FM880 DTMF decoder
As used in VK6RAP (2M) and original VK6RLM
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The early FM880s (VK6RAP & VK6RLM) which used the VK6CU control board required a separate DTMF board for remote control of the repeater, as the VK6CU control board did not contain a DTMF decoder and remote repeater function control.