[NLRS] PSK31 on 2m SSB

[Andrew T. Flowers, K0SM]

I forgot to copy the reflector in on my response to Dan.   Here it is 
for those who care....


Andrew T. Flowers, K0SM wrote:

> Dan,
>
> There's an issue with PSK at VHF that many folks from HF experience 
> don't consider.  Starting around 2m you'll find that multipath 
> propagation causes phase distortions well beyond the 31.25 Hz 
> bandwidth of PSK31.  This is simply because the scattering media are a 
> significant percentage of the wavelength in terms of their physical 
> size.  I'm sure you've heard the CW note go from pure tone to a 
> two-tone or even a buzz on these sorts of paths.  Also, many VHF 
> radios, particularly older ones, have the same frequency tolerances as 
> their HF counterparts.  An inconsequential drift of 5 Hz at 14 MHz 
> becomes 50 Hz at 2 meters when multiplied up.  I know my FT-290R/II 
> had a real hard time staying in one place long enough for PSK31 even 
> when the path cooperated.
>
> That's been my experience with PSK31 on 2m.
>
> Andy K0SM/2