[1000mp] AFSK RTTY Polarity

Jim Preston [email protected]
Sun, 04 Apr 2004 16:01:47 -0700


Chris,

Yes, RTTY is normally received (and transmitted when using AFSK) in LSB 
by tradition. If you are receiving in LSB then the software should 
decode properly with out changing the polarity. I know MMTTY works this 
way. I haven't tried the other software you mentioned.

Jim N6VH


Chris Brougham wrote:

> Hi Folks,
> 
> I'm a little confused about AFSK RTTY on the Mark V. Whenever I tune in 
> to an RTTY signal I have to change the polarity on whatever software 
> package I'm using to properly decode the signal. I've tried MixW, MMTTY, 
> and TrueTTY and each program  needs to have the reverse RTTY flag 
> toggled on, so I'm assuming this is a radio issue. I understand there's 
> an easy set option to force PKT to USB, but shouldn't RTTY be LSB? I'm 
> totally new to RTTY and would like to get the settings right on the 
> radio before I call CQ!
> 
> Any help would be greatly appreciated.
>