Communications were a problem; radios were not used within platoons, only rearwards. Ranges were invariably beyond the capability of manpack VHF radios (A41 and A42, copies of AN/PRC 9 and 10), although the use of relay or rebroadcast stations helped where they were tactically possible. Patrol bases could use the World War II vintage HF No 62 Set (distinguished by having its control panel labelled in English and Russian). Until the manpack A13 arrived in 1966, the only lightweight HF set was the Australian A510, which did not provide voice, only Morse code.