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This port is used to measure SWR or perform other RF impedance measurements, with the exception of the Frequency Counter mode. Page 16. MFJ-259B Instruction Download MFJ 259B ANTENNA ANALYZERS SCH service manual & repair info for electronics experts. I'm not sure if any other errors were introduced in the manual rewrite. History: My amigo JB was the primary MFJ259B designer, and I helped with firmware SWR is the ratio of a load impedance to source impedance. Since nearly all feedlines and radio equipment used in amateur service are 50 ohms, this instrument isMFJ-259B Instruction ManualHF/VHF SWR Analyzer. 2. 1.0 INTRODUCTION. Attention: Read section 2.0 before attempting to use this product. Care Use and Feeding of a MFJ-259B Antenna Analyzer MFJ-259B Description Schematic Block Diagram Vz= Voltage across the load. Vr= Voltage indicating bridge pdf manual of the mfj 259b antenna analyzer in english. Listed under the Radio Equipment/Antenna Analyzers/MFJ-259B category that is about MFJ-259B Antenna