[amsat-bb] Re: Funcube-1 - Ao-73

[Graham Shirville]

Hi All,

Yes in telemetry (also known as  educational) mode we have around 300mW and 
this is a much higher average RF output than when in amateur (also known as 
transponder) mode.

Total current drain is therefore greater when in educational mode. This is 
convenient because we had planned that educational mode would be more useful 
when the spacecraft is in local daylight - ie schools would be more likely 
to be open. This is the primary mission of course. Also amateurs often have 
to work during the day so would appreciate the availability of the 
transponder during the local evening passes.

We were not, before launch, 100% certain that we would have a good enough 
power budget to run the transponder during every eclipse period but, at the 
moment, this seems to be ok - we still have quite a positive power budget.

Its a bit late here and we are quite tired after three very hectic days but 
I hope the above explanation makes some sort of sense:)

best 73

Graham
G3VZV





-----Original Message----- 
From: Stefan Wagener
Sent: Saturday, November 23, 2013 11:13 PM
To: Paul Stoetzer
Cc: AMSAT BB
Subject: [amsat-bb] Re: Funcube-1 - Ao-73

Good point.

Now from what I read they are running the telemetry mode at the same time
with lower power.

More food for thought :-)


On Sat, Nov 23, 2013 at 4:56 PM, Paul Stoetzer <n8hm at arrl.net> wrote:

> Would the transponder mode potentially have lower average power
> consumption than full power telemetry mode?
>
> In full power telemetry mode, it's putting out 300 mW the whole time. In
> transponder mode, it's only putting out 30 mW + whatever it's taking to
> relay the signals it's receiving. The transmitter would only be putting 
> out
> full power when it's in use.
>
> Unless my thinking is completely wrong here...
>
> 73,
>
> Paul, N8HM
>
>
> On 11/23/2013 5:48 PM, Stefan Wagener wrote:
>
>> Great!
>>
>> Congratulations. I guess we have to wait until the sat is in the "dark" 
>> to
>> use it here in NA.
>>
>> Just wondering why you would activate the transponder without having 
>> power
>> through the solar panels and consequently discharging the batteries
>> (unless
>> that's the intent). Maybe I am missing something....
>>
>>
>> On Sat, Nov 23, 2013 at 4:34 PM, Andre' v Deventer <
>> vandeventeraj at telkomsa.net> wrote:
>>
>>  Just had my 1st 2way SSB qso via Ao-73 with Keith ZS6TW.
>>> Strong s7-9 without p/amp and excellent SSB audio.
>>>
>>> Congrats to the team !
>>>
>>> 73 - andre ZS2BK
>>> _______________________________________________
>>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>>> Not an AMSAT-NA member? Join now to support the amateur satellite
>>> program!
>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>>>
>>>  _______________________________________________
>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite 
>> program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>>
>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
_______________________________________________
Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb