[Elecraft] OT Antenna location concern

[Vic, K2VCO]

I had intermittent problems with HF RF at the 100 to 1500 watt level on 
various bands to my rooftop air conditioner unit. Antennas were a beam 
about 30 feet above it and a vertical 20 feet away at roughly the same 
height. I wrapped several turns of the cable to the thermostat around a 
ferrite toroid which improved the situation but didn't totally fix it.
My unit had a 1960's technology circuit board in it, and I suppose newer 
ones have microprocessors.
Ultimately the problem went away when I moved to a different country and 
didn't take the a/c unit :-) , but I suppose it could have been fixed 
with a better toroid and also perhaps a line filter.
I would always expect problems with electronic controls close to an 
antenna, even with lower power.

On 8/14/14 11:20 PM, W2BLC wrote:
> Has anyone had difficulties with the control systems of their HVAC
> systems caused by RF from a nearby transmitting antenna? I run the
> KPA500 all the time - so consider this a 600 Watt station.

-- 
Vic, K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/