As someone had pointed out earlier, you also need a PIC or some other device to read the 5 parallel bits from the DTMF decoder, and decode/re-encode them into the serial stream. You can not hook an 8870 direct to a serial port. You are going to require the programmable PIC because you have to make the serial data arrive at the computer the way that EchoLink wants to see it.
You can, however, hook an 8870 to a parallel port with a quad 2-input AND chip in between. This is how the IRLP boards do it. Then there may be a piece in the API that allows you to send the DTMF decoded from your own program that reads from the paralell port. Or if you can find one of the old old motorola DTMF decoder chips, you can hook it straight to the port.... like the IRLP version 1 boards used to do. Dave Cameron - VE7LTD IRLP System Designer --- In [email protected], [EMAIL PROTECTED] wrote: > > All we want to do is be able to do the node selection and > control that would normally be done in the software > portion of echolink. So from what you are saying here I > can use the CM8870 feed audio in take the 4 data lines and > the strobe and hook them up to a serial port and I should > be able to get it to send data to echolink. > > I will take a look at that. > > Thanks, > Vern > > On Tue, 25 Mar 2008 07:11:26 -0500 (CDT) > Ron Wright <[EMAIL PROTECTED]> wrote: > > The RC-1000 uses a CM8880 which is a DTMF > >decoder/encoder. It requires a CPU type interface to > >allow reading and writing and must be set up for the > >proper mode. It is not difficult, but much more than > >what you need. > > > > The CM8870 is decoder only, easy to use and straight > >forward...4 data lines and strobe going high to indicate > >decode present. > > > > Not sure what you are wanting to do with the DTMF. For > >echolink there is interface to allow for node selection > >and some control. The Echolink board uses the 8870, but > >been a while since I looked at it. It does use the RS232 > >port for comm. > > > > 73, ron, n9ee/r > > > > > > > >>From: [EMAIL PROTECTED] > >>Date: 2008/03/24 Mon PM 04:26:07 CDT > >>To: [email protected] > >>Subject: Re: [Repeater-Builder] DTMF Decoder > > > >> > >>Wouldn't I need some software to interface this with > >>Echolink? Getting the data from the 4 lines to serial or > >>parallel shouldn't be a big deal but reading it from the > >> port and translating that to Echolink might be. > >> > >>What about being able to pick the DTMF up off of my > >>RC1000 > >>and getting that data into the PC is that possible? > >> > >>Vern > >> > >>On Mon, 24 Mar 2008 12:10:44 -0700 > >> Ken Arck <[EMAIL PROTECTED]> wrote: > >>> At 11:55 AM 3/24/2008, [EMAIL PROTECTED] wrote: > >>> > >>>>Any one know if there is a good hardware DTMF decoder out > >>>>there or plans for one that will work with Echolink? > >>>> > >>>>There are several of us who had working Echolink internal > >>>>DTMF that no longer can get them to tune up right. We are > >>>>tired of messing with it so we want to go external. > >>>> > >>>>All I have found on the internet are full echolink > >>>>controllers with DTMF built in. I want just the DTMF > >>>>decoder part. > >>> > >>> > >>> > >>> > >>> http://products.zarlink.com/product_profiles/MT8870D.htm > >>> > >>> Ken > >>> ---------------------------------------------------------- > >>> President and CTO - Arcom Communications > >>> Makers of repeater controllers and accessories. > >>> http://www.arcomcontrollers.com/ > >>> Authorized Dealers for Kenwood and Telewave and > >>> we offer complete repeater packages! > >>> AH6LE/R - IRLP Node 3000 > >>> http://www.irlp.net > >>> "We don't just make 'em. We use 'em!" > >>> > >> > >> > > > > > > Ron Wright, N9EE > > 727-376-6575 > > MICRO COMPUTER CONCEPTS > > Owner 146.64 repeater Tampa Bay, FL > > No tone, all are welcome. > > > > >
