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Total 6 documents matching your query.

1. RE: [RTTY] QUESTION & ANSWER (score: 1): Author: "Marijan Miletic, S56A" <s56a@bit.si>; Date: Fri, 31 Dec 2004 00:25:22 +0100; http://www.aa5au.com/rttyinterface.html It would be healthy to add another 1 kOhm resistor from base to ground in order to conform with -5 V max inverse voltage from PC COM port. Shunt capacitor of; /archives//html/RTTY/2004-12/msg00264.html (6,698 bytes)
2. Re: [RTTY] QUESTION & ANSWER (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Thu, 30 Dec 2004 17:37:37 -0800; ___________________________________________________________ I agree about the capacitor from collector to ground, but the resistor from base to ground isn't really necessary. Many hams don't know it,; /archives//html/RTTY/2004-12/msg00267.html (8,125 bytes)
3. Re: [RTTY] QUESTION & ANSWER (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Thu, 30 Dec 2004 19:38:44 -0800; ___________________________________________________________ A diode is fine, except it's another thing to fail. They are pretty reliable, so not much to worry about. -- Bill, W6WRT __________________; /archives//html/RTTY/2004-12/msg00271.html (7,604 bytes)
4. Re: [RTTY] QUESTION & ANSWER (score: 1): Author: "Marijan Miletic', S56A" <s56a@bit.si>; Date: Fri, 31 Dec 2004 04:23:36 +0100; My preffered solution would be protective diode to keep base at -0,7 V maximum. Makes me sleep better when RF present! I'd hate to strech Zener avalanche much. 73 de Mario, S56A, N1YU in schematics!; /archives//html/RTTY/2004-12/msg00275.html (8,775 bytes)
5. Re: [RTTY] QUESTION & ANSWER (score: 1): Author: "Tom Homewood" <w1to@adelphia.net>; Date: Fri, 31 Dec 2004 10:01:30 -0500; Adding the base to emitter resistor helped me solve some hang up problems when going from transmit to receive. 73, Tom, W1TO see: schematics! _______________________________________________ RTTY mail; /archives//html/RTTY/2004-12/msg00277.html (7,971 bytes)
6. Re: [RTTY] QUESTION & ANSWER (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Fri, 31 Dec 2004 09:52:52 -0800; ___________________________________________________________ Adding the base to emitter resistor simply creates a 2:1 voltage divider which reduces the strength of the keying signal and any RF or othe; /archives//html/RTTY/2004-12/msg00278.html (8,167 bytes)

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