rt138The ANPRC-138 (V)2 (RT-1694) is a HF-SSBVHF FM manpack transceiver that covers the 1. 6-60 MHz spectrum in 10 Hz steps, with up to 100 preprogrammable simplex or half-duplexSee the RT-138 Maintenance Manual, Section 4.2. 3.3 RT-138 Overall Performance Tests See the RT-138 Maintenance Manual for wide band tests. All narrow band tests are performed with