[Elecraft] K2 and digital modes

[G4ILO]

pappy_c wrote:
> 
> Simon, does this apply to RTTY as well?  I have had
> good results by keeping the power down with PSK-31,
> but not such good results with RTTY.  Most of my RTTY
> is in DX pileups and my results seem better if I run
> the transceiver a bit harder and drive my amp to 300
> watts or so, but my experience is very limited.  I am
> using you DM 780 with an ACER Aspire 5610Z computer
> running Vista.
> 
RTTY, or any FSK mode (such as MFSK) does not need a linear PA at all. It is
only where phase shift keying is used, which causes amplitude changes to
take place, that linearity is important.

The reason you haven't had such good results with RTTY (and nor have I) is
that RTTY is not so easy for the decoder to dig out of the noise (it
occupying a wider bandwidth doesn't help, for a start.) Plus, many RTTY
operators run very high power, wh=hile most PSK31 operators use less than
50W, often quite a lot less, so the RTTY stations may be loud with you, but
you may not be loud with them.

-----
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
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