Specifications - MFJ 1789 Instruction Manual

MFJ-1789 Rotatable Mini-Dipole
MFJ-1789 9-Band Rotatable Mini-Dipole
Introduction
The MFJ-1789 is a mini 18-foot rotatable dipole that is almost invisible from across the street. With its
tiny 9-foot turning radius, it fits on the smallest roof and is perfect for town houses, apartments and
condos. If necessary, it can even be mounted inside an attic!
The MFJ-1789 is inconspicuous and low profile -- not much bigger than a TV antenna, and can easily be
turned by a lightweight TV rotator such as the Hy-Gain AR-35.
And this antenna is no wimp! Its bi-directional pattern can help reduce QRM/noise while maximizing
your signal in the directions that you want -- so you can work some real DX. You can operate 9 bands --
40,30, 20,17, 15,12,10, 6 and 2 meters -- and run up to a full 1500 Watts SSB on all HF bands.
The MFJ-1789 features automatic band switching, and uses highly efficient end-loading with its entire
length always radiating. With 6 and 2 Meters thrown-in, you have ham radio's most versatile rotatable
dipole!
Each HF band uses separate, efficient end-loading coils wound on fiberglass forms with Teflon
and capacitance hats (no lossy traps). 6 and 2 meters are full-length half-wave dipoles.
The MFJ-1789 is built-to-last – using an incredibly strong, solid fiberglass rod center insulator and 6063
T-6 aircraft strength aluminum tubing for the radiator. And it assembles in an afternoon.
WARNING: Improper installation and assembly can be hazardous!
thoroughly before attempting to assemble, install or operate this product! High power transmitting
devices produce voltages that can cause severe burns or other injuries.

SPECIFICATIONS

The small size of the MFJ-1789 is accomplished by adding separate loading coils and capacitance hats at
each end of the antenna for the HF bands. The efficient end-loading coils are wound on fiberglass forms.
The six and two meter amateur bands are covered with the addition of four quarter-wave decoupling
stubs.
Electrical Specifications
Band CW
40m 1500 1500
30M 1500 1500
20m 1500 1500
17m 1500 1500
15m 1500 1500
12M 1500 1500
10m 1500 1500
Power
SSB 2:1 SWR BW
40 KHZ
50 KHZ
60 KHZ
200KHZ
400 KHZ
800 KHZ
1.2 MHZ
3
Instruction Manual
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