Dtmf Paging & Code Squelch - Yaesu FT-51R Owner's Manual

disabled the ringer). Just press
it off. If you have set up normal tone squelch
operation beforehand, you can continue your
QSO.
You cannot store the CTCSS Bell mode selec-
tion in a memory, although you can store differ-
ent CTCSS tones and encode/decode states.
DTMF Code Squelch
The FT-51R includes a DTMF (Dual-Tone,
Multi-Frequency) tone encoder/decoder and a
dedicated microprocessor providing paging and
selective calling features. This allows you to
place a call to a specific station or group, and to
receive calls directed only to you or to groups of
your choice.
The paging and code squelch systems use
3-digit numeric codes (000
DTMF (dual, audible) tone pairs. There are
eleven Code Memories numbered I
P, which store 3-digit DTMF paging codes (these
are independent and unrelated to the channel
memories and the VFOs).
Your receiver remains silent until it receives
three DTMF digits that match those stored in one
of its code memories. The squelch then opens so
CODE C
once to turn
Paging
-
-
the caller is heard, and in the paging mode, the
LCD and keypad light as the paging ringer im-
mediately sounds (see page 56). When you press
the the same three pre-stored DTMF code
digits are transmitted automatically. In the pag-
ing mode, three more DTMF digits are sent, rep-
resenting the 3-digit identification code of the
transmitting station.
Like the CTCSS Bell system described pre-
viously, the DTMF paging and code squelch sys-
tems are selected by pressing
or
CODE
PAGE, TPAGE
play when DTMF paging, trigger paging or code
squelch is activated, respectively. The following
descriptions begin with an overview of the vari-
ous DTMF selective calling features, followed by
details of actual operation.
Squelch
DTMF
Code
The code squelch mode is very simple: both
you and the other station communicate using
the same 3-digit DTMF sequence, sent automat-
ically at the start of every transmission. Your
receiver normally remains silent to all signals
that are not prefixed by your selected 3-digit
code. When you receive the matching tone se-
Either the
icon appear on the dis-