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Introduction: Thank you for purchasing the MFJ-1762 three-element six-meter Yagi.
The MFJ-1762 is a light-weight directional antenna especially designed for installation
with readily-available TV-type masts, mounts, and hardware. The driven element employs
a "no-tune" hairpin impedance matching system, and all elements are cut to exact length at
the factory. No adjustment should be needed for coverage of the 50-MHz SSB band (see
page 8 for FM-segment tuning instructions). Because of its compact size, light weight,
and unique construction, the MFJ-1762 is also a excellent choice for six-meter portable or
"rover" operation. In weak-signal DX applications, two MFJ-1762s may be stacked for
increased capture area and 3-dB additional gain. The MFJ-1762 has been computer
modeled on both ELNEC™ and YA™ to confirm design integrity, and has been thoroughly
field tested in northern climates for winter survivability.
Typical Specifications:
Boom length......................6'
Turning Radius..................5' 8"
Longest Element...............117-1/2"
Weight..............................2.5 Lbs.
Feed Impedance...............50Ω
Resonant Frequency..........50.3 MHz
1.5:1 VSWR Bandwidth...1.7 MHz
Forward Gain....................6.0 dBd (8.2 dBi)
Front-to-Rear Ratio........>18 dB measured
Maximum Power...............150 Watts
Safety Precautions: Before assembling, please read the following safety notice:
This antenna is an electrical conductor--do not handle or mount near power lines, service
entrances, or other dangerous power sources. Mount out of the reach of adults, children,
and animals. Antenna elements develop lethal voltages and may cause severe RF burns
during transmitter operation. For lightning protection, always ground your supporting
mast to two or more outdoor ground rods. Disconnect the feedline from your radio when
not in use. Do not expose pacemakers or other bio-medical equipment to strong RF
radiation. To avoid personal injury or damage to the antenna, plan all mechanical aspects
of your installation carefully. Avoid handling heavy or unwieldy masts by yourself, and
make sure a second person is available to assist you in an emergency. Never work on a
roof or climb a tower alone!
MFJ-1762 Instruction Manual
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Summary of Contents for MFJ MFJ-1762
- Page 1 No adjustment should be needed for coverage of the 50-MHz SSB band (see page 8 for FM-segment tuning instructions). Because of its compact size, light weight, and unique construction, the MFJ-1762 is also a excellent choice for six-meter portable or "rover" operation. In weak-signal DX applications, two MFJ-1762s may be stacked for increased capture area and 3-dB additional gain.
- Page 2 [ ] 1 - 1 - U-bolt mounting hardware kit (U-bolt, mast clamp, nuts) [ ] Tube of Locktite ™ If any parts are damaged or omitted, please contact MFJ at (601) 323-0549 to arrange for replacement. Tools: You'll need a selection of common household tools to construct your antenna:...
- Page 3 Construction: [ ] Begin by laying the boom on a flat surface. Find the driven-element holes and the two sets of mast-mount holes (one for vertical and one for horizontal mounting). The mast- mount holes are toward the reflector end of the antenna. Identify the director and reflector ends of the boom before starting assembly.
- Page 4 [ ] Find two (2) 59-1/4" reflector element sections and repeat the same mounting procedure at the back end of the antenna. Insulating Grommet #10 Screw #10 screw Element Element Boom Boom "L" Bracket Director, Reflector Mounting Detail Driven Element Mounting Detail [ ] Find four (4) black polyethylene insulating grommets and snap one into each driven- element mounting hole (do not confuse these holes with the U-bolt mounting holes).
- Page 5 Locktite on these connections). Note that the hairpin is installed on the bottom (or earthward) side of the boom. When installing the MFJ-1762, the hairpin should be on the ground side and your coax should drop directly below the hairpin.
- Page 6 TV-antenna installation. Be especially careful not to bend or mis-align elements when raising the mast. If you stack-mount the MFJ-1762 with other antennas, allow 5' vertical spacing between higher-frequency Yagis and 10' spacing between lower-frequency Yagis.
- Page 7 Bottom Antenna Portable Operation with the MFJ-1762: Although designed for permanent roof-top installations, your MFJ-1762 makes an ideal portable antenna. Its unique construction permits you to remove the elements in less than a minute for easy storage or travel. To prepare for transport, simply remove the six #10-32 element mounting screws and detach each element sections from the boom.
- Page 8 Tuning the MFJ-1762 for FM Sub-band Operation: The MFJ-1762 is easily retuned for operation in the FM portion of the six-meter band. To do this, simply re-cut the element sections as shown below using a hacksaw or tubing cutter. Be careful not to cut the threaded ends when shortening elements! [ ] Reflector sections, cut for 56-3/4"...
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