[Elecraft] RFI issues

[Gmail - George]

Andreas,
You might want to go to the station and talk the the Chief Engineer. If he 
is the nice-guygal type CE he will help you (Not al CEs are the nice kind 
but most are).

I'd suggest that he/she cycle the two transmitters on/off while you are at 
your station. He/She won't do that during the early news but might at 2 or 3 
AM. It is worth a try.


Long ago - I had the opposite issue when ham transmitters interfered with TV 
receivers. Some people call the TV station to resolve the issue. Most of the 
time it came down to who was going to buy the filter. At any given time we 
probably had 10 filters on the shelf.

One point - TV (especially UHF) antennas tend to fairly high gain. The 
pattern tends to be omnidirectional horizontally. The gain is in the 
vertical plane. Much of the transmitted power is well above 10° (probably 
much higher). The FM antenna gain depends on the size transmitter. Usually 
they tend to use lower gain than TV antennas.

In a spectrum analyzer - the digital TV looks like high power noise. The 
signal should square corners on both ends of the occupied spectrum.

73
George  AI4VZ



-----Original Message----- 
From: Andreas Wachter via Elecraft
I live about 1.6 miles from some tall antenna towers broadcasting digital TV 
(KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 
kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I 
moved to this QTH a few months ago, I am unable to use my K3: solid S9+ 
noise on all bands using a makeshift dipole strung up on some trees outside 
my house. I’ve tried to locate the source of the RFI within my home but so 
far have been unable to locate any RFI emanating from within my home. Could 
it be that the TV/FM stations antenna towers, which are within direct line 
of sight from my house, might be responsible for the RFI?

73, Andreas

K6AKW