[RTTY] More GRITTY observations

[Phil Sussman]

Chen,

As usual, I'm confused by USOS and the functionality between stations.
I understand there are only 16 possible combinations. -See below

Is there an easy explanation of the best way to set your (my) station so as
to work best with the four (4) possible combinations used by any other  
station?

Thanks Chen,

73 de Phil - N8PS


     STATION #1                                STATION #2
SENDING      RECEIVING                    SENDING         RECEIVING

USOS OFF      USOS OFF                     USOS OFF        USOS OFF
USOS OFF      USOS OFF                     USOS OFF        USOS ON
USOS OFF      USOS OFF                     USOS ON         USOS OFF
USOS OFF      USOS OFF                     USOS ON         USOS ON

USOS OFF      USOS ON                      USOS OFF        USOS OFF
USOS OFF      USOS ON                      USOS OFF        USOS ON
USOS OFF      USOS ON                      USOS ON         USOS OFF
USOS OFF      USOS ON                      USOS ON         USOS ON

USOS ON       USOS OFF                     USOS OFF        USOS OFF
USOS ON       USOS OFF                     USOS OFF        USOS ON
USOS ON       USOS OFF                     USOS ON         USOS OFF
USOS ON       USOS OFF                     USOS ON         USOS ON

USOS ON       USOS ON                      USOS OFF        USOS OFF
USOS ON       USOS ON                      USOS OFF        USOS ON
USOS ON       USOS ON                      USOS ON         USOS OFF
USOS ON       USOS ON                      USOS ON         USOS ON




Quoting Kok Chen <chen at mac.com>:

>
> On Apr 27, 2015, at 8:41 AM, David G3YYD wrote:
>
>> One thing I noticed is some transmissions that always send a ltrs shift
>> after a space character. What a waste of transmission time and the extra
>> unnecessary characters adds to the potential for errors. Anyone know which
>> software/hardware is doing this?
>
> There is actually a rational reason for this.  Especially outside a  
> contest, where the millisecond counters don't thread :-).
>
> If you are sending USOS, and the other end receives with a non-USOS  
> decoder, the extra LTRS shift avoids the infinite loop of "AGN? AGN?  
> from people who don't know how to interpret "TOOQWE."
>
> The extra LTRS shift makes the sender compatible with both USOS and  
> non-USOS receivers.  It might be the only way to ensure  
> interoperability between USOS and non-USOS (though I haven't spent  
> that much time in the past to come up with other solutions).
>
> Perhaps a more optimal way to ensure USOS interoperability is to  
> send extra LTRS only when repeating an exchange to the same caller.
>
> If I were using USOS, I would use the extra LTRS when calling a  
> DXpedition.  Who knows what they are using.
>
> 73
> Chen, W7AY
>
> _______________________________________________
> RTTY mailing list
> RTTY at contesting.com
> http://lists.contesting.com/mailman/listinfo/rtty
>