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321. Re: [TenTec] Centaur (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00351.html (8,389 bytes)

322. Re: [TenTec] Centaur (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00353.html (8,369 bytes)

323. Re: [TenTec] 1208 Transverter / 6m Operation (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00006.html (7,873 bytes)

324. Re: [TenTec] Tone(s) on Pegasus receive (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00081.html (9,059 bytes)

325. Re: [TenTec] Corsair Filter Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00098.html (8,104 bytes)

326. Re: [TenTec] Corsair Filter Question (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00101.html (8,049 bytes)

327. Re: [TenTec] Pegasus Internal Tuner (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00107.html (9,086 bytes)

328. Re: [TenTec] Pegasus Internal Tuner (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00118.html (8,743 bytes)

329. Re: [TenTec] OT FT 243 xtals needed (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00192.html (8,034 bytes)

330. Re: [TenTec] Ten-Tec External Speaker (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00265.html (8,634 bytes)

331. Re: [TenTec] Administrivia: Replies to List or to Sender? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00402.html (8,402 bytes)

332. Re: [TenTec] Fwd: Topband: More About Clix (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 29 Jan 2002 20:41:58 -0600
A good audio spectrum analyzer, such as one using a computer sound card with rapid updates and fine resolution in a falling water display should show it readily. Or alternatively, an audio oscillator
/archives//html/TenTec/2002-01/msg00547.html (9,308 bytes)

333. Re: [TenTec] Re: FYI - key click thread on Ten-Tec reflector (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
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/msg00612.html (11,799 bytes)

334. Re: [TenTec] Values of filter capacitors? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 02 Dec 2001 14:24:48 -0600
In the ladder filter that Tentec uses, the crystal frequencies determine the center frequency, while the capacitors determine the bandwidth. The larger the capacitors, the smaller the bandwidth. Ther
/archives//html/TenTec/2001-12/msg00008.html (7,199 bytes)

335. Re: [TenTec] Pegasus / Omni V and RigBlaster (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 02 Dec 2001 14:44:11 -0600
The source and load impedances are different. Worked out with the relative high impedance of the microphone that the two radio with different load impedances worked with the same. The output impedanc
/archives//html/TenTec/2001-12/msg00009.html (7,530 bytes)

336. Re: [TenTec] Omni V operation (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Fri, 07 Dec 2001 10:05:43 -0600
Backing off on the RF gain control IS cheating. Its taking away some of the weak signal copying, kind of setting a threshold on signal AND noise. I've been doing that on my HF radios (Collins, Tentec
/archives//html/TenTec/2001-12/msg00058.html (8,355 bytes)

337. Re: [TenTec] Mic impedance for TT Omni-D? (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Sun, 09 Dec 2001 17:20:55 -0600
High impedance can load low impedance. Just the voltage will be on the low side, requiring lots of microphone gain. Many Shure microphones are switchable dual low and high impedance. High impedance i
/archives//html/TenTec/2001-12/msg00099.html (7,242 bytes)

338. Re: [TenTec] New TT QRP Rig (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Mon, 10 Dec 2001 15:54:08 -0600
The first kenwood solid state was the fpm2000. The later fpm 300 was hybrid. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.
/archives//html/TenTec/2001-12/msg00109.html (8,660 bytes)

339. Re: [TenTec] New TT QRP Rig (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Tue, 11 Dec 2001 09:24:34 -0600
Of course, YES it was Hallicrafters. Guess I need to heed a new sign at this computer saying, "Be sure brain is in gear before typing..." I had one of the good FPM-300. There were many that had bad c
/archives//html/TenTec/2001-12/msg00117.html (9,319 bytes)

340. Re: [TenTec] Carrier Supression in the Omni V (score: 1)
Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
Date: Thu, 13 Dec 2001 22:37:15 -0600
There might need to be some capacitive balance besides the resistive balance. Might be that the carrier isn't as far down the side of the filter on one sideband as the other and there's some leakage
/archives//html/TenTec/2001-12/msg00126.html (7,582 bytes)

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