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1. [RTTY] FSK interface circuit troubles (score: 1): Author: "Alfred Frugoli" <ke1fo@arrl.net>; Date: Tue, 9 Dec 2008 22:16:29 -0500; Hello folks, I'm trying to build up the interface listed at the bottom of http://www.aa5au.com/rttyinterface.html#PNP_Transistor_FSK_Circuit using a PNP transistor. I'm using generic PNP transistors; /archives//html/RTTY/2008-12/msg00141.html (9,171 bytes)
2. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Tue, 09 Dec 2008 20:23:28 -0800; Hi Alfred: I suspect your problem there is with the transistor. Not that it is bad necessarily, but mis-wired. Transistors come in a variety of pin configurations and it is real easy to get it wrong.; /archives//html/RTTY/2008-12/msg00145.html (10,892 bytes)
3. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: "Robert Chudek - K0RC" <k0rc@pclink.com>; Date: Tue, 9 Dec 2008 22:54:04 -0600; Al, A USB to Serial converter is a hit-or-mis proposition. Many of them do not provide enough current on the control signals to drive a transistor. If you have a 'real' COM port to make the connectio; /archives//html/RTTY/2008-12/msg00147.html (12,346 bytes)
4. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: Phil Sussman <psussman@pactor.com>; Date: Wed, 10 Dec 2008 04:56:40 -0500; Al, If the circuit worked using an NPN transistor, then using a PNP requires inverted polarity on the keying line. So, I have some suggestions: 1. Verify that your FSK keying line still works by manu; /archives//html/RTTY/2008-12/msg00148.html (11,324 bytes)
5. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: Phil Sussman <psussman@pactor.com>; Date: Wed, 10 Dec 2008 05:11:36 -0500; Al, My guru says 1K coupling resistor between Q1 collector and Q2 base with a 100K pull up resistor from Q1 collector to a well filtered source of B+. Good luck, 73 de Phil - N8PS ___________________; /archives//html/RTTY/2008-12/msg00149.html (7,239 bytes)
6. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: "Alfred Frugoli" <ke1fo@arrl.net>; Date: Wed, 10 Dec 2008 09:19:20 -0500; The one thing I didn't mention is that I'm running a KW TS-940, this seems to be a detail of interest in all the replies I've gotten. 73 de Al, KE1FO -- Visit my amateur radio contesting blog at ke1f; /archives//html/RTTY/2008-12/msg00151.html (10,951 bytes)
7. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: "k0bx@arrl.net" <k0bx@arrl.net>; Date: Wed, 10 Dec 2008 06:43:40 -0800 (PST); The kenwood TS-940 uses a reverse FSK from everyone else. In my TS-850 there was a menu setting to reverse the FSK. I am not sure of the TS-940 but I think it had it. There is some writeups on FSK an; /archives//html/RTTY/2008-12/msg00152.html (12,538 bytes)
8. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: john <w8wej@citynet.net>; Date: Wed, 10 Dec 2008 14:55:43 +0000; menu 11 on my 850, and I do remember having the same type of problem with my 940, but can not remember the menu# sure did gave me fits gl 73 john w8wj _______________________________________________; /archives//html/RTTY/2008-12/msg00153.html (8,391 bytes)
9. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: Phil Sussman <ps@pactor.com>; Date: Wed, 10 Dec 2008 04:51:45 -0500; Al, If the circuit worked using an NPN transistor, then using a PNP requires inverted polarity on the keying line. So, I have some suggestions: 1. Verify that your FSK keying line still works by manu; /archives//html/RTTY/2008-12/msg00155.html (12,114 bytes)
10. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: Kok Chen <chen@mac.com>; Date: Wed, 10 Dec 2008 08:53:53 -0800; The FSK polarity in the Omni V and VI were "correct." In their "normal" setting, the Yaesu transceivers I have used are also "reversed." But the Yaesus have a way to change the transmit FSK polarity; /archives//html/RTTY/2008-12/msg00157.html (8,348 bytes)
11. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: "Alfred Frugoli" <ke1fo@arrl.net>; Date: Wed, 10 Dec 2008 11:57:11 -0500; When I had the first circuit built I tried reversing the keying on the "modem" (in this case software) end. What resulted was a very hard to copy signal (as tested sending from 1 rig to another in th; /archives//html/RTTY/2008-12/msg00158.html (9,994 bytes)
12. Re: [RTTY] FSK interface circuit troubles (score: 1): Author: Kok Chen <chen@mac.com>; Date: Wed, 10 Dec 2008 09:33:41 -0800; Interesting. Perhaps the transistor was only marginally pulling down the keying line? If some characters, such as O (oh) and 9 gets through more reliably than other characters, such as Space or Z the; /archives//html/RTTY/2008-12/msg00159.html (9,845 bytes)

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