[RTTY] REV polarity

[Steve Holton]

You may have to deal with this at the rig if it has the option.
There are no standards as to which is Mark and which is Space when you 
change the keying/shift line.
With my FT1000MP MkV I had to reverse the polarity via a menu item to get 
it to work right when I switched from AFSK to FSK. Others have reported 
that some other rigs work directly while others also need to be reversed. 
This is a muddy area. My FT1000MP MkV manual says  " Closing and opening 
this line to ground cause mark/space keying" - It doesn't really say which 
is whether open is mark or space?? This is problem there is no consistency 
between rig manufacturers and software writers in this area. It may be 
possible to effect this in MMTTY but I was directed to change the rig when 
I raised this about a year ago.
GL
73 Steve N1NB

At 11:28 9/5/2002 +0000, you wrote:
>Hi,
>
>Just installed MMTTY it is working fb on RX.
>
>I'm using FSK, but seem to be TX-ing reverse polarity. Everything is 
>decoding fine on RX.
>Is there a way I can reverse my TX polarity within MMTTY that does not 
>affect the RX side of things?