Tom Wheeley wrote:
>Is it possible to accomplish a similar trick with a digital signal?
With coax digital signals the impedances are matched, so running two
receiving units in parallel from one transmitter will cause the signal level
to be halved. This alone could be enough to stop it working. Over long
distances (more than about half the wavelength of the signal) the mismatched
impedances will cause standing waves in the cable, a further reduction in
the signal levels and jitter from the reflected signals.
A better way to accomplish this would be to build a buffer consisting of an
impedance matched receiver and two transmitters much like some of the
designs linked from the MDCP for optical to coax convertors etc.
I should note that I don't have a good knowledge of transmission line
theory, so the above might not be quite right. I'd appreciate if some more
knowledgable readers could point out any mistakes.
-cb
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