- Headset HEIL BM-10 / HC4 - 2008.07.13 First i used the headset with my Kenwood TS-830,- used 'direct' hoockup (No capacitor used) - Now i'm using the headset with my ICOM IC-756proIII Heil BM-10 Made this 'converter' Y-Cable to connect the BM-10/HC4 to my ic-756pro3 tranceiver. Added a 1uF capacitor in series with the mickrophone element to block the DC-Supply provided on the tranceiver mick connector pin-1. Converter cable for the IC-756proIII with 1uF capacitor In the IC-756pro3 tranceiver manual page 18 Text read: 'NOTE: DC voltage is applied to pin 1 for microphone operation. Take care when using a non-Icom microphone' IC-756pro3 Mickrophone connector pinout Foot Switch Go Back! ©1999-2006 SM2YER Goran