[RTTY] Need to lawyer up for 60 meters

[Don Hill AA5AU]

This may have occurred in one of the 23 Hz RTTY contests that happened several years ago.

I remember participating but don't remember the details.

73, Don AA5AU

-----Original Message-----
From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of Kok Chen
Sent: Monday, November 25, 2013 10:14 PM
To: Bill Turner
Cc: RTTY Reflector
Subject: Re: [RTTY] Need to lawyer up for 60 meters

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

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