[Elecraft] Broadcast Break though on 160m

[Brendan Minish]

Hi Bob
Good suggestions but the problem is that the unwanted signals don't appear
to be actually coming in to the K2 via the RX antenna socket at all. It's
simply that they are audible when it is selected. I hear them even with no
RX antenna connected (& i can even hear them very weakly when the RX ant
is selected and I have no antenna connected whatsoever. the power, Key and
speaker leads  (presumably in conjunction with all my other shack wiring )
are enough of an antenna to just be able to detect the break though.

They are not MW ('AM') broadcast stations but are I think from one of the
HF broadcast bands. The nearest MW transmitter to me is well over 100
miles away. Yet Evening time Skywave HF Broadcast band signals can reach
as high as -8 dBm on the 7.1 MHz, 9.5 & 12 MHz broadcast bands on my log
Yagi.


Bob Tellefsen said:
> Hello Brendan
> I don't have BC breakthrough here, but I do have a number of BC
> transmitters
> nearby, here on the edge of San Francisco Bay.
> I build my own preamplifiers with bandpass filters for 160m.  I use them
with
> my full size Flag receiving loop.  They would also be appropriate for
the K9AY loop.
> You might put together a simple two stage bandpass filter and try that
in the receive feedline to see if it gets rid of the BC signals.
>
> One other thought.  If you have a signal generator, you might try slowly
sweeping it across 160m to see if it beats with those signals.  It might
help determine what frequencies they are really on.
> Good luck and 73
> Bob N6WG
>
>


--
Brendan EI6IZ



-- 
Brendan Minish