12
Theory of Operation
When the KXPA100 is in Operating (OPER) mode, RF is routed by the Transmit-Receive (TR) switch to the
Power Amplifier (PA) module where it is amplified by a pair of RD100HHF1 power MOSFETs.
The PA module output is routed to the Low Pass Filter (LPF) bank input. The LPF bank provides separate filters
for each frequency band. The frequency of the incoming signal is monitored and the appropriate filter is
automatically switched into the signal path.
The output of the LPF bank is routed to the RF Output via the TR Switch.
During receive or when the KXPA100 is in Standby (STBY), the TR switch routes the RF Input directly to the
RF Output, bypassing both the PA Module and the Low Pass Filter Bank.
The MCU in the Display and Control module monitors and makes critical measurements of a number of
operating conditions including two levels of fault conditions that automatically alter the operation of the
KXPA100:
1.
If an undesirable, but not critical, fault conditions occurs, a 3 dB attenuator is switched in line with the
PA input and the FAULT LED is blinked at a 1 Hz rate to alert the operator. An example of such a fault
is overdriving the KXPA100 input. When the fault is corrected, such as reducing the driving power, the
3 dB attenuator is switched out automatically and FAULT light stops blinking.
2.
If a critical fault occurs, the amplifier is automatically switched to STANDBY, passing the RF drive
directly through to the RF Output. The FAULT LED is illuminated continuously.
Summary of Contents for KXPA100
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