Hello Eric, I am basically doing the same you did on the RDS code and
specification; right now I have introduced syndrome based sync and
indeed it
looks like it get synced much faster. I am using the wfm receiver (non
pll),
but, not having implemented the loss of sync yet, I cannot tell how fst
sync
comes and goes 
The ideal thing would be to build up a wxwidget from python able to show
the
rds data in a fancy way, in order to complete the FM receiver with RDS
info
on GUI - given the time left over from work I think it’ll take ages, and
right now priority one is to work Laccadive Islands DXpedition
73 matteo iz2eeq
Matteo C. wrote:
73 matteo iz2eeq
Hello,
The specification gives some suggestions about loss of sync. I just
count up to 20 errors in a row then resync.
I want to implement error correction. I came across some example code
for RDS when researching BCH codes. A “RDS Explorer” app would be neat.
Have it display the PI, PS, RT and various codes. Right now I am
dumping text out the console:
PI KAKZ Pgm Top 40 Group 0A PS = Beyonce Mono
PI KAKZ Pgm Top 40 Group 8A UKN 1: 9 2: 41da 3: 482c
PI KAKZ Pgm Top 40 Group 0A PS = Beyonce Mono
PI KAKZ Pgm Top 40 Group 2A RT: txt seg = 28, a/b = 1
RT A: Beyonce - Irreplaceable - KISS 108 - s
RT B:Beyonce - Irreplaceable - KISS 108 - s
PI KAKZ Pgm Top 40 Group 0A PS = Beyonce Mono
PI KAKZ Pgm Top 40 Group 8A UKN 1: 9 2: 197 3: 410c
PI KAKZ Pgm Top 40 Group 3A AI Group 8A Message = 40c0 AID = cd46
PI KAKZ Pgm Top 40 Group 0A PS = Iryonce Mono
PI KAKZ Pgm Top 40 Group 2A RT: txt seg = 32, a/b = 1
RT A: Beyonce - Irreplaceable - KISS 108 - s
RT B:Beyonce - Irreplaceable - KISS 108 - s
PI KAKZ Pgm Top 40 Group 0A PS = Irrence Mono
PI KAKZ Pgm Top 40 Group 8A UKN 1: 9 2: 197 3: 410c
PI KAKZ Pgm Top 40 Group 0A
So far I found one station has the traffic flag on all the time and the
station I dumped above has the wrong PI set. Most Stations put the
artist and title in a dynamic PS as above (A no-no in Europe). Several
stations are broadcasting traffic information (AID = cd46).
The factory radio in my car decodes RDS but after comparing the info the
car radio does not display RT messages.
73 Eric
