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Date: Sat, 21 Jul 2007 16:01:24 +0200
Subject: Re: Re: LF: 500 RTTY first 2 way
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Status: O

Hello Andy,

as John wrote:

> MSK is available in Spectrum Lab, and we have used it a little over here=
=20
> on 137. Wolf's implementation is based on the PSK31 varicode. The mode=20
> does work, but seems to be a bit "deaf" compared to PSK. As I recall=20
> (it's been a while), Wolf indicated that the decoder could stand some=20
> improvement.
>=20

Confirm, and not much to add here. The decoder works to some extent, but de=
finitely needs improvement.
I gave up on improving it at that time, since there seemed to be little int=
erest in it.
If I remember correctly, there was some successful  2-way MSK contacts with=
in DL, and a few SWL reports, but that's about it.

I never got the Massey-Hodgart decoder running properly (it always got stuc=
k in some state), so we just used the simple incoherent detector with a mat=
ched filter.  I still have the C / C++ sources here, so anyone is invited t=
o improve it ;-)

Cheers,=20
  Wolf  DL4YHF .

P.S: Thanks for the LF QSO Jim, pushing the score to four CW QSOs on one af=
ternoon (PA0SE, DL2HRE, G3YXM, M0BMU).=20
Now closing on LF due to increased QRN .=0A=0A=0A=0A=0A=0A=0A=0A=0A=0A=0A=
=0A