User's Manual
001-2019-500 Rev 0 Paragon4 – UHF, 700 & 800MHz User Manual
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7. Troubleshooting and Testing
The checks described below should be done at time of installation, annual intervals, or whenever deteri-
oration in performance is noted. These checks are to be done by a CalAmp field service employee, a pro-
fessional installer, or an accredited radio shop technician.
7.1 Equipment Required
• In-line RF power meter in the 0.5W range for the 150 mW exciter module power output*.
Consider wattmeter in the -15W range for the reflected power and in the -50W range for the
forward power of the power amplifier.
*Note: The Crescend PA requires an input power level ranging from 100 to 200mW. The ex-
citer module is therefore adjusted at the factory for 150mW typical.
• Radio service monitor (IFR-120B with option 03: 30 kHz IF filter or equivalent).
• Short RG-223 cable (<2ft) with N-Type male connector to connect the exciter module to the
service monitor if necessary. Short RG-214 cable (<1 foot) with N-Type male connector to
connect the power amplifier module to the service monitor if necessary.
• RF load 50Ω 150W.
Important note: Before proceeding make sure that the service monitor has been calibrated re-
cently and has warmed up for at least the time specified by its manufacturer.
Some reported frequency and deviation problems have actually been erroneous indications from
service monitors that have not adequately warmed up. This is particularly likely when field ser-
vice is done during winter months
.
7.2 Recommended Checks
A) After an installation
1. Power-up LED Sequence
2. Transmit power output
3. Reflected power output
4. RF Link test between Paragon4 unit and mobile unit(s) (PING from a PC as per para-
graph 7.4.1)
B) For annual maintenance & trouble-shooting
Same checks as A) plus:
5. Carrier frequency error
6. TX Deviation
7. 12dB SINAD
8. Receiver distortion
9. Main RX and Aux. RX RSSI
10. Verify power supply connections & terminals torque settings (see paragraph 4.4.2.2)
Preliminary