MFJ MFJ-1622 User manual

MFJ-1622 Instruction Manual Window Mount Antenna
1
MFJ-1622 Window Mount Antenna
Introduction
The MFJ-1622 Antenna was designed to provide portable or permanent HF communications on
40 through 10 meters and VHF on 6 and 2 meters. The universal mount design allows the user to
install the antenna in many ways. The mount will easily attach to window frames, balconies, and
railings. The MFJ-1622 works well indoors mounted to a desk or table as well.
The antenna consists of a collapsible whip, loading coil assembly, universal mount, counterpoise
wire, and choke. The operating frequency is adjusted by moving the tap on the coil. The
counterpoise wire length is adjusted for minimum SWR. The MFJ-1622 Antenna will allow the
operator to get on the air from locations where antenna size is limited.
Choosing a Mounting Position
WARNING: ALWAYS ATTACH THE SAFETY ROPE TO A STABLE SUPPORT
BEFORE ATTEMPTING TO ATTACH THE UNIVERSAL MOUNT TO A
WINDOW FRAME OR RAIL. INJURY AND DAMAGE COULD OCCUR
IF THE ANTENNA WERE TO FALL.
The design of the antenna allows it to be installed in many ways. It can be easily attached to a
window frame, window box or balcony railing. A Wooden fence is another common mounting
location.
The best performance will be obtained by placing the antenna outside, however the antenna may
be used indoors if necessary. The base plate may be attached to a table, book shelf, or other
suitable support. The counterpoise is simply placed on the floor. Some installations may require
the use of a C-clamp or vice-grips to secure the base plate. Always remember to keep the
antenna away from metal objects and out of reach to prevent injury.
WARNING: SERIOUS RF BURNS AND INJURY CAN OCCUR IF CONTACT IS
MADE WITH THE ANTENNA.
Parts List
[ ] Antenna Whip
[ ] Loading Coil Assembly
[ ] 50 feet of RG58 Coax
[ ] 35 feet of counterpoise wire
Tools Needed
[ ] #1 Flat Head Screwdriver
[ ] #2 Flat Head Screwdriver
[ ] Measuring Tape
[ ] 12mm or equivalent wrench
[ ] Mounting Bracket/Base Plate
[ ] Spacer
[ ] 2 feet of Safety Rope
[ ] _” x 3 _” bolts
[ ] _” – 24 split lock washer

MFJ-1622 Instruction Manual Window Mount Antenna
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[ ] 3 Plastic wire ties

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Assembly
[ ] 1. Remove all Parts from the packing material. Check to see that all are present using the list
on page 1.
[ ] 2. Place the _”- 24 split lock washer onto the threaded end of the whip.
[ ] 3. Screw the antenna into the coupling nut (shown in Figure 1) located on top of the coil
assembly.
[ ] 4. Secure the antenna into the coupling nut using a 12mm wrench.
[ ] 5. Uncoil the coax cable to its full length.
[ ] 6. Measure 30 feet from the antenna end of the coax and mark this point with a piece of
tape.
[ ] 7. Begin 18 inches from the antenna winding the coax in a circle, 8-10 inches in diameter,
using the 30 feet measured in the previous step.
[ ] 8. Use the three black wire ties supplied to tie the choke coils together. Space the ties out
evenly around the circle. Figure 1 shows a picture of the finished choke.
[ ] 9. Insert the _” x 3 _” bolts into the threaded holes on the base plate approximately one
inch as shown in Figure 1.
[ ] 10. Place the spacer plate onto the bolts as indicated in Figure 1.
[ ] 11. Push one end of the safety rope through the rope hole as indicated in Figure 1. Tie a knot
on both ends of the rope to secure it.
ANTENNA
COUPLING
NUT
CHOKE
TAP
LOADING COIL
SAFETY ROPE
SPACER
SCREWS
WING NUT
Figure 1

