[amsat-bb] antennas and radios for that which is presently on orbit (or soon will be)

Eric Fort eric.fort at gmail.com
Tue Mar 24 08:57:31 UTC 2015

This raises the question of where, when, and why are rotors and directional
gain antennas required and/or necessary.  sure,it's preferable not to be
radiating power in a direction not directed to the transponder but I'm more
so inquiring about the limiting factors here.  If I make the assumption
that I have 100W or even 1000W at the antenna feedpoint,I likely can
generate enough EIRP to reach the sat with full quieting (or is getting
enough EIRP a problem here?)  likely more of the issue is one of effective
rx sensitivity and system noise figure, along with sufficient rx antenna
gain to hear the down link.  It would be helpful for someone to demonstrate
the required up link and down link link budgets and how they apply here.
 where if at all is a setup with rotators and directional antennas required
to work current or expected sats and when can a modest station with
sufficient uplink power and excelent rx sensitivity/selectivity be expected
to get the job done?



On Mon, Mar 23, 2015 at 10:54 PM, Clint Bradford <clintbradford at mac.com>

> Modest yagis are more effective than eggbeaters ... Computer-controlled
> yagis with an elevation rotator is an "ideal" setup for many.
> You will receive some excellent suggestions from those with more elaborate
> systems than mine
> Clint K6LCS
> Sent from my iPod touch.

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