Technical Manual Alignment and Testing
© SPECTRA ENGINEERING 2006 Revision 4.2.3
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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 MX800 - the Exciter, Receiver, Power
Amplifier and Micro Controller. The Exciter and the Receiver have VCO
daughter boards. Receiver and Exciter VCO's are similar.
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 7.4 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 tuned for the band to be tested.
Connect Exciter to working Micro Controller via 16-way ribbon cable.
Disconnect Exciter RF drive output CN1 from PA.
13. Switch DC power on and check that the output voltage on pin 1 of IC5
is 5V +/- 0.2V and that the output voltage on pin 1 of IC3 and IC8 is 8V
+/-0.2V. Assert PTT and check that 8V is switched through to SKU-3.
14. Check reference oscillator signal on centre pin pad of CN3 is > 3Vp-p.
15. Select mid channel. Connect comms test set RF input port to CN1.
Assert PTT and check that Lock Detect (LD) on SKD-16 goes high
indicating that the loop is locked. Check that the power control volts on
SKD-4 is >10V and that the RF output on CN1 is >300mW. In the
channel screen on MXTOOLS adjust the power digipotentiometer slider
to 0 and check that the power control volts on SKD-4 goes to 0 and that
the RF power out drops to <1mW. Set digipotentiometer slider back to
mid position.
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