Re: Harmonic performance - SSB vs CW

Warren Allgyer

I removed the 80 meter toroids and assembled them, along with the requisite SMD 1000 pF caps on the underside, in line of perf board.  I cut the RF trace from T11 to the relays and routed it out to the new filter via teflon coax.

The 3rd harmonic of the 80 meter CW signal is marginal but would pass FCC scrutiny at -46 dBc. Higher order harmonics are obliterated.

Remember this is CW on 80 meters, far and away worst case. This filter is fine. It is a layout issue.


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