MFJ-815D Deluxe HF True Peak Reading SWR/Wattmeter
Instruction Manual
2
MFJ-815D Deluxe HF True Peak Reading
SWR/Wattmeter
1.8-60 MHz
Introduction
The MFJ-815D is a true peak reading SWR/Wattmeter designed to operate on 1.8-60
MHz. This meter uses our
TrueActive
™
peak reading circuit to read true peak/average
forward and reflected power and SWR simultaneously. It has 3000/300 Watts forward
and 600/60 Watts reflected power scales. The MFJ-815D utilizes a large illuminated
three-inch Cross-Needle meter to read the SWR from 1:1 to
∞
.
Installation
1. Connect your transmitter to the connector on the back of the unit 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 MFJ-815D has a
TrueActive
™
peak reading circuit that requires a DC power
supply such as the MFJ-1312D in order to function. A 9 VDC may also be
installed inside the meter with a battery clip that is included. The rear panel
accepts a 2.1 mm coaxial plug with the center conductor positive (+) and the
sleeve negative (-). The negative lead is grounded inside the meter. There is no
need to disconnect the battery when using external power.
3. An internal lamp backlights the meter scale. The lamp circuit requires 12 VDC
and will not illuminate with the 9 VDC battery alone.
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-
815D.
NOTE:
The wattmeter must have a power source in order to function. A nine-volt
battery may be installed in the compartment on the rear panel, or an external
12 VDC source, such as the optional MFJ-1312D power supply, may be used.
IMPORTANT:
Please read entire manual before attempting to operate this equipment. This
unit does not provide a dc or low frequency earth ground. A separate wire
should be connected from the station ground bus to an electric ground. Do
not place any non-coaxial feed wires near metallic or RF sensitive devices.
