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Old 6-Oct-2017, 9:11 PM   #32
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,280
Thanks for the details.
Quote:
Antennas placed at the tear drop.
At this position UHF channel reception is fine.
Looks like the signal path is between two trees.
Quote:
VHF RF 12 gradually degraded over the last 6 months.
Tree growth?
Quote:
Could I use AM radio as a interference detector?
Yes, interference that is heard on the AM broadcast band is often strong enough to affect VHF-High TV reception. A battery operated portable can be used as a direction finder; its built-in loop antenna is directional. Tune to a clear spot at the low 550 end and then at the high 1600 end.

The last case I helped with was detected on an AM radio in a car as it drove in a road with the power line along side. The source of the interference was a battery charger affecting VHF-High. Other cases involved LED lights, and switchmode AC to DC power adapters for laptops.

Some of the sources of interference are constant; others time related.
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Last edited by rabbit73; 6-Oct-2017 at 9:20 PM.
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