTec] Digital Speech Processing & Pegasus (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 19 Feb 2002 09:31:41 -0600; Clipped audio converted to SSB RF has enormous amplitude spikes. That makes audio clipping and audio compression work poorly for enhancing SSB transmitter output. The whole reason for any compression; /archives//html/TenTec/2002-02/msg00311.html (10,317 bytes)
266. [TenTec] Digital Speech Processing & Pegasus (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 19 Feb 2002 13:36:35 -0600; Its the corner in the derivative spectrum but its the flattening of the pseudo sine wave that adds harmonics. Remember a sine wave has no harmonics, but a very clipped sine wave is a square wave and; /archives//html/TenTec/2002-02/msg00313.html (13,834 bytes)
267. [TenTec] Digital Speech Processing & Pegasus (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 19 Feb 2002 21:51:27 -0600; My experiences with the Langevin clippers were in 1963-1965 and the product was quite experienced then. At that time I don't think domestic broadcasters were using it because Leroy May, chief enginee; /archives//html/TenTec/2002-02/msg00322.html (9,477 bytes)
268. [TenTec] Centaur (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Wed, 20 Feb 2002 12:57:06 -0600; Try tuning for maximum out, not for plate and grid currents. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.; /archives//html/TenTec/2002-02/msg00328.html (7,434 bytes)
269. [TenTec] Centaur (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Thu, 21 Feb 2002 21:07:14 -0600; Your simple math ignores the feed trough power inherent in the grounded grid linear. Most of the 100 watts of cathode drive shows up in the output raising the apparent efficiency. So your numbers sho; /archives//html/TenTec/2002-02/msg00350.html (7,935 bytes)
270. [TenTec] Centaur (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Thu, 21 Feb 2002 22:04:29 -0600; Yes 600 does sound difficult to achieve. Must have been rated with 20% high line voltage or at the peak of a leading edge of a dot before the power supply drooped. Like an audio amplifier where the s; /archives//html/TenTec/2002-02/msg00352.html (7,927 bytes)
271. [TenTec] Re: FYI - key click thread on Ten-Tec reflector (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Thu, 31 Jan 2002 21:06:16 -0600; The time response of the receive filter has a great deal to do with how a signal sounds to the ear. The classic mechanical and crystal lattice filters tend to have a square shouldered flat topped fre; /archives//html/TenTec/2002-01/msg00008.html (11,334 bytes)
272. [TenTec] 1208 Transverter / 6m Operation (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 01 Jan 2002 13:59:43 -0600; I don't think the tuned circuits in the 1208 can be mistuned as far as 21 MHz. They may not be tuned for 50 MHz, though and so be attenuating the desired signal. I'd suggest a TV type high pass TVI f; /archives//html/TenTec/2002-01/msg00021.html (7,484 bytes)
273. [TenTec] Tone(s) on Pegasus receive (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 07 Jan 2002 11:11:22 -0600; Its fairly easy to hear discrete signals below the noise level of the receiver. Ears are sometimes marvelous narrow band filters that can ignore noise and concentrate on signals. Its easier when the; /archives//html/TenTec/2002-01/msg00096.html (8,652 bytes)
274. [TenTec] Corsair Filter Question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 07 Jan 2002 21:50:02 -0600; When the stock SSB filters can be scrunched down to may 100 Hz with the band pass tuning, I waited for many months before I installed the 500 Hz filter. The Corsair takes the same filters as the Omni; /archives//html/TenTec/2002-01/msg00113.html (7,648 bytes)
275. [TenTec] Corsair Filter Question (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 08 Jan 2002 11:27:12 -0600; The Corsair I came with the four pole filter. The Corsair II came with the 8 pole filter in the first IF. Changing the Corsair I is just a matter of finding and swapping the filters. 73, Jerry, K0CQ; /archives//html/TenTec/2002-01/msg00116.html (7,604 bytes)
276. [TenTec] Pegasus Internal Tuner (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Tue, 08 Jan 2002 17:19:09 -0600; Sometimes a SWR meter shows a match on its load side but if it couples tightly to the line, the SWR on its input isn't matched. That is probably what is making the Pegasus show higher SWR readings th; /archives//html/TenTec/2002-01/msg00122.html (8,657 bytes)
277. [TenTec] Pegasus Internal Tuner (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Wed, 09 Jan 2002 10:30:46 -0600; Mismatched loads on solid state PA tend to cause increased voltage peaks or increased current peaks, probably not both compared to the matched condition. These days the transistors are built to withs; /archives//html/TenTec/2002-01/msg00133.html (8,314 bytes)
278. [TenTec] OT FT 243 xtals needed (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 14 Jan 2002 22:31:17 -0600; JAN is still in business but probably has forgotten how to make FT-243. There was a company at Marshfield MO specializing in FT-243 but the proprietor died, I'm not sure the company continues. Its no; /archives//html/TenTec/2002-01/msg00207.html (7,633 bytes)
279. [TenTec] Ten-Tec External Speaker (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Mon, 21 Jan 2002 16:11:16 -0600; Because in a strong magnetic field it takes less current in the voice coil to create any give force to move the speaker cone. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reprod; /archives//html/TenTec/2002-01/msg00280.html (8,160 bytes)
280. [TenTec] Administrivia: Replies to List or to Sender? (score: 1): Author: geraldj@isunet.net (Dr. Gerald N. Johnson, electrical engineer); Date: Fri, 25 Jan 2002 20:02:16 -0600; Jim, its correct as it is. The other option is real pain to respond to the sender alone. Requires copying and pasting and windoze often takes an extra bunch of control characters at the beginning of; /archives//html/TenTec/2002-01/msg00417.html (7,940 bytes)

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