[amsat-bb] Re: [sarex] Direct reception of TV signals from ISS and Shuttle

["Murray Peterson VK2KGM" <vk2kgm@xxxxxxxxxxx>]

Hi Dan and the rest of the group,
                                                        I already have an
S-band low noise amplifier & down-converter unit  and 24db gain grid dish
antenna I use for ATV in the 2400 MHz - 2450 MHz band. It has a LO at 1450
MHz so that makes 2400 MHz - 2450 MHz come down to 950 MHz - 1000 MHz to
suit a standard satellite receiver (Analog or digital).

    I have also received good pictures from a news & traffic watch
helicopter (analog FMTV) on 2561MHz at about 70 Km range - so I know the
system works OK. My first question is what is the modulation used by the
shuttle? - eg is it 64QAM MPEG2?  The second question is what frequency is
it on?

regards,
Murray

----- Original Message -----
From: "D. M. Kirby, USAF/MARS" <afa3dk@alltel.net>
To: "Murray Peterson VK2KGM" <vk2kgm@ihug.com.au>
Sent: Thursday, October 10, 2002 1:57 PM
Subject: Re: [sarex] Direct reception of TV signals from ISS and Shuttle


| Murray,
|
| I don't know about any software or handshaking being required.
|
| And I don't know where you would get a s-band TV receiver you would
probably
| have to convert the s-band signal down to 425 to 430 MHz or a standard tv
| frequency.
|
| you might try a web search abd see if you can come up with something.
|
| Sorry I can't help you further.
|
| 73, Dan K5AIR
|
|
| At 12:00 10/10/02 +1000, you wrote:
| >Hi Dan,
| >                Thanks for your reply.
| >
| >    I didn't expect the signal to be analog. Is propriety software and
| >"handshaking" required then to receive the pictures?
| >
| >    RocketCam (as used on the latest shuttle launch) on the otherhand
uses
| >"standard digital TV" encoding requiring no specalist equipment to
receive
| >the signals acording to their brochures. I assume an "off the shelf"
digital
| >satellite TV receiver correctly programed is all that is necessary if you
| >already have the antenna and S-Band "LNB".
| >
| >regards,
| >Murray
| >VK2KGM
| >
| >----- Original Message -----
| >From: "D. M. Kirby, USAF/MARS" <afa3dk@alltel.net>
| >To: "Murray Peterson VK2KGM" <vk2kgm@ihug.com.au>
| >Sent: Thursday, October 10, 2002 11:29 AM
| >Subject: Re: [sarex] Direct reception of TV signals from ISS and Shuttle
| >
| >
| >| Voice and Television signals from the shuttle and ISS are digitized
| >| and relayed to ground thru the TDRS satellites.  They cannot be
received
| >| on a standard analog type receiver.
| >|
| >| 73, Dan K5AIR

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