Topband: NCC and phased Active verticals follow up

[Rick Karlquist]

Tod -ID wrote:
> In my measurements there is still a signal at 1850 kHz at -80 dBm. That
> should not be there. It is possible that something external to the active
> whip is doing mixing of the BC frequencies and radiating the 1850 signal.
> It
> is also possible that something in the electronics of the ARAV is doing
> some
> mixing producing that rather low amplitude signal. Either way, the
> electronics of the ARAV were not producing the S9 signal I was hearing
> last
> weekend, my preamp was doing that.
>
> I wrote this note because I wanted to be sure that no one reading the
> original comments would be left with the opinion that I have found some
> defect in the ARAV2-1P unit or the NCC unit-- that is not the case. My
> problem was entirely attributable to the preamp I had in the output of the
> NCC.
>
> Tod, K0TO

When I tested the ARAV, I experienced spurs that were generated in
the electronics of the ARAV itself.  No way to fix those.  A filter
afterwards doesn't help and you can't insert one ahead of the
electronics.  I am in a fairly strong BCB environment. YMMV.

Rick N6RK