| Post 9 made on Tuesday January 9, 2018 at 01:56 |
Ernie Gilman Yes, That Ernie! |
Joined:
Posts: | December 2001
30,104 |
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buzz,
I used that exact technique in an odd FM situation. There's a high-powered FM transmitter at 98.7 along Mulholland Drive between LA and the Valley. There's a low-powered jazz station at 88.1 about thirty miles south and up over a hill that was close to the client.
Well, she wanted to hear jazz! She had some odd interference, which some listening showed was the station at 98.7.
How the hell was that station interfering? 98.7 is 10.6 MHz from 88.1. The IF frequency of the usual FM tuner is 10.7 MHz. The 98.7 station was WAY more powerful than the 88.1 station, so powerful that some of it was leaking through the IF section.
Once I realized that, I turned the directional FM antenna that I had installed for her so that the 98.7 station was nulled out. The interference disappeared.
Null response is WAY further down, and so much more aimable, than peaks.
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