MFJ 815C Manuals
1 pdf manual(s) MFJ 815C for free download (Document Types: Instruction manual)
MFJ 815C Instruction manual [PDF] (5 pages)
- Identifier: id-1144953
- Brand: MFJ
- Device: 815C Measuring Instruments
- Type: PDF
- Key Aspects: Common Issue Diagnostic Flows, Performance Optimization Tips, Periodic Inspection Checklists
- UPD Date: 12.04.2026
- Source File: 1013426.pdf
- Pages: 5
- Description: Operation and maintenance manual for the MFJ 815C.
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MFJ-815C Deluxe HF True Peak Reading SWR/Wattmeter Instruction Manual 1 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 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-815C 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-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 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. 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.
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