[CQ-Contest] 10/15 interaction
k9yc at audiosystemsgroup.com
Thu Nov 6 12:46:44 EST 2014
On Thu,11/6/2014 7:18 AM, Randall K Martin wrote:
> I'm contemplating purchasing a high power band pass filter (4O3A) to
> prevent the interaction. I
Study my survey of the measured performance of the major brands of
bandpass filters. It ran in NCJ a year or two ago.
Since my measurements were published, 5B4AGN implemented more
sophisticated versions of his bandpass filters that provide better
adjacent-band rejection. See his yahoo group website for details, and
for how to purchase.
Also, try to learn why you're having problems -- is it possible that the
amp is creating a spur on 15M?
What kind of amp is it? Is it carefully tuned? If a solid state amp,
are you using a tuner?
If the amp is clean, you can probably do just fine with one of the
better 200W filters (or filter sets).
73, Jim K9YC
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