On Sep 27, 2009, at 9/27 8:50 AM, Jim W7RY wrote:
> USOS does not effect transmitting?
Unfortunately, it does.
The transmitter has to check if a character with a numerical shift is
being send right after sending a space character. When USOS is used
at the receiving end, the transmitter is responsible for sending an
additional Baudot FIGS character between that space and the following
numeric.
The transmitter has to assume that the USOS receiver has shifted
itself into the LTRS shift when the receiver saw the space.
With Baudot, the space character occupies both the LTRS shift and the
FIGS shift partitions of the code table. So the normal way of sending
"599 03" is to simply send "599<space>03" and be done with it.
However, if the receiver is known to be using USOS, the transmitter
has to alter the character sequence to "599<space><FIGS>03" for the
"03" part to print correctly at the other end.
73
Chen, W7AY
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|