Pro-668: Never seen this before

[tumegpc]

Never seen this before , came up while doing a search . TP4: with live constant values ranging from .800 to 1.400 . Reminds me some threshold values like you'd see in some of the Uniden scanners.

 

[KT4HX]

Haven't seen this either. But here is a wild thought. Several Radio Shack scanners had a Test-Point 4 (TP4) where you could connect a discriminator tap. Is it possible that display is showing you what the levels are at TP4? Not sure why it would do so, but only thing I could think of.

http://wiki.radioreference.com/index.php/Discriminator_output