MFJ-989D VersaTuner V
Instruction Manual
12
[ ] Readjust
Antenna
,
Inductor
, and
Transmitter
(in that order) for lowest SWR.
[ ] Repeat as needed, until
Reflected Power
falls as close to zero as you can get it.
If you weren't able to achieve zero
Reflected Power
(1:1
SWR
), try turning the
Inductor
counter-
clockwise to a lower number (adding slightly more inductance). Then, repeat the prescribed tuning
sequence (
Antenna > Inductor > Transmitter
). Try to find the
lowest front panel capacitor settings
that will allow you to obtain minimum SWR.
The chart below shows sample control settings for a MFJ-989D recorded in our lab using 50-Ohm
unbalanced and 600-Ohm balanced loads. Your optimum settings will vary somewhat, depending on the
characteristics of your particular antenna.
Frequency
(MHz)
Transmitter
Inductor Counter
Antenna
Load (
Ω
)
1.8 0.5
41
0.5
50
1.8
0
11
0
600
2.0 0.5
48
0.5
50
2.0
1
21
0
600
3.5 .5
70
2
50
3.5
5
49
0
600
3.75 1
70
2.5
50
3.75
5.5
50
0
600
4.0 2
72
3
50
4.0
6
52
3
600
7.15 0.5
80
3.5
50
7.15
7.5
69
0
600
10.1 0
79
4.5
50
10.1
8
75
0
600
14.2 3.5
73
5.5
50
