MFJ MFJ-841 User Manual

MFJ-841 SWR/POWER METER

Thank you for purchasing the MFJ-841 SWR/POWER METER. The MFJ-841
is designed for 2 meter handheld radios with a maximum power rating of 5
watts. The MFJ-841 uses your own antenna and plugs right between it and
your handheld radio.

USING the MFJ-841

The MFJ-841 is used only with hand held 2 meter radios wit h a maximum
rating of 5 watts. Do not attempt to use it for higher power ratings.
USING THE WATTMETER---The wattmeter is used by simply connecting the MFJ-841
between your Handheld 2 meter radio and antenna, switching to the PWR setting
and keying up. Simply read the wattmeter. If by some reason the wattmeter is
out of calibration, simply insert a known power source (2 meter only) and
key up. Set the trimpot on the side (no need to open the case.) for the know
power input.
USING THE SWR METER-------Th e S W R me t e r i s u s e d by f i r s t s e t ti n g t h e s w i t ch t o
SEN (sensitivity), keying up and adjusting the meter for maximum needle
deflection. Key down and set the switch for SWR. Key up and read the SWR.

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MFJ-841 SWR/WATTMETER SCHEMATIC