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Discriminator output

From The RadioReference Wiki

The Discriminator output from a scanner is the raw, unfiltered signal that a scanner produces before it is sent to the audio stage for output through the speaker -- also called the "baseband audio." This discriminator source is required for applications such as Trunker, T4Win, and UniTrunker. Most scanners must have a simple modification made to them to feed the discriminator output to Data Slicers, or in the case of UniTrunker, a soundcard.

Note that for providing a signal for ACARS decoding, a connection from an earphone or speaker output is all that's required. This is because ACARS runs at a much lower speed, and the discriminator is not involved in AM reception.

Modifications

Also see the Scandata faq q2 article for a list of older scanners' tap points. This is from an original article by the late Bill Cheek.

Uniden

Radio Shack


Other Radios

Links

These pages or links contain more information on discriminator taps for many brands and models of scanners, including older models