User Manual

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also use one 12 gauge wire for each positive and negative leads and split the stranded ends into three at the connector
end.
It is best to have an external switch between the external supply and the unit. Make sure the switch is in the open
position before connecting it to external supply. Otherwise make sure that when connecting the positive lead to the
external source that the 15-pin D connector is not connected to the SRPT-30/40A.
With the front panel AC LINE switch in the ON position, plug in the 15-pin D connector into the ACCESSORY
connector located in the rear of the SRPT-30/40A. Turn on external supply (if have a switch). With a voltmeter, measure
the voltage on the output of the external supply insuring that it is between 12 and 15 VDC. Switch the front panel AC
LINE switch to the OFF position. The unit should power up.
External DC Supply (15-30 Volt) Operation
Make sure that the SRPT-30/40A is not connected to an AC line. The front panel AC LINE switch does not control
the External DC Supply (15-30 Volt) operation. Therefore it does not matter what position it is in.
The external supply or battery must be capable of delivering 10 Amps if running the SRPT-40A at 50 Watts.
Connect up the unit using the Marti 585-142 15-30 VDC External Supply Cable. If choose to build your own cable then
follow the drawing on Figure 2B: 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 2). 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.
It is best to have an external switch between the external supply and the unit. Make sure the switch is in the open
position before connecting it to external supply. Otherwise make sure that when connecting the positive lead to the
external source that the 15-pin D connector is not connected to the SRPT-30/40A.
Plug in the 15-pin D connector into the ACCESSORY connector located in the rear of the SRPT-30/40A. Turn on
external supply (if have a switch). With a voltmeter, measure the voltage on the output of the external supply insuring
that it is between 12 and 15 VDC. The unit should power up.
From 16 to 20 VDC, the SRPT-30/40A will transmit up to 50 Watts RF output. From 20 to 30 VDC the SRPT-40A
maximum output power will derate linearly down to 20 watts.
CAUTION & WARNING
NEVER INSTALL AND CONNECT THE 12-15 VOLT AND THE 15-30 VOLT SUPPLIES AT THE SAME TIME.
ALSO, NEVER CONNECT THE 15-30 VOLT SUPPLY TO THE 12-15 VOLT PINS AND NEVER CONNECT THE
12-15 VOLT SUPPLY TO THE 15-30 VOLT PINS.
DOING SO MAY DAMAGE THE INTERNAL SWITCHING SUPPLY OR EITHER OF THE EXTERNAL DC
SUPPLIES.
Connect up Antenna
Connect antenna to the ANTENNA connector on the SRPT-30/40A rear panel. Connection of various antenna
systems is covered under INSTALLATION and ANTENNAS.