There are several Internet sites, including www.mods.dk, that have downloadable schematics for the ADI AR-247. I found them by doing a Google search for "ADI 247 schematic".
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Plack Sent: Monday, April 28, 2008 4:15 PM To: [email protected] Subject: RE: [Repeater-Builder] Re: ADI 247 for a link radio Robert, <snip> See if you can find a schematic for the ADI, or find another radio for which documentation is available. It will save you guessing what "the ADI is looking for..." 73, Paul, AE4KR ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of georgiaskywarn Sent: Sunday, April 27, 2008 8:19 PM To: [email protected] Subject: [Repeater-Builder] Re: ADI 247 for a link radio Ok. Put the little op-amp together via the Repeater Builder website. http://www.repeater-builder.com/rbtip/audioamp.html <http://www.repeater-builder.com/rbtip/audioamp.html> I did the one with the 15k resistor and .0047uf cap. Couldn't tell you what pot I used. Grabbed one and threw it on. Going to look thru my junk later this week and get a 10 or 50k and try it. Because the audio is still real low and REAL distorted. However...with what Ron said...made me think about what another friend of mine said. Isn't the ADI looking for something like 600ohms? (like a hand mic would be) Much different than an 8 ohm speaker. This same setup works with a TM-G707 without any matching...why shouldn't it work with the ADI? Robert --- In [email protected] <mailto:Repeater-Builder%40yahoogroups.com> , "georgiaskywarn" <[EMAIL PROTECTED]> wrote: > > Started a project at the end of LAST summer and never got finished. > Using a ADI247 as a 220mhz link radio. Blew something up in it (in > looking for cos), sent it off, got fixed, now just getting back to the > project. *I Thought* I had decent tx audio out of it into the RC210 > controller hooked to it. However now I barely get a whisper out of my > tx audio. I can hook a mic to it...no problem with the audio, works > fine. Almost sounds like an impedance mismatch. > > Ideas? > Thanks, > Robert > KD4YDC
