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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 

Summary of Contents for MFJ-870

Page 1: ...e 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 ...

Page 2: ... it to a 13 8V DC source FORWARD POWER MEASUREMENT 1 Set the FUNCTION switch to the FWD position 2 Set the radio transceiver to transmit and read the scale corresponding to the Power range selected 30W 300W or 3KW 3 When the AVG PEP button is out the meter reads average RF power When the AVG PEP button is depressed the meter reads Peak Envelope Power for use with SSB and AM transmissions In this m...

Page 3: ...he meter is 3KW Also observe maximumpower inputs of 30W and 300W when unsing the lower two ranges 3 The transceiver and antenna connections to the meter must never be reversed Always observe the correct connections to the transmitter and the antenna as indicated on the back panel and in this Instruction Manual 4 The meter has been carefully calibrated at the factory Tampering with any of the inter...

Page 4: ...cashiers check or money order must be provided to cover postage and handling 4 This warranty is NOT void for owners who attempt to repair defective units Technical consultation is available by calling 601 323 5869 5 This warranty does not apply to kits sold by or manufactured by MFJ Enterprises Inc 6 Wired and tested PC board products are covered by this warranty provided on the wired and tested P...

Page 5: ...12 This warranty gives you specific rights and you may also have other rights which vary from state to state ...

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