Re: [Amps] Alpha 76 160 meter 2nd harmonic

[Jim Brown <jim@audiosystemsgroup.com>]

On Sun,1/29/2017 7:32 AM, Steve London wrote:
> I was surprised to receive e-mail that the 2nd harmonic of my 1866.5 
> signal was QRMing a QSO on 3733.
Without digging into the amp, a stub, optimally placed, would be an easy 
solution. A single stub optimally placed along the line is good for 
about 30 dB, double stubs for about 60 dB, or you could stagger the 
tuning of the stubs to broadband the suppression. Optimally placed would 
be at an voltage max along the line.
73, Jim K9YC

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