MFJ MFJ-1890, Instruction Manual

3

Permanent Installation

The ideal installation is a rigid pole or roof mount that puts the antenna completely
in the clear.  If the ideal installation is not possible,  choose the best compromise.
TV mast, heavy-duty rigid electrical conduit, and steel water pipes are suitable 
mast materials.  The use of soft or thin wall mast is not recommended. 

Portable Operation

The MFJ-1890 may be easily transported to temporary locations for portable, 
emergency, and contest operation.  Even for temporary or portable operation, do not
be casual about selecting a suitable mast.  If the antenna falls, it can be damaged and
may cause serious injury.  Whatever type of installation you choose, remember that
the antenna should be installed where it cannot be contacted by people or animals or 
come in contact with power lines.

Antenna Assembly

Assemble the antenna on a flat level surface.  Avoid assembly over grass as you may 
drop some of the parts and never find them again.   You may use a couple of saw horses 
or other means of support to aid assembly.  Loosely assemble the #1 and #11 brackets
using the 1/4-20 nuts, bolts and washers as shown in figure 1.   Don't forget the square 
nuts that go inside the brackets.   The square nuts are different for each bracket and also
take different bolts.

Figure 1

24

14

22

25

16

24

19

This hole should be 3 inches 
from the end of the boom