MFJ MFJ-989D - Page 12

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