Reply to "Striking signal difference for PS3 vs. PS2 locomotives--common experience?"

cnwdonOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

gunrunnerjohn posted:
Here are a few of the threads where this was discussed.
Correlator Noise floor inflation by Legacy Signal Interfering with DCS
Circuit Filtering to Separate Legacy/TMCC and DCS signals
DCS/Legacy Interference

Thanks, reviewed. I notice a couple of things
1. At one point you suggested including one of Adrian’s solutions in your DM TMCC buffer, but I didn’t see the follow-on to that line of thought. Abandoned for some reason?

2. I think it was Adrian who noted that reducing buffer output voltage as we’re about to try here, has the problem of reducing the S/N ratio for the TMCC signal. (Not sure I understand, would think ratio unchanged, but absolute difference between signal and noise amplitudes WOULD be reduced, which may still cause a problem.) Yes, might be a drawback? (Still worth trying, can’t know net result without a trial).

3/3/2011:07 AM

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Correlator Noise floor inflation by Legacy Signal Interfering with DCS

Circuit Filtering to Separate Legacy/TMCC and DCS signals

DCS/Legacy Interference

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