[BC] Re: Commercial Station Feeding A Translator

[Glen Kippel]

On 10/18/07, RADIO DOCTOR 
<<mailto:lylehenry at fastmail.fm>lylehenry at fastmail.fm> wrote:
My understanding has always been that combined antennas
function as one antenna.  Two stacked and combined yagis would extract
energy from the same frontal area as would a larger one in the middle
with twice the gain.  There would be no space diversity effect.
Indeed, a lower gain antenna might be better than a high gain one if a
broad vertical lobe were desired and gain was not paramount.


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I had never heard the term "echelon antenna" before, but had known 
about stagger-stacked arrays.  Sometimes another pair would be 
arrayed next to the first.  Before there were any TV stations in 
Colorado, lots of people would put up big towers and antenna arrays 
to be able to watch TV out of Omaha.  That's a pretty long haul.

Space-diversity could be possible using two antennas (or arrays), 
each feeding separate tuners, and tying the AGC lines together.  The 
tuner having the strongest signal would generate more AGC voltage and 
decrease the gain on both tuners, including the one receiving the 
least signal.