Replaced a non working SBA 225 bogen mod. along with si35a for a school paging system Thursday and have a problem with talk back in class rooms now. Every thing seems to be working fine,All page, class room page, time clock etc., But talkback from class rooms time out before full response is heard.I should not have touched this 25 year old system but jumped in anyway . I think the SI35A is defective but not sure.
Jacktel