MFJ-941EK Tuner Kit Instruction Manual
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TESTING
Balanced Line Check:
This test confirms the 4:1 balun is working properly.
[ ] Install a short jumper from Wire to the Balanced Line terminal post above it.
[ ] Connect a 40-W incandescent bulb across the two Balanced Line terminals.
[ ] Confirm the transceiver is connected to Transmitter.
[ ] Confirm Antenna Selector is on Tuned, Bal Line Wire.
[ ] Set Inductor to "J". Set Transmitter and Antenna to "0"
[ ] Apply 25W. Adjust Transmitter and Antenna for minimum SWR.
The bulb should illuminate. Remember to remove the jumper when disconnecting
the bulb.
Installing Cover:
If all of the above tests were completed successfully, install the chassis cover, as
outlined below. If not, consult "In Case of Difficulty" for trouble-shooting
guidance.
[ ] Position the cover with the top screw holes toward the front of the chassis.
[ ] Find eight (8) 3/8" x 6-32 black sheet metal screws and install.
In Case of Difficulty:
As noted in the introduction, the MFJ-941E is really four station accessories in
one package. If difficulty arises during testing, the problem can likely be isolated
to one of them.
1. Antenna Switching: Recheck buss-wire solder connections at the various
destinations. Also, check the swiching action of SW4 and confirm that the shaft
coupler is tight. If loose, the selector knob will read incorrectly. If no obvious
faults are located, it may be necessary to disconnect the shaft assembly for
SW4, disconnect buss leads, and lift the pc board to recheck solder-side
connections.
2. SWR/Power Meter: Recheck component placement on the pc board and
confirm correct values are installed. Also, confirm diode polarity (cathode bands
toward the D1 and D2 legend). Check meter-lead connections and polarity
markings. If the meter lamp or the range pushbutton switches are not working
properly, it may be necessary to disconnect the SW4 shaft assembly, disconnect
buss leads, and lift the board to recheck solder-side connections.
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