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echo: ham_tech
to: ROY WITT
from: CRAIG SUTTON
date: 1997-01-25 00:48:00
subject: passive rebroadcast

 RW> appear to be blank signs to reflect (and redirect) their signals.
 RW> Totally passive, meaning no power requirement at all. A smaller size
 RW> reflector could possibly be "aimed" to get what you want.
 RW> Sometimes that's not even required...I lived in a valley surrounded by
 RW> high hills and 2800ft mountains...by pointing my "suburban" antenna 
toward
 RW> the west at that 2800ft mountain, I recieved tv signals originating from
 RW> the southeast..
I am surrounded by mountains as well, the only signal can be received on top 
of the mountain :(
 RW> Pointing the antenna at the tv signal got the station, but with two or
 RW> three ghost signals, which lead me to a search for one of those ghost
 RW> signals..
well i guess a ghosty signal could be better than none at all.
 RW> I often thought of placing an antenna on a nearby hill and doing just 
what
 RW> Craig has asked...I don't think his passive idea would work as well as a
 RW> transverter.
Well i got the idea from an Australian magazine, the article said that due to 
the extreme signal loss its only good for short distances. 
Have to work out how to connect the two aerials though. At this stage i
think the masthead amp is connected as usual, the downlead going into the
power unit by the set and the lead which comes out and plugs into the
antenna socket at the tv set should run straight to the balun of the other
aerial?? so the amplified signal isn't being fed to the set its going
straight into the broadcast aerial??
Now the tricky challenging bit for the maths experts out there. Say at the 
top of the mountain the signals very good on each of the 4 vhf channels the 
TV aerial is designed to recieve (lets say they are equal strength for the 
sake of things). Signal is fed to masthead amplifier (34db gain) and output 
to aerial thats identical to the receive aerial for rebroadcast. Anyone know 
what sort of power the rebroadcast aerial would put out?
I know it depends on the aerials so lets say the aerials give 8db of gain on 
each of the channels its designed for.
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