1
CPI Communications, Inc. • 941Hensley Lane • Wylie, TX 75098-4909
Phone (972) 429-7160 • WATS (800) 869-9128 • FAX (888) 437-5360 or (972) 429-7165
DTP Series
DC Termination
Panels
Rev. B 9/00
DTP Series manual.p65
Instruction Manual
2
General Information
The CPI Communications DTP series DC remote adapters provide a reliable means of remotely controlling
a two-way radio base station or repeater over in-house or leased metallic pair wiring.
The DTP series can be used with CPI DC remotes as well as most other manufacturers DC remote consoles.
The DTP remote adapters are available in the following variations, all of which provide adjustable RX and
TX amplification and dip switch selection of control current format:
MODEL DESCRIPTION
DTP1 Board only product, provides PTT.
DTP2 Board only product, provides PTT and monitor functions.
DTP3 Board only product, provides PTT, monitor, F1/F2 functions.
Installation
Connect the leased or in-house metallic twisted-pair 600 ohm line, to the DTP board via J2. (the RJ-11 jack)
Connect an external 12 to 16 volt semi-regulated DC power supply to J1 with the positive lead to J1-2 and
the negative lead to J1-7.
Connect the radio receiver audio output to J1-6. Radio receiver audio output should be a source that is after
the squelch circuit and not affected by the radio's volume control adjustment. If a squelched audio source is not
available there is a squelch circuit provided on the DTP series termination panels. J1-5 is the input to the DTP's
squelch circuit. It can be configured active high or active low using jumpers JU14 and JU15.
Connect the radio microphone input to J1-1. If microphone input is high-impedance, shielded cable should
be used and R65 on the DTP board should be clipped. If a local microphone is used the mic high should be
connected to J1-3.
If you have a DTP2, connect the monitor circuit of the radio to the DTP2 board using the form "C" relay
contacts at J1-8, J1-9, and J1-10.
Connect the radio PTT circuit to the DTP at J1-4. For radios that key to a positive voltage instead of ground,
the PTT circuit can be altered using JU1 and JU2.
The DTP3 provides a form "C" set of relay contacts at J1-12, J1-13, and J1-14 for two channel frequency
selection. The relay output is factory set to be momentary. This can be changed to latching by using JU-16. The
DTP1 and DTP2 do not provide these contacts.
Level Adjustments
The following level adjustments are normally required only at the time of installation.
1. RX Audio Adjustment
R57 controls the RX audio level to the phone line. With the phone line connected at J2, connect a RMS
voltmeter to the leads of R61 and R62. Unsquelch the receiver so that continuous noise is present and adjust
potentiometer R57 for 0 dBm or 0.8 V rms on the meter.
2. TX MOD Adjustment
This section assumes that each remote in the system has been set to provide an average voice audio level
of 0 dBm as measured at the DTP panel.
Have someone at the remote control console depress and hold the PTT switch. With a voice coming from
the remote, adjust R47 to provide proper transmitter deviation.
3
Switch Settings
The following table lists dip switch setting for DTP series.
Dip switch 4 is normally in the OFF position. When in the ON position, The perceived polarity of the phone
lines is reversed.
Modulation output is adjustable from 2 mVRMS to 565 mVRMS with 0 dBm on the phone lines. The phone
lines can be driven to 0 dBm with an RX input level from 88 mVRMS to 880 mVRMS. A 0 dBm level on the
phone line back to the remote can be produced with a mic high input between 2 mVRMS and 565 mVRMS.
