In article , "Steve Nosko"
writes:

Be careful with this. I haev an ICOM 706 which I have been listening to
350kHz beacons and I suspect sensitivity is not an issue. The receive is
not selective enough to keep out much noise. Below about 200KHz I heae
locam AM broadcase stations. Some kind of IM or something. I want to build
some kind of a low / band pass filter to see if it makes a diff. The
specific antenna can also make a diff. I'm using a 40M dipole.

Pretty sure that the best antenna is a loop -- a big one with lots of turns,
and a fat cap to resonate it to 60 KC. Maybe not practical. Or use a big
ferrod loopstick and wind LOTS of turns on it.

And like you say, many RX suffer from intermod and images from the BC stations.
A low-pass filter would probably help a lot. A resonant loop would of course
eliminate all that stuff.

I haven't cracked my Rat Shack clock open, but I suspect there's some kind of
loop antenna inside. --Mike K.

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