Guy Olinger K2AV wrote:
> A BC notch filter that works on 160 has two issues, first that it has to
> notch out an interfering station, and second, that at each 160 frequency to
> be measured, the residual reactance of the notch must be tuned out, one
> frequency at a time. The MFJ design will do this, but if one is being
> bothered by more than one station, a single notch will not work.
>
> I guess I am lucky. I have a 5kw day and 1 KW night about 3.5 miles from
> me. To verify the 160 meter measurements on the tower I just dial up the
> transmitter remote contol and reduce the power for a few minutes.(Its doing
> maintenence anyway.) I also have to reduce power of several local FM
> stations when cell companys and internet providers climb towers to do
> replacements. So know the station engineer might be worth more than trying
> to build a filter. He might also lend you his Delta OIB in line impedance
> bridge.One thing I found out about my MFJ is that it makes a great weak
> signal source for testing antennas. I use it for F/B checks on two wire
> Beverages rather than drilling down to the BC band.
> It drifts a bit but you get the drift. right?
>
Herb Schoenbohm, KV4FZ
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