Instruction manual

MFJ-945D Instruction Manual
5
4.
Carefully adjust the "TRANSMITTER" and "ANTENNA" MATCHING controls for the
lowest reflected power.
NOTE
: These controls interact. Adjust the TRANSMITTER control for minimum, then adjust
the ANTENNA control for minimum SWR. Go back and forth between these
adjustments as many times as required until the lowest reflected power (best SWR) is
obtained.
Tuning Chart
Frequency
MHz
Transmitter Inductor Antenna
1.8 4-1/2 A 4-1/2
1.8 1 B 1
2.0 5-1/2 A 5-1/2
2.0 3 B 3
3.5 9 B 9
3.5 6 C 6
3.5 4 D 4
3.75 7 C 7
3.75 5 D 5
3.75 3 E 3
4.0 7 C 7
4.0 6 D 6
4.0 4 E 4
7.15 8 F 8
7.15 6 G 6
10.1 9 G 9
10.1 8 H 8
14.2 9-1/2 H 9-1/2
18.1 9-1/2 I 9-1/2
18.1 8-1/2 J 8-1/2
21.2 9-1/2 J 9-1/2
21.2 7 K 7
24.9 9 K 9
28.5 9-1/2 K 9-1/2
5.
If a perfect or very low SWR can not be obtained, stop transmitting. Increase the
INDUCTOR SELECTOR control (higher letter) and decrease the capacitance (lower
number). Try the row of chart settings just above the last one tried. Repeat from Step 3.
NOTE:
If an SWR of 1:1 can not be obtained, move the switch towards the end of the alphabet
one position at a time. Repeat Steps 3 and 4 for each new INDUCTOR switch
position. Always use the highest alphabetical setting possible.