[Elecraft] Broadcast Break though on 160m

[Brendan EI6IZ]

I have just constructed a K9AY loop system to use a receiving antenna on
160m and since I am now using the RX antenna socket I am noticing a
problem that I haven't seen before with my K2

When I have the RX antenna selected (even with no antenna connected) i
have break though from broadcast stations on 160m. these are not as far as
I can tell local AM stations but are from HF. I can't discover any obvious
(to me anyway) harmonic relationship except that they are inverted (tuning
up in frequency appears to actually tune down the BC band stations

this occurs even with no RX antenna when the RX antenna socket is selected
and the stations are there weakly even with no antennas whatsoever
connected to the K2 (presumably the DC, speaker and key wiring is enough
to pick up quite a signal on hf in Europe)

I can find no  obvious cause except that selecting the RX antenna allows
some stuff to slip past the low pass filters ?

I only see this on 160m as far as I can tell.

73
Brendan EI6IZ


--
Brendan Minish

-- 
Brendan EI6IZ <ei6iz at oceanfree.net>