SQ-1000
SQ-1000 Super Squelch
SQ-1000 – Super Squelch
When supplied with discriminator audio the SQ-1000 will perform the operation of a Squelch
Circuit, COR/CAS Generator, or a Repeater Maker. As quieting occurs, the SQ-1000 will
turn on its audio switch and output the audio to a controller or transmitter. The audio path
through the SQ-1000 has a gain of three. The SQ-1000 also produces a DC logic voltage
change to be used by the controller as a CAS or COR input. A dipswitch selects whether the
logic level is active high or low. The SQ-1000 automatically adjusts closure time with loss
of signal. With a strong signal the switch will close in 20 milliseconds. Closure time
automatically increases as the signal becomes noisier. A red LED lights whenever a signal is
received and the squelch opens. The SQ-1000 connects directly to the audio delay header
on most of the CAT controllers. A second header connector on the SQ-1000 is provided for
the DL-1000C Audio Delay.
COR/CAS Generator
Figure 1 describes how the SQ-1000 is used as a COR/CAS generator. In this configuration
the SQ-1000 is connected to the transceiver port audio delay header of a CAT-200B.
Discriminator noise is sampled by the SQ-1000. When quieting occurs the SQ-1000
produces a DC voltage change that represents a COR input to the controller. Note: On the
SQ-1000 dipswitch #2 must be ON.
CAT-200B
SQ-1000
J1
RX AUDIO #2
TX AUDIO #2
TRANSCEIVER
REPEATER
PTT #1
COR #1
YELLOW
J6
RED
1
2
BROWN
1
ORANGE
GROUND
TX AUDIO #1
5
4
3
2
PTT #2
RX AUDIO #1
GREEN
CONTROLLER
J2
5
3
4
5
4
3
2
1
GROUND
Figure 1
1
DELAY BOARD
Figure 2 describes how the SQ-1000 is connected to the transceiver port audio delay header
of a CAT-1000B. Note: On the SQ-1000 dipswitch #2 must be ON.
CAT-1000
J1
RX AUDIO #2
TX AUDIO #2
TRANSCEIVER
PTT #2
GROUND
LINK PORT
DELAY
BOARD
HEADER J9
5
GREEN
4
3
YELLOW
2
1
ORANGE
RED
BROWN
5
4
3
CONTROLLER
2
1
J2
RX AUDIO #1
5
4
TX AUDIO #1
REPEATER
SQ-1000
PTT #1
3
2
1
COR #1
GROUND
DELAY BOARD
J1
1
2
3
4
5
DL-1000C
Figure 2
The SQ-1000 will support the DL-1000C Audio Delay. Connect the DL-1000C to the J2
connector of the SQ-1000. Set dipswitch #2 OFF to force the audio output through the
delay board.
2
Repeater Maker
Figure 3 describes how the SQ-1000 is used as a Repeater Maker. Connect two transceivers
to the SQ-1000. In this configuration the SQ-1000 monitors the discriminator output of
the receiver. When quieting occurs the SQ-1000 COR/CAS logic output is used as a pushto-talk signal to key the transmitter. Set dipswitch #3 to ON for an active low output and
dipswitch #4 to OFF to disconnect the pull up resistor and dipswitch #2 ON to pass the
receive audio to the transmitter’s modulation input.
TRANSCEIVER #1
(TX)
J1
PTT
GREEN
5
YELLOW
4
GROUND
ORANGE
3
TX AUDIO
RED
2
BROWN
1
SQ-1000
TRANSCEIVER #2
(RX)
RX AUDIO
+
GROUND
-
Dip Switch
+12V POWER
SUPPLY
Figure 3
A four-position dipswitch configures various functions of the SQ-1000.
Switch 1 This switch determines if the audio output is de-emphasized. Switch #1 should
be ON to de-emphasize the audio output.
Switch 2 This switch controls the audio output path. When this switch is ON the audio
output is directed to the controller at J1 pin 2. When this switch is OFF the audio output is
directed to the J2 connector and the DL-1000C Audio Delay board.
Switch 3 This switch determines CAS/COR output logic. This switch should be ON to set
the CAS/COR output active low and OFF to set the CAS/COR output active high.
Switch 4 When this switch is turned ON a 2200-ohm resistor pulls up the COR/CAS output.
This resistor is usually required when the COR/CAS output is set for active low.
