User Manual

5.1.8. TX Power Setup
The transmitter power setup is used to set the correct power for each channel. This can
be done on a per channel basis or all channels can be set at once. Power setup is done
using the Channel Screen in MXTOOLS. To complete this test the transmitter output
needs to be connected to a power meter.
To set all channels at once select the 'Lock Data' option on the Channel Screen. Click On
the alignment channel to bring up the Channel Edit Screen and allow editing of the
channel parameters,
Note.' If the 'Lock Data' option is selected then any changes made
to the current channel are duplicated on all channels.
Select the 'Continuous Update' option on the Channel Edit Screen. This allows real time
updating of the potentiometer values to the radio. Thus any changes made will be
immediately reflected in the radio. Alter the Transmit Power potentiometer until the
power meter reads the required output power. Choose 'OK' to accept the changes made
and then from the Channel Screen choose 'Send Data to MX800'. This then saves the
changes that you have made to the radio.
To calibrate each channel individually make sure the 'Lock Data' option is not selected
and repeat the above procedure for each channel.
5.1.9. Peak Deviation and Modulation Balance Alignment
This procedure is used to set the peak deviation and modulation balance for each channel.
This can be done on a per channel basis or all channels can be set at once. The alignment
done using the Channel Screen in MXTOOLS. To carry out this procedure the
demodulated output of the transmitter output needs to be connected to a CRO or some
other piece of equipment giving a visual display of the demodulated output. IF Bandwidth
of the RF test set should be set at 20kHz or greater (230kHz on the HP 8920) and
deemphasis should be off. The audio filters should be set at <20Hz HPF and 15kHz LPF.
To alter all channels at once use the 'Lock Data' option as described in the power setup
procedure. The correct peak deviation is dependent on whether the radio is narrow,
medium or wide band and also whether the CTCSS option is installed. The following
table specifies the peak deviation in each case.