NuPower Xtender™ VU4GX02 User Manual
Rev 1.2
8
4.4
OVER TEMPERATURE FLAG
This signal is an output to indicate an over‐temperature condition in the NuPower Xtender VU4GX02. A
logic high (+5 VDC) indicates normal operation, while a logic low (0 VDC) indicates an over‐temperature
condition. The Xtender VU4GX02 incorporates internal logic circuitry that turns off the DC bias to the RF
transistors.
Caution: The amplifier should be shut down and allowed to cool off when the over‐
temperature flag is set low to avoid damage to the module.
4.5
TRANSMIT/RECEIVE (T/R) ENABLE
The Xtender transmit and receive switching is a manual control function. Applying a logic
low
(0 V or
GND) to the T/R line places the VU4GX02 in transmit mode. Likewise applying either a logic
high
(+5 V)
to the T/R line, or leaving it float (NC), places the VU4GX02 in receive mode.
