User's Guide

Planning for connectorized units Chapter 2: Planning considerations
2-14
UNDER DEVELOPMENT
phn-2182_003v004 (Oct 2011)
Calculating RF cable length (5.8 GHz FCC only)
The 5.8 GHz band FCC approval for the product is based on tests with a cable loss
between the ODU and antenna of not less than 1.2 dB. If cable loss is below 1.2 dB with a
6 ft diameter external antenna, the connectorized PTP 250 may exceed the maximum
radiated spurious emissions allowed under FCC 5.8 GHz rules.
Cable loss depends mainly upon cable type and length. To meet or exceed the minimum
loss of 1.2 dB, use cables of the type and length specified in Table 2-7 (source:
Times
Microwave). This data excludes connector losses.
Table 2-7 RF cable lengths required to achieve 1.2 dB loss at 5.8 GHz
RF cable type Minimum cable length
LMR100 0.6 m (1.9 ft)
LMR200 1.4 m (4.6 ft)
LMR300 2.2 m (7.3 ft)
LMR400 3.4 m (11.1 ft)
LMR600 5.0 m (16.5 ft)