[RTTY] USOS Question

[Phil Sussman]

Yes, Chen, you are correct, I goofed in case #8. Just a test of
your keen powers of observation, eh? <grin>

Meanwhile, I was advised that:

> The "UOS" button on the MMTTY main window affects only receive. It 
> simply treats received text as if there were a LTRS character after 
> every space. Overhead: none. It has no effect on transmitted text.

> In the MMTTY Setup window under the TX tab, in the top centre "TX" pane, 
> the first check box is labelled "UOS". When this is checked, MMTTY will 
> send a FIGS character whenever a FIGS case character is to be sent 
> immediately following a space. Overhead: 1 extra FIGS character inserted 
> into every "<number><space><number>" combination. Incidentally, the 
> description of this TX UOS option in the MMTTY Help file is inaccurate; 
> it suggests that LTRS is also inserted into the transmit string between 
> a space and a letter, but a bit of experimenting demonstrates that this 
> is false - the only extra characters inserted by this option are FIGS 
> characters before numbers.

So, how does that affect my USOS conception? If there an effect?

73 de Phil - N8PS

----------------------------

Quoting Kok Chen <chen at mac.com>:

> Phil N8PS wrote:
> 
> > USOS TX off  USOS RX off     USOS TX off USOS RX on
> 
> Phil, I don't think you will find many people who turn USOS on for  
> receive but turn it off for transmit and vice versa.  As an example,  
> cocoaModem does not even allow you to do that (USOS is a "universal  
> preference" that is applied to both receive and transmit directions in  
> cocoaModem), perhaps there are software that will?
> 
> For obvious reasons, transmitting and receiving Mark/Space polarities  
> in RTTY need to be independently selectable, but in the case of USOS,  
> I am not sure there is any advantage of using USOS in one direction  
> and not using USOS in the other direction.  The 16 cases that you  
> listed show that it a complete mess if people were allowed to  
> independently use USOS for the two directions.
> 
> By the way, the 8th case that you listed is a dupe; you probably meant:
> 
> USOS TX off  USOS RX *ON*     USOS TX on  USOS RX on
> 
> 73
> Chen, W7AY
> 
>