[amsat-bb] Re: Prospero Commanded Pass Today

[g.shirville at btinternet.com]

Hi Jan,

Yes I believe the signals you are hearing (I can also hear them here most of 
the time) are from one or more of the Orbcomm satellites. According to web 
research they all (?20+) transmit  a 125msec long burst of 57.6kb data on 
137.560MHz. The signal appears to be approx 50kHz wide on my FCD.

I have also read they they each carry a plain carrier beacon on 400.100MHz 
but I have not heard these yet.

good luck

73

Graham
G3VZV

-----Original Message----- 
From: Roger Duthie
Sent: Tuesday, October 25, 2011 2:43 PM
To: pe0sat at vgnet.nl
Cc: amsat-bb at amsat.org
Subject: [amsat-bb] Re: Prospero Commanded Pass Today

I don't think there is a 148MHz transmitter, though Prospero's uplink is
148.25MHz.

Also, after looking at your page I think I should say that we think that
the Coast BBC transmission was almost certainly  an Orbcomm
transmission.  The Prospero downlink frequency was reassigned to Orbcomm.

Which sound file are you talking about?  There are what claims to be
original audio files here: http://www.dd1us.de/spacesounds%204.html (you
need to find Prospero further down the page).

- Roger

PE0SAT wrote:
> Hi Roger,
>
> I have updated http://www.pe0sat.vgnet.nl/satellite/sat-history/prospero/
> with my latest images and recordings. It is possible to get the complete
> audio file. Send me a direct email and we can arrange something.
>
> I had read that there is a 148.000 MHz transmitter on board prospero, and
> I listend to that frquentie during the pass from 15:55 UTC. Maybe it is
> interesting what is happening on that transmitter.
>
> How do things go on your site regarding PROSPERO? any news?
>
> 73 Jan PE0SAT
>
> On Mon, October 24, 2011 13:01, Roger Duthie wrote:
>
>> AMSAT community -
>>
>> The Mullard team intend to attempt commanding to Prospero during the
>>
> following pass:
>
>> (entries are: date; mag; start time; el; az; max el time; max el; az;
>>
> end time; end el; end az)
>
>> 24 Oct
>> <http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdalljnnahdmapeidbkh&satid=5580&date=40840.6673023843>
>> 7.7 16:54:17 10 SSW 17:00:54 58 WNW 17:08:40 10 N
>>
>>
>> Any listening on the downlink, and feedback on your observations, would
>>
> be most appreciated.
>
>> We may also try the later pass:
>>
>> 24 Oct
>> <http://www.heavens-above.com/Gtrack.aspx?Session=kebgfdalljnnahdmapeidbkh&satid=5580&date=40840.7412698495>
>> 9.3 18:42:56 10 W 18:47:25 17 NW 18:52:14 10 N
>>
>>
>>
>> **** TIMES ARE IN BST (ie., UTC + 1) ****
>>
>> - Roger
>>
>> PS., I hope the copy-paste from heavens-above works.
>>
>>
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