Reduced Price New 30/300W VHF/UHF SWR/Wattmeter, 144/220/440 MHz Expand

MFJ 30/300W VHF/UHF SWR/Wattmeter, 144/220/440 MHz

MFJ Enterprises, Inc.

MFJ-862 by MFJ Enterprises, Inc.


The MFJ-862 VHF/UHF 144/220/440 SWR/Wattmeter measures forward and reflected power and indicates SWR for the 144, 220, and 440 MHz ham bands.

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  • Two power scales for each band selected with the front panel rotary switch.
  • The low power scale reads from 0-30 watts forward and 0-6 watts reflected.
  • The high power reads from 0-300 watts forward and 0-60 watts reflected.
  • SWR is indicated from 1:1 to 5:1.


  1. The MFJ-862 senses RF energy traveling along a 50Ω stripline
  2. A forward and reflected stripline couple to the 50Ω stripline to make a directional coupler
  3. A voltage is produced in the forward and reflected striplines that is proportional to the current and voltage traveling along the 50Ω stripline
  4. This signal is rectified by a diode and smoothed by a capacitor
  5. Because the directional coupler's sensitivity increases with frequency, trimpots are used to adjust for different frequency and power settings (high or low power)

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