R.V.R. Elettronica TRDS 4001, User Manual

Page: 28 / 62

TRDS 4001
24 / 36 User Manual Rev. 4.0 - 23/03/01
For the alternative frequencies transmission, the program uses two methods: A
(default selectioned) and B.
The two methods use the following size:
A METHOD: every station send a nearly frequencies list, after the contained
frequencies number (max. 25);
B METHOD: every station send a frequencies list for every transmitters which
it gets.
The list begins with the chief frequency and it follows with the by
transmitters used ones (max. 12 and nearby at the current user
areas).
The method B is recommended when the frequencies list is long, as allows at
autotuning the system to check a smaller frequencies number in order to more
quickly search the new syntony frequency. At the contrary, if the frequencies number
is small, the method A is recommended, as it allows a smaller data number
transmission.
In order to set the method B, it’s necessary to place the cursor on the window
showing "METHOD B" and to press the spacebar; if a "X" appears, the procedure
is right.
In addition to the "METHOD B", on the screen appear other two windows:
FREQUENCY LIST and ACTIVE FREQUENCY, both of them containing a
frequencies list. The submultiples of 100 khz are not admitted by the standard. On
pressing ENTER on a into a FREQUENCY LIST frequency you select the one
which is showed on the ACTIVE FREQUENCY window. If the setted frequency is
already in the ACTIVE FREQUENCY list, the PC utters indicating the error.
On pressing ENTER on a frequency of the ACTIVE FREQUENCY list you cancel the
same frequency.
The setted data are revised on the encoder only on pressing ENTER when the screen-
command UPDATE is pointed out on the screen; they are neglected on pressing the
screen-command EXIT.
Normally, these data are setted only for the first time.
F) MESSAGE MANAGEMENT
It’s used to set or modify the user messages contains (max. 8) which are visualized
on receivers equipped of RDS syntonized with the broadcaster.
Every message contains max 16 words of 8 characters and every words could be
send and visualized on the receiver display for a time changing from 2 to 60 seconds.
On selecting the voice "MESSAGE MANAGEMENT" from the chief menu, it appears