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261. Re: [TenTec] RE: Explication (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Sun, 19 May 2002 09:58:52 -0500; I disagree. There is nothing in the circuits of the diode detector and the modern product detector that has any phase setting of the audio recovered signal. If anything, the product detector (a good; /archives//html/TenTec/2002-05/msg00352.html (8,595 bytes)
262. Re: [TenTec] Re: Dayton news: Orion concern (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Sun, 19 May 2002 22:11:35 -0500; The demand for a sturdy flywheel/knob harks back to the 50s and 60s when the fine radios had neat gear drives and sturdy flywheels so we users couldn't feel the gear teeth. Those radios tended to be; /archives//html/TenTec/2002-05/msg00378.html (8,278 bytes)
263. Re: [TenTec] Re: Orion Concern (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Mon, 20 May 2002 01:10:16 -0500; Actually the designer of the green round cornered Heathkits had worked on the S-Line at Collins, so they have some of the same heritage. There were certain things used in Collins (PTO and mechanical; /archives//html/TenTec/2002-05/msg00382.html (9,996 bytes)
264. Re: [TenTec] New bands (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Mon, 20 May 2002 10:03:29 -0500; ARRL bulletin that I saw on packet said 5.25 to 5.4 MHz. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.; /archives//html/TenTec/2002-05/msg00400.html (7,088 bytes)
265. Re: [TenTec] what is "quiet"? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 02 Apr 2002 00:45:09 -0600; Part of the difference is in the crystal or mechanical filters ringing from static converting clicks to crasssssh. Tentec filters don't do that so much and so seem quieter. 73, Jerry, K0CQ -- Entire; /archives//html/TenTec/2002-04/msg00051.html (9,904 bytes)
266. Re: [TenTec] what is "quiet"? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 02 Apr 2002 12:11:27 -0600; Tchebychev filter approximations with steep skirts have a rotten time response. They DO smear pulses into crashes. The Collins mechanical filter in my 75S3B smears the 360 Hz repetition rate pulses o; /archives//html/TenTec/2002-04/msg00067.html (11,674 bytes)
267. Re: [TenTec] what is "quiet"? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 02 Apr 2002 12:45:42 -0600; Yes, the single conversion receiver with filters at both ends of the IF strip (or a single signal phasing detector such as KK7B's R2 or R2PRO or R2mini http://www.bright.net/~kanga/kanga/kk7b.htm to; /archives//html/TenTec/2002-04/msg00069.html (10,337 bytes)
268. Re: [TenTec] what is "quiet"? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 02 Apr 2002 16:18:26 -0600; The K2 is NOT direct conversion. Its a single conversion superhet, IF at 4.9152 Mhz. 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.; /archives//html/TenTec/2002-04/msg00082.html (9,538 bytes)
269. Re: [TenTec] what is "quiet"? (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 02 Apr 2002 16:48:56 -0600; 73, Jerry, K0CQ -- Entire content copyright Dr. Gerald N. Johnson. Reproduction by permission only.; /archives//html/TenTec/2002-04/msg00086.html (9,746 bytes)
270. Re: [TenTec] My own little "quiet test" (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Tue, 02 Apr 2002 23:54:30 -0600; One should compare a terminated RF stage to the antenna, not an open antenna connector. In many RF stages, especially those critically matched for best noise figure, changing the source impedance cha; /archives//html/TenTec/2002-04/msg00111.html (8,260 bytes)
271. Re: [TenTec] I.C.E. BCB Filter does the trick (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Sat, 06 Apr 2002 13:41:04 -0600; I suppose a hint to one of the other stations on the same channel would cause a check of distant signal strength and a complaint to the FCC about the stations that neglected to drop their power at ni; /archives//html/TenTec/2002-04/msg00191.html (8,257 bytes)
272. Re: [TenTec] Rig Chart (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Sun, 07 Apr 2002 10:44:32 -0500; Phase noise has multiple characteristics. When coming from an analog oscillator its pretty much random noise, causing a spreading of the signal. And that can lead to strong adjacent frequency signals; /archives//html/TenTec/2002-04/msg00207.html (10,387 bytes)
273. Re: [TenTec] Re: [Yaesu] VibroPlex Code Warrior Jr. problems (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Mon, 08 Apr 2002 10:52:20 -0500; There often wasn't a problem when the key was running in a circuit carrying 30 to 100 volts and dozens or more milliamps. In the input to a CMOS keyer, the voltage is only a couple volts and the curr; /archives//html/TenTec/2002-04/msg00242.html (8,091 bytes)
274. Re: [TenTec] My new TEN-TEC 526 (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Mon, 08 Apr 2002 12:25:31 -0500; Some stage is probably oscillating to make the added signals. I've seen that in a prototype Motorola receiver we were using for our local repeater. A proper parasitic suppressor cured it. Else the PL; /archives//html/TenTec/2002-04/msg00247.html (7,360 bytes)
275. Re: [TenTec] BNC vs UHF connectors for HF 100w use (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Thu, 11 Apr 2002 17:00:12 -0500; Neither center pin will carry the 10 amps current required to feed a 50 ohm load 500 volts. Considering the center conductor of RG58 is only 18 or 20 gauge, the WIRE won't carry more than a couple am; /archives//html/TenTec/2002-04/msg00353.html (9,768 bytes)
276. Re: [TenTec] BNC vs UHF connectors for HF 100w use (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Thu, 11 Apr 2002 17:55:57 -0500; N males mate to BNC females without stretching the BNC female center pin excessively. Most of the pin pieces are larger in the N connector. The threaded ring of the N connector holds the connector pi; /archives//html/TenTec/2002-04/msg00361.html (11,063 bytes)
277. Re: [TenTec] BNC vs UHF connectors for HF 100w use (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Thu, 11 Apr 2002 20:48:19 -0500; Yes the UHF has a fat center pin, but it has a rotten ground connection. I burned one black in a 2m mobile with only 18 watts many years ago. The ground connection is only as good as the ring is tigh; /archives//html/TenTec/2002-04/msg00372.html (10,294 bytes)
278. Re: [TenTec] BNC vs UHF connectors for HF 100w use (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Fri, 12 Apr 2002 10:04:34 -0500; The mating parts of the pins of N and BNC are similar sizes. The rest of the pins are not. N is mostly air insulated so the outsides of the pin and socket beyond the mating portion is a different siz; /archives//html/TenTec/2002-04/msg00384.html (10,697 bytes)
279. Re: [TenTec] ARRL Reviews 746PRO (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Fri, 12 Apr 2002 22:28:10 -0500; The WWII Command Set VFO was and still IS as good as a Collins PTO, far better than any other receivers contemporary to the 10B. It couldn't be made today, though with good temperature control and so; /archives//html/TenTec/2002-04/msg00397.html (8,449 bytes)
280. Re: [TenTec] Sidetone revisited (score: 1): Author: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>; Date: Sun, 14 Apr 2002 21:37:06 -0500; The sawtooth oscillator should be at full amplitude the first half cycle of the tone. And the start up chirp done in that time period. It won't hang over either when unkeyed. The twin-T undoubtedly t; /archives//html/TenTec/2002-04/msg00453.html (9,170 bytes)

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