Radio Data System (RDS) > General Discussion about the RDS

Simple TA plus FM sender

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Jan:
The most important thing is that RDS standard (EN 50067 or EN 62106) does not define anything like continuous searching the band for TA or alarm PTY etc. Thus applying the situation proposed the receiver's behavior is undefined in general. Real emergency system cannot depend on this wobbly base.
Yes, maybe some receivers include the TA searching as a bonus feature (and there are still other preconditions - for example the feature must be activated by user or the stations of interest must be stored in preset memory, otherwise it will not be included in the searching). The question is: how many receivers? Imagine 100 cars. How many receivers present? How many turned on? How many equipped with RDS? How many equipped with secondary RDS tuner? How many enabled by user for TA searching? In my opinion the result is a few % in the best case. Of course it may be enough for some applications. This must be taken into consideration first - you can never speak to all. If this is not a real problem, then you can make some research to find the % value and compare it with your needs.
As I told before - the RDS system does not guarantee this facility as it has no support in the standard.

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