Quote:
Originally Posted by ADTech
The other possibility is that, since you're so close to the numerous TV and FM transmitters on San Bruno and Sutro, is that the front end of your receiver is simply getting swamped. I'd try some attenuation (10-20 dB) at the receiver input to see if you can cool things off. Such attenuation would also knock the on-channel signals from Diablo down and would remove them as a possibility.
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So I had a chance to test this idea. I didn't have any attenuation couplers so I used a DishTV diplexer. I says 900 to 2125 MHz so I figured it has more than 20db loss at FM frequencies. It knocked out a number of stations completely including one of the stations I am trying to fix, 107.7. However, I was still able to get 105.3 and it seemed to be better. Before if I had it in stereo mode it would flicker in and out of mono/stereo. Behind the Sat. Diplexer it stayed on stereo with out dropping down to mono. The static was greatly improved too, still there but much less noticeable.
One question I had regarding receiver amp overload is the first station on my FM Fool report, KCSM 91.1. I am only 1.4 miles from their towers and the Fool report says its at -9.9 dbm. Is it possible that this broadcast is overloading my receiver? I thought I read any thing under -10 dbm could cause trouble, either amp overload or harmonics.
I am also going to test a vertically polarized antenna to see if that impacts co-channel interference. See my replies to No Static At All. Thanks for you help, BTW.