Motorola ASTRO XTS 5000 - TX RF (UHF R1;700-800 Mhz)

6881094C31-E November 16, 2006
Troubleshooting Charts: TX RF (UHF R1/700-800 MHz) 5-39
5.16 TX RF (UHF R1/700-800 MHz)—Page 1
TX
power OK?
Place XCVR and VOCON
into the analysis fixture.
Key up. Measure RF
power at antenna port
Ye s
No
No
Ye s
Ye s
No
No or low
TX power
Check
FGU
Frequency
OK?
No
Ye s
Check
FGU
Level
about
-3 dBm?
Check coaxial
connector and
cable assembly
Measure RF level
at driver amp
outlet, C107.
Use a spectrum analyzer
and high-impedance RF
probe. Measure TXRF
at TP11
RF level OK?
Approx. +26 dBm
No
No
Ye s
Ye s
Level about
+36 dBm?
Check
switch
Measure RF levels
at C103 and D701-
cathode. Calculate
switch loss
Measure RF level
at PA output,
C103.
Measure RF levels
at D701-cathode and
TP02. Calculate
harmonic filter loss
Loss < 1 db?
No
Ye s
Go to
VOCON TX
AUDIO flowchart
Loss < 2 db?
Remove
SH700,
repair defects
1
2
MAEPF-27475-B