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 [email protected]. Opinions expressed are those of the author.
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