Use and maintenance manual
Page 31
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3. USER INSTRUCTIONS
3.4.10.
RDS Encoder
Programming
Alternative frequencies
The Alternative frequencies section allows 16 lists of different frequencies to be
programmed, each in mode A or B. 8 lists are displayed at a time and with each one,
the mode (A or B) with which it was programmed, the header frequency (this field is filled
only if mode B has been used) and the number of frequencies in the list. To access a list
just click the corresponding key with the mouse; a display will appear showing the mode
and the list of possible frequencies on the left, and the frequencies in the list on the right.
Double-click on a frequency contained in the left-hand list and it will be added, if not
already present, to the list on the right. With mode A, it is possible to create a list with a
maximum of 25 frequencies compared with 12 in mode B.
Method A/B
The EBU standard allows for the possibility of transmitting the set of frequencies
to a network of transmitters in two modes, A and B.
- Method A allows transmission of one or more lists of frequencies, each upto a maximum
of 25.
- Method B allows transmission of as many lists as there are transmitters in the network
Each list is headed with the frequency of the transmitter to which it corresponds
and contains all the frequencies of adjacent transmitters.
Each receiver is designed to store a certain number of alternative frequencies
which will be searched automatically for a new frequency when the current signal is too
weak to receive. The search is as fast as the list of alternative frequencies is short. When
the number of transmitters exceeds 12, it is advisable to use method B in which the rece-
iver stores only the list corresponding to the header frequency to which it is tuned, so
facilitating a faster change of frequency.
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