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Old 1st Aug 2006, 8:13 am   #7
YC-156
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Join Date: May 2005
Location: Aarhus, Denmark
Posts: 281
Default Re: Fighting VHF interference with a DIY balun.

Quote:
Originally Posted by Superhet Si
Maybe a passive bandpass filter or trap could be fitted to the aerial input?
This will not make any difference I'm afraid. The interfering signals are legal, on frequency and on the air. The balun helps sort out signals from two distinct physical sources, both on the same frequency.

Quote:
Originally Posted by Superhet Si
Is the set earthed?
No. It is fairly hard to make a proper ground connection at VHF. A tuned quarterwave radial might help a bit with signals picked up directly by the chassis. It migth also make the problem worse, and so far I haven't been annoyed to a point, where I feel like experimenting with VHF ground currents.


Quote:
Originally Posted by Superhet Si
It could be the signals are being picked up by the chassis as your in line of sight?
As mentioned above then I did test for this, and a few of them are. Not the majority, though, which is where the balun helps.

Frank N.
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