On Wed, Sep 19, 2012 at 1:31 AM, RussellMc wrote: > Peripheral onlY: > > RF links largely exist from what you say. > If you are adding any new ones they may need to conform to an existing > statndard. > If not, consider the transmission of digitised audio rather than > analog. Probably no more $ costly if worked at. Data is then in a form > that it can be manipulated as is with digitising having been done at > source and not on a per receiver basis. Digital "just works" or "just > doesn't" more or less - and with error detection and./or correction > you can decide behaviour in marginal conditions. AM fades nicely in > marginal situations (eg try an AM portable phone - inserting head in > 'beam' can make a difference). FM not so bad. > Many lecturers use their own audio equipment. Although it's usually simple analog radio equipment, it has always worked and worked perfectly. This device absolutely must be compatible with existing hardware and shouldn't disrupt the current workflow. It shouldn't force anyone to change their equipment. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .