18
6888882V04
RM1200 Operation
General
The following instructions present operating procedures specific to the RM1200 also used with the
RM125 or RM125R as exciter. It is assumed that the operator is familiar with the RM125/RM125R
operating procedures, as described in the Publication 6888882V02, “RM125/RM125R Owner’s
Guide”, Publication 6886867J01, “Owner’s Guide, MICOM-3F/3T/3R HF-SSB Transceivers”, and the
applicable MICOM-3 Supplements that cover optional features.
Preparations for Operation
1. Set the REMOTE CONTROL switch on the rear panel of the RM125/RM125R to the OFF
(down) position.
2. For the RM125R, set the internal speaker switch to ON (up).
Calibration Procedure
After installing a new 1 kW amplifier, it is necessary to calibrate the automatic transmit power level
loop, which adjust the exciter transmit level to match the 1 kW amplifier requirements.
Calibration instructions for a 1 kW amplifier used in conjunction with the RM125/RM125R are given
in Publication 2072-09538-00, “Radio Service Software (RSS) V3.0, User’s Guide” (see para 12.2:
“Power Calibration” in Chapter 12: Technician Mode).
The calibration procedure is performed for each transmit level:
•
LOW
: nominal transmit power of 250W.
•
MED
: nominal transmit power of 500W.
•
HIGH
: nominal transmit power of 700W.
•
MAX
: nominal transmit power of 1000W.
Exceeding the maximum rated power of the 1 kW (1000W) amplifier may damage the equipment,
and therefore it is highly recommended to adjust the MAX transmit power to 900W (that is, 0.5 dB
below the rated maximum).
This is a precaution that takes into consideration the accuracy of the equipment used to measure the
output power.
Note
If no equipment capable of measuring the 1 kW amplifier transmit power is
available, it is possible to use the 1 kW amplifier own display to determine the
transmit power.
Do not use this method, unless it is absolutely impossible to obtain appropriate
test equipment.
