Spectra Engineering MX800 - Module Level Test Procedures (continued); Receiver Module Test Equipment; Receiver Module Preliminaries

MX800 Transceiver Technical Manual
© SPECTRA ENGINEERING 2006 Revision 4.2.3
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16. Select lowest channel. Assert PTT, check that LD goes high and check
that the VCO tuning volts on SKD-14 is > 2V. Select highest channel.
Assert PTT, check that LD goes high and check that the VCO tuning
volts on SKD-14 is <18V. Check that RF output is >300mW in both
cases.
17. Select mid channel. Assert PTT, note RF output carrier frequency and
check that by adjusting the Reference Oscillator Frequency
digipotentiometer slider on the MXTOOLS channel screen that the
carrier frequency can be adjusted + and - 3ppm of the nominal frequency.
18. Select mid channel. Assert PTT carry out 5.1.9 of the TX VF alignment
procedure to check the function of the VCO and Reference oscillator
modulation inputs.
5.2.2 Receiver Module
Test Equipment:
Tested MX800 with Receiver removed
Tested RX VCO board (in wanted band)
PC with MXTOOLS software
RF Communications test set
Spectrum analyser with tracking generator
Multimeter
High frequency (89.545MHz) pick up loop.
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 Receiver module under test and fit known working
VCO tuned for the band to be tested
Connect Receiver to working Micro Controller via 16-way ribbon cable.