TM 11-5820-890-10-3 ABBREVIATIONS.  Continued ABBREVIATION TERM GD good HI high HR hand receipt HUB hold up battery HZ hertz H-Ld hold-load ICM intercom ID identification IF intermediate frequency IN inch INIT initiate KEK key encryption key (COMSEC key) KG kilogram KHZ kilohertz LB pound LD load LD-V load variable L.E. late entry LO low LOS line-of-sight L lockout LR long range LR/LR long range/long range M medium MAN manual MHZ megahertz MP manpack NCS net control station NRI net radio Interface OFST offset OW "order wire" PA power amplifier PAM pamphlet PM permanent memory PMCS preventive maintenance checks and services PT plain text PTT push-to-talk PWR power RAD radio RCU remote control unit RCV receive E-3