According to AOR, taken from the manual:
The model AR-22 is a 1,800 channel PLL frequency synthesized VHF FM communications receiver which covers 141.000 to 149.995 MHz or 151.000 to 159.995 MHz band in 5 kHz steps. The AR-22 design is based on the advanced PLL synthesizer technology which generates the local oscillator signal for dual-conversion receiver system with an outstanding clear signal reception. The AR-22 receiver is the equal of many full size base stations; sample measuring out at 12 dB SINAD for less then 0.2 µV for all frequencies.
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Based on historic data, today's second-hand price of the AOR AR-22 is around:
These estimates are based on the following prices: