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CONTROL & CONNECTOR
FUNCTIONS
ACCESSORY Input Connector
Audio Input:
When Input 4 is switched to "HI" level, audio can be fed into pins 4 and 5 of the ACCESSORY connector on the
rear of the transmitter. Input level should be between 0.2 volts to 2.0 volts rms. The output impedance of the device
connected to Input 4 should be 8 - 600 ohms. For unbalanced operation ground pin 5 to pin 1, 8, 11, or 12 and connect
audio to pin 4. Use standard 15-pin "subminiature D" female connector with cover.
Transmit Control:
"TRANSMIT" control can be accomplished remotely by a switch circuit connected between pin 15 and one of the
available ground pins (pin 1, 8, 11, or 12).
External DC supply:
The SRPT-40A can be powered externally by either a 12-15 Volt DC supply or a 15-30 Volt supply. If powered off
a 12-15 Volt supply, connect three positive leads of the supply to pins 6, 7, and 14. Connect three negative leads of the
supply to three of the four ground pins (pins 1, 8, 11, and 12). Each of the three positive leads and each of the three
negative leads should be an 18 gauge wire.
FOR 12-15 VOLT EXTERNAL SUPPLY, THE OPTIMUM VOLTAGE IS FROM 13.5 TO 14.5 VOLTS.
APPLYING A VOLTAGE LOWER THAN 13.5, COULD LIMIT THE MAXIMUM RF OUTPUT POWER
If powered off a 15-30 Volt supply, connect four positive leads of the supply to the four 15-30VDC pins (pins 2, 3,
9, and 10). Connect four negative leads of the supply to the four ground pins (pins 1, 8, 11, and 12). Each of the four
positive leads and each of the four negative leads should be an 18 gauge wire.
FOR 15-30 VOLT EXTERNAL SUPPLY, IF APPLYING A VOLTAGE LESS THAN 16 VDC, THE
SRPT-40A INTERNAL B+ SHOULD BE ADJUSTED NO MORE THAN 12 VDC.
IF THIS IS THE CASE, THE MAXIMUM RF OUTPUT POWER AND/OR THE OVERALL
ATTENTION
AND/OR LIMIT THE OVERALL FREQUENCY RANGE.
ATTENTION
FREQUENCY RANGE COULD BE LIMITED.
13
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