From: Greg. (greger_at_rfelektronik.se)
Date: Mon Mar 03 2008 - 15:11:32 PST
If you are no-top-reply freak - don't look below the line!
I asked as more people have receivers in the L/S bands but not X,
of course there's the way to mix a signal - but I'm talking about
direct signal reception.
On the matter of mixers by the way, the ones I've tried distorts
the sinus and I'm afraid I get alot of birdies and other nonsense.
I don't know if other people have seen this - not everyone have
equipment to send/receive the signal directly at 1.5-2.5 ghz...
What should I expect with mixers?
Thanks for the group, most interesting.
//Greg
JO89sn
___________________________________________________
> Greg,
>
> Good points. There already is a Yahoo Group that builds tracking
> stations to monitor space probes. It is called the DSN Group after
> the NASA acronym for the Deep Space Network of ground stations that
> do the NASA tracking.
> http://groups.yahoo.com/group/amateur-DSN/
>
> Several members of this international group have been receiving
> signals from the Mars orbiters on the nominal 8.415 GHz microwave
> band that is now the standard for spacecraft comms beyond Earth orbit.
> http://groups.yahoo.com/group/amateur-DSN/database
>
> You do have to register with the Yahoo group to view this.
>
> I believe that stations using as small as a 2m dish have successfully
> detected some of the orbiters. The receiver commonly is a LNA +
> mixer fed by a brick LO and followed by a VHF or UHF SSB
> receiver. Weak signal detection is done using soundcard programs
> such as Spectran.
>
> Any Argus station should be capable of reception with the proper
> frequency feed and receiver. I believe that recent probes to the
> Moon were operating on about 2280 MHz.
>
> 73 Ed - KL7UW
> ARGUS Station BP40IQ
>
> At 08:35 AM 3/3/2008, Greger Gimseus wrote:
>>Currently there are 3 probes around Mars,
>>
>>1) Mars Odyssey, 2) Mars Reconnaissance Orbiter (MRO) 3) Europe's Mars Express
>>
>>They are all going to watch as Phoenix Mars Lander lands on May 25'th.
>>
>>With 3-4 probes in working order around the planet - I think atleast some
>>of us could be able to recieve any signals.... I bet they don't
>>transmit around 1.42GHz... but surely someone may have
>>2.1-2.2GHz reception capabilites? It's probably around there you can find
>>most signals, except for 8-10GHz and above.....
>>
>>What possabilities would there be to recieve a 5W L-band / lower S-band
>>signal, using <1dB LNA what dish size and integration time would be
>>required for this?
>>
>>Perhaps they use even more powerful transmitters than 5W?
>>It's just a figure I read somewhere....
>>
>>JO89sn
>>//Greg.
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