>Tim H. Ahrens wrote:
>> In the receive mode, I'm hearing a constant
>> hetrodyne. I first thought it was some type of
>> foreign broadcast, but it's still there without
>> an antenna! duhh! The 38s receiver seems to be
>> hearing the 12mHz oscillator, because the freq
>> of the hetrodyne changes if I touch stuff around
>> it. BTW, it's not really loud, just enough to
>> bug you,,, kinda like a mosquito!
Tim -
Do you have your 38 Special cased in a grounded metal box ??
The reason for asking is that I had a foreign broadcast problem with my
SW-160 from Dave Benson. Dave chose an IF for 160 meters that was within
about 5 Khz of a strong BC station in Florida. Just about sundown everyday
I'd start hearing this station everywhere on my radio dial - with or without
antenna. The station was getting into the IF directly - I put the circuit
board into a steel tin and the interference vanished. It doesn't have to be
a perfect shield - I just put it into a coffee can at first without a metal
lid just to see the effect and it took care of the problem.
Another fellow with the same radio didn't notice the BC station at all - it
really depends on location and signal strength.
Best Regards,
Chuck
Chuck Olson
WB9KZY
Jackson Harobr Press
Washington Island, WI
[
QRP-L Archive |
]
[
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000
]