Uniden SC230 사용자 설명서

19

Keeping up with the action at the racetrack is easy and 
fun. You can hear drivers communicating with their pit 
crews, officials communicating with drivers and crews, 
and track workers communicating with everybody. 
Each user at the racetrack transmits and receives on one 
or more frequencies. 

The scanner organizes racetrack frequencies by the 
name of the race you are scanning and by car number. 
For example, you might hear drivers and their pit crews 
on the car number frequencies and officials and the news 
media on the race frequencies. When you are scanning, 
the scanner stops very briefly on each channel to see if 
there is activity. If there isn’t, the scanner quickly moves 
to the next channel. If there is, then the scanner pauses 
on the transmission until it is over. 

You can activate one racing system and as many 
conventional systems as you want at the same time. 
Within a racing system, each driver can have multiple fre-
quencies stored, but only one of their frequencies is 
unlocked at any one time. If you select a driver frequency, 
their other frequencies are automatically locked.

Conventional scanning is a relatively simple concept. 
Each group of users in a conventional system is assigned 
a single frequency (for simplex systems) or two 
frequencies (for repeater systems). Any time one of them 
transmits, their transmission always goes out on the 
same frequency. Up until the late 1980s, this was the 
primary way that radio systems operated. 

Even today, there are many 2-way radio users who 
operate using a conventional system: 

• Aircraft
• Amateur radio 
• FRS/GMRS users 
• Broadcast AM/FM/TV stations 
• Many business radio users 

SC230 Paper OM.fm  Page 19  Wednesday, October 6, 2004  10:51 AM