Inputting Audio - Marti Electronics SRPT-40A User Manual

an inch behind the POWER ADJUST bezel ring) to adjust the forward power to a desired output power as indicated on
the METER.
What Frequency Will the SRPT-40A Power-Up on?
If you're not sure what frequency the SRPT-40A will power up on, first make sure that the POWER ADJUST pot is
at a minimum (turned fully counter-clockwise) before powering up the SRPT-40A. After the SYNTHESIZER is locked
and the TRANSMIT/STANDBY switch is set in the TRANSMIT position, monitor the RF output with a frequency
counter. If necessary, increase the POWER ADJUST pot (turn clockwise) slowly until the frequency counter registers a
frequency reading.
NEVER CONNECT THE FREQUENCY COUNTER DIRECTLY TO THE RF OUTPUT CONNECTOR
THE FREQUENCY COUNTER SHOULD BE COUPLED OFF OF AN RF COUPLER OR A WATT
EXCEEDING THE INPUT POWER RATING OF THE FREQUENCY COUNTER COULD DO

Inputting Audio

Plug in microphones (Inputs 1 - 3) or tape player (Input 4 internally switched to "HI" position; See MIC Input
Connections, above) and check operation by setting the METER CONTROL knob to the AUDIO COMPRESSION
position and observing the compression on METER and by a headset plugged into MONITOR jack. Set AUDIO GAIN
controls paragraph in the CONTROL & CONNECTOR FUNCTIONS section for how to adjust for no more than -3 VU
audio compression on the METER.
Changing Output Frequency Direct
To change the frequency of the SRPT-40A, the S1 dip-switches on the Front Panel Control & Meter board (800-
378) behind the front panel (see the SRPT-40A Adjustment Locations) need to be set with switches 1 and 2 in the "ON"
position and switches 3 and 4 in the "OFF" position. These positions are the normal position and are set at the factory,
so there should be no need to remove the top cover.
When the S1 switches are set as described in the last paragraph, then all that is required is to enter the desired
frequency from left to right into the FREQUENCY SELECT pushwheel switches and then press and release the
EXECUTE pushbutton switch.
If a valid frequency is entered and the EXECUTE pushbutton is pressed and released, then the RF output power will
immediately turn off (if it was on to begin with) and the SYNTHESIZER will go through it's normal routine in searching
and locking onto the requested frequency. When the frequency is found, the AFC LOCK LED will stop flashing and
illuminate solid green. After three seconds the TRANSMIT LED will stop flashing and illuminate solid red (assuming
the TRANSMIT/STANDBY switch is in the TRANSMIT position) and the SRPT-40A will resume transmitting at the
new frequency and at the same output power it was before leaving the previous frequency.
WARNING
OF THE SRPT-40A.
METER.
INTERNAL DAMAGE TO IT.
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