Specifications; Overall Description; Channel Capacity - RF Technology Eclipse Series Operation And Maintenance Manual

7.1 Overall Description

Adjust the Forward Power Sense POT (R228) until
the measured output power (adjusted for the attenuator and
reflectometer losses) is equal to the Preset Forward Power.
Enter <RET> when done.
Unless something has been modified in the power sense circuits, these last three stages
should be skipped by simply hitting the Enter key three times.
This next step is necessary, and it allows the firmware to compute an offset in the output
stage drain current, so that the exciter's ability to measure the output stage drain current
is significantly more accurate.
Measure the voltage across TP102(+ve lead)
and TP103(-ve lead), and enter the value measured
This next step is also necessary, and it allows the firmware to compute an offset in the
pre-amp stage drain current, so that the exciter's ability to measure the pre-amp stage
drain current is significantly more accurate.
Measure the voltage across TP100(+ve lead)
and TP101(-ve lead), and enter the value measured
The next two stages can be skipped by simply hitting the Enter key twice.
Attach the reflectometer to an open circuit
Enter <RET> when this has been done
Adjust the Reverse Power Sense POT (R227) until
the displayed reverse power equals 50W.
Enter <RET> when this has been done.
This then completes all the calibration procedures.
7

SPECIFICATIONS

7.1 Overall Description
The transmitter is a frequency synthesized, narrow band, HF, FM unit, used to drive an
external 120 watt amplifier. All necessary control and 600 Ω line interface circuitry is
included.
7.1.1

Channel Capacity

Although most applications are single channel, it can be programmed for up to 100
channels, numbered 0-99. This is to provide the capability of programming all channels
into all of the transmitters used at a given site. Where this facility is used in conjunction
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7 SPECTFICATIONS
RF Technology T50