Parts List
DTP Series PCB #700-DTPX-200 Rev. B
Reference Description CPI Part #
CAPACITORS
C1,18 100uF Elec Rad 208-2021-107
C2,3,5,15,16 .1uF Mono Cer Dip 208-0092-104
C4 10uF Elec Rad 208-4022-106
C6,27 1uF Elec Rad 208-4052-105
C9,10 4.7uF 100V Elec Rad 208-2062-475
C11,12 20pF Cer 208-0001-200
C13,14,17,21,22 .01uf Mono Cer Dip 208-0092-103
C23 180pF Mono Cer Dip 208-0071-181
C24 .047 Mono Cer Dip 208-0092-473
C25 2200pF Mono Cer Dip 208-0071-222
C26 1uF Elec Rad Non-Polar 208-2000-001
C28 2.2uF Elec Rad 208-4052-225
DC Remote Provides Set Switches
PTT (F1) PTT (F2) Mon (F1) Mon (F2) 1 2 3
DTP1, DTP2
& DTP3 +/- 15mA OFF OFF OFF
+/- 6mA ON OFF OFF
DTP2 & DTP3 +/- 15mA +/- 6mA OFF ON OFF
+ 15mA -6 mA ON ON OFF
+/- 6mA +/- 2.5mA OFF OFF ON
+ 6mA - 2.5mA ON OFF ON
DTP3 + 6mA + 15mA - 2.5mA - 2.5mA OFF ON ON
+ 15mA - 15mA + 6mA - 6mA ON ON ON
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
U5
U6 U7
411
7
14
MOD OUT
+13.8 V
LOCAL MIC INPUT
PTT
SQUELCH
RX INPUT
GROUND
MON NO
MON NC
MON COM
F2 NO
F1 NC
GROUND
F1/F2 COM
LOCAL MIC INPUT
LOCAL MIC INPUT
MOD OUT
PTT
MON NO
MON NC
MON COM
F2 NO
F1 NC
F1/F2 COM
RX INPUT
+13.8 V
GROUND
SQUELCH
CW
LOCAL MIC
AUDIO TO
REMOTES
INSTALL JU9 FOR HIGH
LEVEL MIC AUDIO
INSTALL JU14 TO MUTE
RECEIVE AUDIO WITH
LOW SQUELCH INPUT
INSTALL JU15 TO MUTE
RECEIVE AUDIO WITH
HIGH SQUELCH INPUT
PER OCTAVE DE-EMPHASIS
RX INPUT
INSTALL JU4 IF RECEIVE
AUDIO FROM RADIO
IS HIGH LEVEL
INSTALL JU12 FOR 6dB
PER OCTAVE DE-EMPHASIS
REMOVE JU13 FOR 6dB
BALANCE
INSTALL JU19 & JU20
FOR TWO WIRE HALF DUPLEX
JU7 INSTALLED FOR TWO
WIRE OPERATION
INSTALL JU17 & JU18
FOR -4W AND -FD OPTIONS
INSTALL JU5 ONLY
FOR -4W OPTION
CW
ON FOUR WIRES
PARTS INSTALLED
FOR -4W OPTION
INSTALL JU6 FOR
PARTS INSTALLED FOR -FD OPTION
MOD OUT
FULL DUPLEX OPERATION
A DVM CONNECTED
ACROSS R31 WILL
DISPLAY LOOP CURRENT
+
-
INSTALL JU8 FOR LOW
LEVEL MOD OUT
POSITIVE POLARITY DETECT
2.5 mA DETECT
6 mA DETECT
11 mA DETECT
JU2 IN & JU1 OUT
FOR PTT TO GND,
REVERSE FOR PTT
TO +V
D16 IS ILLUMINATED WHEN
K1 IS ENERGIZED
D3 ILLUMINATED WHEN
K2 IS ENERGIZED
K3 IS ENERGIZED
D5 ILLUMINATED WHEN
LOCAL MIC MUTE
INSTALL JU16 FOR LATCHED F1/F2 OUTPUT
REMOVE JU16 FOR MOMENTARY (100 mS) OUTPUT
RX MUTE
LOCAL MIC MUTE
INSTALL JU11 FOR
PTT TO GROUND
INSTALL JU10 FOR
PTT TO +V
CW
CW
JU3 INSTALLED TO
MONITOR WHEN PTT
B
DTP SERIES DC TERMINATION PANEL
CPI COMMUNICATIONS, INC.
