Linrad "Black"?

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N4SRN
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Joined: 2015/03/07 - 15:23
Linrad "Black"?
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So I read that the Linrad color scheme is Green to Orange to Red on a Blue background, representing increasing signal strength, but I'm not sure what Black bands represent (as attached). Appreciate some help!

BRET
KC1CJN
Southern NH