[RFI] Recent RFI status - Direct TV and Dish?

Jim Brown jim at audiosystemsgroup.com
Mon Aug 26 15:23:41 EDT 2013


On 8/26/2013 11:33 AM, Tim Duffy wrote:
> Also, how about RFI problems associated with nearby transmitting antennas
> that might cause RFI overload problems to the Dish or Direct TV systems - as in TVI?

I would expect any issues to be the result of 1) noisy switching power 
supplies,  2) noise from the downlink electronics, and 3) common mode 
coupling on the coax  (both TX and RX). and I would expect them to be 
easily solved by winding turns around ferrite cores.  I had DirecTV in 
Chicago, and never had any issues, with antennas and DirecTV downlead in 
close proximity (5-25 ft). I don't remember if I did anything with chokes.

73, Jim K9YC


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