User's Manual

COMTRAC RADIO
USER MAUAL
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the both receivers).
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(s) 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 8.5 dBi, then the maximum power
applied to the antenna port will be +36 – 8.5 = +27.5 dBm.
The radio output power can be calculated by factoring the additional loss, and increasing
this value to a maximum of +30 dBm.
Example: Using the 8.5 dBi gain antenna example above, and considering the losses
for one bandpass filter of 2 dB (power + insertion loss), and total cabling of 2 dB (cable
losses), then the transmitter output power level is +27.5 +2 + 2 = +31.5  +30 dBm
max.
However, in this case where the mobile radios power level can be set higher than the
WRU, use the WRUs power level setting for the mobile to ensure a balanced RF link.
12.2.2 Antenna Diversity
Antenna diversity is used on the MRU installation and configuration only. The testing of
the installation must take this into consideration when measuring RF signals, as the
active transmit antenna port may change.
Refer to [1] for further details.