Dual motor falters as it adjusts the radio signals (9)

I believe the answer is:

modulator

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'it adjusts the radio signals' is the definition.
The definition suggests a singular noun which matches the answer.

'dual motor falters' is the wordplay.
'falters' indicates an anagram (I've seen 'faltering' mean this).
'dual'+'motor'='dualmotor'
'dualmotor' anagrammed gives 'MODULATOR'.

'as' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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