GNF??

Hello again...I got a Galaxy dx959 for christmas and was wondering about the GNF..It does seem to quiet things down..Can anyone tell me what this is/does, I am familiar with the N/B and ANL switch but the GNF is a new one on me..

 

[SIZE=-1]Galaxy Noise Filter for use on weak signals
http://www.cbtricks.com/radios/galaxy/dx959/index.htm

didnt it come with a manual ? RTM
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GNF stands for Galaxy Noise Filter cuts out weak signals.

 

Wow.. I didn't see Booty's post earlier..I must be losing it double posted reply my bad.

 

Thanks guys, the manual is at my dad's where I installed the radio, won't be back out there until next week.