Hi,
For a digital bird with a 10 GHz downlink, would it make sense to use DVB-S for the downlink?
If you did, I think that most specialised part of a ground station would be an appropriate LNB that will mix 10.0 to 10.5 GHz down to IF. Demodulation could then be performed with ordinary consumer grade DVB-S set top boxes and PC based DVB-S interfaces.
Out of the box, a consumer DVB-S STB (Set Top Box) can handle both audio channels and video channels. The DVB-S protocol can also multiplex data (PBBS message forwarding? APRS?) along with multiple audio and video channels on the one carrier.
The satellite could have multiple uplinks on multiple bands, eg FM voice uplink(s) on 2m, 9k6 data uplink on 70cm, and video/high speed data on shorter wavelengths. So, with say a 2m mobile rig, and a consumer DVB-S setup (with a 10 GHz LNB) you could QSO via the bird. If you want to get into data, video or digital voice, the bird would do that do.
73, ZL2WRW Ross Whenmouth
Ross,
You may be wish to watch the presentation to given by Peter Guelzow DB2OS at 11:20 BST (1020 GMT) on Sunday, July 27.
Peter will be talking about the equipment required to work the new amateur radio Geostationary 2.4 to 10 GHz payload which may be launched in 2016. Es’HailSat-2 will provide a 250 kHz linear transponder intended for conventional analogue operations in addition to another transponder which will have an 8 MHz bandwidth. The latter transponder is intended for experimental digital modulation schemes and DVB amateur television. http://amsat-uk.org/2014/03/22/geo-transponders-on-eshail-2/
Watch the Colloquium live at http://www.batc.tv/streams/amsat2014
The AMSAT-UK International Space Colloquium is being held on the weekend of July 26-27, 2014 at the Holiday Inn, Guildford, GU2 7XZ, UK. The event is open to all, admittance £10 a day.
Further details http://amsat-uk.org/colloquium/colloquium-2014/
---- Trevor M5AKA AMSAT-UK Website http://amsat-uk.org/ Facebook https://www.facebook.com/amsatuk Twitter https://twitter.com/AMSAT_UK ----
On Thursday, 24 July 2014, 10:09, Ross Whenmouth ross@topwire.co.nz wrote:
Hi,
For a digital bird with a 10 GHz downlink, would it make sense to use DVB-S for the downlink?
If you did, I think that most specialised part of a ground station would be an appropriate LNB that will mix 10.0 to 10.5 GHz down to IF. Demodulation could then be performed with ordinary consumer grade DVB-S set top boxes and PC based DVB-S interfaces.
Out of the box, a consumer DVB-S STB (Set Top Box) can handle both audio channels and video channels. The DVB-S protocol can also multiplex data (PBBS message forwarding? APRS?) along with multiple audio and video channels on the one carrier.
The satellite could have multiple uplinks on multiple bands, eg FM voice uplink(s) on 2m, 9k6 data uplink on 70cm, and video/high speed data on shorter wavelengths. So, with say a 2m mobile rig, and a consumer DVB-S setup (with a 10 GHz LNB) you could QSO via the bird. If you want to get into data, video or digital voice, the bird would do that do.
73, ZL2WRW Ross Whenmouth _______________________________________________ Sent via AMSAT-BB@amsat.org. 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
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Ross Whenmouth