Engine noise in uhf after fitting new dizzy cap and rotor on tb45

[mjr350]

Hi guys. Quick question. Ive now got engine noise through my UHF after fitting a new dizzy cap and rotor button. There's no noise through any other equipment like am/fm radio.
Uhf is powered through aux battery and headunit is powered by the main battery.
Is it possible that the new dizzy cap or button has increased spark and is causing issues.

[mjr350]

Edit

Ive just powered the uhf from a totally external battery and there's still engine noise as I rev the engine up.