User's Guide

3 . I n sta lla t ion 1 5

3 .6 .6 .2 5 .3 GHz Ba n d

I n t he 5.3 GHz U- NI I band t he peak EI RP (Effective I sotropic Radiat ed Power) is lim ited

to + 30 dBm at t he antenna for bandwidt hs above 20 MHz and is reduced for narrower

bandwidt hs in accordance with FCC part 15.407a(3) .

The inst aller is responsible during set up of t ransm it pow er t o not exceed FCC lim its on

transm ission power. These m axim um power levels are provided in Table 3- 1 for bot h

internal ant enna and external ant enna ODU configurations, along with the operational

bandwidt hs.

Note t hat though regulatory lim its are st ated in t erm s of peak power, t he syst em

transm it power levels are calibrated as averaged power readings. Average power is used

for link calculations. Therefore the levels provided in the following table is average power

levels t hat have been cert ified t o correspond w ith t he m axim um peak EI RP allowed.

3 .6 .6 .2 .1 ODU w it h I nt e r na l Ant enna

Table 3- 3 indicates t he m axim um average t ransm it power set t ing that m ay be select ed

ODU 5300 with internal (23 dBi) antenna.

The num ber of support ed channels per band ( low band or high band) is show n in t he link

configuration wizard. The greater num ber of channels support ed t he lower t he emission

bandwidt h for each channel.

For link budget , EI RP( Avg) = 23 dBi + Tx Power Setting (dBm ) .

3 .6 .6 .2 .2 ODU w ith Ext er na l Ant enna

When using ext ernal ant ennas with gains greater t han 23 dBi, the transm it power m ust

be reduced in dB from t hat given in Table 3-3 by the ant enna gain difference above 23

dBi for t he m ode that is being used.

For exam ple, using a 6 foot dish antenna with 37 dBi gain, the out put power would be

dropped by

Antenna Gain ( Ext ernal) – 23 dBi = Ant enna Gain Difference

37.6 dBi – 23 dBi = 14.6 dB

For m ode 100FE1 (single channel configuration with 30MHz em ission bandwidt h) the

power would be lowered from

Tx Power ( I nternal Ant enna) – Ant enna Gain Difference = Tx Power (External Ant )

+ 5 dBm – 14.6 dB = - 9.6 dBm ( - 10 dBm ) .

Table 3- 3 also present s transm it power set t ings for various antenna dish sizes.