[amsat-bb] Re: Sats after dark
Mark L. Hammond
marklhammond at gmail.com
Fri Nov 19 07:17:57 PST 2010
You have a great memory :)
We had hoped that with some experimenting that we could configure
IO-26 into a "bent-pipe FM/SSB repeater" like we did with AO-16. Thus
far, I haven't been successful. It is likely that the hardware isn't
in place to permit this. We haven't completely abandoned the idea,
but our best guess attempts at making it work haven't work out. It
may be something we can again attempt over the holidays (between
Thanksgiving and New Years) when we are on holiday with some extra
hours in the shack!
Last weekend I turned AO-16 on; it stayed up for about 30 secs--not
long enough to be useful.
Glad you asked.
On Fri, Nov 19, 2010 at 9:34 AM, Chris Bloy <chris at photofuture.co.uk> wrote:
> 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?
> -----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,
> 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!
> 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?
>> Dominic G6NQO
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> Mark L. Hammond [N8MH]
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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Mark L. Hammond [N8MH]
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