(972) 437-5320 (800) 869-9128
D
1 1Tuesday, October 17, 2000
Title
Size Document Number Rev
Date: Sheet of
B1
A1
B10
A[0..4]
A2
A0
A1
A4
A3
A2
A4
A3
B[1..14]
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B3
B4
B8
B9
B12
B13
B14
B2
B6
B5
B3
B7
B11
A0
VCC
+5
VCC
VCC
VCC
VB
VB
VB
VB VB
VB
+5
+5
VCC
VB
+5
+5
+5
VB
VB
VB
VCC
VCC
VCC
VCC
+5
+5
+5
+5
VCC
VCC
VCC
VCC
VCC
VCC
VSS VEE
VDD
VB
K3
MZ12HG
6
1
211
12
D6
1N4148
Q2
2N2222
R12
4.7K
R2
1K
D5
LED-YELLOW
JU2
C17
.01
C18
100
R33
470
R34
470
JU14
+
-
U5D
LF347
12
13 14
JU15
R41
100K
JU6
C8
4.7
100 VOLT
V2
ERZ-C05DK330
C7
4.7
100 VOLT
C20
.01
R60
47
JU18
R46
470 JU5
JU17
R59
47
L1
150uH
L2
150uH
C19
.01
T1
600:600
14
36
V1
ERZ-C05DK330
R56
68K
R55
470K
U7D
4066
8 9
6
K1
DPDT RELAY
13
11
9
4
6
8116
JU8
C23
180pF
R49
330K
R48
1K
C26
1
R45
100K
C13
.01
R73
100K
R65
620
R66
47K
D2
1N4148
R3
1K
Q3
2N2222
R47
25K POT
13
2
R50
100K
+
-
U6D
LF347
12
13 14
U7A
4066 12
13
U7B
4066
1110
12
+
-
U5B
LF347
5
67
C15
.1
R57
25K POT
1 3
2
R64
18K
R67
470K
JU1
R75
6.8K
C27
1
+
-
U5C
LF347
10
98
R40
100KR39
68K
R54
470K
R44
100K
C14
.01 U7C
4066
4 3
5
JU10
D17
IN4148
JU11
R72
100K
JU4
JU9C16
.1
C1
100
V4
ERZ-C05DK330
C2
.1 C4
10 C5
.1 C6
1
R32
27
D1
1N4004
J2
MODJACK 6
5
6
3
4
1
2
JU12
JU3
D11
1N4148
R13
4.7K
R43
1K
R42
120K
R38
10K
R63
6.8K
C24
.047
+
-
U5A
LF347
3
21
R37
2.7MR36
47K
R74
8.2K
R71
13K
R26
100K
U3B
PS2501-43
4
13
14
R25
100K
R7
22K
R10
56
D18
1N4148
D16
LED-RED
J1
CON14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
R6
390
D10
1N4148
Q11
2N2222
Q13
2N2222
D8
1N4148
Q8
2N2222
R24
100K
D7
1N4148
U3C
PS2501-45
6
11
12
U3D
PS2501-47
8
9
10
R4
1K R9
47K
R23
100K
D9
1N4148
R5
10K
Q12
2N2222
Q10
2N2222
U3A
PS2501-41
2
15
16
R31
100
R8
150
Q9
2N2222
R35
10K
U1
MC78L05ACP
3 1
2
VIN VOUT
GND
Y1
4MHZ
C12
20pF
C11
20pF
U2
TL7757
3
1 2
GND
RST +V
C3
.1
R14
39K
R27
100K
R28
100K
R29
100K
R30
100K
R76
100K
JU16
S1 1
2
3
4
8
7
6
5
U4
MICRO54
14
4
6
7
8
9
10
11
12
13
3
5
15
16
17
18
1
2
V+
RST
+ POL
11 mA
6 mA
2.5 mA
RB4
RB5
RB6
RB7
RTCC
GND
OSC2
OSC1
PTT
MON
F1/F2
RA3
T2
600:600
14
36
R58
25K POT
13
2
JU19
K2
MZ12HG
6
1
211
12
D4
1N4148
Q1
2N2222
R11
4.7K
R1
1K
D3
LED-GREEN
R16
33K
Q4
2N2222
R15
1K
R22
33K
Q7
2N2222
R21
1K
R20
33K
Q6
2N2222
R19
1K
R18
33K
Q5
2N2222
R17
1K
D12
LED-YELLOW
D15
LED-AMBER
D14
LED-GREEN
D13
LED-RED
JU13
C28
2.2
R68
10K
+
-
U6C
LF347
10
98
R70
1K
R51
22K
R53
25K POT
13
2R69
150K
L4
150uH
C10
4.7
100 VOLT
C22
.01
V3
ERZ-C05DK330
R52
470
C25
2200pF
+
-
U6B
LF347
5
67
JU20
C21
.01
R61
47
JU7
C9
4.7
100 VOLT
R62
47
L3
150uH
+
-
U6A
LF347
3
2
1
PTT
2.5mA
6mA
11mA
POL
MON
F1/F2
CPI
COMMUNICATIONS,
INC.
