trouble-shooting a BPT audio intercom

Hi, I thought I would bring this thread to a close by saying:

1) I bought a new HA200 unit and fitted it this weekend. Initially there was a problem with some very loud audio feedback, which was brought under control by reducing the potentiometer for "receiver volume control", but now it is working perfectly.

and

2) thanks again to sparkmarka, for effectively pointing out what to do for this problem.
 
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