Hi All, sometime I saw info/circuit for using Heil HC-4 & 5's with the K2. Unlike my MH-2 hand mic, there is inadequate O/P from my HC-4 Pro Micro Headset to drive the VOX circuitry ( Have to really SHOUT ! ). Sods law, now can't find the info. Can someone please send me a link. Many thanks - Steve/G4MJW K2 # 2408