[RTTY] AFSK RTTY on USB question

[Phil Sussman]

You will be transmitting/receiving in reverse (RTTY is polarity sensitive).
So, Mark and Space will be reversed. In addition the 'dial' frequency will
be 'off' in the reverse direction. The AFSK tone frequency can also fall
outside the filters.

As a result I use low tones (1200/1400Hz) on USB - in the European fashion, 
so as to fall better within the USB bandwidth.

Note: You mention "PSK", if you're using PSK-31, as I understand it, there
is no reverse polarity problem (NRTZ) only the display frequency -vs- the
'center' frequency. I prefer Center to Mark frequency convention just for
ease of tuning and understanding.

Good luck,

73 de Phil - N8PS

-----------------

Quoting David VE3VID <ve3vid at hotmail.com>:

> 
> Sorry if this is a dumb question.  What would happen if I transmitted AFSK
> RTTY on USB rather than LSB.  I am taking a QRP rig to the arctic for PSK,
> but it does not transmit LSB, only USB.  If I try calling CQ on USB will my
> signal be decodable?  
> 
>  
> 
> David
> 
> 
> 
>      VE3VID          Located in rural Canada
> Solar power.  Wood heat.
> Mosley tribander @ 22m
> 2element delta-quad on 40m
> Lots of space for dipoles,
> bears and wolves......73
> 
> http://www.ve3vid.webs.com/
> 
> 
>                                                
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