[amsat-bb] Re: TVI problem

Franklin Antonio antonio at qualcomm.com
Mon Apr 21 19:00:08 PDT 2008

At 04:14 PM 4/21/2008, w0dxz at aol.com wrote:
>I have a TVI problem that may curtail my? ham operation... I run 5 
>watts on 145.920,? FM,? to a beam 5 feet above my roof.
>my next door neighbor says I am getting into their TV,,, they have cable...

Very common problem.  You didn't give us many details, so I'm gonna 
guess this is the old channel 18 problem.

You also didn't say whether the neighbor tunes to this channel using 
the TV or a cable box or what.

Cable TV channel 18 is at 145.25 MHz.  Loose connections in the cable 
system (probably on or in your neighbor's house) are the most likely 
cause.  The technical name of this problem is "cable ingress".

Cable company near me used to have disney channel on 18, and ingress 
from ham signals caused lots of complaints.  They changed the lineup 
to put something less widely viewed on 18 to fix the problem.

Call the cable TV company and ask for help with a cable ingress 
problem.  Its their problem.

More information about the AMSAT-BB mailing list