[amsat-bb] Re: [Prospero]

[PE0SAT]

Thanks Graham,

I have to my knowledge, been searching the entire Internet looking for
information about Prospero, and have no idea what else I can try. The
audio file of the German radio amateur do not help me much further and
therefore have no idea what to expect when Prospero finally transmits
something.

I tryed all kinds of modulations and scanned the band - and + 500 KHz with
137.560 MHz as center freq.

In AM I receive what seems the 57k6 transmittions from ORBCOMM.


I hope the Team that is trying to re-contact prospero have more luck.


Lets all keep in contact and share our findings.


73 Jan PE0SAT

http://www.pe0sat.vgnet.nl/


On Tue, October 25, 2011 21:59, g.shirville at btinternet.com wrote:
> Hi Jan,
>
> FWIW - my reading of the slightly old fashioned English text, is that the
> command transmitter is on a frequency around 148MHz, that it uses "two
> tones" and that the on board receiver and decoder is capable of
> understanding 35 commands. As it happens, the ground segment for the
> Orbcomm
> constellation also uses similar frequencies and "tones", so maybe you
> actually heard a ground based device nearby to you, doing its uplinking?
>
> 73
>
> Graham
> G3VZV
>
> -----Original Message-----
> From: PE0SAT
> Sent: Tuesday, October 25, 2011 3:31 PM
> To: rjad at mssl.ucl.ac.uk
> Cc: amsat-bb at amsat.org
> Subject: [amsat-bb] Re: [Prospero Commanded Pass Today]
>
>
>
> Hi Roger,
>
> The information about a second freq. came from the following document:
>
> http://www.pe0sat.vgnet.nl/downloads/Prospero-Satellite.pdf written by
> H.J.H. Sketch.
>
> Have a look at part 3.1
>
> Here a part of that paragraph
>
> "The v.h.f. system is conventional using twin transmitters, each with an
> output of 350mW at approximately 136 MHz, and a twin tone digital command
> system operating at about 148 MHz which handles the 35 separate commands"
>
> Second graph I placed last night looks like a twin tone, and is received
> around 148.010 MHz.
>
>
> With regards,
>
> Jan - PE0SAT
>
>
> On Tue, October 25, 2011 15:43, Roger Duthie wrote:
>> 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.
>>>>