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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TRLog\]\s+Need\s+help\s+with\s+Keying\/PTT\/Paddle\s+interface\s*$/: 11 ]

Total 11 documents matching your query.

1. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: aa4ga@contesting.com (Lee Hiers, AA4GA); Date: Mon, 25 Jan 1999 04:07:25 +0000; Hello there... We have built two interface boxes that have Keying/PTT/Paddle interfaces. I built one a couple of years ago and W4WA built one recently (in other words, they're not using parts from th; /archives//html/TRLog/1999-01/msg00131.html (8,695 bytes)
2. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: n6tr@teleport.com (n6tr@teleport.com); Date: Sun, 24 Jan 1999 20:15:02 -0800 (PST); This sounds like the on voltage of the transistors are too high. This can happen due to low beta in the transitors. You can probably fix the problem by putting the emitter of the CW transistor direc; /archives//html/TRLog/1999-01/msg00132.html (9,398 bytes)
3. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Mon, 25 Jan 1999 12:41:22 +0000; Boy you got that right! My opto box would key the rig from my LPT2 but the "on" voltage was too high to trigger the VOX. I changed port cards and then the interface wouldn't do anything but key the s; /archives//html/TRLog/1999-01/msg00134.html (9,312 bytes)
4. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Mon, 25 Jan 1999 15:25:15 -0000; Has anyone tried a darlington pair (beta multiplier) in place of the keying transistor? This should draw very little current from the interface. Mike, W4EF Boy you got that right! My opto box would k; /archives//html/TRLog/1999-01/msg00135.html (9,911 bytes)
5. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Mon, 25 Jan 1999 16:37:01 -0000; Good point - the darlington adds one diode drop to the Vce saturation voltage! Exactly how low do the modern transceivers need to go anyway? One would think that pulling them down to 1 volt would do; /archives//html/TRLog/1999-01/msg00136.html (9,216 bytes)
6. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: ve6jy@freenet.edmonton.ab.ca (Don Moman); Date: Mon, 25 Jan 1999 09:53:41 -0700 (MST); Yes. Have built about 10 boxes for here and for other locals, my first effort would only key on *some* of the computers, so changed to a darlington (MPSA13 if I recall correctly). I also do not use t; /archives//html/TRLog/1999-01/msg00137.html (8,842 bytes)
7. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: n6tr@teleport.com (n6tr@teleport.com); Date: Mon, 25 Jan 1999 09:00:35 -0800 (PST); The strobe driver add some. Maybe a FET is the answer. Tree -- FAQ on WWW: http://www.contesting.com/trlogfaq.html Submissions: trlog@contesting.com Administrative requests: trlog-REQUEST@contesting; /archives//html/TRLog/1999-01/msg00138.html (8,387 bytes)
8. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: rmccabe@dwx.com (Rich McCabe); Date: Mon, 25 Jan 1999 11:05:52 -0600; Tree, Is there any hope for us guys with the first generation Paragons ? Anyway to make the TR-LOG S&P functions, etc. work with this radio? Thanks and 73, Rich KD0ZV --Original Message-- From: owner; /archives//html/TRLog/1999-01/msg00139.html (9,340 bytes)
9. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: sdelling@facstaff.wisc.edu (Scott Ellington); Date: Mon, 25 Jan 1999 11:21:37 -0600; The 2N7000 works well. Just buy some spares and watch out for ESD when installing. 73, Scott K9MA -- Scott Ellington sdelling@facstaff.wisc.edu Madison, Wisconsin USA -- FAQ on WWW: http://www.contes; /archives//html/TRLog/1999-01/msg00140.html (8,267 bytes)
10. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: nkennedy@cswnet.com (Nick Kennedy); Date: Tue, 26 Jan 1999 14:51:51 -0600; I don't think a darlington adds a drop to Vce, it would add one diode drop to Vbe. In a darlington, two base-emitter junctions are in series but there is nothing in series with the "main" collector-e; /archives//html/TRLog/1999-01/msg00142.html (8,656 bytes)
11. [TRLog] Need help with Keying/PTT/Paddle interface (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Wed, 27 Jan 1999 04:04:41 -0000; Hi Nick, Actually, the darlington does add a diode drop to the Vce of the output trasistor, since the Vce of the output transistor is in parallel with the sum of its own Vbe drop and the input transi; /archives//html/TRLog/1999-01/msg00145.html (9,679 bytes)

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