BTX-125 VHF/BTX-126 UHF Business-Band Transceivers
(190-1215/16)              CTCSS Option               Faxback Doc. # 17363

WHY USE CTCSS?

CTCSS (Continuous Tone-Coded Squelch System) is available as an optional
add-on to your transceiver.  When CTCSS is turned on, the transceiver 
transmits a selected tone with your transmission. This tone is too low for 
you to hear, but other transceivers can detect it.  If CTCSS is turned on 
and set to the same tone on the receiving transceiver, it only receives 
transmissions that include the tone (such as those from another person in 
your business).  This way, CTCSS can help eliminate interference between 
different users of the same frequency.

For example, if two different groups operate transceivers in the same area
on the same frequency but use a different CTCSS tone, they do not hear each
other's broadcasts.

SETTING THE CTCSS TONE

NOTE:  If you are a part of a talk group, be sure all of the radios in the
       talk group use the same tone.

1.  Turn off the radio.

2.  Unlock the battery compartment cover by setting the cover's latches to
    the release position, as shown.  (The orange tabs should be visible.) 
    Then slide the cover down and lift it off.

3.  Remove the battery pack and tray.  This exposes the bank of CTCSS 
    switches.

4.  Determine the CTCSS tone to be used and find the corresponding switch
    positions in the CTCSS Code Table (on Pages 28 and 29).

5.  With a pointed instrument, such as a pin, place the dip switches in the
    positions that match the desired tone. The up position is vertically
    up and the down position is vertically down if looking at the
    instrument horizontally.

6.  After setting your CTCSS code, replace the battery tray, battery, and
    battery compartment cover, then turn on the radio.

NOTE:  Setting Switch 8 to the down position disables the CTCSS feature. 
       You must set the switch to the up position to turn on CTCSS.

CTCSS CODE TABLE

┌──────────────────┬───────────────────────────────────────┐
│                  │   SWITCH POSITION (U= Up, D=Down)     │
│  CTCSS   FREQ    ├───────────────────────────────────────┤
│  CODE    (Hz)    │       1   2   3   4   5   6   7   8   │
├──────────────────┼───────────────────────────────────────┤
│   XZ      67.0   │       D   D   D   D   D   D   U   U   │
│   XA      71.9   │       U   D   D   D   D   D   U   U   │
│   WA      74.4   │       D   D   D   D   D   U   U   U   │
│   XB      77.0   │       U   U   D   D   D   D   U   U   │
│   WB      79.7   │       D   D   D   D   U   D   U   U   │
│   YZ      82.5   │       U   D   D   D   D   U   U   U   │
│   YA      85.4   │       D   D   D   D   U   U   U   U   │
│   YB      88.5   │       U   U   D   D   D   U   U   U   │
│   ZZ      91.5   │       D   D   D   U   D   D   U   U   │
│   ZA      94.8   │       U   D   D   D   U   D   U   U   │
│   ZB      97.4   │       D   D   D   U   D   U   U   U   │
│   1Z      100.0  │       U   U   D   D   U   D   U   U   │
│   1A      103.5  │       U   D   D   D   U   U   U   U   │
│   1B      107.2  │       U   U   D   D   U   U   U   U   │
│   2Z      110.9  │       U   D   D   U   D   D   U   U   │
│   2A      114.8  │       U   U   D   U   D   D   U   U   │
│   2B      118.8  │       U   D   D   U   D   U   U   U   │
│   3Z      123.0  │       U   U   D   U   D   U   U   U   │
│   3A      127.3  │       U   D   D   U   U   D   U   U   │
│   3B      131.8  │       U   U   D   U   U   D   U   U   │
│   4Z      136.5  │       U   D   D   U   U   U   U   U   │
│   4A      141.3  │       U   U   D   U   U   U   U   U   │
│   4B      146.2  │       U   D   U   D   D   D   U   U   │
│   5Z      151.4  │       U   U   U   D   D   D   U   U   │
│   5A      156.7  │       U   D   U   D   D   U   U   U   │
│   5B      162.2  │       U   U   U   D   D   U   U   U   │
│   6Z      167.9  │       U   D   U   D   U   D   U   U   │
│   6A      173.8  │       U   U   U   D   U   D   U   U   │
│   6B      179.9  │       U   D   U   D   U   U   U   U   │
│   7Z      186.2  │       U   U   U   D   U   U   U   U   │
│   7A      192.8  │       U   D   U   U   D   D   U   U   │
│   M1      203.5  │       U   U   U   U   D   D   U   U   │
│   M2      210.7  │       U   D   U   U   D   U   U   U   │
│   M3      218.1  │       U   U   U   U   D   U   U   U   │
│   M4      225.7  │       U   D   U   U   U   D   U   U   │
│   M5      233.6  │       U   U   U   U   U   D   U   U   │
│   M6      241.8  │       U   D   U   U   U   U   U   U   │
│   M7      250.3  │       U   U   U   U   U   U   U   U   │
├──────────────────┤       X   X   X   X   X   X   X   D   │
│    Disable       └───────────────────────────────────────┤
│     CTCSS                Note: X = either Up or Down     │
└──────────────────────────────────────────────────────────┘