If I ended up doing an external TT decoder, I'd probably use the Comm Spec unit.
Joe -------------- Original message ---------------------- From: Mike Morris WA6ILQ <[EMAIL PROTECTED]> > NHRC has a DTMF control board for $90 > <http://www.nhrc.net/nhrc-remote-plus/> > however it controls 8 devices. > > A similar device is described here: > <http://www.atv-projects.com/html/dtmf_control.html> > > A garage door opener based design is here: > <http://www.electronic-circuits-diagrams.com/remotecontrolsimages/remotecontrols > ckt5.shtml> > > Ramsey has a 4-channel device for $40 here... but > I've never had good luck with Ramsey... every item > of theirs that I've built has been a little short on the > engineering. > <http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=DCI1C> > >
--- Begin Message ---
At 01:03 PM 05/26/07, you 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
NHRC has a DTMF control board for $90
<http://www.nhrc.net/nhrc- >remote-plus/
however it controls 8 devices.
A similar device is described here:
<http://www.atv-projects. >com/html/ dtmf_control. html
A garage door opener based design is here:
<http://www.electronic-circuits- >diagrams. com/remotecontro lsimages/ remotecontrolsck t5.shtml
Ramsey has a 4-channel device for $40 here... but
I've never had good luck with Ramsey... every item
of theirs that I've built has been a little short on the
engineering.
<http://www.ramseyelectronics. >com/cgi-bin/ commerce. exe?preadd= action&key= DCI1C
--- End Message ---
