Re: [RTTY] E-mail from VU4 Dxped re PSK31 for NA

[Kok Chen <chen@mac.com>]

On Dec 17, 2004, at 5:08 AM, Richard W. Solomon wrote:
> And don't tell me PSK is better for weak signals, it may be, but SSTV 
> ??

For weak signal work, when there is no multipath, PSK is not maybe 
better than FSK, it most certainly is. Both theoretically (in terms of 
BERR versus SNR calculations) and also from what I can tell by 
experimenting with constructing demodulators for them, and working with 
both modes on the air.

Moreover, from the DX end's perspective, a single visual panoramic 
sweep using a 2.4 kHz SSB filter gives the op about the same coverage 
as slowly moving the knob over something like a 25 kHz swath.

I personally prefer that the DX station uses whatever mode they have 
the most experience with.  I still remember having to chase the ever 
moving RTTY signal from Ducie.  But ultimately, it is whatever mode 
_they_ choose to operate in.

Why SSTV?  Well, perhaps they have more love ("amateur") for it than 
they have with for steam RTTY.  That is good enough reason for me.

73
Chen, W7AY


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