[TowerTalk] TV antennas on HF towers

[Jim Brown]

On Tue, 27 Apr 2010 19:49:46 -0400, Ryan Jairam wrote:

>I operate at around 800 watts and there's no interference on my TVs.

>This is my TV antenna setup -

>2 x Channel Master 4228 (16 bay bow tie array, with a reflective screen) 
>for UHF
>Winegard YA1713 Yagi for VHF 7-13
>Antennacraft 10G212 30dB preamp

I have the same result from a similar setup -- one of those 4228 antennas 
(8 bow ties in a 4x2 array) on a 20 ft mast just outside my shack feeding 
a Zenith DTV converter to a Channel Master preamp feeding a late 90s 
vintage Panasonic analog TV. No TVI, even from 1.5kW into the 160M 
vertical, only 20 ft away! The only "filtering" is in the form of coaxial 
ferrite chokes on all the antenna cables, including the coax coming from 
the 4228. My "local" channels are all more than 40 miles away, and two 
are high-band VHF (8 and 13). Most interesting is that the VHF signals 
are the most solid (less breakup from fading) than the UHF signals, even 
though it's a UHF antenna!  

If you install anything and run into trouble, the first thing to do is 
add one or more ferrite chokes just ahead of the first RF stage tuned to 
the ham frequencies that cause interference. 

73,

Jim K9YC