MFJ-1736 Six-Meter Roll-up J-Pole Antenna
Instruction Manual
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MFJ-1736 Six-Meter Roll-up J-Pole Antenna
INTRODUCTION
The MFJ-1736 was designed for fixed or portable six-meter FM operation. Despite its
light weight and simplicity, the J-pole is a time-proven design that radiates efficiently and
exhibits low VSWR. When correctly installed, your antenna's resonant frequency should
fall around 52.5 MHz and exhibit a VSWR of less than 2:1 over most FM segments of the
band.
THEORY OF OPERATION
The MFJ-1736 consists of a 1/2-wave radiator which is voltage-fed by a matching stub.
Coax is tapped onto the stub at the correct low-impedance feedpoint to provide a 50-ohm
match. Both sides of the radiating portion are tied together to increase apparent element
diameter and improve operating bandwidth.
A special water-proof sealant has been applied to the coax braid and to all solder
connections to prevent water migration into the cable. Heat shrink has been applied to
provide more durability to the connections. The MFJ-1736 comes ready to use.
However, be sure to seal all coaxial connectors against weather and moisture in normal
fashion.
INSTALLATION
The coax cable makes it possible to connect directly to an SO-239 connector or an
extension of any length needed. The antenna may be supported over any convenient tree
limb or non-metallic structure with inexpensive nylon string. Avoid installing the MFJ-
1736 near wires, other feedlines, or large metallic surfaces that could distort the radiation
pattern or detune the element.
WARNING: Never install near power lines.
