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MHX-910 vs 2400

PostPosted: Thu Nov 29, 2007 4:17 am
by cpbridges
Hi Pumpkin,

I was wondering if you could tell me the main differences between the MHX transceivers? 910, 2400, 2420 (and other revisions).

I've looked at the data sheets and is it only the frequency that's different? Or is there additional functional/ operational differences?

Cheers, Chris

Re: MHX-910 vs 2400

PostPosted: Thu Nov 29, 2007 8:23 am
by aek
It's best to ask Microhard directly ... they have a policy of not posting user manuals on their website, but you can get one if you ask nicely.

In general terms, the x20 units are the newer units that are based on a 32-bit microcontroller. The x00 units (like the MHX2400, which is the only one I know of that has flown in space) were based on the PIC17C756, and are now obsolescent.

The x20-based units have lots of extra features -- best ask Microhard.

Also, I'm pretty sure that the x20's are completely backwards compatible with the x00's.

Incidentally, the x20 units all run a custom version of Pumpkin's Salvo RTOS in their firmware.


Re: MHX-910 vs 2400

PostPosted: Thu Nov 29, 2007 8:36 am
by cpbridges
OK thanks Andrew. I kind of knew that too.

NASA's GeneSat-1 flew the MHX-2400, which is the only one that I can find. I'm concerned about the functionality and reliability though; from their website: "The 2.4 GHz command link is functional but limited in performance".

Any comments on how well it did in space would be very welcome!

Re: MHX-910 vs 2400

PostPosted: Thu Nov 29, 2007 8:50 am
by aek
The SmallSat 2007 conference has a paper with extensive information on GeneSat's experience with the MHX2400.

SSC07 Proceeding/papers/SSC07-XI-11.pdf
"A Flight-Proven 2.4GHz ISM Band COTS Communications System for Small Satellites"
Ignacio Mas, Christopher Kitts -- Santa Clara University