- 361. Re: [TenTec] Omni VI problems, continued (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Fri, 30 May 2008 11:19:29 -0600
- In the LO Mixer path there is never anything but sinewaves except at the output of mixers before the output filter. There is no SSB or keyed signal. You may find fewer signals in receive mode so your
- /archives//html/TenTec/2008-05/msg00600.html (10,657 bytes)
- 362. Re: [TenTec] DX radios (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Fri, 30 May 2008 21:35:07 -0600
- Call that a Beat Frequency Oscillator! The S-3B/C also has that option. Pass band tuning in the previous 75A4 was a mechanical coupling between the BFO and the main VFO that moved them together at th
- /archives//html/TenTec/2008-05/msg00623.html (10,000 bytes)
- 363. Re: [TenTec] Coax connectors (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 31 May 2008 10:42:14 -0600
- Virtually every radio in my shack has UHF (below 250 MHz) and an immediate UHF to BNC adapter and most of the HF cables use BNC on RG58A/U or C/U (stranded center conductor). Partly because N was use
- /archives//html/TenTec/2008-05/msg00640.html (10,747 bytes)
- 364. Re: [TenTec] Coax connectors (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 31 May 2008 10:51:54 -0600
- I've found that all multi-pin connectors whether DIN, or D type survive soldering better when mated. Heat doesn't get to the mated connector and so the pins being soldered can't migrate when the plas
- /archives//html/TenTec/2008-05/msg00641.html (12,915 bytes)
- 365. Re: [TenTec] Coax connectors (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 31 May 2008 12:38:49 -0600
- Mouser. www.mouser.com
- /archives//html/TenTec/2008-05/msg00648.html (10,191 bytes)
- 366. Re: [TenTec] 4CX1600B (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 31 May 2008 13:00:14 -0600
- google showed: http://www.sed-usa.com/index.asp?strType=Content&strPage=4CX1600B http://www.garant-funk.com/svetlana/4CX1600B.html But this post says it wasn't available in 2003 already. http://chat.
- /archives//html/TenTec/2008-05/msg00649.html (8,939 bytes)
- 367. Re: [TenTec] Coax connectors (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 31 May 2008 15:33:26 -0600
- That's Newark, Allied, and Digi-Key amongst others. Mouser has no minimum order for domestic shipments. International they might, but you said you would have the parts hand carried out of the US. 73,
- /archives//html/TenTec/2008-05/msg00660.html (9,531 bytes)
- 368. Re: [TenTec] Coax Connectors (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 31 May 2008 16:01:17 -0600
- While the N male will mate with the BNC and TNC female, there is some impedance mismatch because the BNC and TNC connections are filled with dielectric, while the N connection interface is filled wit
- /archives//html/TenTec/2008-05/msg00663.html (10,437 bytes)
- 369. Re: [TenTec] another amp question (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Thu, 03 Apr 2008 17:45:50 -0600
- A diode makes a rotten fuse. It takes a great deal of current to burn it open and when its across the metering you don't want that to fuse open! The diode more often melts its junction and turns into
- /archives//html/TenTec/2008-04/msg00026.html (8,373 bytes)
- 370. Re: [TenTec] another amp question (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Thu, 03 Apr 2008 17:59:15 -0600
- I have one possible answer. In most ham sized amplifiers, parasitics are suppressed by small coil (typically 5 turns of wire) wound around a 2 watt carbon composition resistor. That's usually the pla
- /archives//html/TenTec/2008-04/msg00027.html (10,966 bytes)
- 371. Re: [TenTec] 811 Amplifier redux (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Fri, 04 Apr 2008 14:40:03 -0600
- So any time you hit the tune button or run CW and don't switch to transmit manually, you abuse the relays with hot switching. Worse if the input relay was a little faster than the output relay, you m
- /archives//html/TenTec/2008-04/msg00034.html (18,245 bytes)
- 372. Re: [TenTec] Cleaning an Argonaut 509 (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 08 Apr 2008 09:23:31 -0600
- Keep it dry. Don't toss in a liquid to run into IF transformers and shielded coils. Don't blow the dust out with air, to hide it in those same places. Instead loosen the dust with a short bristled br
- /archives//html/TenTec/2008-04/msg00074.html (9,015 bytes)
- 373. Re: [TenTec] Ten Tec 238A settings? (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Fri, 11 Apr 2008 10:40:53 -0600
- First, if you had a constant R load, you still have a 14% frequency change from 3.5 to 4 MHz. But you have a load that's probably passing through resonance so the phase angle of the load is varying w
- /archives//html/TenTec/2008-04/msg00109.html (11,641 bytes)
- 374. Re: [TenTec] Ten Tec 238A settings? (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Fri, 11 Apr 2008 15:41:26 -0600
- Other than by testing for stray capacitance to ground from each side of the floating tuner I don't think you can detect the unbalance of a floating single ended tuner compared to a physically balance
- /archives//html/TenTec/2008-04/msg00122.html (11,133 bytes)
- 375. Re: [TenTec] Ten Tec 238A settings? (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Fri, 11 Apr 2008 17:38:09 -0600
- I've built a couple 6m tuners. Usually about 4 or 6 turns of #12 1" diameter with a little gap in the middle for an adjustable link. Tuned by a split capacitor probably 35 pf each section, either dua
- /archives//html/TenTec/2008-04/msg00125.html (9,995 bytes)
- 376. Re: [TenTec] Twinlead and Balanced Tuners (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sat, 12 Apr 2008 16:53:07 -0600
- The double bazooka is a sham. It can have a slightly increased bandwidth, but that's from the fatter ends made of shorted twinlead, not the connections at the center. And its made mostly of insulatio
- /archives//html/TenTec/2008-04/msg00149.html (11,164 bytes)
- 377. Re: [TenTec] Omni-6 rotary encoder (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sun, 13 Apr 2008 11:26:17 -0600
- Seems like I recall reading that there have been solder or cable connection failures between the encoder and its connections to the PC board. 73, Jerry, K0CQ
- /archives//html/TenTec/2008-04/msg00153.html (7,600 bytes)
- 378. Re: [TenTec] Ten Tec 238A settings? (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Sun, 13 Apr 2008 12:30:36 -0600
- A tuner with parts big enough to work 80 meters has too much minimum C and minimum L for tuning at 6m. Its tough having tuning range on 10m. When a 100 watt tuner like I described for 6m needs $25 in
- /archives//html/TenTec/2008-04/msg00155.html (9,569 bytes)
- 379. Re: [TenTec] Ten Tec 238A settings? (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Mon, 14 Apr 2008 10:29:40 -0600
- An application hazard with spark plugs for the gap is that most plugs sold today have series resistors, often 5 or 10K to minimize radio interference from the running engine. Then the plug is made to
- /archives//html/TenTec/2008-04/msg00187.html (12,284 bytes)
- 380. Re: [TenTec] spark plugs (score: 1)
- Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
- Date: Tue, 15 Apr 2008 11:51:01 -0600
- The only sure check is an ohmmeter. Some lines of Champion plugs have air gaps in the plug body to increase the coil voltage for use in old engines burning oil. Most vintage tractor owners now despis
- /archives//html/TenTec/2008-04/msg00223.html (7,712 bytes)
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