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Author Topic: TNC (SCS PTC-IIe) <-> ICOM IC-746 CONNECTION  (Read 1926 times)
K9AMZ
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« on: November 23, 2001, 11:23:02 PM »

Does anybody have any hints how to connect an SCS PTC-IIe to an ICOM 746?

I have an 8-pin plug that I connect to the ACC(1) 8-pin plug on the back of the 746. There's a 7-pin ACC(2) plug on the back of the radio as well, but I don't have a cable for that. Finally, there's of course the mic plug, which - if I can avoid it - I'd rather not use for this.

Here's what happens: I can "LISTEN" to PACTOR, CW, etc. traffic via a terminal program, and the connection PC <-> TNC (via RS-232) works fine (COM port, baud rate etc is set correctly). However, it seems as if I cannot send anything from the TNC through the radio. In LSB (USB), the TNC triggers the radio's TX, but no signal seems to be sent; in RTTY mode the radio seems to be sending something (the P-meter and ALC gauge move), but I don't get any responses.

Any ideas?

Thanks much. Alain, K9amz./
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K9AMZ
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« Reply #1 on: November 24, 2001, 03:38:43 PM »

DISREGARD! Bad solder connection in plug - once that was fixed everything's humming along. K9amz.
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K6AUD
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« Reply #2 on: December 11, 2001, 12:31:12 PM »

Farallon Electronics in California has a plug and play cable to interface the PTC-IIe with the 746. It is part #9090 and costs $42.00. The cable will also supply power from the radio to the modem. There number is 415-331-1924. The pin out wiring diagram is available on the website    www.sailmail.com   Go to the Sailmail primer and look at application notes for radios. The wiring is the same as for the M700PRO or M710 Marine radios.
73, Gary
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