CTCSS
Operation
The FT-51R can be used to access repeaters
that require a CTCSS (continuous, subaudible)
tone, and to silently monitor for calls on busy
channels. The encode
function superim-
poses a subaudible tone (at a frequency too low
to be heard) on the transmitted carrier. The de-
code
"
-
tone squelch) function monitors
receiver audio through a narrow filter at the
same subaudible frequency, keeping the squelch
closed until you receive a matching tone.
To check or set
CTCSS tone fre-
quency, press
to see
the tone frequency displayed in
Hz. To change the selected tone,
the
DIAL
or press
or
until the display shows
the tone frequency you require
(the display steps through the
standard
EIA tones, listed
table at the right). Press
again alone to return to the op-
erating frequency display.
To activate CTCSS functions,
press
the op-
erating frequency is displayed.
TONE
With one press, (encode) appears at the top of
the display and the tone
is activated
for transmission. Press
or just
if the alternate key functions are still active
(
displayed) and both and
(decode) will
be displayed together as the tone squelch system
is activated for both transmit and receive (only
incoming signals "encoded" with the matching
tone open the squelch). To
off the tone
squelch features, press
once more.
You can store CTCSS tones (and
code states) in each memory in the same manner
(and at the same time) as storing channel
CTCSS
Tone Frequencies (Hz)
67.0
69.3
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
131.8
136.5
100.0
141.3
103.5 146.2
107.2
151.4
192.8
218.1
241.8
quencies.
To change the tone
or state stored in a memory,
just recall it, reset the tone fre-
quency or function, and store
the memory again (press and
hold
for
re-
lease it, and press it again mo-
mentarily). If you activate
CTCSS on
a
subband limit
memory, it will be active when
that
memory is used to start
subband operation.
Summary of Contents for FT-51R
Page 1: ...FT 51R Dual Band FM Paging Transceiver...
Page 43: ......
