MFJ -1756 Instruction Manual

MFJ-1756 Instruction Manual
MFJ-1756 6 METER GROUND PLANE ANTENNA
INTRODUCTION
The MFJ-1756 Ground Plane Antenna features a DC grounded element and a ground
isolated radial system for improved performance.
The ground isolated radial system, unique to the MFJ-1756 antenna, reduces undesirable
feedline and supporting structure radiation by eliminating common mode current paths.
This unique system improves transmission by producing a much cleaner pattern with
more signal at desired angles, and also reduces conducted noise reaching the antenna over
the outside of the feedline or antenna support. It also insures that the length of the
feedline or support does not change the antenna's resonant frequency or SWR.
The MFJ-1756 is easily cut for the desired area of the six meter band.
impedance air insulated matching stub provides convenient adjustment of base impedance
(a normal ground plane is much less than 50 ohms) allowing adjustment to a perfect 1:1
SWR. Power capability is 1000 watts RF continuous.
CHOOSING A LOCATION FOR THE ANTENNA
WARNING: Improper
hazardous!
before attempting to assemble, install or operate
this product!
it is out of the reach of adults as well as
children. High power transmitting devices produce
voltages that can cause severe burns or other
injuries.
For the best performance on receiving and transmitting, mount this antenna in a clear
location at least a few feet above or 20 feet away from buildings, towers, feedlines, utility
wires, and other antennas. While your own ingenuity and particular circumstances will
determine the final mounting method, we will pass along some rules that can not be
neglected.
Never mount this antenna in a location that will permit unsuspecting people to come in
contact with the radials or any other part of the antenna.
Never mount this antenna where a mechanical failure might allow the antenna to contact
power lines or other utility wires.
Always ground the feed line at the point where it enters a building to a good earth ground
for lightning protection.
installation
Read these
Always mount this antenna so that
6 Meter Ground Plane Antenna
and assembly
instructions thoroughly
A rugged low
can be
1