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Total 758 documents matching your query.

281. Re: [TenTec] Airpax Breaker Part and Source (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 14 Dec 2010 10:56:35 -0600
Yes they do, but you have to look past the marketing and look at the data sheet. According to the trip curve for their "instant" breakers, the typical operating time for current of 2X the breaker rat
/archives//html/TenTec/2010-12/msg00329.html (10,436 bytes)

282. Re: [TenTec] Replacment cw filter (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 14 Dec 2010 11:26:22 -0600
Some years ago I developed a switchable cutoff frequency set of low pass filters to go in the speaker line. The lowest cutoff was in the 400 - 500 Hz range. CW was erie with that lowest one in the ci
/archives//html/TenTec/2010-12/msg00331.html (9,996 bytes)

283. Re: [TenTec] Paragon II RS-232 noise (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 15 Dec 2010 12:16:38 -0600
How about checking the control board grounding, as well as the cable shield grounding? 73, Jerry, K0CQ The noise is very noticeable. Not faint at all. I haven't tried another computer, but, I control
/archives//html/TenTec/2010-12/msg00349.html (9,559 bytes)

284. Re: [TenTec] Paragon II RS-232 noise (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 15 Dec 2010 15:23:19 -0600
Two other things that might help involve the RS-232 drivers. In the classic RS-232 standard the rate of rise and fall was limited (which effectively limited serial port speeds sometimes below 1200 ba
/archives//html/TenTec/2010-12/msg00353.html (10,904 bytes)

285. Re: [TenTec] Centurion 422 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 15 Dec 2010 18:13:18 -0600
Used to be a 2N3055 and a MPSU101 - and 8.2 v zener. Later they used a ON Semi MJ15001 instead of the 2N3055 and a MPSW42 for the MPSU101. I suspect you will find the 3055 shorted. I would replace bo
/archives//html/TenTec/2010-12/msg00357.html (9,680 bytes)

286. Re: [TenTec] Centurion 422 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 15 Dec 2010 20:13:15 -0600
I can't tell from the downloadable manual, but all my life 1 ma meters have been more like 50 ohms if quality meters. 3.3 volt zeners may induce some modification of the meter reading because they te
/archives//html/TenTec/2010-12/msg00360.html (8,755 bytes)

287. Re: [TenTec] Eagle vs any other (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 17 Dec 2010 19:45:13 -0600
When the selectivity is way up front, the later stages introduce their own broad band noise, all the way to the audio output amp, and digital artifacts from DSP contribute a lot to that. Many a recei
/archives//html/TenTec/2010-12/msg00397.html (9,566 bytes)

288. Re: [TenTec] Eagle vs any other (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 17 Dec 2010 20:40:41 -0600
I'll have to think about that. There are at least three SDR designs that are drastically different in how they work and how well they work. But what I said in 2002 still applies to the analog hardwar
/archives//html/TenTec/2010-12/msg00401.html (9,329 bytes)

289. Re: [TenTec] Eagle vs any other (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 18 Dec 2010 12:03:10 -0600
Most receiver designs use mixers. Most receiver designs use RF and audio amplifiers. Pure analog receivers use mixers because its most convenient to get selectivity and gain at fixed frequencies. Tha
/archives//html/TenTec/2010-12/msg00415.html (15,820 bytes)

290. Re: [TenTec] Eagle vs. any other (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 19 Dec 2010 01:13:24 -0600
PLL, DSP, and SDR implementations are very much moving targets both hardware and software and probably will continue to improve, likely moving more towards the SDR-IQ concept and away from the Orion
/archives//html/TenTec/2010-12/msg00429.html (9,757 bytes)

291. Re: [TenTec] OT Off topic (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 19 Dec 2010 01:44:56 -0600
Tinned copper braid will not corrode as fast but braid that's tinned with solder will break off at the end of the solder. Its best to use crimp lugs after folding and rolling the braid so it gets hel
/archives//html/TenTec/2010-12/msg00430.html (7,753 bytes)

292. Re: [TenTec] 6M transverter with OMNI 6? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 19 Dec 2010 23:23:05 -0600
I have one objection to the Omni V and VI with a transverter for VHF. Its common to switch modes from USB to CW and to make contacts while transmitting CW and copying USB. When the rig goes to LSB fo
/archives//html/TenTec/2010-12/msg00439.html (13,085 bytes)

293. Re: [TenTec] Argonaut V-Jupiter-Signalink USB and Digital (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 20 Dec 2010 11:36:03 -0600
If the input impedance is really 47 ohms, you could use a T or an L or simply a single series resistor. Think about 4700 ohm series resistor. With that 47 ohm input Z that would drop the audio 100:1.
/archives//html/TenTec/2010-12/msg00443.html (10,458 bytes)

294. Re: [TenTec] Argonaut V-Jupiter-Signalink USB and Digital (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 21 Dec 2010 10:47:51 -0600
Then the simple series resistor goes up to 4.7 megohms. The stray capacitance may give a high boost. Might be better to use two resistors, say 4.7K shunt after 470K series, or 1k shunt after 100K ser
/archives//html/TenTec/2010-12/msg00457.html (8,885 bytes)

295. Re: [TenTec] 6M transverter with OMNI 6? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 21 Dec 2010 12:46:05 -0600
I have the 2m IF version. Won't work with the Omni 6. It takes 1 to 10 watts IF drive. I may have abused it but seems like there's not enough gain in the DC switching circuit so the transmitter stage
/archives//html/TenTec/2010-12/msg00461.html (9,925 bytes)

296. Re: [TenTec] Titan 425 Amp (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 24 Dec 2010 14:22:36 -0600
If you have replaced the transformer with no effect, you might try unhooking the transformer primary (just one side is enough) to isolate the supply from the primary switching. In a simplified schema
/archives//html/TenTec/2010-12/msg00513.html (10,624 bytes)

297. Re: [TenTec] non qsk amp (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 24 Dec 2010 20:42:46 -0600
More series resistance or shunt C or both in the delay circuit. Don't have either brought up right now. But the series R should be what you adjust now. 73, Jerry, K0CQ On 12/24/2010 8:19 PM, k8bbm@sr
/archives//html/TenTec/2010-12/msg00520.html (7,992 bytes)

298. Re: [TenTec] non qsk amp (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 24 Dec 2010 21:06:59 -0600
On the Corsair II control board, it looks like increase C6 or R12 preferably R35 better than R12. C6 is 33 mfd, R35 is a 10K pot. Don't have anything on hand for the 544, but its probably similar. 73
/archives//html/TenTec/2010-12/msg00521.html (8,047 bytes)

299. Re: [TenTec] TenTec 1254 ---THANKS (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 27 Dec 2010 23:27:48 -0600
My FT-857 manual says .55 amp receive squelched and 1 amp receive. There is a 5th pin on the power connector that when grounded cuts the power to 20 watts through 2m and 10 watts on 432, I think that
/archives//html/TenTec/2010-12/msg00531.html (13,019 bytes)

300. Re: [TenTec] TenTec 1254 ---THANKS (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Thu, 30 Dec 2010 19:51:40 -0600
Experimental data. FT-857D. Takes 700 ma on receive all bands all modes. 50 to 75 ma more for full audio. Battery sense appears to have no effect on the receive current. On 2m ssb transmit with no au
/archives//html/TenTec/2010-12/msg00563.html (12,418 bytes)

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