[amsat-bb] Re: [Prospero Commanded Pass Today]

[PE0SAT]

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.
>>>
>>>
>>> _______________________________________________
>>> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the
>>> author.
>>>
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>>
>>
>>
>
>
>


-- 
With regards PE0SAT
Internet web-page http://www.ham.vgnet.nl/