MFJ MFJ-868B - Installation; Operation; Power Measurement Settings

MFJ-868B Giant True Peak Reading SWR/Wattmeter 1.8-60 MHz
I
nstruction
M
2
Installation
1. Connect your transmitter to the connector labeled TRANSMITTER and your
antenna to the connector labeled ANTENNA. It is important that you use good
quality coax and properly installed connectors.
2. The meter must have a power source in order to function. Power can be
provided by an external 12 VDC supply such as the MFJ-1312D or an internal
nine-volt “transistor radio” battery. Use a 2.1 mm coaxial plug with the center
conductor positive and the sleeve ground. MFJ’s exclusive Power Saver circuit
turns the meter on only when RF power is being measured.
3. An internal lamp backlights the meter scale. The lamp requires a 12 VDC supply
such as the MFJ-1312D. Use a 2.1 mm coaxial plug with the center conductor
positive and the sleeve ground. The ON/OFF switch turns the unit and internal
lamp on or off.
4. To measure the power output capability of a transmitter/amplifier you should
connect a quality 50-ohm dummy load to the ANTENNA connector of the MFJ-
868B.
Operation
Power Measurement Settings
1. Set the SWR/PWR switch to PWR (out) for power measurement.
2. Set the REF/FWD switch to FWD (out) for forward power measurement or to
REF (in) for reflected power measurement. (REF/FWD and SWR/SET settings
share the same switch.)
3. Select peak or average reading by setting the PEAK/AVG switch to the desired
position. Set to AVG (out) to read average RF power. Set to PEAK (in) for use
with SSB and AM transmissions. In this mode, there will be a slow rise and
decay time.
Note: The meter must have a power source in order to function. Power
can be provided b
y
an external 12 VDC suppl
y
(ne
g
ative
g
round onl
y
) or an
internal nine-volt “transistor radio” battery.