PBS America - frequent buzz or burp on audio

[Harry Bloomfield]

On both the current and the +1, quite regularly - few seconds to a minute, including through the ad breaks, I hear a buzz / burp noise on the audio. It doesn't seem to disrupt the video, nor does it seem like the usual digital disruption of a weak signal. More than one TV is affected. Anyone else notice it, I'm on Emley Moor xmitter.

[EDIT] yes it does sometimes affect the video too, the longer bursts.

 

[TJB]

Same here. Electric buzzing sound similar to that which can be reproduced by plugging in or disconnecting audio feed. North Birmingham, not far from Sutton Coldfield transmitter. So given two different transmitters, something common to both PBS feeds.