DTP
SERIES
700-DTPX-200
REV
B
S/N
C
1994
10
T1
T2
C20
C19
C22
C21
C2
C5
C17
C23
C14
C13
C25
C24
C15
C16
C3
C12
C11
V2
V1
V4
V3
C7
C8
C10
C9
C4
C6
C26
C28
C27
JU5
JU6
JU7
JU8
JU1
JU2
JU11
JU13
JU12
JU4
JU14
JU15
JU3
JU9
JU20
JU19
JU18
JU17
JU16
R47
R53
R57 R58
D9
D2
D17
D11
D8
D7
D10
D6
D4
D18
C1
C18
U1
U2
U6
U5
U7
R50
L2
L1
L4
L3
R48
R32
R49
R59
R60
R61
R62
R33
R34
R46
R65
R66
R3
R44
R40
R39 R54
R72
R45
R70
R69
R68
R51
R71
R74
R64
R67
R63
R75
R42
R43
R38
R37
R36
R35
R55
R56
R41
R73
R13
R14
R27
R28
R29
R30
R16
R15
R22
R21
R20
R19
R18
R17
R31
R26
R10
R8
R6
R4
R5
R7
R9
R23
R24
R25
R2
R12
R11
R1
R52
R76
K1
D16
D12
D15
D5
D3
D1
Q3
Q4
Q7
Q6
Q5
Q9Q8
Q11
Q10
Q13
Q12
Q2
Q1
U4
S1
Y1
U3
K3
K2
J1
J2
PTT
2.5mA
6mA
11mA
POL
MON
F1/F2
CPI
COMMUNICATIONS,
INC.
DTP
SERIES
700-DTPX-200
REV
B
S/N
C
1994
10
T1
T2
C20
C19
C22
C21
C2
C5
C17
C23
C14
C13
C25
C24
C15
C16
C3
C12
C11
V2
V1
V4
V3
C7
C8
C10
C9
C4
C6
C26
C28
C27
JU5
JU6
JU7
JU8
JU1
JU2
JU11
JU13
JU12
JU4
JU14
JU15
JU3
JU9
JU20
JU19
JU18
JU17
JU16
R47
R53
R57 R58
D9
D2
D17
D11
D8
D7
D10
D6
D4
D18
C1
C18
U1
U2
U6
U5
U7
R50
L2
L1
L4
L3
R48
R32
R49
R59
R60
R61
R62
R33
R34
R46
R65
R66
R3
R44
R40
R39 R54
R72
R45
R70
R69
R68
R51
R71
R74
R64
R67
R63
R75
R42
R43
R38
R37
R36
R35
R55
R56
R41
R73
R13
R14
R27
R28
R29
R30
R16
R15
R22
R21
R20
R19
R18
R17
R31
R26
R10
R8
R6
R4
R5
R7
R9
R23
R24
R25
R2
R12
R11
R1
R52
R76
K1
D16
D12
D15
D5
D3
D1
Q3
Q4
Q7
Q6
Q5
Q9Q8
Q11
Q10
Q13
Q12
Q2
Q1
U4
S1
Y1
U3
K3
K2
J1
J2
6
Top View
Bottom View
7
Reference Description CPI Part #
DIODES
D1 1N4004 Rect 212-0002-004
D2,4,6,7,8,9,10,11,17,18 1N4148 Small Signal Switching 212-0110-012
D3,14 LED T1 Green 214-0002-004
D5,12 LED T1 Yellow 214-0002-003
D13,16 LED T1 Red 214-0002-001
D15 LED T1 Amber 214-0002-002
TRANSISTORS
Q1,2,3,4,5,6,7,8,9,10,11,12,13 2N2222 NPN 240-2222-000
RESISTORS
R1,2,3,4,15,17,19,21,48,43,70 1K 5% 1/4 Watt 242-0001-102
R5,35,38,68 10K 5% 1/4 Watt 242-0001-103
R6 390 Ohm 5% 1/4 Watt 242-0001-391
R7,51 22K 5% 1/4 Watt 242-0001-223
R8 150 Ohm 5% 1/4 Watt 242-0001-151
R9,36,66 47K 5% 1/4 Watt 242-0001-473
R10 56 Ohm 5% 1/4 Watt 242-0001-560
R11,12,13 4.7K 5% 1/4 Watt 242-0001-472
R14 39K 5% 1/4 Watt 242-0001-393
R16,18,20,22 33K 5% 1/4 Watt 242-0001-333
R23-30,40,41,44,45,50,72,73,76 100K 5% 1/4 Watt 242-0001-104
R31 100 Ohm 5% 1/4 Watt 242-0001-101
R32 27 Ohm 5% 1/4 Watt 242-0001-270
R33,34,52 470 Ohm 5% 1/4 Watt 242-0001-471
R37 2.7 Meg 5% 1/4 Watt 242-0001-275
R39,56 68K 5% 1/4 Watt 242-0001-683
R42 120K 5% 1/4 Watt 242-0001-124
R49 330K 5% 1/4 Watt 242-0001-334
R54,55,67 470K 5% 1/4 Watt 242-0001-474
R61,62 47 Ohm 5% 1/4 Watt 242-0001-470
R63,75 6.8K 5% 1/4 Watt 242-0001-682
R64 18K 5% 1/4 Watt 242-0001-183
R65 620 Ohm 5% 1/4 Watt 242-0001-621
R69 150K 5% 1/4 Watt 242-0001-154
