MFJ-9201 QRPocket Antenna Tuner Instruction
Manual
4
Special Note: Always use the minimum amount of inductance as possible.
Minimum inductance gives the best efficiency, maximum power
handling, and widest bandwidth.
The MFJ-9201 covers 80 through 10 meters.
Do not operate on 160 meters.
Tuning Procedure:
1. Position the
TRANSMITTER
control to 5 on the corresponding scale.
2. Position the
ANTENNA
control to 0 on the corresponding scale.
3. Place the
BYPASS/TUNE
switch in the
TUNE
position.
4. Apply just enough power to obtain noticeable deflection on your reflected
power meter or SWR meter.
5. Adjust the
INDUCTOR
control for lowest deflection on the reflected power.
6. Carefully adjust the
TRANSMITTER
control for the lowest reflected
power, then increase the
ANTENNA
control slightly and adjust the
TRANSMITTER
control for the lowest reflected power. Again, increase
the
ANTENNA
control slightly and adjust the
TRANSMITTER
control for
lowest reflected power. Repeat this process for lowest reflected power.
Note: These controls interact. Go back and forth between these adjustments
as many times as required until the lowest reflected power (best SWR)
is obtained.
7. After the lowest reflected power (or SWR) is obtained in step 6, use the
INDUCTOR
switch to reduce the inductance one switch position (L is the
lowest inductance setting). Adjust the
TRANSMITTER
and
ANTENNA
controls for the lowest SWR. Continue this process until the lowest SWR
cannot be repeated, then use the
INDUCTOR
switch to increase the
inductance by one switch position (A is the highest inductance setting).
Tune for lowest SWR.
WARNING: Never transmit while changing the INDUCTOR switch.
Note: Always use as little inductance as possible. Step 7 minimizes the
inductance and maximizes the capacitance.
8. After a low SWR is obtained, the transmitter power may be increased to any
value up to 100 watts.
WARNING: Do not exceed 100 watts output. You will damage
the tuner!
