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

[Mike McCarthy]

Antenna height diversity has been used by the telco's for years on their 
microwave hops. Usually 50 ft. spacing is sufficient.

At the site I'm adding the T-1, I'm also adding a 2nd antenna on another 
tower 100 ft. lower than the existing antenna for that very reason. Once 
the 2nd antenna is installed, the remote control will switch antennas and 
look at the new signal strength before deciding on whether to dial the POTS 
codec.  At this site, 0.6 Fresnel zone is less than 100 ft. AGL.  So the 
height AGL is not an issue...thankfully.

MM

At 10:33 AM 7/1/2006 -0700, Robert Reymont wrote
>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
>
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