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Re: AO-51 or ECHO downlink power



Gentlemen,

I am working on assembling some comprehensive answers to these questions. 
Give me a few days and I'll get it together in one email to the -bb.

73, Drew KO4MA
AMSAT LM 2332
AO-51 Operations Committee

----- Original Message ----- 
From: "Robert Bruninga" <bruninga@usna.edu>
To: <amsat-bb@amsat.org>; <tmcgrane@suffolk.lib.ny.us>
Sent: Thursday, July 20, 2006 2:37 PM
Subject: Re: [amsat-bb] AO-51 or ECHO downlink power


>>>> McGrane <tmcgrane@suffolk.lib.ny.us> 07/20/06 12:24 PM >>>
>>I have a few points regarding the low power downlink of ECHO.......
>>A year and a half ago, I proposed...changeing the satellite
>>control to allow excess solar power, beyong battery charging,
>>to be directed to the transmitters for higher power daylight operation.
>
> I wonder also if the transmitters are on all the time including the 90% of
> the time they are not over the 10% of the earth with Ham radio
> operators?  I don't know, because when I listen (in the usa) of course
> they are always on.  I dont know what they do the other 95% of the
> time.  Since there is PL on the uplink, it would seem possible to
> have that start a 1 minute time out timer that would key up the TX
> while in view of users, and then time out 1 minute after last user?
>
> This would allow a 10dB increase in TX power with no impact on
> average power budget.
>
>>I believe one of the intents of echo was to introduce new users to
>>satellites and amsat.
>
> Being 10 dB stronger when in view, and Off when no one is in the
> footprint  would make it a lot more visible to modest users.
> Again, I could be fully wrong and maybe it does only come up on
> PL 67.  But I could not find any mode-descriptions on the web
> page that gave this kind of detail.  So forgive me for guessing...
> or for not finding the right info...
>
> Bob
> ----
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