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13.1.8
Tuner-1 Data
– AF01-32 AF33-64
Before any explanation about how does Wolf 1MS/2MS decode and show AF frequency, some information on how does
AF Lists are encoded by RDS Encoders.
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There are two ways to transmit lists of alternative frequencies:
Method A and Method B .
In both cases the lists should include only those frequencies for the nearest transmitters and repeaters (with overlapping
coverage areas). Generally speaking,
Method A is used when the list contains no more than 25 frequencies, and
Method B when the list is longer (for a maximum of 24 lists). Method B is recommended when splitting areas or when
different programs are broadcast.
NOTE : use of encoding method A or B is not explicitly assigned by a dedicated signal to the receiver, as the latter is
capable of identifying which method is used by analyzing the transmitted data structure (whether or not they are
organized in pairs).
METHOD A
Compile the AF1 list assigning the tuning frequency (i.e. the frequency carrying the list of alternative frequencies) in the
first position, and then continue in strictly increasing order with the alternative frequencies transmitting exactly the same
program.
We recommend recording the alternative frequencies (those of adjacent transmitters and repeaters with overlapping
coverage areas) on each transmitter, being careful that the first position indicates the frequency carrying the list of
alternative frequencies.
METHOD B
As mentioned earlier, Method B is used with high numbers of alternative frequencies and/or when the transmitter also
has frequencies that broadcast different radio program at various times of day (splitting, local programming, etc.).
In the latter instance, the mobile receiver should check whether the AF is broadcasting the same content before selecting
another frequency.
Each list begins with the
tuning frequency (for which the list is valid) and then contains up to 12 pairs of frequencies in
sequence, each containing the tuning frequency and an alternate. If there are more than 12 possible alternative
frequencies, the list continues in other lists in the same manner.
The order of the frequencies in each pair follow the rules below:
- If the order is increasing, the alternative frequency broadcasts the same programming as the
tuning frequency.
- If the order is decreasing, the two frequencies have different programming
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