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Does ANYONE know the model # of the old Sony Coax In/Out & 7-Pin active cable?

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commongrounder:
Sony never made a 7-pin coaxial digital I/O cable. They made a coax input only version because there already was input buffer circuitry in the DAT machines to handle the signal. The coax in-only version needed just a single 75-ohm termination resistor. The Toslink version used a monolithic optical transmitter/receiver module with its own driver, so all it needed was a simple buffered output SPDIF TX data stream from the recorder. I wanted coaxial input and output for my D3, so I took my optical cable apart and ripped out the optical TX/RX  module. Since one of the seven pins carries 5-volts, I could build and power a tiny box with a U04 logic driver chip and toroidal output isolation transformer to deliver a properly formatted SPDIF coaxial output signal. The input was 75-ohm terminated and buffered with a spare gate before feeding it on to the recorder. I wired on some miniature 75-ohm coax with RCA plugs to finish it up. That unit ran perfectly for a number of years until I bought a rack mount DAT (Panasonic SV-3500 - what a tank!). I wish I had a photo of it. I loaned it out to someone so they could do some digital transfers, and I never saw it again.

lilyelliott4:

--- Quote from: datbrad on September 18, 2024, 08:23:51 AM ---The cable I got from Doug for my D8 way back in the day was the passive version, made using the Sony branded coax cable, with the single input RCA chopped off and wired to a splitter that passed the signal without routing it through the deck. Think of it as if a pair of coax cables were joined with a RCA F>F coupling connector to extend length. I am 100% certain that the only in-out cable Sony ever made for the D7/D8 was optical. The coax was input only. Hope this helps.

--- End quote ---
Thanks for the info! That clears things up. So it sounds like the passive cable you got from Doug was more of a DIY solution, and the original Sony coax was input-only for the D7/D8, with optical being the only true in-out option. Appreciate the clarification!

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