Posted by RayP(MI) on December 03, 2008 at 15:11:50 from (207.241.137.116):
A ham operator friend contacted the ARRL (Amateur Radio Relay League) regarding the new digital TV. His question had to do with interference to the new broadcasting mode by ham radio equipment. The following is their response. First time I have been able to get a handle on frequencies. Apparently they are not all being moved into the UHF spectrum. This means you will still be using conventional broad band antennas like we are now using. Don't know why the media has been so closed mouthed about this. Maybe they're too dumb to know the information, and too lazy to go looking for it. Or don't think it is important!
From the ARRL:
"The new digital TV channels are still 6 MHz wide. Furthermore, the frequency allocations from Channel 2 to 51 will also remain the same. The frequency spectrum from Channel 52 and up will be reallocated for other uses.
With DTV, it tends to be an all or nothing scenario. This means that interference will not be noticeable up to a certain threshold. Beyond the threshold, the interference will prevent reception of the entire signal.
With regard to testing, most cases of interference to television from the Amateur Radio Service are primarily caused by fundamental overload. In this situation, the TV receiver improperly responds to a strong signal outside its intended band pass. The interference from an HF station can be cured in most cases using common mode chokes and a brute force ac line filter. This should be equally true with DTV. "
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