wybitny2
Which RDS part?
The RDS-PS, RDS-PI, RDS-PTY, RDS-RT(+) and RDS-TA/TP showing you informative text (RT) and switching to stations that currently broadcast traffic information (TA and TP) has functioned since approximately 2016/2017 on the units that have the RDS functionality enabled inside the FM chip. Earlier units came with FM chips without RDS support. Some of the very cheap 7731 units using a very cheap FM chip, still don't have RDS enabled in the FM-chip. Meaning that RDS will never (software based) function on those units as long as the FM-chip doesn't support it.
I am talking about RDS-AF. That has been non-functioning since 2015 as in China they do not use RDS-AF. Dudu is now trying to get that working for about a year.
About 6 months ago @DUDU-HUANG suggested to use the same pre-defined alternative stations for the dudu-radio, as can also be used within navradio. Having now the FM-<frequency>-<station>.png for (almost) all regions in a country makes me wonder if they use that system, maybe in combination with "real" RDS-AF. Note that for "smooth" functioning of RDS-AF, like builtin car radios use, you need to have 2 FM-chips. These units do not have that.
