[amsat-bb] Re: Sats after dark

[Chris Bloy]

Hi Mark,

I remember a while ago you mentioned that it may be possible to reconfigure
IO-26 to be used like LO-16? Was I seeing things or was this a true and has
any progress been made on this?

Thanks,
Chris

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Mark L. Hammond
Sent: 19 November 2010 13:55
To: Dominic Hawken
Cc: amsat-bb at amsat.org
Subject: [amsat-bb] Re: Sats after dark

Hi Dominic,

It's a great question!

If the satellite has batteries that can keep the communications payload ON,
the satellite can continue to support communications during an eclipse (what
we call the time spent in darkness).

Some satellites do not have batteries, so they will support communications
only when in the sun (DO-64 for example).

IO-26  has batteries that are pretty old--yet it continues to operate
through pretty long (20 mins or more) of eclipse each orbit.  So yes, there
are examples where the transmitters work through eclipse (IO-26, VO-52,
etc.).

For AO-51, it's all about power management--both by the bird and by the
command stations.  Right now, AO-51 sees sun all the time. Around
January 1, it will begin to experience ecslipses again.   Its
batteries have lost much of their capacity,  and we expect that there will
be enough power to keep the computer alive during eclipses, but the
transmitters will need to be shut OFF.  The computer and software onboard
AO-51 help do that automatically (for the most part).

Hope that helps!

73,

Mark N8MH

On Fri, Nov 19, 2010 at 8:29 AM, Dominic Hawken <dominic at del.co.uk> wrote:
> Probably a dumb question and still new to this - apologies in advance.
> Am I right in thinking the amateur sats switch comms off when not in 
> sight of the sun? Are there any that continue to run in darkness?
>
> Best,
>
> Dominic G6NQO
>
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--
Mark L. Hammond [N8MH]
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