[amsat-bb] Re: BeeSat at 4800 GMSK

Tom Azlin N4ZPT n4zpt at cox.net
Thu Apr 8 15:28:15 PDT 2010

Hi Nate,

I was not aware MixW had MSK in it but still identical to GMSK. Perhaps 
you are thinking of MFSK? In the MixW program there is MSFK16, a 
multitone frequency shift signal, is supported, but not Minimum Shift 
Keying or Gaussian Minimum Shift Keying signals. And also FSK, aka RTTY.

There is work going on to make a sound card 4800 bps 0.5 time-bandwidth 
product GMSK soundcard modems for use in GMSK DV adapters to use with 
D-STAR radios. Perhaps that could be adapted for your purpose?

http://www.qsl.net/kb9mwr/projects/voip/dstar/G4KLX.html seems to 
describe some of the work.

http://groups.yahoo.com/group/dstar_development/ and 
ttp://groups.yahoo.com/group/pcrepeatercontroller/ are where I see the 
discussion underway.

Separate discussion is using an external sound card interface like the 
Rigblaster, to connect a computer and radio.

73, Tom n4zpt

Nathaniel S. Parsons wrote:
> Can I assume MSK=GMSK? I thought they were different, but they are the same,
> and since MixW has MSK, and I could use that with a Rigblaster, etc, right?
> -Nate

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