User's Manual

RF Characteristics
A DIVISION OF TRIMBLE
34 Hardware Overview
RF Characteristics
RF Output Power
The output power is may be configured to a separate value for read and write operations
(for many tags, more power is required to write to read). The range of values is from 0
dBm to +27 dBm, in 0.01 dB increments. (For example, 27 dBm will be configured as
“2700” in units of centi-dBm.) The modules are calibrated when they are manufactured in
0.5 dB increments and linear interpolation is used to set values with greater granularity
than this.
The granularity of the RF output power setting should not be confused with its accuracy.
The accuracy of the output level is specified to be +/- 1 dBm for each regional setting.
Additional variation may be experienced if the DC input Voltage and temperature changes
while the module is operational.
This chart shows the typical transmit output variation over frequency. The typical variation
is less than +/-0.5 dBm for all transmit levels, across the entire frequency band.
DC Input Voltage also affects the transmit output level accuracy. The typical variation is
less than +/- 0.20 dBm except at high output levels for low DC input voltages, as has been