Uniden Sc230 Vhf Uhf Scanner Owners Manual

11
Feature Highlights
Feature HighlightsGeneral
Close CallTM RF Capture Technology - you can set the 
scanner so it detects and provides information about 
nearby radio transmissions. See “Using the Close Call 
Feature” on Page 72 for more information.
Dynamically Allocated Channel Memory - your 
scanner’s memory is organized so that it more closely 
matches how radio systems actually work, making it easier 
to program and use your scanner and determine how 
much memory you have used and how much you...

12
Feature Highlights
CTCSS and DCS Squelch Modes – prevent 
interference from stations not using the mode you select.
Dropout Delay – You can set whether the scanner 
pauses at the end of a transmission to wait for a reply. 
You can set the delay time for each system you scan, and 
while searching and using the Close Call feature.
Attenuator – You can set the scanner’s attenuator to 
reduce the input strength of strong signals by about 18 dB 
received by the scanner.
Repeater Reverse – You can set the...

13
Feature Highlights
Memory Backup – If power is lost or disconnected, the 
scanner retains the frequencies you programmed in its 
memory. 
22 Bands – Includes 22 bands, with Aircraft and 800 MHz.
Note: The scanner’s frequency coverage is not continuous 
and does not include the cellular telephone band. 
Weather
Weather Search – Lets your scanner receive your local 
NOAA weather transmission.
SAME Weather Alert – Lets your scanner alert you when 
a SAME weather alert is transmitted on a NOAA weather...

14
Feature Highlights Backlight and Power
LCD Back Light – Makes the display easy to see in dim 
light. You can adjust the back light so it turns on when you 
press a key, when squelch breaks during a transmission, 
or manually.
Low Battery Alert – The scanner alerts you if the 
batteries need to be recharged or replaced.
Battery Save – You can set the scanner so it reduces the 
amount of power it needs if there are no transmissions.
Key Controls
Key Lock – You can deactivate the scanner’s keys to help...

15
Feature Highlights
How the Scanner’s Controls Are 
Represented in This Manual
To help navigate the scanner’s menus, the steps shown in 
this manual show the displays you see and the keys you 
press or control you operate to get a desired result.
This example shows you how to use the scanner’s menu 
to edit an existing system name. It shows you the key to 
press () to select a menu option and the option you 
see (Program System) when you press  . It also 
instructs you to turn the scroll control (shown...

16
Understanding Scanning
Understanding ScanningThis section provides you with background on how 
scanning works. You don’t really need to know all of this 
to use your scanner, but some background knowledge 
will help you get the most from your SC230. 
Understanding the Scanner’s Memory
Your scanner’s memory is organized in an architecture 
called Dynamic Allocated Channel memory. This type of 
memory is organized differently and more efficiently than 
the bank/channel architecture used by traditional...

17
Understanding Scanning
lower and upper limits you specify. When the scanner 
finds an active frequency, it stops on that frequency as 
long as the transmission lasts. If you think the frequency 
is interesting, you can program it into the scanner’s 
memory. If not, you can continue to search. 
What is CTCSS/DCS?
Your scanner can monitor systems using a Continuous 
Tone Coded Squelch System (CTCSS) and Digital Coded 
Squelch (DCS) system, which allow squelch to open only 
when the tone you have...

18
Understanding Scanning
You can search for the following CTCSS frequencies and 
DCS codes.
CTCSS Frequencies (Hz)
DCS Codes (Octal)
  67.0   69.3   71.9   74.4   77.0   79.7
  82.5   85.4   88.5   91.5   94.8   97.4
100.0 103.5 107.2 110.9 114.8 118.8
123.0 127.3 131.8 136.5 141.3 146.2
151.4 156.7 159.8 162.2 165.5 167.9
171.3 173.8 177.3 179.9 183.5 186.2
189.9 192.8 196.6 199.5 203.5 206.5
210.7 218.1 225.7 229.1 233.6 241.8
250.3 254.1
023 025 026 031 032 036 043 047
051 053 054 065 071 072 073...

19
Understanding Scanning
Using the Scanner at the Racetrack
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...

20
Understanding Scanning
When you want to store a conventional system, all you 
need to know is the frequencies they operate on. 
When you are scanning a conventional system, 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. 
Simplex Operation
Simplex systems use a single frequency for both transmit 
and receive. Most radios using this...