Clear-Com Solutions  
Solution 1149 : Partyline: AC-10H is noisy
There is an RF filter capacitor from pin 1 to the audio plug housing. When the housing was changed to plastic, the cap was not moved to a chassis ground. Grounding the cap eliminates the noise.

Also check the Master starion forĀ a 10 ohms resistance when measured across Pin 1 and ground in the Master Station.

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