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Old Feb 10, 2012, 02:56 PM
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Lakewood, Colorado
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Quote:
Originally Posted by V_Okto View Post
low pass filter on my RX side

?? thats not needed. you need the filter at the TX side!
Ya, it seems many people are confused about LPF and HPF these days.
You put a LPF on 1.2-1.3Ghz video Tx to keep 2nd order harmonics out of 2.4Ghz Rx
You put an OMM dual notch filter on 1.2-1.3Ghz video Tx to keep primary harmonic noise out of the GPS Rx, and secondary noise out of the 2.4Ghz band.
You put a LPF (typical cutoff around 600Mhz) on 433Mhz UHF control system Tx, to keep 3rd order harmonics out of 1.2-1.3Ghz video Rx.
You can put a HPF filter on 1.2-1.3Ghz Rx to block harmonics coming from 433Mhz control system,
but it's usually easier to use the LPF on the 433Mhz system (some have it integrated already).

ian
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