Anyone out there know how to "properly" interface coax SPDIF to TTL? Here's
what I tried:

SPDIF coax input to Pulse Eng isolation txfmr. Txfmr terminated with 75 ohm
resistor. Txfmr signal through 0.01 microfarad DC blocking cap, into + input
of a National RS-422 receiver. - input of receiver thought 0.01 cap to
ground.

Now, as it happens, the TTL out from the receiver only gives a clean signal
if I remove the terminating resistor. Furthermore, the open-loop signal
coming from the SPDIF source is 1 V p-p, rather than the 2 V I would have
expected. If I put in the 75-ohm terminator, too much power is consumed by
it, and it won't trigger the receiver.

Any ideas? Please let me know if you need more details! TIA!

--
Rick

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