Acom 04AT Operating Manual page 41

ANTENNA VOLTAGE: ...V (rms)
ANTENNA CURRENT: ...A (rms)
ANTENNA FORWARD POWER: ...W
ANTENNA REFLECTED POWER: ...W
ANTENNA SWR: ...
ATU PS VOLTAGE: ...VDC
ATU TEMPERATURE ...
ATU WORKING HOURS ...
The measurements can be performed in STBY mode or OPER mode. The operator
should manually start and stop RF power to the tuner when performing these measure-
ments.
In ATU MEASURE menu the tuner protection systems
are temporarily blocked, so the RF power limits (table 8.1)
should be monitored by the operator (S. 6.4.1 – 6.4.3).
6.4.1 VOLTAGE AND CURRENT AT THE ANTENNA OUTPUT
The antenna voltage and current are indicated in root-mean-square (rms) values.
They should not exceed:
ANTENNA VOLTAGE < 500V (rms)
ANTENNA CURRENT < 10A (rms)
6.4.2 REFLECTED POWER, FORWARD POWER AND SWR AT ANTENNA
OUTPUT
The reflected power, forward power and SWR should not exceed:
ANTENNA REFLECTED POWER < 400W
ANTENNA FORWARD POWER < 1600W
ANTENNA SWR < 10:1.
Note that at SWR>1:1 at the tuner output, the forward power will exceed the tuner
input power by the value of the reflected from the output power. Therefore, it would
be normal, e.g. at ANTENNA SWR=3:1, and input power from the amplifier 1000W,
to measure ANTENNA FORWARD POWER = 1250W and ANTENNA REFLECTED
POWER = 250W at the antenna output.
6.4.3 POWER SUPPLY VOLTAGE AND TEMPERATURE IN THE TUNER UNIT
These two values should be within the following ranges:
ATU PS VOLTAGE = 22 ... 30VDC
ATU TEMPERATURE = -40...+65
6.4.4 TUNER WORKING HOURS
This is the number of hours during which the tuner has been powered.
40 40
CAUTION
C (-40...+150
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F)
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