The AIR portable receiver receives the air tratfic contol frequencies, 108-136 MHz, 26 well as standard FM and AM broad casts. With type 1 and 2 models, PSB, 144-174MMz, can also be received The quartz controlled PLL (Phase Locked Loop) synthesizer system uses a microcomputer to make pinpoint tuning easy. The tuned frequency is displayed digitally. Choice of direct, scan, manual or memory tuning 1 Up to 40 (type 1 and 2 models) of 30 (type 3 and 4 models) stations can be memorized so that they ean be tuned in at the press of key Air band and PSB can be received more aasily with the memory scanning, program function, priority function and delay function Squelch control to suppress noise while tuning and during Intervals between communications. The key protect function operates at the press of a key to lock the keys on the front face so they can not be operated by accident Helical antenna far high sensitivity and selectivity has BNC connector for attachment to the receiver Four different power sources: batteries, house current, rechargeable battery pack or car battery.