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Installation
IMPORTANT: WHILE INSTALLING THE ANTENNA TO A WINDOW OR
BALCONY CONNECT THE SAFETY ROPE OF THE BASE PLATE
TO A SUPPORT.
[ ] 1. Choose a location to mount the antenna.
WARNING: NEVER MOUNT THE ANTENNA IN A LOCATION CLOSE TO POWER
LINES. SERIOUS INJURY OR DEATH MAY OCCUR.
[ ] 2. Connect the safety rope to a good support.
[ ] 3. Attach the mounting bracket in position by placing the bracket over or around the surface
of the support.
NOTE:THE ANTENNA SHOULD BE ORIENTED AWAY FROM WINDOWS AND
OTHER OBJECTS THAT ARE WITHIN CLOSE RANGE IF POSSIBLE.
[ ] 4. Tighten the screws on the rear of the base plate against the surface of the support. The
screws should be tightened in equal increments to keep the force on the spacer plate
proportioned.
[ ] 5. Decide which mount hole will be used on the mounting bracket according to your
situation. There are five holes available. Figure 1 indicates the possible hole positions.
[ ] 6. Extend the antenna whip to its full length
[ ] 7. Remove the wing nut and lock washer from the bottom of the coil assembly.
[ ] 8. Place the coil bolt through the mounting bracket hole.
[ ] 9. Secure the antenna to the mount by replacing the lock washer and wing nut on the bolt
and tightening them firmly.
[ ] 10. Loosen the wing nut and flat washers on the Counterpoise Attachment.
[ ] 11. Insert the end of the counterpoise wire which has the insulation removed between the two
flat washers.
[ ] 12. Tighten the wing nut to secure the counterpoise.

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Frequency and SWR Adjustment
The antenna is tuned to the operating frequency by adjusting the tap on the loading coil and the
length of the counterpoise wire. The excess counterpoise wire should be wrapped in a small coil
3-4 inches in diameter. The SWR is checked using a transmitter and SWR meter but will be
much easier using an analyzer such as the MFJ-259/269 SWR Analyzer. Initial tuning will
require some time. A permanent marker can be used to place marks on the coil to reduce the
amount of time required for future tuning.
Before tuning check the following:
qCoax Connections
qCounterpoise Connections and Length
qWhip Connection and Length
qThe tap is only touching one coil turn
[ ] 1. Begin by placing the tap on turn 0 (Figure 2) which will short the entire coil. The tap
should only be in contact with one coil at a time.
Figure 2
[ ] 2. The counterpoise wire should be less than 1/4 wavelength of the desired frequency
[ 468 / frequency (MHz) ]. This length may need to be increased or decreased according
to height above ground level.
[ ] 3. With the tap on turn 0 and the counterpoise just under 8 feet, the resonance point should
be approximately 30 MHz. If this is not true lower the tap on the coil to lower the
frequency or shorten the whip to raise the frequency. Table 1 gives approximate tap
points for each of the HF bands with the counterpoise at ground level.

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[ ] 4. Each installation may require different
lengths of counterpoise wire and tap
positions. The greatest factor in
determining the counterpoise length will
be the height above ground level. The
higher the installation, the closer the
counterpoise length will need to be to a _
wavelength = 468 / frequency (MHz).
[ ] 5. Operation on the 6 and 2 meter bands
requires that the top section of the whip be
retracted completely. This may vary with
some installations. The counterpoise
length should be less than 5 feet.
Technical Assistance
If you have any problem with this unit first check the appropriate section of this manual. If the
manual does not reference your problem or your problem is not solved by reading the manual,
you may call MFJ Technical Service at 662-323-0549 or the MFJ Factory at 662-323-5869.
You will be best helped if you have your unit, manual and all information on your station handy
so you can answer any questions the technicians may ask.
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road,
Starkville, MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to
[email protected]. Send a complete description of your problem, an explanation of
exactly how you are using your unit, and a complete description of your station.
Table 1
Counterpoise Length at Ground Level
MHz
Coil #
Counterpoise
Length (Ft)
144.0
0
5’
50.1
0
5’
28.00
1.75
7’ 9”
24.89
1.5
8’ 5”
21.00
5.5
10’ 6”
18.068
5
11’
14.00
9
18’
10.1
14
19’ 5”
7.00
25
33’