[RTTY] (no subject)

[Phil Sussman]

Just remember the old Lucky Strike commercial

L-S-M-F-T

Lower Space Means Fine Teleprinting

de Phil - N8PS

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Quoting Kok Chen <chen at mac.com>:

> 
> On Mar 13, 2008, at 3/13    9:25 AM, Gedking at aol.com wrote:
> 
> > TX5C running USB es reverse??? I got em on 14084 LSB no reverse. I  
> > thought
> > RTTY LSB common practice.??
> 
> You can use either USB or LSB as long as you arrange to transmit so  
> that the Mark carrier is the higher of the two RF carriers of an RTTY  
> tone pair, and properly receive and decode an RTTY signal that was  
> sent with the Mark tone being the higher of the two RF carriers.
> 
> If you use LSB receive, the Mark carrier becomes the lower tone of  
> the tone pair at the AF output of the receiver.  Many surplus modems  
> from the old days used the 2125/2295 tone pair with Mark assumed to  
> be the 2125 Hz (lower audio) tone.  That is why it was more  
> convenient for someone back then to operate RTTY using LSB.
>