User's Manual

COMTRAC RADIO

USER MAUAL

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DTC

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9950-15900

3CU 04036 0026 PCZZA

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12.1.1 Access Point Power Setting

When installing the WRU radio, the power level must be set in order to not exceed the

maximum output power and/or EIRP requirements for the region of deployment, which is

measured at the antenna output.

In the four antenna system, the antennas closer to the WRU will have a slightly higher

output signal level if there is less cabling (less link loss). The use of an attenuator (or

pad) should be used to balance the antenna system. The value of the pad is determined

by the difference in the link budge (link loss) between the two antenna systems.

For FCC compliance of Point-to-Multipoint Communication;

- The maximum output power from the intentional radiator (radio) is +30 dBm (1 watt),

delivered to an antenna with a maximum gain of 6dBi. This equates to a maximum EIRP

of +36dBm (4 watts).

- If using directional antenna with a gain greater than 6 dBi, then the conducted output

power from the radio is reduced by the additional gain above 6 dBi.

Example: If using a directional antenna with a gain of 16 dBi, then the maximum power

applied to the antenna port will be +36 – 16 = +20 dBm. [or; (6-16) +30 dBm = +20dBm].

The transmitters (radio) output power can be calculated by factoring the additional loss,

and increasing this value to a maximum of +30 dBm.

Example: Using the 16 dBi gain antenna example above, and considering the losses for

one 2-way splitter of 3.5 dB (power + insertion loss), a surge suppressor of 0.5 dB

(insertion + coupling loss), and total cabling of 2 dB (cable losses), then the transmitter

output power level is +20 +3.5 +0.5 + 2 = +26 dBm.