Reply to "Correlator Noise floor inflation by Legacy Signal Interfering with DCS"

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Adrian! posted:
FEM is usually about 1-2% accurate to real world. I'm using HFSS 14 for this.

Well, I looked at this, and then I look at that...

Adrian! posted:
Okay guys. At AGHR (2700 ish ft) we got 74.8nF outside rail and 58.6nF center rail measured as is. Certainly more than the raw capacitance than I expected from the rail structure itself . I tried adding cap on the outside rail and DCS (about 13V excursion) is happy until we get to about 90nF .... so roughly 2:1 cap imbalance is where the problems seem to start.

I guess in the real world Finite element modeling has it's limitations.

7/14/181:45 PM

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