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KB2VXA > MFJ 24.07.12 14:02l 25 Lines 976 Bytes #999 (0) @ WW
BID : 22165_VK6ZRT
Read: GUEST I6KZR
Subj: Re: KF4LLF > MFJ 1270C problems
Path: IZ3LSV<IK6ZDE<VE3UIL<VK6ZRT
Sent: 120724/1241Z @:VK6ZRT.#BUN.#WA.AUS.OC #:22165 [Boyanup] $:22165_VK6ZRT
From: KB2VXA@VK6ZRT.#BUN.#WA.AUS.OC
To : MFJ@WW
Hi Seth and the dimosaurs,
Dinosars use TNCs, packeteers use software. (;->)
Seriously, I cut my teeth on a 1270, no letter suffix so that somewhat
familiarity points to the modem, the very heart of a TNC. Listen closely
to a 1200bd packet burst and notice two modem tones, it's all based on
TTY or RTTY if you prefer. If you remember the old dial-up modems you'd
hear the same thing on a telephone extension. That having been said, the
modem isn't shifting tones as it should, can't pinpoint the chip, never
had a schematic. Well, at least I pointed you in the right direction so
when you locate the chip on the board I suppose you'll have to find and
canibalize or modernize, a computer to radio interface is easier to build
than fixing a modem out of production for years.
73 de Warren
Station powered by JCP&L atomic energy, operator powered by natural gas.
Message timed by NIST: 12:38 on 2012-Jul-24 GMT
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