MFJ MFJ-924 Bedienungsanleitung

MFJ-924440 MHz UHF ANTENNA TUNER

Thank you for purchasing the MFJ-924 440 MHz UHF Antenna

Tuner. It will handle up to 300 watts PEP of output power. It

is designed to match a wide range of impedances for coax fed

antennas. SWR/WATT meter is built-in.

INSTALLATION

1. Connect your coax line fed antenna to the coax connector on

the MFJ-924 marked ANTENNA.

2. Connect a short coax line from the coax connector on the

MFJ-924 marked TRANSMITTER to the antenna connector of

your transceiver.

3. Connect a ground wire from the GROUND wing nut of the

MFJ-924 to the transceiver ground or earth ground of

your station.

OPERATION

SWR/WATT Meter

1. SWR Measurement:

a. Set the push button switch to SET posit/ n (TN).

b. Transmit a continuous carrier and set the SWR/POWER

control for a full scale meter deflection.

c Set the push button switch to SWR position (OUT) and

2. Power Measurement:

a. Set the push bottom switch to SET position (IN).

b. For 30 watts range -- rotate the SWR/POWER control to

the 30 the and read the power level on the 30

watt scale.

c. For 300 watts range range -- rotate the SWR/POWER

control to the 300 mark and read the power level on

the 300 scale.

Note:The SWR/POWER control on the MFJ-924 is factory

calibrated for the 30 watts range. Do not reset the

knob on this control. However, due to component

tolerance when precision reading is desired, the 300

watt range can be re-calibrated as follows:

a. Set the push button switch to SET position (IN).

b. Rotate the SWR/POWER control to the 30 mark and read

the power level on the 30 watt scale.

c. Rotate the SWR/POWER control counter-clockwise until

the power level reading on the 300 watts scale is the

same as it is on the 30 watts scale as note on Step b.

above.

d. Mark the control setting for the re-calibrated 300 watt

range.

Antenna Tuner Operation

The ANTENNA and TRANSMITTER controls on the MFJ-924 present a

minimum capacitance at "0" and a maximum capacitance at "10".

After properly installing the MFJ-924, use the tuner to tune

for minimum SWR as describe below.

1. Set both the TRANSMITTER and ANTENNA controls to "0".

2. Apply enough transmitter power to have an adequate

indication on your SWR meter. Do not apply full power while

tuning for minimum SWR.

3. While transmitting, alternately adjust the TRANSMITTER

control and the ANTENNA control for minimum SWR. Since the

TRANSMITTER and the ANTENNA controls interact, the two

controls can best be adjusted by turning the TRANSMITTER

control at a small increment at a time and then rotating

the ANTENNA control for the minimum SWR. Repeat this

process until a minimum SWR is obtained.

4. After minimum SWR is obtained, full output power up to

300 watts PEP may be applied to the MFJ-924.

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