User's Manual

SECTION 3: INSTALLATION INSTRUCTIONS
M64450G25-FCCRpt.doc Page 15
 The previous figure represents the recommended front-to-rear antenna installation. The
receiver antenna (RX2) should be the antenna nearest to the light bar.
Step 3 All antenna mounts must be environmentally tight. Install or use O-rings to seal the
antenna base to the rooftop of the vehicle.
Step 4 Route the coaxial cables to the mobile radio through one of the hollow spaces in the
roof supports into the trunk compartment where the mobile radio is mounted.
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Both antennae should be checked and tested to ensure they are functioning properly.
a
If these installation guidelines are followed, it will be safe for persons to stand at a
distance no less than 39 inches from the antennae
while the mobile radio is in
transmit mode.
Measuring Return Loss
The following test is performed without any power, thus can be performed immediately after the
installation of the coax and antenna, following the installation of the N-type connector on the coax.
To measure Return Loss, perform the following steps:
Step 1 Select the appropriate Antenna Analysts to perform the test.
Step 2 Connect the antenna to be tested to the Antenna Analyst.
Step 3 Turn on the Antenna Analyst and the Return Loss (RETL) is displayed in dB to the
left of the Voltage Standing Wave Ratio (VSWR) curve.
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The Return Loss Specification is –14 dBm or greater (with good antennae the typical
range will be between –14 dBm and –28 dBm).
Measuring Voltage Standing Wave Ratio
To measure the Voltage Standing Wave Ratio (VSWR) Reflected Power, perform the following
steps:
Step 1 After selecting the appropriate Analyst and connecting the antenna to be tested,
press F1 to access the Analyst Menu.
Step 2 Press F1 again to access the Display (DSPLY) menu, which lists the modes.
Step 3 Press F2 to select the VSWR display mode. Plotting will resume and the VSWR
value is highlighted.
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The VSWR Reflected Power Specification should be at a ratio of approximately 1.6 to 1.