Control signals for chl operation – Kenwood TM-3530A User Manual
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Control signals for CHL operation
Control signal:
^ ; The control signal with channel data
^ : The control signal with no channel data
Beep:
Beep 1
Beep 2
Flashing CHL indicator-
DCL system indicator ON
I
Beep 2
CHL indicator ON
Time
DCLSW
CHLSW
ON
ON
Time
Original RX freq.
Open channel RX
QSY
Fig. a. Simplex mode
Time
DCL system indicator ON
Flashing CHL indicator
Beep 1
CHL indicator ON
^Beep 2_________
ON ON
Sub tone
1
Sub tone ^
Time ——
Original RX f r e q . - 4 — O p e n channel receive
ON
Approx. 1 sec.
PTT SW
OFF
Fig. b. Offset mode (TM-3530A/2570A/2550A/2530A)
DCL system indicator ON --------------------
Beep 1[«^
— Flashing CHL indicator
^
CHL indicator ON^
'*"^Beep 2
Time
DCLSW
ON
CHLSW
ON
Beep 1
1750 Hz
tone
Time
TONE SW TONE SW PTT SW
ON
OFF
ON Approx. 1 sec.
T
Original RX freq..« t t Open channel RX
Fig. c. Offset mode (TM-2550E)
QSY
PTT SW
OFF
G. Control signal of DCL system
The DCL control signal consists of: 1) Bit/frame sync
signal for distinction of the DCL signal from noise or
other data communication signals; 2) 5-digit digital code
data for station recognition; 3) Open channel data; and 4)
Call sign data which is a combination of alphanumeric
data. Auxiliary data is also provided for future system ex
pansion. This control signal is transmitted at a speed of
1200 baud, requiring approx. 0.2 seconds, which has al
most no effect on normal communication. A beep sound,
peculiar to DCL, (similar to the sound of "packet radio") is
heard when this signal is received.
Synchronizing signal
u------ H—
Oigitat
Channel
Call sign
code
data
data
Composition of control signal
Time
DCL operation control signal
^ The control signal with no channel data
________ DCL system indicator lighting.
t !
DCL SW PTT SW
ON
ON
PTTSW
OFF
Fig. a. Simplex mode
--------------DCL system indicator ON-
DCL SW „
ON
PTT SW
Appro* 1 sec
PTTSW
OFF
Fig. b. Offset mode
(TM-3530A/2570A/2550A/2530A)
___________ DCL system indicator ON_
DCL SW
ON
' Approx 1 sec
PTTSW
ON
PTTSW
OFF
Fig. c. Offset mode (TM-2550E)
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