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Categories | Filters, Audio: (DSP and others) | Wouxun Audio Filter Help

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N4LQ  Rating: 5/5 Mar 28, 2014 18:34  Send this review to a friend!
Excellent after modifications  Time owned: 0 to 3 months
This is a SCAF type filter. They are excellent for CW since they do not tend to ring. This filter is no exception however like ALL SCAF filters, it is very sensitive to RFI from the transmitter.In fact this filter was totally unusable even with a QRP rig due to RF feeding back into the filter.
So I remove the covers and was shocked to see that the aluminum cover was not in any way attached to the ground on the circuit board. I was able to attach a very fine wire at each end of the ground trace and attache the other end under the control nut and under a screw head. I then installed bypass capacitors across all three jacks, power, input and output.
Results were excellent. Even with the amplifier I have no unwanted crud from the filter and cw has never sounded better using my headphones or my beloved MFJ-281 speaker which BTW is the ultimate cw speaker at any price. 
Product is in production.
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