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Re: Re: PICPOT Power!



Icom's PCR-1000 might serve well as a tunable IF,now if we only had some
software to decode...

Roger
WA1KAT

----- Original Message ----- 
From: "Bill Ress" <bill@hsmicrowave.com>
To: <G0MRF@aol.com>; <amsat-bb@amsat.org>
Sent: Sunday, July 23, 2006 3:16 PM
Subject: RE: [amsat-bb] Re: PICPOT Power!


> Hi David,
>
> I did notice it on a recent review of the IARU site but thought nothing of
> it since there wasn't ever anything discussed about it. The March 06
launch
> date didn't peak my curiosity since those launch dates are rarely
accurate.
>
> What surprises me is that so many satellite builders are working under the
> "radar screen" and seem to be avoiding detection. So now we will have a
2440
> MHZ signal (in our amateur band) and I would guess so few will have the
> ability to do anything about it (downconverter and demodulation issues),
at
> least in the near term.
>
> I would agree with your analysis of the solar cells and power budget. A
> simultaneous 1 watt signal at U and S seems unrealistic unless, as you
point
> out, it's activated over Italy.
>
> Douglas, KA2UPW/5, raises a good point in his post. I'm not sure what the
S
> band signal will sound like.
>
> I hope he gets an answer!
>
> Regards...Bill - N6GHz
>
> -----Original Message-----
> From: owner-AMSAT-BB@amsat.org [mailto:owner-AMSAT-BB@amsat.org]On
> Behalf Of G0MRF@aol.com
> Sent: Sunday, July 23, 2006 12:45 AM
> To: bill@hsmicrowave.com; amsat-bb@amsat.org
> Subject: [amsat-bb] Re: PICPOT Power!
>
>
> Hello Bill.
>
> Looks like we all missed that satellite although it is detailed on the
IARU
> list showing an original launch date of March 2006.
>
>
>     Supporting Organisation  Politecnico di Torino   Contact Person
> dante.delcorso@polito.it.no.spam  Headline Details: A  picosat scheduled
for
> an March
> 2006 DNEPR launch into a 700km 98 deg  inclination orbit. Intends to take
> pictures and communicate on UHF and S  band at 9k6 AX25 using "FSK and
GFSK
> modulation.The coordinated  frequenices are UHF:437,445 MHz and S Band
> 2440.00 MHz
>  Applications Date:  11/03/2005  Freq coordination completed on 28/12/2005
>
>
> It's really nice to see those hi res pictures on the site but looking at
> the
> solar cells its highly unlikely that it could produce anywhere near 1W
> output unless it runs a negative power budget and is only switched on over
> Italy.
> It looks like it has 2 cells per side with none on the axis that holds the
> camera and helix. If the cells are similar to the Tecstar ones then it's
> possible to roughly estimate the power budget.  The Tecstar cells are
> characterised with a load of 337mA and typically produce between 1.6 and
> 2.54V.  If we
> take 2.0 as a working value, then we get 1350mW per side.
> If there are 2 sides illuminated then it has 2.7W (ish) of DC input.
>
> For a 'cubesat' it looks really robust!  But I hope they've put enough
> Kapton on it. - There is a lot of exposed aluminium remaining which will
get
> very
> hot.
>
> Fingers crossed.  - Time to dust off my 'Arsene'  2450 down  converter.
>
> Regards
>
> David   G0MRF
>
>
> In a message dated 23/07/2006 00:50:11 GMT Standard Time,
> bill@hsmicrowave.com writes:
>
> It does  appear after reading the info on their web site that the U and S
> band  downlinks will be running 1 watt output. The 437.485 MHz signal goes
> to
> a  helix which would appear to have decent gain so I'm not sure if they
are
> taking about 1 watt ERP or 1 watt into the antenna.
>
> The S band  output goes to what amounts to a patch antenna, also with some
> gain. So  same question there.
>
> In any event, the satellite should offer a "large"  U and S band signal
> (albiet 9600 baud noise) to monitor.
>
> Good luck  to all on this upcoming launch. We'll have a bunch of new
signals
> to track  and monitor.
>
> Regards...Bill - N6GHz
> ----
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> ----
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----
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