Marti Electronics SRPT-30, User Manual

Page: 26 / 129

8/7/2003
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In normal conditions, the SYNTHESIZER will not come “unlocked” unless sent a command to change to change to
a new frequency. However, other conditions can cause the SYNTHESIZER to come unlocked such as an AC line surge
or a sudden and very large change in VSWR. In those cases, the SYNTHESIZER will re-lock back on the assigned
frequency. The AFC LOCK LED will flash green until the SYNTHESIZER is locked. Once the SYNTHESIZER is
locked it will stay on, solid green.
ANTENNA Connector
Connection of various antenna systems is covered under INSTALLATION and ANTENNAS . It is only necessary
for the operator or announcer to see that the ANTENNA connector is tight and that the antenna is clear of objects which
may affect its radiation efficiency.
CAUTION & WARNING
THE ANTENNA CONNECTOR IS A TYPE “N” FEMALE CONNECTOR AND REQUIRES A MATING
TYPE “N” MALE CONNECTOR.
PLUGGING IN A “UHF TYPE (PL-259 OR SO-239)” INTO THE ANTENNA CONNECTOR WILL
DAMAGE AND SHORT OUT THE ANTENNA CONNECTOR. THIS COULD BURN UP THE PA
MODULE AND OTHER INTERNAL COMPONENTS.
ENCODE Switch
The internal subaudible encoder can be switched “ON” or “OFF” by the front panel switch. Encoding is used to
activate a repeater station, tape recorder, etc.
FREQUENCY SELECT Pushwheel Switches and EXECUTE Switch (SRPT-40A only)
Dial in the numbers that represent a frequency, channel number, or other command using the FREQUENCY
SELECT Pushwheel switches. Then press and release the EXECUTE switch to “send” the command numbers on the
FREQUENCY SELECT pushwheel switches to the internal controller to be decoded and executed. See the
OPERATION section for a listing and understanding of all commands.
F1/F2 Switch (SRPT-30 only)
Switching to the F1 position will cause the transmitter to lock onto the frequency that was configured at the factory
as “F1”. Switching to the F2 position will cause the transmitter to lock onto the frequency that was configured at the
factory as “F2”. The F1 and F2 frequencies are selected by the purchaser at the time of order.
AUDIO GAIN Controls
The GAIN potentiometer located above each input connector provides an independent level adjustment for that
input. Each GAIN potentiometer is adjusted as follows:
1.
Connect input source at normal audio level.
2. Turn GAIN potentiometer to maximum counter-clockwise (“OFF”) position.
3. Place TRANSMIT/STANDBY switch in “STANDBY” position and allow METER pointer to reach 0 VU. Slowly
increase gain (clockwise) until METER begins deflecting to the left on audio peaks. Maximum deflection should be
-3 to -5 VU on the METER scale. This indicates 100% modulation of the transmitter. Excessive gain settings cause
high compression values which result in annoying increase in background noise. A 600 ohm headset may be