MFJ-941EK Tuner Kit Instruction Manual
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TESTING
[ ] Select Bypass, Dummy Load. Check Dummy Load connector.
[ ] Select Bypass, Bal Line Wire. Check Wire binding post.
[ ] Select Bypass Coax-1. Check Coax-1 connector.
[ ] Select Bypass Coax-2. Check Coax-2 connector.
Now, check Tune mode for continuity. Move the common VOM lead from the
Transmitter connector to the stator of the Antenna capacitor and repeat the test
procedure.
[ ] Tuned, Dummy Load
[ ] Tuned, Bal Line Wire
[ ] Tuned, Coax-1
[ ] Tuned, Coax-2
4:1 Balun DC Check:
[ ] Connect VOM leads across the Balanced Line terminals and confirm
continuity.
Power Meter Calibration:
The accuracy of your MFJ-941E SWR/wattmeter depends on the reference
standard you use for calibration. A Bird through-line wattmeter with a 100H slug
(100-W) is probably the best choice. A high-quality digital meter with certified
accuracy will also work well. Avoid using low-cost references with unknown
specifications. Also, your 50-Ohm dummy load should be capable of handling
100W without overheating and changing value.
To avoid abrupt full-scale meter excursions, pre-set the meter calibration trimpots
to the approximate settings shown below in Diagram 14:
R5
R6
R7
R8
30W FWD
300W FWD
30W REV
6W REV
Diagram 14: Trimpot adjustments
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