Comdel CX600 Series Manual - Página 16

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Gain

Input power

Output power

Input impedance

Output impedance

Collector voltage at full power *

Current at full power *

* 600 watts into 50 ohm resistive load

E. PA600 Power Amplifier

The PA600 uses four power transistors arranged in two pairs of push-pull Class "C" amplifiers. The input

power from the driver is matched with a wideband transformer, T1. The driver input is then split into two

signals and fed into two push-pull transformers, T2. Each of these transformers drives the bases of each pair

of power transistors, Q1-Q4. The transistors are operated common emitter with feedback.

The collector signals are coupled by a push-pull hybrid combiner, T3. The output of these combiners is once

again added together in a two-way hybrid combiner. There are no adjustments on the PA600.

Gain

Input power

Output power

Input impedance

Output impedance

Collector voltage *

Current draw *

* At 600 watt system output into 50 ohm resistive load

F. Power Monitor Board

The power monitor or directional coupler board (Figure FA0105RX) is a detector, which produces voltages

proportional to the square of both forward and reflected power. The signals from the two detectors are

produced from current and voltage taps off the output line. The forward and reflected signals are fed into the

OCB where they are linearized. They are then fed to the CX controller where they are reproduced to the

remote interface connector and displayed on the front panel. The reflected power signal is only present when

the generator is driving a load that is not purely resistive, or not 50 ohms. This signal is also used to drive the

OCB VSWR shutdown circuitry.

G. CX Controller

The CX controller is comprised of four PC boards mounted to the left side of the front panel:

1. CX INTERFACE PCB

The function of the CX Interface PCB (Figure FA0606RX) is to condition all of the analog and digital

inputs and outputs for the CX Microcontroller. This PCB board also provides the protection control

Typical Specifications

(Driver)

15 dB

1 watt (max)

20 watts

50 ohms

40 VDC

.7 A

Typical Specifications

(PA600)

15 dB

20 watts

700 watts (min)

50 ohms

37 VDC

25 ADC