MFJ-269D Instruction Manual LF/HF/VHF/UHF SWR Analyzer
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5.4.2.1 Return Loss and Reflection Coefficient (UHF)
Return Loss and Reflection Coefficient is the first measurement mode in the Advanced-1 UHF menu.
To access this menu, press and hold Gate and Mode simultaneously until Advanced-1 appears (same as
LF/HF/VHF entry). The display will briefly indicate:
After a few seconds, the opening display changes to the data screen (samples below). Note that SWR
greater than 5:1 falls beyond the measurement range of the MFJ-269D in UHF mode.
The Return Loss and Reflection Coeff mode measures and displays Return Loss in dB and Voltage
Reflection Coefficient on the LCD. These terms are another way of describing SWR. The SWR meter
indicates SWR normalized to 50-Ohms, and the impedance meter is disabled. To use this mode, connect
the DUT to the Antenna connector, adjust Frequency as needed, and read the results on the screen and
SWR analog meter display.
5.4.2.2 Match Efficiency (UHF)
Match Efficiency is the second and final measurement available in the Advanced-1 UHF menu. To
access it, first enter the Advanced-1 menu, then press and release Mode one time. You can also reach it
by stepping through the other Advanced-1 modes until the screen displays Match Efficiency.
Match efficiency, yet another way of describing SWR, is similar to mismatch loss, but the data is
expressed as a Percentage of Forward Power vs. Reactive or Circulating Power in the system.
Important Note: Match efficiency may mislead those unfamiliar with SWR and energy transfer in a RF
system. See note under 5.4.1.6 for an expanded explanation.
Sample screens:
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