This article is from the Motorsport FAQ, by A H Henry bspahh@midge.bath.ac.uk with numerous contributions by others.
At a racetrack, Walkman type headphones will not cut enough ambient
sound in order to hear the scanner. Enclosed headphones will cover the
entire ear so that you will be able to hear something other than the
cars as they go past. A good set will cost between US $ 75-100, but
will make all the difference in the world as to what you can hear at
the track.
The other way to hear more is to increase the volume of the scanner.
Some of the vendors of scanners can change this for you.
Alternatively, if you've used a soldering iron before, you may be
able to do many of the modifications by yourself. Modifications to the
scanner by the end user will void all warranties so make sure you get
your modification instructions from a good source.
There are instructions for modifying scanners at:
ftp.cs.buffalo.edu ftp://ftp.cs.buffalo.edu/pub/ham-radio/mods
ftp.cs.buffalo.edu ftp://garfield.catt.ncsu.edu/pub/ham-radio/mods
oak.oakland.edu ftp://oak.oakland.edu/pub/ham-radio/mods
 
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