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The Antenna Impedance Meter AM-1 came on the market in 1952 and was produced until 1960. It is a simple instrument that is used with the Grid Dip Meter to determin the antenna impedance and resonant frequency.
I have added an SO-259 antenna socket for improved usability.
I have calibrated the dial scale and added markings for 75 ohm and 35 ohm.