23
FT-1900R O
PERATING
M
ANUAL
CTCSS/DCS/EPCS O
PERATION
CTCSS O
PERATION
Many repeater systems require that a very-low-frequency audio tone be superimposed on your
FM carrier in order to activate the repeater. This helps prevent false activation of the repeater by
radar or spurious signals from other transmitters. This tone system, called “CTCSS” (Continuous
Tone Coded Squelch System), is included in your
FT-1900R
, and is very easy to activate.
CTCSS setup involves two actions: setting the Tone Mode and then setting of the
Tone Frequency. These actions are set up by using the Set (Menu) mode, selec-
tions #49 (SQL.TYP) and #52 (TN FRQ).
1. Press and hold in the [
MHz
(
SET
)] key for one second, then
rotate the
DIAL
knob to select “
49 SQL.TYP
.”
2. Press the [
MHz
(
SET
)] key, then rotate the
DIAL
knob so that “
TONE
” appears on the
display; this activates the CTCSS Encoder, which allows
repeater access.
3. Rotating the
DIAL
knob one more click clockwise in the above step will cause “
TSQL
”
to appear. When “
TSQL
” appears, this means that the Tone Squelch system is active,
which mutes your
FT-1900R
’s receiver until it receives a call from another radio send-
ing out a matching CTCSS tone. This can help keep your radio quiet until a specific call
is received, which may be helpful while operating in congested areas.
1
)
You may notice a “
RV TN
” indication on the display while you rotate the
DIAL knob in this step; this means that the Reverse Tone Squelch system is
active, which mutes your FT-1900R’s receiver (instead of opening the squelch) when
it receives a call from the radio sending a matched CTCSS tone. The “
T SQ
” icon will
blink on the display when the Reverse Tone Squelch system is activated.
2
)
You may notice a “
DCS
” indication on the display while you rotate the DIAL knob
still more. We’ll discuss the Digital Code Squelch system shortly.
4. When you have made your selection of the CTCSS tone mode, press the [
MHz
(
SET
)]
key momentarily, then rotate the
DIAL
knob three clicks clockwise to select Menu “
52
TN FRQ
.” This Menu selection allows setting of the CTCSS
tone frequency to be used.
5. Press the [
MHz
(
SET
)] key to enable adjust-
ment of the CTCSS frequency.
6. R o t a t e t h e
D I A L
k n o b
until the display indicates the Tone Fre-
quency you need to be using.
7. When you have made your selection, press
and hold in the [
MHz
(
SET
)] key for one
second to save the new setting and exit to
normal operation.
CTCSS TONE FREQUENCY
(
Hz
)
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
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