[RTTY] Confused with USOS

[Phil Sussman]

Chen,

I'm confused - perhaps because I can't easily visualize the set-ups:

Here are the confusing (in my mind) possibilities

SENDING STATION                              RECEIVING STATION

Transmitter USOS   Receiver USOS             Transmitter USOS      
Receiver USOS

       OFF                OFF                      OFF                 OFF
       OFF                OFF                      OFF                 ON
       OFF                OFF                      ON                  OFF
       OFF                OFF                      ON                  ON

       OFF                ON                       OFF                 OFF
       OFF                ON                       OFF                 ON
       OFF                ON                       ON                  OFF
       OFF                ON                       ON                  ON

       ON                 OFF                      OFF                 OFF
       ON                 OFF                      OFF                 ON
       ON                 OFF                      ON                  OFF
       ON                 OFF                      ON                  ON

       ON                 ON                       OFF                 OFF
       ON                 ON                       OFF                 ON
       ON                 ON                       ON                  OFF
       ON                 ON                       ON                  ON

Thus, I have 16 'possibilities'

Questions:
   1. Are any of these possibilities actually moot?
   2. Isn't USOS a 'RECEIVING' parameter? What does USOS on transmit do?
   3. Is there any type of 'handshaking' to show the other stations  
use of USOS?
   4. What do you recommend as the best way to set up USOS for my station

Thanks,

de Phil - N8PS

----

Quoting Kok Chen <chen at mac.com>:

>
> On Feb 11, 2013, at 9:41 AM, Wa3frp wrote:
>
>> As I remember, USOS is enabled on the receiver's end and adds the  
>> extra LTRS on space.  I don't believe that the transmitting station  
>> sends a LTRS character along with each SPACE character that it  
>> detects.
>
> That is correct.  From the transmitter's viewpoint, each SPACE is  
> simply an "implicit LTRS."
>
> The transmitter's only responsibility when using USOS, is to change  
> its own state to LTRS right after sending the SPACE.
>
> If a FIGS character comes after a space, the transmitter will then  
> automatically insert an additional FIGS code first.
>
> 73
> Chen, W7AY
>
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