User's Manual

SECTION 2: ANTENNA CONFIGURATION
IPM8-FCCRpt.doc Page 11
Measuring Insertion Loss
To measure Insertion Loss of an unterminated length of coax, perform the following steps:
Step 1 Connect the antenna to be tested to the appropriate Antenna Analyst.
Step 2 Turn on the Antenna Analyst and the Return Loss is displayed in dB to the left of the
VSWR curve.
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To switch from the RETL mode to VSWR mode, refer back to the previous set of
instructions.
Step 3 Divide the result by two (2).
Mobile Radio Antenna Distances
The following table lists the mobile radio antenna distances by frequency band.
TABLE 1: MOBILE ANTENNA DISTANCE MATRIX
Frequency
Band in MHz
Center
Frequency in
MHz
Antenna
Spacing for
¼ Wave Ant
(inches)
Wavelength
(inches)
Near-Field
Exclusion
Zone*
(inches)
¼ Wave
Length
(inches)
130-140 135 65.4 87.3 10.9 21.8
140-150 145 61.2 81.4 10.2 20.4
150-160 155 57.0 76.2 9.5 19.0
160-174 167 53.1 70.7 8.9 17.7
450-470 460 19.2 25.7 3.2 6.4
470-490 480 18.6 24.6 3.1 6.2
490-512 501 17.7 23.6 2.9 5.9
764-784 774 11.4 15.26 1.91 3.81
784-804 794 11.2 14.88 1.86 3.72
806-824 814 10.8 14.5 1.8 3.6
*NFEZ = Minimum Near-Field Exclusion Zone **Round antenna spacing to the nearest ⅛”