Crown FM30-100-200-250-500 Remote
2.11
Program Input Fault Time-out
You can enable an automatic turn-off of the carrier in the event of program failure.
To enable this option, see illustration 2-17 on page 2-15. The time between program
failure and carrier turn-off is set by a jumper (JP1) on the voltage regulator board
(see page 6–17 for board location). Jumper pins 1 and 2 (the two pins closest
to the edge of the board) for a delay of approximately 30 seconds; pins 3 and 4 for a
2–minute delay; pins 5 and 6 for a 4–minute delay, and pins 7 and 8 for an 8–
minute delay.
2.12 Remote I/O Connector
Remote control and remote metering of the transmitter is made possible through a
15–pin, D-sub connector on the rear panel. (No connections are required for
normal operation.)
Remote I/O
SCA IN
RIGHT
MONITOR
COMPOSITE IN
R
LEFT/MONO
L
REMOTE I/O
1
2
3
+
CIRCUIT
BREAKER
B
A
T
T
E
R
Y
OFF
–
36 VDC
Illustration 2–16 Remote I/O Connector
Illustration 2-17 on page 2-15 summarizes the Remote I/O pin connections.
2–14
FM30/FM100/FM250 User's Manual
Pin Number
Function
1
Ground
2
(no connection)
3
Composite Out (sample of stereo generator output)
4
FSK In (Normally high; pull low to shift carrier frequency
approximately 7.5 kHz. Connect to open collector or relay
contacts of user-supplied FSK keyer.)
5
/Auto Carrier Off (Pull low to enable automatic turnoff of
carrier with program failure.)
6
Meter Battery (unregulated DC voltage; 5 volts = 50 VDC)
7
Meter RF Watts (1 volt = 100 watts)
8
Meter PA Volts (5 volts = 50 VDC)
9
/Ext. Enable (Pull low to disable internal stereo generator
and enable External Composite Input.)
10
a) 38 kHz Out (From stereo generator for power supply
synchronization.)
b) For transmitters equipped with tuner option, this pin
becomes the right audio output for an 8–ohm monitor
speaker. 38kHZ Out is disabled.
11
ALC
12
/Carrier Off (pull low to turn carrier off.)
13
Fault Summary (line goes high if any fault light is
activated.)
14
Meter PA Temperature (5 volts = 100 degrees C.)
15
Meter PA Current (1 volt = 10 amperes DC.)
1
8
15
9
Illustration 2–17 Remote I/O Connector (DB-15 Female)
Installation
2–15
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