[Elecraft] K2 and digital modes

[G4ILO]

Simon Brown (HB9DRV) wrote:
> 
> Julian suggests running a bar of ALC - I very strongly disagree. Never,
> ever 
> run any ALC with PSK as it degrades the quality of the signal and makes 
> decoding more difficult.
> 
> With digital modes *always* aim for a 100% linear signal. It's not the
> power 
> but the quality / purity that matters. What may look good on the other 
> station's waterfall is not always the best for decoding.
> 
> It's not just what you transmit but what you don't transmit that matters.
> 
Simon, what you say may be true of most radios but WRONG about the K2. This
Elecraft document http://www.elecraft.com/Apps/PSK31_KSB2_mods.htm describes
a modification that was made to early K2s that was since I believe
incorporated in production. It changes the way the ALC works in data modes.
It specifically recommends setting the level to one bar of ALC. I have
always operated my K2 like that and when I have monitored my signal on
another radio the IMD is typically -32dB.

-----
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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