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-duplexDATA & SPECIFICATIONS RT-138 Issue 1, Page 11 13 Cylinder oils of excessively hh BN for the fuel sulphur can lead to excessive piston crown deposit accumulation. Piston crown deposits need to be carefully monitored