User manual

Using the RDS SECTION (FM version ONLY) ENG
Page 73
29.7 HINTS AND TIPS ABOUT DYNAMIC PS MODE
When programming PS durations in Dynamic mode, two ‘gold’ rules should be taken into account. They are related to
the ‘physics’ of RDS channels and are completely independent from RDS encoder architecture.
WARNING: if the PS is constantly changed (as in the PS Scrolling mode), it is possible that some
receivers will display a mixture of old and new PS message on the same display. In some cases, no PS
will be displayed at all. This may occurs as message byte group order is not univocally recommended by
the CENELEC RDS standard and strictly depends on the coder/decoder physical implementation. Neither
the RDS encoder in the processor nor the car receiver are faulty. In case of PS Scrolling selection, we
therefore suggest to choose low display speeds. PS scrolling and PS Sequence mode are against the
broadcast regulations of most countries: refer to appropriate ‘governing body’ for further
information.
The encoder’s manufacturer can not be held responsible for uncorrect PS use!
Drivers CAN NOT look at messages displayed on their radio cars longer than a few seconds. LONG PS SEQUENCES
are therefore not only be distracting car driver but they are simply.... not read!
Furthermore, they affect the quality of RDS broadcasting overall, as the Radio Station default Name refresh could be not
frequent enough.
PS scrolling lenght has been thus intentionally limited to 32 characters, as that lenght is largely suitable for a large set of
meaningful messages.
Message synthesis... means quality in Dynamic RDS broadcasting
29.8 ALTERNATIVE FREQUENCIES LIST
The list(s) of alternative frequencies give information on the various transmitters broadcasting the same programme in
the same or adjacent reception areas, and enable receivers equipped with a memory to store the list(s), to reduce the
time for switching to another transmitter. This facility is particularly useful in the case of car and portable radios.
The alternative frequencies (AF) list can be transmitted following two methods: A Method and B Method (see next page).
In both methods the alternative frequencies lists must contain only the frequencies of the adjacent transmitters and
repeaters with overlapped transmitting areas.
To compile the AF lists use the following procedure:
- Choose one of the 8 lists ( from AF1 to AF8)
- Select the AF from the available frequencies in the left window and drag & drop it into the AF list
- To remove a frequency from the list follow the procedure drag & drop to move to ‘recycle bin’ or cancel them by
pressing on the ‘Cancel’ button.
A second loading procedure
is provided:
- Click the label of the AF List to be filled (f.i., click AF2 label): it will turn red
- Double click the frequencies listed on the left window: selected frequencies will be automatically loaded into the
highlighted list.
Lists containing at least one AF are shown in blu color.