User's Manual Chapter 5

§ Force the mute open using the Remote Screen in MXTOOLS.
§ Inject the correct RF frequency into the receiver for the test channel.
§ Set the receiver modulation frequency to I kHz at nominal deviation.
§ Alter the amplitude of the RF signal until the RX audio has an 8dB SINAD.
§ Set the mute back to normal using the Remote Screen in MXTOOLS.
§ Adjust the mute level potentiometer, RV6, until the mute opens then wind it back until it just
closes.
5.2. Module Level Test Procedures
The following alignment and testing procedures are based upon using a working
transceiver as the test environment. It is also assumed that test fixtures to the radio are
available to exercise control lines and monitor outputs and that a PC with MXTOOLS is
connected to the radio.
There are four modules in the Mxg00 - the Exciter, Receiver, Power Amplifier and Micro
Controller. The Exciter and the Receiver have VCO daughter boards. Receiver and
Exciter VCOs are identical.
5.2.1. Exciter Module
Test Equipment:
§ Tested MX800 with Exciter removed
§ Tested TX VCO board (in wanted band)
§ PC with MXTOOLS software
§ RF Communications test set
§ Multimeter
§ Oscilloscope
§ +13.8VDC power supply
Preliminaries:
* Program upper, middle and lower frequencies of band (refer section 5.4 for band
split details) into 3 channels in MXTOOLS channel screen ( Note that 'Continuous
Update Enabled' on the MXTOOLS channel screen should be ticked for these
tests).
¯ Remove top cover from Exciter module under test and fit known working VCO