MFJ-868B Giant True Peak Reading SWR/Wattmeter 1.8-60 MHz
Instruction 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 by an external 12 VDC supply (negative ground only) or an
internal nine-volt “transistor radio” battery.
