Specifications

HFT-1500 Digital Antenna Tuner with Roller Inductor Owner's Manual
9
METER CALIBRATION
METER CALIBRATION PEOCEDURE
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Connect the HFT-1500 as depicted in Figure 9.1.
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Connect external 50
Ω
load to COAX 1 connector and the HF amplifier to the RF
INPUT connector.
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Set the COAX 1 DIRECT position on the selector switch.
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Set the mid range the two capacitors on the RF sampler board and the four
potentiometers on the switch board.
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Select the 300 W range button and zero the two meters using a small slot screwdriver.
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Apply 100W of RF at 7.0 MHz from the receiver. By adjusting the trimmer capacitor
closest to the rear panel, null the reflected power needle.
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Reverse the connections on RF INPUT and COAX.
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Apply 100 watts of RF power at 7.0 MHz. Adjust the trimmer capacitor closest to the
front panel to null the forward power needle.
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Depress the RANGE button to select the 3000 Watt range and adjust R4 (in figure
9.2) until the reflected power reads 100 W.
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Reduce the power to 10 W, release the RANGE button and adjust R3 until the
reflected power reads 10W.