CC-1 XLR-x is used to HEIL PR-780/781 verwendet. These cables are available with a connector 8-pole for Foster to radio Icom, Kenwood and Yaesu. For PTT on the side next to the 6.3 mm jack equipped with a radio. The microphone connector is a 3 pin XLR.
When using the PR-781 microphone with transceivers as the FT-950, FT-2000 or FT-5000, it can happen that you have some interferences on transmit. To prevent this Heil recommends a special balanced XLR cable, CC1-transceiver-YBAL.