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THE ‘SPLIT’ MODE (FM VERSION ONLY)
ENG
Page 24
16 THE ‘SPLIT’ MODE (FM VERSION ONLY)
The MPX SPLIT mode (available as an option
on FM version fitted with MPX option) allows the MPX OUT 2 output to
toggle between an external MPX signal applied to AUX 1 input (or AUX 2 – see J1 and J3 jumpers) and the MPX signal
internally generated. Switching is triggered by SPLIT Input on Digital Data Port (see paragraph 16.1).
The SPLIT function allows to easily manage that systems, where a flexible and inexpensive switching is required
between two MPX signals, f.i. the one associated to the Network (i.e. common to all transmitters) and the one associated
to a regional/local program or to advertising spots differentiated for selected broadcasting areas.
The following picture shows the THEORICAL (logic) scheme of MPX split circuit.
A
U
X
2
A
U
X
1
I
N
P
U
T
O
U
T
P
U
T
I
N
P
U
T
Output Level
SW1
Sw2
Split Control
MPX
SPLIT mode
SPLIT control
MPX - OUT 2 output LOGIC SWITCHERS
SW 1 SW 2
active Internal MPX open closed
enabled
unactive Fold-back of Aux 1 signal * closed open
disabled Internal MPX (all time long)
* Aux 1 level is controlled via trimmer
** Depending on Jumper configuration on MPX board, external MPX could be also injected from AUX2 input.
16.1 HOW TO ACTIVATE THE ‘SPLIT’ MODE (FM VERSION ONLY)
The ‘Split’ mode (available as an option) is activated through a dedicated input on the OPTO INTERFACE port.
The OPTO-INPUT Port is a 9-pin female Interface (on DB-9 connector) which provides 2 optoinsulated “trigger” inputs:
one for SPLIT mode activation and one for TA flag switching
Once enabled, SPLIT activation will cause SPLIT LED on rear panel
to light.
The following table displays internal connection of Digital Port.
PIN DESCRIPTION PIN DESCRIPTION
1
Cathode of photocoupler SPLIT input
6 GND
2
Anode of photocoupler SPLIT input
7 GND
3 + 5 V via internal 470 Ohm resistor 8 GND
4
Anode of photocoupler TA input
9 GND
5
Cathode of photocoupler TA input
Pins 6, 7, 8, 9 are linked together and provide an insulated GND connection.
A current-limited + Vdc source is available on pin 3 (+ 5 V via 470 Ohm resistor).
The SPLIT mode may ba activated either by a TTL command or a CLEAN CONTACT