MFJ MFJ-989B Owners Manual
MFJ VERSA TUNER V
MODEL MFJ-989 B
OWNER'S MANUAL
CAUTION: Read All Instructions Before Operating Equipment.
MFJ ENTERPRISES, INC.
P. O. BOX 494, MISSISSIPPI STATE, MS. 3976", USA
MFJ-989B
The MFJ-989B Versa
amateur transmitting installations upto 3KW PEP.
is designed to match most antenna systems from 1
MHz. This tuner has a built in 50 ohm, 300W
easily tune up of your exciter. The MFJ-989B also has a
cross needle SWR/Wattmeter to allow you easy tune up and
power measurement.
The cross needle meter is easy to use. To read FORWARD
power, set the POWER switch to Hi or Lo then read the power
level on the forward scale. Maximum power reading on the
Hi scale is 2KW and Maximum power reading for the Lo scale
is 200W.
power scale. SWR is indicated by the SWR line where the
two needles crossed. No SWR sensitivity adjustment is
needed to read SWR.
Meter lamp can be power by a 12Vdc source. Use a 2.5 mm
plug with the tip of the plug connected to the positive.
Meter lamp switch will activited the meter lamp.
Reflected power can be read from the reflected
Tuner V is
SWR/WATTMETER
designed for use in high power
dummy load for
INSTRUCTION
The tuner
.
8 to 30
ANTENNA SELECTOR
The ANTENNA SELECTOR allows you to select 2 coax fed
antennas either direct or through the tuner, a 50 ohm
dummy load, and a wire or balanced line antenna.
INSTALLATION
1.
Locate the tuner in a convenient location at the
operating position.
NOT ACCESSABLE DURING OPERATION. If random wire or balanced
line operation is used the ceramic feed through insulators
will have high RF voltages which can cause serious RF burns
if touched when transmitting.
2.
Install the tuner between the transmitter and the
antenna as shown in the diagram below. Use coax cable such
as RG-8/U to connect the transmitter to the connector marked
TRANSMITTER on the rear of the tuner.
3.
Connect the antenna(s) to the tuner as follows:
A.
coax cable feed lines to the coax connectors 1 and 2 coax lines may be fed direct or through the tuner as
selected by the ANTENNA SELECTOR switch.
B.
Wire antenna is connected to the WIRE terminal.
C.
Balanced line is connected to the BALANCED LINE terminal and the top balanced line terminal as indicated by
the dotted Line.
NOTE: LOCATE THE TUNER SO THE REAR IS
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