You could put an opto-isolator in SERIES with the LEDS, then use the isolated transistoe output to trigger your controller. Henry
--- In [email protected], mch <[EMAIL PROTECTED]> wrote: > I have one with an output, but it seems when I checked into it, it was > not suitable for the type of operation we want. I think it was some kind > of data output. This applies to the Radio Shack model, at least. > > Besides, a contact closure won't distinguish > between watches and warnings. the LEDs will. > > Joe M. > > Rich Garcia wrote: > > > > I see a lot of people talking about having to tap off at the LED. I have 2 > > R/S WX receivers here one is SAME and one is not and both have outputs, I > > have not messed with the output but I believe that it is a NO contact that > > closes upon alert and opens when the receiver goes back to mute. The only > > thing I don't like about it is that most of these radios will mute 4-5 > > minutes after the alert message, that is a bit long for my taste but you > > could use the output to fire another relay/timer that is set for lets say > > 2-3 minutes and that could command the repeater controller. > > > > Rich > > > > -----Original Message----- > > From: Al Wolfe [mailto:[EMAIL PROTECTED] > > Sent: Tuesday, June 08, 2004 11:56 AM > > To: [email protected] > > Subject: [Repeater-Builder] Re: Weather Radios > > > > Why reinvent the wheel? SAME receivers have been out for several years. > > I bought a new Midland for $25 at a hamfest about three years ago. It can be > > programmed for several SAME code counties, different alerts, etc. It works > > well at a broadcast station with 50,000 watts ERP on an FM as well as > > co-located ham repeaters on two and 440. Several megawatt (or so it seems!) > > pagers system are about a mile away. > > The voltage states on the LED indicators can be used for determining > > alerts, tests, etc. Should be useful to control an input to a repeater. > > FWIW, the EAS decoder/encoders used in broadcast facilities usually > > start at over a grand, more like $3000, for a decent one. > > Have no experience with the Rat Shack models, but it would seem that > > trying to build your own SAME decoder is a lot of work when other options > > exists, other than an academic exercise. And I can't think of a legitimate > > reason to retransmit SAME codes on amateur frequencies. > > I guess if you really need a bullet proof front end you could take the > > IF signal out of commercial receiver and insert it into a cheap SAME > > receiver's IF chain. Or you could take the discriminator audio from the > > commercial receiver into the cheap SAME receiver's detector. > > The stock whip antenna on the back of the little midland works just fine > > here, but then, the WX station is only six miles away. I think I'd try a > > yagi cut to 162 if the signal was weak. > > > > Al, K9SI > > > > Yahoo! Groups Links > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
