Pira.cz Technical Forum

Radio Data System (RDS) => MRDS1322 => Topic started by: yoyo on May 23, 2012, 07:27:41 pm

Title: RT A/B Flag
Post by: yoyo on May 23, 2012, 07:27:41 pm

I'm looking for a little clarification on the proper use the RT A/B flag in the MRDS192...
From what I've read, it's a good idea to toggle the A/B flag any time the RT is changed.

I've tried changing it via RTEN right before sending a new message, and right after.  But either way, the radios I've tested with will still sometimes garble the message for a bit immediately following a change.

What's the best way to use the flag or change RT in general?

Title: Re: RT A/B Flag
Post by: Jan on May 23, 2012, 07:36:29 pm

Precise way is following:

1) Disable actual RT by sending RTEN byte (bit 0 set to 0).
2) Write new RT in the RT address space
3) Enable the RT by sending RTEN byte (bit 0 set to 1 and A/B flag bit toggled).

Note that some receivers may ignore the A/B flag or use this flag different way than the RDS standard specifies.

Title: Re: RT A/B Flag
Post by: yoyo on May 23, 2012, 10:13:41 pm

Thanks for the info!