[UK-CONTEST] UK Contest data modes in CC

[David G3YYD]

When working near the MUF the number of different ray paths is 
considerably reduced over that of using bands well below the MUF 
(Maximum Usable Frequency)

The more ray paths available then the probability of a problem with 
propagation induced phase changes causing an error increases 
substantially. QED 20m especially with low solar flux is going to be a 
very good bet for PSK. While 80m in the evening is not a very good idea. 
I remember QSOing in the very early days of PSK31 with Peter Martinez, 
G3PLX, on 80m and finding that propagation often totally destroyed 
communication but 45.45 baud RTTY was still OK.

73 David



On 26/07/2011 19:02, Neil Ackerley wrote:
> Actually, why is PSK so popular on 20m for rag-chewing as there must be much
> phase distortion on any sky-wave propagation.
>
> Neil, G3RIR
>
> -