Tom, That solution is great when the user's DTMF pad holds the tone as long as the button is pressed. But, some radios and mobile mikes have DTMF pads that emit a very short tone burst regardless of how long the digit button is held. Lengthening the tone recognition time may prevent some users from accessing the features of the controller.
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Thomas Oliver Sent: Sunday, March 30, 2008 9:34 AM To: [email protected] Subject: Re: Re: [Repeater-Builder] False DTMF Muting On CAT-1000 Controller I once had the same problem with users' voices falsing the DTMF decoder and causing the cover tone to be activated during voice conversations, just like the original poster's problem. I contacted the controller manufacturer, Peter at NHRC I think. He told me it is a common problem with that decoder chip and to change a resistor to cause the time needed to reconize a valid digit to be longer. I don't remember the value or what resistor to change, but it took care of the problem. I did a search for a data sheet for the decoder and the controller manufacturer followed the original circuit to the letter so it wasn't their fault. It falsed when set up properly, and I took great care setting up levels with a scope, so I know the problem was not on my end. Hope this helps someone. tom <major snip>
