9. Operation
The unit operates automatically and there are no user adjustments.
The amplifier is only intended for use with 2.4 GHz radio modems that alternate between
transmit and receive in the same radio channel. These are referred to as Time Division
Multiplex (TDD) devices. A typical example is an 802.11 WLAN card or Access Point. These
modems “ping-pong” back and forth between transmit and receive so quickly during normal
operation that both the TX and RX LEDs will appear to be lit simultaneously. In fact they are
turning on and off so quickly that they appear to be on all the time. You can tell the duty cycle
one of these LEDs by their brightness.
The amplifier will not work with radio modems or wireless bridges that are band-split true full
duplex devices.
The amplifier provides linear amplification for transmit output powers up to at least 400 mW.
This is important for Direct Sequence Spread Spectrum (DSSS) radios, especially 802.11
devices. If you drive the amp so hard as to exceed 400mW output power, the amplifier will
start to go into compression. This will result in raising the sidebands which will result in
polluting the adjacent radio channels.
For Frequency Hopping Spread Spectrum radio devices, versions of the amplifier are available
from the that have the output power limited to 250, 400 or 500 mW as specified in the FCC
certified system. These amplifiers should not be used with DSSS radios since the transmit
power limiting mechanism in the amplifier will cause it to go into compression when their
respective clamped output levels are reached.
Page 7
Page 8
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