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M1225 Discriminator Audio
Posted: Mon Sep 28, 2015 7:48 am
by TARRA_Mick
Hello Group, looking for where I can tap the discriminator audio directly in a M1225. I am trying to use a pair of these radios for D-STAR and from what I have been told the audio isn't very good. Not sure if this is a receive or transmit issue. I have heard the audio on the 1 pin connector isn't really true discriminator. Still trying to find a good service manual to look. Anyone having some information that will help, I'd like to hear from you!
Re: M1225 Discriminator Audio
Posted: Mon Sep 28, 2015 12:27 pm
by escomm
Pin 1 is one half of the speaker audio
Try Pin 11
http://batboard.batlabs.com/viewtopic.php?t=75831
Re: M1225 Discriminator Audio
Posted: Mon Sep 28, 2015 1:11 pm
by TARRA_Mick
Pin 11 is can be programmed as "unmuted/flat audio". Not sure if that is really discriminator. They say the M1225 has bad audio so I am wondering if I can do something to improve it so I can still use the M1225s for this project.
Re: M1225 Discriminator Audio
Posted: Mon Sep 28, 2015 7:07 pm
by Bill_G
Pin 11 is as close as you'll get in the Maxtrax/Radius product line for discriminator audio. Normally it sounds perfect. So, if yours sounds bad, something is wrong.
Re: M1225 Discriminator Audio
Posted: Mon Sep 28, 2015 8:34 pm
by TARRA_Mick
Well, I know the GM300 has a jumper for digital. Since I don't have mine up and running yet, just going by what others have said about using this model of radio. I haven't hear it so I don't know. Just trying to have an idea of what to do for it if I need to. Also wonder if I set the radio for narrowband if that may help too?
Re: M1225 Discriminator Audio
Posted: Tue Sep 29, 2015 5:37 am
by Bill_G
Repeater Builder has a whole page devoted to the Maxtrac/Radius series radios. You may find it useful.
If your link radio is running wideband to drive a DStar, and your friends say it sounds lousy, then perhaps you are overdriving the input. Switching to pin 11 should help, and programming for narrowband might also help.
Re: M1225 Discriminator Audio
Posted: Thu Oct 01, 2015 6:39 am
by escomm
TARRA_Mick wrote:Well, I know the GM300 has a jumper for digital. Since I don't have mine up and running yet, just going by what others have said about using this model of radio. I haven't hear it so I don't know. Just trying to have an idea of what to do for it if I need to. Also wonder if I set the radio for narrowband if that may help too?
No. Stop using the speaker audio. Use the flat audio on pin 11. The speaker pins are expecting 8 ohm speakers. I'll bet your audio interface isn't 8 ohms. If it sounds bad it's very likely because you're doing it wrong
Re: M1225 Discriminator Audio
Posted: Thu Oct 01, 2015 6:53 am
by TARRA_Mick
I'm not using speaking audio (and didn't say anything about using it). I am using pin 11. Sorry, that was never a part of my question.