Re: a simple spur fix

Jerry Gaffke

Farhan reports that his coil and cap have a null 10dB better than needed to meet regs, no need for higher Q.
If the 90mhz trap can be done with a surface mount coil and cap on the back of the board, that's a very easy fix.

On Sat, Nov 10, 2018 at 09:16 AM, iz oos wrote:

I have no doubt Farhan solution might work but I guess that the Q of the 90Mhz and the null could be higher using a quarter wave open coax stub cut for the 90Mhz (likely a cap between 20 and 30pf in parallel would be needed).


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