R71 13K 5% 1/4 Watt 242-0001-133
R74 8.2K 5% 1/4 Watt 242-0001-822
POTENTIOMETERS
R47,53,57,58 25K Pot 242-0101-253
INTEGRATED CIRCUITS
U1 5 Volt Reg 417-7805-001
U2 Reset Generator 425-7757-000
U3 Quad Opto-Isolator 420-2501-000
U4 Microcontroller 425-1654-000
U5,6 Quad Op-Amp 420-L347-000
U7 Quad Analog Gate 412-4066-000
8
Warranty
CPI Communications, Inc. warrants each product manufactured by it to be free from defective material and
workmanship and agrees to remedy any such defects or to furnish a new part in exchange for any part of any unit
of its manufacture which under normal installation use or service discloses such defects, provided the unit is
delivered by the customer to our authorized service center intact, with all transportation charges pre paid within
two years from date of shipment to the original purchaser. Exceptions are semiconductors which carry only the
manufacturer's standard warranty and lamp indicators and fuses which are warranted to be operational when
shipped from the factory. No credit will be given for unauthorized repair.
This warranty does not extend to any of our products which have been subjected to misuse, neglect, accident,
incorrect wiring not our own, improper installation, or to use in violation of instructions furnished by us nor
extended to units which have been repaired or altered outside of our factory or authorized service center, nor to
cases where the serial number thereof has been removed, defaced, or changed, nor to accessories used therewith not
of our own manufacture, nor to finish or appearance items.
This warranty is in lieu of all other warranties expressed or implied and no person is authorized to assume for us
any other liability in connection with the sale of our products.
Please Note: CPI products are not authorized for use in applications where nonperformance may be life threaten-
ing, or where substantial risk to life and property may be present, without express written consent of the president
of CPI Communications, Inc. CPI Communications, Inc. shall never be liable for consequential or indirect
damages.
Reference Description CPI Part #
MISC.
V3,4 MOV 242-0119-330
Y1 Crystal 258-0002-002
Cord Modular Line Cord 600-0006-006
K1 DPDT Relay 230-0002-002
K2,3 SPDT Relay 230-0001-002
L3,4 150uH Choke 232-0000-150
T2 600:600 Transformer 246-0100-003
S1 4 Position Dip Switch 244-0002-004
-4W OPTION
R59,60 47 Ohm 5% 1/4 Watt 242-0001-470
C19,20 .01uF Mono Cer Dip 208-0092-103
V1,2 MOV 242-0119-330
-FD OPTION (-4W option must also be installed)
R46 470 Ohm 5%1/4 Watt 242-0001-471
T1 600:600 Transformer 246-0100-003
C7,8 4.7uF Elec Rad 100 Volt 208-2062-475
-
1
-
2
-
3
-
4
-
5
-
6
-
7
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