[Elecraft] 2.13 beta

[G4ILO]

Joe Subich, W4TV-3 wrote:
> 
> With a 1500 Hz center frequency the narrow filter should be made 
> available in DATA A.  I would also argue that it should be made 
> available in AFSK A if MARK <> 2125 (e.g. CF=1000Hz or 1360Hz). 
> Both DATA A and AFSK A are useful for PSK31 which can benefit 
> from the ultra narrow filtering. 
> 

Is there any benefit in using such a narrow flter for PSK? The DSP decoder
is only looking at the actual band of frequencies containing the signal so
it is, in effect, a narrow band filter already. The only possible benefit I
can see is if a strong close-in signal is activating AGC causing the weak
one to be depressed into the noise, but if it is that close IMD products
from the strong signal are probably going to make decoding the weak one a
lost cause anyway.

-----
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
KComm for K2/K3: www.g4ilo.com/kcomm.html
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