[RTTY] Take Two RTTY Exchange

[Kok Chen]

On Jan 16, 2012, at 11:42 PM, Bill Turner wrote:

> If Ed sends 599 CA and it gets garbled so it prints 599 CO, the other 
> guy sees it's a valid state name and will copy it correctly but the 
> information is wrong.

This particular example is probably [sic] not a good choice, Bill :-).  

4 out of the 5 Baudot bits of an "A" would have to flip themselves to produce an "O."   A single "CA" printing as "CO" is going to be quite rare.

Threshold biasing from QRM that is on one side of the RTTY signal will not likely produce the CA-to-CO error either, since both A and O have the same Hamming weight.

On the other hand, "CA" turning into "VA" requires only a single bit change.

73
Chen, W7AY