[GreenKeys] Diversity

[Ralph Mowery]

I spent a lot of time copying the pix on 20 meters.  I only had a dipole up 
about 20 feet so the signals were not all that good.  I could see the mark 
and space fade in  and out on the scope even on the 170 hz shift. Often one 
would fade in and out and then the other one would.


----- Original Message ----- 
From: "Jeffrey D Angus" <jdangus at att.net>
To: <greenkeys at mailman.qth.net>
Sent: Wednesday, January 01, 2014 10:59 PM
Subject: [GreenKeys] Diversity


> When I first got started with RTTY, the shift was 850 Hz.
>
> Of course EVERYONE had a CRT hooked up to use for tuning.
> And you could watch a very weird phenomenon.  The mark
> and space tones would alternately increase and decrease.
> For example, the mark amplitude would remain constant,
> but you could see the space tone drop down into the noise
> and come back. Or vice versa.
>
> With the "new" 170 shift, you could still watch the signal
> fade out and come back, but the differences in amplitude
> between the mark and space tones would remain fairly
> close.


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