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Does this interface send the audio in through the mic jack? if so the filtering in the radios mic circuit will be a bottleneck that will limit any potential gains. Now I'm not really up on Sonar radios but older AM only rigs seem to have "looser" audio filtering than a relatively more modern SSB radio, I would think that there is some potential for the Sonar to sound better than the Uniden but the only way to know is to try.


Now if this interface is some type of direct inject deal then this whole conversation is above my pay grade so you can feel free to ignore me.


That being said I don't believe relying on on air reports is the best way to set up hi/mid fi stuff, if I was going to do what you're planning I would probably get a cheap SDR for monitoring/recording purposes.