MFJ-941E_Manual操作说明书手册

MFJ-941E Versa Tuner llMFJ VERSA TUNER IIGENERAL INFORMATION:The MFJ-941E is designed to match virtually any transmitter to any antenna,including dipoles,inverted-vees,verticals,mobile whips,beams,random wires,and others fed by coax lines,balanced lines or a single wire.An eight-position antenna-selector switch provides versatileantenna selection.The MFJ-941E will handle up to 300 Watts of transmitter RF output power.The MFJ-941E employs a cross-needle meter so forward power,reflecled power and SWR maybe read simultaneously.CROSS-NEEDLE SWR/WATTMETER:The meter on the MFJ-941E may be used alone or with the tuner.Set the ANTENNASELECTOR to COAX 1 DIRECT or COAX 2 DIRECT to use the meter without the tuner.TheMFJ-941E utilizes a cross-needle meter so FORWARD power,REFLECTED power and SWRmay be read simultaneously in two ranges.FORWARD power may be read by setting the powerrange switch to HI (300 Watts)or LO(30 Watts).Next read the power level on the FORWARDSCALE.REFLECTED power is shown simultaneously on the REFLECTED SCALE.SWR isdetermined by observing the intersection point of the two needles.No SWR sensitivity adjus tmentis needed to read SWR.The HI range is 300 Watts FORWARD and 60 Watts REFLECTED.The LO range is 30 Watts FORWARD and 6 Watts REFLECTED.The difference between the HIand LO scales readings is a factor of 10.The meter lamp can be powered by a 12 Vdc source,such as the optional MFJ-13128 powersupply.Use a 2.1mm coaxial plug with the center conductor of the plug connected to the positiveand the sleeve connecled to ground.The METER LAMP ON/OFF switch will activate the meterlamp.ANTENNA SELECTOR:The ANTENNA SELECTOR switch utilizes eight positions.They are DUMMY LOAD,BALANCELINE,COAX 1,and COAX 2 positions for both BYPASS (direct)and TUNED (through)the tuneroperation.An external 50 Ohm dummy load can be connected to the EXT LOAD connectorlocated at the rear of the tuner.Do not continuously key into the dummy load for more than 2minutes at a time.CAUTION:Never use the MFJ-941E for OVER 300 Watts of RF output power,even in theDIRECT or DUMMY LOAD positions.1