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Chapter 3: System planning
Note
Under Industry Canada regulations, this radio transmitter may only operate using an
antenna of a type and maximum (or lesser) gain approved for the transmitter by
Industry Canada. To reduce potential radio interference to other users, the antenna
type and its gain should be so chosen that the equivalent isotropically radiated power
(EIRP) is not more than that necessary for successful communication.
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut
fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé
pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage
radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et
son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse
pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
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 1.3 m (6 ft) diameter
external antenna, the connectorized PTP 650 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
data excludes connector losses.
Table 31 RF cable lengths required to achieve 1.2 dB loss at 5.8 GHz
RF cable type
LMR100
LMR200
LMR300
LMR400
LMR600
Minimum cable length
0.6 m (1.9 ft)
1.4 m (4.6 ft)
2.2 m (7.3 ft)
3.4 m (11.1 ft)
5.0 m (16.5 ft)
Page
Planning for connectorized units
Table 31
(source: Times Microwave). This
3-26
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