RF Technology Eclipse Series Manual de usuario descargar pdf (Pagina 6)

RF Technology PA150

Page 6

3 ALIGNMENT PROCEDURE

RV1 is normally set so that the RFO LED comes ON at 1-3 db below the normal

power output.

2.7 Over Temperature Protection

Thermistor RT1 is mounted to the case of output transistor Q4. If the transistor

case temperature rises above 90 degrees C the resistance of RT1 increases and Q2

is turned ON.

This causes the TEMP LED to come on and also reduces the dc reference voltage

to the output power error amplifier U2d. The input power will then be reduced by

the transmitter ALC circuits and the output transistors are kept within safe

operating limits.

3 Alignment Procedure

The following procedures may be used to align the amplifier for optimum

performance.

Standard Test Conditions

RF Input Source Power Supply Load

T150 Series transmitter

25 watts maximum

13.8 Vdc at 15 A 50O 150 watts

VSWR < 1.2:1

Set RFO Level

Step Input Measure Adjust

1 None Set RV1 and R2 Fully counter

clockwise

2 Centre channel

frequency from the

T150, 25W max

threshold

RF output power at

Key transmitter

adjust RV2 for

desired output

3 As above RFO LED Key transmitter

adjust RV1 to

where the RFO

LED just goes OFF

1 2 3 4 5 6 7 8 9 10 11 ... 17 18

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RF Technology Eclipse Series Manual de usuario Pagina 6