Marti Electronics SRPT-30 User Manual page 17

SRPT-30/40A
Mobile Remote Control
Remote control of the SRPT-30/40A transmitter requires a switch to control primary 12-15 VDC power (or 15-30
VDC) and a second switch to control the transmit function. The primary 12-15 VDC (or 15-30 VDC) control
requirement can be met by tapping the ignition switch circuitry of the vehicle. The "transmit" function can be performed
by installing a switch on the vehicle.
FIG. 2A and 2B show the electrical circuit of a mobile installation for 12-15 VDC (585-141) and 15-30 VDC (585-
142), respectively.
Mobile Repeat
Mobile repeat operation is covered under STATIONARY REMOTE BROADCAST INSTALLATION.
Electrical connection for a 12-15 Volt supply is made through Mobile Repeat Cable No. 585-139. This cable is
connected between the SRPT-30/40A transmitter and AR/CR-10 receiver. Power is obtained by connecting the fused
RED wire to the 12-15 VDC battery or supply. The supply must be capable of delivering 10 Amps minimum. The
electrical diagram of this cable is shown in FIG. 3A.
WHEN OPERATING THROUGH A CIGARETTE LIGHTER, THERE MAY BE A ONE TO TWO VOLT
DROP DUE TO THE LENGTH OF INTERNAL VEHICLE WIRING AND THE LARGE AMOUNT OF
CURRENT REQUIRED TO OPERATE THE SRPT-30/40A AT HIGHER OUTPUT POWERS.
THE SRPT-30/40A WILL OPERATE WITH AN EXTERNAL INPUT VOLTAGE AS LOW AS 7 VDC.
HOWEVER THE MAXIMUM RF OUTPUT POWER WILL DE-RATE LINEARLY AS THE EXTERNAL
Electrical connection for a 15-30 Volt supply is made through Mobile Repeat Cable No. 585-140. This cable is
connected between the SRPT-30/40A transmitter and AR/CR-10 receiver. Power is obtained by connecting the fused
BLUE wire to the vehicle 15-30 VDC battery or supply. The supply must be capable of delivering 10 Amps minimum.
The electrical diagram of this cable is shown in FIG. 3B.
Automatic Morse Code Station Identifiers
The SRPT30/40A-450T TSL RPU's are used for sending data back from a transmitter site to the studio (also known
as telemetry). In older FCC requirements, un-manned transmitters required an automatic remote control system to send
data back to the studio for verifying that the transmitter was operating properly. Many broadcasters today are still using
NOTICE
INPUT VOLTAGE DROPS BELOW 12 VDC.
700-252-2
MOBILE MOUNT FASTENERS
8/7/2003
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