[RTTY] Need to lawyer up for 60 meters

[Kok Chen]

On Nov 25, 2013, at 7:02 PM, Bill Turner wrote:

> Never heard of MSK before.

Minimum Shift Keying.

45.45 baud MSK looks sufficiently enough like a waveshaped FSK signal with 22.725 Hz shift to be interoperable between them.

http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Frequency-shift_keying.html

You and I made a QSO using 22.725 Hz shift a couple of years ago, for precisely the the same reason -- to test narrow shifts -- right after the 60m band was opened up for RTTY.  But we'd made the QSO on 20m.

From the error rate viewpoint, if you are going to use such a narrow shift, it is better to use true coherent MSK modulators and demodulator, with raised cosine filters.

73
Chen, W7AY