ANALOG MODULATION MODE
3-57
Signalling
CTCSS
A CTCSS tone is any one of 32 standard sub-audible tones ranging from 67 Hz to 250.3 Hz and
would generally be used in conjunction with an audible modulation signal in a composite
modulation mode. The procedure for initiating these tones is as follows:
Tone selection
(1) At the
Sig Gen
menu, press
[Select Source]
.
(2) At the
Internal Source Selection Menu
, press
[CTCSS]
. The
Continuous Tone Selection Menu
is now displayed, see Fig. 3-55.
(3) Key in the required tone number (0 to 15) and press [enter].
Tone
Number
Select
Source
LOCAL
Edit
Standard
Select
Standard
Continuous Tone Selection Menu
Current Standard: CTCSS 1
C1889
Hz
Tone Number:
Int F4:
01 --
71.9
ctc1
Fig. 3-55 Continuous tone selection menu
Selecting alternative tone standards
A list of the 16 tones of the current standard is available by pressing
[Select Standard]
. This action
displays the
Tone Standard Selection Menu
with the current standard highlighted. To select from
further lists of 16 tones, press
[CTCSS2]
or
[USER]
. The
Tone
Standard Selection
Menu
changes
to show the new list.
Editing a tone standard
Pressing
[TEMP]
displays a further list of 16 tones set to the default value of 10 Hz. The standard
can be edited by selecting
[Edit Standard]
from the menu in Fig. 3-55. This gives you the
Continuous Tone Edit Utility
menu.
CTCSS 1, CTCSS 2 or USER can be be loaded to TEMP, which is a volatile store of 16 tones set
at a default value of 10 Hz at switch on. Tones can then be changed by using
[Tone No]
,
[Tone
Freq]
,
[Next Tone]
or
[Previous Tone].
When the required changes have been made, the new
standard can be saved by pressing
[Store to User]
.
USER
then becomes a user defined standard.
Selecting [CTCSS1], [CTCSS2], [USER] or [TEMP] from the Tone Standard Selection Menu
causes the pictogram in the Continuous Tone Selection Menu and the Internal Source
Selection Menu to change e.g. ctc1. The pictogram is repeated in the modulation section of
the Sig Gen menu.