MFJ VERSA TUNER II - General Information and Features; Cross Needle SWR;Wattmeter; Antenna Selector

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MFJ-941E VERSA TUNER .ll INSTRUCTION S
GENERAL INFORMATION
The MFJ - 941E is designed to match virtually any transmitter
t o almost any antenna, including dipoles, inverted-vees,
verticals, mobile whip s , beams, random wires , and othe r s fed
by coax line s, balanced lines, or a single wire. A 4:1
balun is built-in fo r connection to ba l anced lines. An
antenna-selector sw it ch provides versatile an te nna
selection . The MFJ - 941E wi ll handle up to 300 watts of RF
output power f r om the transmitter f r om 160 th rough 10
me ter s. The MFJ - 941E employs a c r oss -nee dle meter so
forward power, re f le cted power and SWR may be read
simulta ne ous ly.
CROSS NEEDLE SWR / WATT METER
The meter on the MFJ-941E may be used with the tuner or by
itse lf. To use the meter without the tune r, set the ANTENNA
SELECTOR to COAX 1 DIRECT or COAX 2 DIRECT . Th e MFJ - 941E
utilizes a cr oss-need l e mete r FORWARD power, REFLECTED power
and SWR may be re ad simultaneous l y in two r anges . To read
FORWARD power, set the power range sw it ch t o HI(300 watts)
or L0(30 watts). Next r ead the power level on the FOR WARD
SCALE. REFLECTED power is shown at the same time on the
REFLECTED POWER SCALE . SWR is r ead by obse rv ing where the
two needles cr oss . No SWR se n sitivity adjustment is needed
to rea d SWR . Read the power level off of both scal es . The
HI ran ge is 300 wa tts FORWARD and 60 watts REFLECTED . The
LO r an ge is 30 watts FORWARD and 6 w atts REFLECTED . The
difference between the HI and LO sca l es r eadings is a factor
of 10.
The
mete r lamp can be powe re d by a 1 2V DC sou r ce, such as
the optional MFJ - 1312 power supply. Use a 2.5mm pl ug with
t he t ip of the p lu g co nn ected to the positive. The METER
LAMP ON/OFF switch will activa t e the meter l amp.
ANTENNA SELEC TOR
The ANTENNA SELECTOR switch a ll ows selecting two coax
antennas eithe r directly or through the tuner, a balanced-
line antenna, a wire antenna . An external 50 ohm dummy load
ca n be co nne cted t o the EXT . LOAD co n necto r located at the
rear of the tune r . Do not co ntinuously key into the dummy
load for more than 2 minutes at a time. CAUTION: DO NOT
OPERATE THE ANTENNA SE L ECTOR SWITCH WHILE TRANSMITTI NG.
Never
use the MFJ -948 for~ JOO watt s of RF output power,
~ in the DIRECT or DUMMY LOAD positions.
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