Audio Level Adjustment
The SQ-1000 requires discriminator audio for proper operation. Speaker audio or deemphasized audio does not have the high frequency noise component required for proper
operation. A minimum of 50mV of noise is required. Set the Squelch Adjust [R1] to the full
counter clockwise position. Verify that the red LED on the SQ-1000 is ON. Turn the Squelch
Adjust clockwise until the red LED just goes OFF. Provide a signal to the input of the receiver
and check that the red LED turns ON, CAS/COR output on J1 pin 5 is present and audio output
is present on pin #2.
3
SQ-1000 Diagram
Figure 3
SQ-1000 Part List
2
2
1
1
5
2
1
2
2
1
1
1
1
1
1
11
1
1
1
1
1
6
1
6
1
1
1
1
1
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Connector
Diode
I.C.
I.C.
I.C.
I.C.
I.C.
I.C.
LED
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Switch
Transistor
.001uF 50V
.0015uF 16V
.0047uF (SM)
.01uF 50V
0.1uF 50V
1.0uF 16V
10uF 16V
120pF
1X5
BAT43
MC4053
NJM78L05UA
P87LPC767
TC7662
TLC2272
TLC2274
RED SM
1K SM
1.2K SM
2.2K SM
3.3K SM
10K SM
33K SM
100K SM
330K SM
470 SM
100K Variable
4 Position
2N7000
4
C2,C5
C6,C7
C16
C8
C1,C11,C12,C14,C15
C10,C13
C9
C3,C4
J1,J2
CR1
U2
U4
U6
U5
U3
U1
DS1
R10
R5
R15
R4
R2,R7,R8,R13,R16,R17
R18
R3,R9,R11,R12,R19,R20
R6
R14
R1
SW1
Q1
.01uf
C8
Squelch Adjust
R1
50K
R7
10K
1000pf
C2
100K
R8
10K
R2
10K
6
5
3
2
100K
R9
BAT43
CR1
-
+
U1B
7
U1A
TLC2274
1
1K
R10
+
C9
10uf
3.3K
C4
120pf
R4
1000pf
C5
100K
C3
120pf
TLC2272
U3B
7
100K
R3
5
6
+
-
R20
R19
100K
R11
R5
1.2K
.0015uf
C7
R13
10K
9
10
12
13
.0015uf
14
100K
U1C
8
U1D
330K
R6
R12
-5V
-
+
+5V
C6
+
-
+
-
C1
.1uf
+5V
C14
.1uf
13
12
5
15
7
6
U2A
MC4053
87LPC767
Vss
Vcc
X2/P2.0
10K
R17
TXD/P1.0
RXD/P1.1
T0/P1.2
INT0/P1.3
INT1/P1.4
P1.5
P1.6
P1.7
CMP2/P0.0
CIN2B/P0.1
CIN2A/P0.2
AD0/CIN1B/P0.3
AD1/CIN1A/P0.4
AD2/CMPREF/P0.5
AD3/CMP1/P0.6
T1/P0.7
U6
Sq Switch
X1/P2.1
14
12
11
10
9
8
4
3
2
1
20
19
18
17
16
14
13
3
2
+5V
33K
R18
Sq Switch
-5V
SW1C
6
3
3
K
Squelch
DS1
R14
470
+5V
C12
.1uf
+12V
1
COR Polarity
U3A
1
TLC2272
SW1A
8
R16
10K
VIN
2
Date:
Size
B
1
2
+5V
2.2K
R15
C11
.1uf
C10
1uf
COR
+
COR
+12V
COR
+12V
COR Output
+12V In
Ground
8
4
2
+12V
V+
CAP-
CAP+
J2
5
4
3
2
GND
VOUT
U5
ICL7662
3
5
COR
+12V In
Ground
9000-028
Thursday, June 05, 2003
Document Number
Sheet
1
of
-5V
1
1uf
C13
Delay Audio Output
Rev
B
Receiver Audio Output
Receiver Audio Input
Delay Interface
1
Delay Audio Input
J1
5
4
3
2
1
SQ-1000 Super Squelch Board
Q1
2N7000
SW1D
VOUT
SW1B
7
Title
U4
NJM78L05UA
.1uf
C15
GND
2
C16
.0047uf
4
5
3
1
Controller Interface
+
+
-
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising