A dtmf decoder on a simple receiver would fit the bill. The Hamtronic DTMF Decoder board has latching and pulsed output logic. It's a great dollar value and a good learning tool/kit to assemble.
Otherwise Intuitive circuits makes a dtmf controller. http://www.icircuits.com/prod_dtmf_main.html skipp > [EMAIL PROTECTED] wrote: > Hello to All, > > I am starting to develop a future ham repeater relation with a tower site(s) owner and recently got a request for something unusual. The company has a fleet of VHF radio equipped vehicles. They want to pull up to a site, enter a touch-tone sequence on the mike, and open a security gate at the site. I could kludge together something, but would rather find something commercially available. Anytime I have kludged something together, I have ended up having to repair it for longer that I expected. Something with a VHF receiver, TT decode and relay contact output would be great. > > Any ides if this is even made commercially? I know that some fire/ambulance departments use a similar idea to open and close the firehouse door. Some also have the ability to control traffic control lights on their way to a situation. > > 73, Joe, k1ike >
