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MFJ-815C Deluxe HF True Peak Reading SWR/Wattmeter
MFJ-815C Deluxe HF True Peak Reading SWR/Wattmeter
Introduction
The MFJ-815C is a true peak reading SWR/Wattmeter designed to operate on 1.8-30
MHz. This meter uses our TrueActive
forward and reflected power and SWR simultaneously. It has 3000/300 Watts forward
and 600/60 Watts reflected power scales. The MFJ-815C utilizes a large illuminated
three-inch Cross-Needle meter to read the SWR from 1:1 to ∞.
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.
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-815C has a TrueActive
supply such as the MFJ-1312B 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-
815C.
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.
peak reading circuit to read true peak/average
peak reading circuit that requires a DC power
1
Instruction Manual
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Table of Contents
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Summary of Contents for MFJ 815C
- Page 1 2. The MFJ-815C has a TrueActive peak reading circuit that requires a DC power supply such as the MFJ-1312B 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...
- Page 2 MFJ-815C Deluxe HF True Peak Reading SWR/Wattmeter Instruction Manual Operation 1. With the DC power supply or 9 VDC battery installed, push the ON/OFF button in to turn the unit ON. If 12 VDC is used, the lamp will also be turned ON.
- Page 3 MFJ-815C Deluxe HF True Peak Reading SWR/Wattmeter Instruction Manual Calibration The MFJ-815C has been calibrated at the factory. If it should ever need to be recalibrated, then follow this procedure: Equipment Needed 1. Transmitter capable of supplying enough power to obtain ½ to full-scale reading at 14 or 21 MHz.
- Page 4 MFJ-815C Deluxe HF True Peak Reading SWR/Wattmeter Instruction Manual Meter Calibration (cont.) 8. With the 3000/300 Watts button pushed in for the 600 Watt reflected scale, Transmit 100 Watts as indicated on the reference meter. Adjust the HI REF trim pot to set the reflected power scale to 100 Watts.
- Page 5 You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road, Starkville, MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to techinfo@mfjenterprises.com.
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