Control, Led, & Connector Functions - Marti Electronics SRPT-30 User Manual

CONTROL, LED, & 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-30/40A 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 ground pins (pins 1, 11, and 12). Each of the three positive leads and each of the three negative leads
should be an 18 gauge wire. You may also use one 12 gauge wire for each positive and negative leads and split the
stranded ends into three at the connector end.
FOR 12-15 VOLT EXTERNAL SUPPLY, THE OPTIMUM VOLTAGE IS FROM 12 TO 15 VOLTS.
APPLYING A VOLTAGE LOWER THAN 12 VOLTS, WILL LIMIT THE MAXIMUM RF OUTPUT
ALSO, THE EXTERNAL BATTERY OR POWER SUPPLY SHOULD BE CAPABLE OF HANDLING A
CONSTANT 10 AMPS. THERE WILL BE A DROP IN VOLTAGE ACROSS THE POWER CABLES.
THE POWER CABLES SHOULD BE AS SHORT AS POSSIBLE AND AS HEAVY GAUGE AS
POSSIBLE. EXPECT A COUPLE OF VOLTS DROP WHEN OPERATING THROUGH A CIGARETTE
If powered from a 15-30 Volt supply, connect three positive leads of the supply to three 15-30VDC pins (pins 2, 3,
and 10). Connect three negative leads of the supply to three ground pins (pins 1, 11, and 12). Each of the three positive
leads and each of the three negative leads should be an 18 gauge wire. You may also use one 12 gauge wire for each
positive and negative leads and split the stranded ends into three at the connector end.
FOR 15-30 VOLT EXTERNAL SUPPLY, IF APPLYING A VOLTAGE LESS THAN 16 VDC, THE
SRPT-30/40A EXTERNAL B+ ADJUST POT ON THE TWO-STAGE RF POWER AMPLIFIER BOARD
IF THIS IS THE CASE, THE MAXIMUM RF OUTPUT POWER COULD BE LIMITED.
ATTENTION
POWER.
LIGHTER.
ATTENTION
SHOULD BE ADJUSTED TO ABOUT 12 VDC.
8/7/2003
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