[amsat-bb] Re: Redundant geostaionary birds?
karl at bullock.org
Tue Jan 30 10:14:58 PST 2007
Thanks, Dave. Nothing ventured, nothing gained, eh?
Dave hartzell wrote:
> Hi Ed,
> You're right, the thread is going nowhere, other than to satisfy some
> intellectual curiosity. That was established early on in the thread.
> Why not explore potential systems and alternatives, even if they are a dead-end?
> Thanks for contributing! ;-)
> On 1/30/07, Edward R. Cole <al7eb at acsalaska.net> wrote:
>> Dave and all:
>> I wonder what all of you were thinking? If a commercial communication
>> satellite were channeled on one of our mw ham bands, then we would be
>> booted off.
>> C-band satellites used approx. 37-MHz wide channels with alternating linear
>> polarity to afford more adjacent channel isolation. On most of the TVRO
>> units one could manually adjust polarization angle for optimizing the
>> signal. If you adjusted 90-degrees off then one often got a ghost of one
>> of the adjacent channels. The feedhorns had a rotating probe with the
>> motor on the backside of the feedhorn.
>> Typically in the mid-1980's these TV sats cost over $100M before launch.
>> Your not going to convince the satellite company to include ham radio in
>> any manner.
>> AS has been hashed out many times previous on this reflector the path loss
>> to the Clarke Belt orbit is prohibitive.
>> This topic is going no-where!
>> 73, Ed - KL7UW
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