MFJ Enterprises MFJ-870 User Manual

MFJ Enterprises, Inc.
300 Industrial Park Rd
Starkville, MS 39759 USA
MFJ-870 SWR & Power Meter Instruction Manual
This SWR & Power meter is a highly accurate RF meter for measuring Forward Power,
Reflected Power, and VSWR.
Main Features:
• Large meter display for easy reading.
• Forward RF power readings, switchable to indicate either average power of Peak
Envelop Power (PEP) for SSB and AM transmitters.
• Reflected RF power readings.
• VSWR ratios.
• Illuminated meter.
• Convenient control for easy operation.
Model MFJ-870
Frequency Range 1.6 - 60 MHz
Power Range 1W to 3KW
Power Scale 30W, 300W, 3KW
Maximum Power 3KW (up to 1 minunte maximum)
Accuracy +/- 10% (AVG)
VSWR Min Power required = 3 Watt for F.S.D.
Input/Output Impedance 50 Ohms
Input/Output Connectors SO-239
Dimensions (W/H/D) in 7.5 X 4.25 X 3
Weight (lbs) 1 lb 11oz
Accessories Instruction Manual & Lead wire with DC Plug
Front Panel

MFJ Enterprises MFJ-870 Specifications

General

Type	SWR/Wattmeter
Display Type	Analog Meter
Impedance	50 Ohms
Connectors	SO-239
Weight	1.5 lbs
SWR Range	1:1 to infinity
Meter Illumination	Yes
Accuracy	±5%

Summary

Explanation of Features

Meter Display

Indicates Forward/Reflected Power in Watts and SWR ratio.

Function Switch

Selects Forward Power, Reflected Power, SWR SET, and SWR.

Range Switch

Selects RF Power Ranges of 30W, 300W, and 3KW.

SWR SET Control Knob

Sets full scale deflection when measuring SWR.

AVG/PEP Monitor

Selects Average or PEP RF Power Readings.

Meter Zero Adjust

Mechanical zero adjustment for meter needle.

TX Connector

Coax connector to transmitter 50 Ohm RF output.

ANT Connector

Coax connector to 50 Ohm antenna system.

DC Connection for Meter Illumination

13.8V DC connection for meter illumination.

Forward Power Measurement

Reflected Power Measurement

VSWR Measurement

Cautions

Full 12 Month Warranty