There are two distinct tune modes with the BCC540G
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The first one is the standard initiate tune by momentarily breaking and restoring the DC supply on Pin C and then applying at least 1w of RF the tuning sequence will then complete or stop at the nearest point to a correct tune.
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The second method if used with a suitable radio e.g BCC39 is for the set to send a PWM serial control word to select one of 128 memory locations. This is what the battery is for to keep those memories active.
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If DC power is removed from the ATU then the current tune position is lost and on re-applying the DC supply then one to the above procedures is needed to activate the tune again.
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Hope this makes sense
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Regards
Dave g1jwg
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