[BC] WLS dead cxr prob. this a.m. at ~6:50

[Robert Reymont]

I have had a number in instances where the best solution for a 
inversion layer is multiple receive antennas at different heights on 
the tower.  One instance in Sacramento where an antenna mounted on 
the roof and one mounted 150' on the tower.  You could watch the 
receive signals on the two receivers... one went up while the other 
went down.  The receivers would switch when the signal was below the 
squelch levels.  Kept the station on the air about 99% of the time.

  I also found the same problem in Orlando with a twenty mile 
hope.  Antennas mounted at 150' and 450' solved the problem.


At 09:16 AM 7/1/2006 -0700, you wrote:
>In this case, where there was an inversion layer causing the STL "beam" to
>miss the receive antenna, I wonder if another antenna at the receive site
>would have suffered the same signal loss at the same time. MANY years ago,
>the TV station in San Luis Obispo got almost all of its programming from
>its sister station in Salinas with a bunch of long microwave hops. They
>had two receivers and two receive dishes. A comparator watched the AGC
>voltage and switched to the receiver that had a better signal. This space
>diversity system worked pretty well for them. There WERE times when both
>receivers faded, but more often it was just one of them.
>
>Harold
>
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Robert Reymont
Double R Consulting, Inc.
P.O. Box 42277
Mesa, AZ 85274-2277
Phone (480) 820-2439, FAX (480) 820-2514