>On Thu, Feb 03, 2000 at 07:44:05PM -0600, Anthony Clay wrote: > The part I am having to think about is how to accurately measure the final > dB signal level. Do a search on 'RSSI'. Both AD and Phillips make chips that give a reasonably good log response to input level. You might also want to search on 'poor mans spectrum analyser' - the author shows how to use TV tuners as the front end of a low cost unit. His log detector is based upon a chain of cmos invertors operating in the linear region with a resistive sum of the individual outputs. As each stage saturates, it quits adding to the output. It seems reasonably accurate, is incredibly cheap, and uses parts made by many suppliers. dwayne Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 16 years of Engineering Innovation (1984 - 2000) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Do NOT send unsolicited commercial email to this email address. My posting messages to Usenet neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email.