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MFJ-924 440
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 t o
t h e 3 0 t h e a n d r e a d t h e p o w e r l e v e l o n t h e 3 0
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.
