RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 
Wiki Home
Page
View source
History


Personal Tools

Search the Wiki





 

Discriminator output


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, UniTrunker, and DSD. 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 or MPT-1327 decoding, a connection from an earphone or speaker output is all that's required. This is because these modes run at a much lower speed, and the discriminator is not involved in AM reception (for ACARS decoding).

Modifications

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

Uniden


Radio Shack


Other Radios


Why use a resistor and/or capacitor ?

See #6 through 8 of this URL: Discriminator.nl FAQ

Wikipedia Page showing Circuit and calculations for Discriminator Tap.


Related Pages

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


Copyright 2018 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions