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, [email protected] 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: [email protected] > Cc: [email protected] > 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. >>>> _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
