[BC] Re: Alternative reality
r j carpenter
rcarpen1 at verizon.net
Sun Oct 7 01:02:19 CDT 2007
Doesn't Congress expect to balance the Federal budget by selling
channels 2-6 to other services in most of the US? If so, setting even
part of them aside for an AM-replacement is a non-starter.
I think that sporadic E long-distance interference at channel 2 would
make the occasional tropo QRM on 88-108 look trivial. I've told the
story before, but remember when Collins ran 49.8 MHz from Cedar Rapids
for the NBS ionoscatter tests. Collins had a 20kW xmtr and NBS received
on a 600-foot rhombic antenna near where Dulles Airport is now located
near Washington. On one good Es day, a small pilot lamp (2V 60mA??) was
connected to the receive antenna and it was visibly lit by the incoming
signal!! I don't know the Collins ERP. Rhombics don't have a lot of
gain for their size. NBS chose the rhombic because it was cheap, quick
and they had the space.
bob carpenter
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