A pag. 8 del manuale McGregor
http://www.macgregor.co.uk/radio/PCM9XII.pdf riporto testualmente quanto si legge:
"The Data Transfer enables the contents of the current Model Memory to be transferred to another PCM9XII transmitter or to receive data from another PCM9XII transmitter. It is also used to upload or download model data to a PC, using the MacGregor DataXchange Software. A data transfer lead (
Buddy Box Lead) is required to connect the two transmitters or the transmitter and the MacGregor DataXchange."
Quindi dovrerbbe essere necessario questo cavo per connettere la radio al PC e quindi al software DataXchange, ma sinceramente non so con esattezza di cosa si tratti!