CPI TR Series User manual

1
TR Series
Tone Remotes
Rev.C
Instruction Manual
TR10 TR20
TR30 TR40

2
CONTENTS
Topic .....................................................Page #
Specifications .....................................................2
GeneralDescription ............................................3
Installation ...........................................................3
Jumpersettings ................................................... 4
Dipswitchsettings...............................................4
Circuit Analysis ................................................... 5
PartsList .............................................................5, 6, 7
ControlPanel PCB View......................................8
Control Panel PCB Schematic............................. 9
Main PCB View ...................................................10
Main PCB Schematic ..........................................11,12,13,14
ExternalAdjustments ...........................................15
Warranty............................................................. 16
SPECIFICATIONS Subject to change without notice.
PowerRequirements 120 VAC, 60 Hz for wall pack (provided) operation
12 VDC to 16 VDC @ 600 mA maximum. Fused on circuit board.
Dimensions 9" x 4" x 7" inches
Weight TR10 - 5 lbs, TR20 - 5 lbs, TR30 - 5 lbs, TR40 - 5 lbs.
Audio Output to Speaker 2 Watts at 3% THD into 8 ohms, using supplied wall pack or 12 VDC.
HandsetEarpieceLevel VolumeControlAdjustable.
FrequencyResponse +/- 3dB from 300 to 3000 Hz, except at notch freq. 1000 Hz reference.
Hum and Noise 50dBbelowoperatinglevels
Notch Filter 2175 Hz down 50 dB from 1000 Hz reference level.
Compression Less than 3 dB increase in output with 30 dB increase in input beyond
threshold. Threshold is adjustable from -20 dBm to +10 dBm.
LineImpedance 600 ohms or 5000 ohms, dip switch selectable.
Line Output Level Factory set at 0 dBm. Adjustable to +10 dBm maximum.
Control Tone Frequencies Security Tone: 2175 Hz +/- 0.01% @ +10 dBm for 140 mS.
FunctionTone: F1 1950 Hz +/- 0.01% @ 0 dBm for 40 mS.
F2 1850 Hz +/- 0.01% @ 0 dBm for 40 mS.
MonitorTone: 2050 Hz +/- 0.01% @ 0 dBm for 40 mS.
HoldTone: 2175 Hz +/- 0.01% @ -20 dBm for duration of PTT.
OperatingModes Standard:Twowiresimplex
Optional: Two wire duplex, four wire simplex and four wire duplex.

3
General Description
TheTRseries toneremotesare designed toprovideremote control ofaconventional ortrunkedtwoway radio
base station or repeater via a leased wire line, in-house twisted pair or RF link.
TheTRseriesisavailableinfourdifferent housing configurations.They are: theTR10telephone style unitwith
handset,theTR20desktopconsolewithdeskmicrophone,theTR30desktopconsolewithbuiltinelectretcondenser
microphoneand the TR40 desktop consolewith gooseneck microphone.
Standard features on all TR models include front panel PTT switch, LED transmit indicator, monitor function,
intercomfunction,twowattamplifiedspeakerwithvolumecontrol.
TheTR10,20,30and40maybewallmountedbyorderingthe-WMoption. WhenwallmountingtheTR20please
note, no provisions are made for mounting the desk microphone.
TRseries unitsare normallypowered bythe suppliedwall plug-intransformer. Themay alsobe poweredfrom
a 12 volt DC source by removing the wall pack and making the appropriate DC connections to TB1.
Installation
TheTRseriestoneremoteswillworkwithanyremotesystemusingtheEIAstandardtonecontrolformat.They
are designed with protection against both power and telephone line surges. This protection circuitry requires a
properlygroundedACoutletbeusedtopowerthewallpack.IftheremoteistobepowereddirectlyfromDC,awell
grounded 12 to 16 volt DC supply is required.
Phone lines - The TR series is designed to work with a good quality leased voice grade pair (phone line) or in
house twisted pair wiring.
Paralleloperation-Whenseveralremotecontrolunitsareconnectedinparallelthetotalsystemimpedancewill
decreasetoapointwhereoperationisdegraded.Thisoccurswhenthreeormoreremotesareconnectedinparallel.
Tocompensateforthiseffect,TRseriesremotesprovideaswitchselectable600ohmor5000ohmimpedeance.
Inparallelremoteinstallationsusingthesamephoneline,dipswitch1shouldbeintheOFFposition(5000ohms),
inallremotesexceptthelastoneinthechain.Formulti-pointinstallationsusing morethanonephonelinetheabove
procedure applies to each phone line.
UptotenTRseriestoneremotesmaybeconnectedinparallel.Themaximumlossbetweenanyremoteandthe
terminationpanelmustnotexceed20db.
LevelSetting
Thefollowingadjustmentsassumethattheterminationpanelhasbeenproperlyinstalled.
LineInput-Thereceivelineinput,R89,adjuststheaudioleveltotheinputofthecompressionamplifiercircuitry.
This allows the threshold of compression be adjusted from -20 dBm to +10 dBm.
While applying an RF signal modulated with a 1000 Hz tone at 60% system deviation to base station receiver,
adjust the termination panel line output control for 0 dbm to the phone line. Adjust each remote as follows:
a. Connect a scope or analog AC volt meter to ground and pin 14 of U2.
b.WithR89fully clockwise,adjust inacounter-clockwisedirectionuntil theAC voltagelevelonscope(approx.
1Vpeak topeak) ormeter (approx.360 mVrms) juststops increasing.This pointis thethreshold of compression.
c. Remove the RF Signal from the base station.
Line Out - This level is preset at the factory for 0 dbm out to the phone line and may not require readjustment
at installation. If needed, the procedure is as follows:
1.With thehandsetoff-hook, ifapplicable,depress theintercomswitch andadjustthe modoutpot (R63)while
speaking in a normal voice until 0 dbm is measured across the phone line at the termination panel.
2.Movedipswitch7totheonpositionandkeytheremote.AdjustR80(ToneLevel)untilthe1950Hzfunctiontone
measures 0 dBm across the phone line at the termination panel.
Notch filter -The2175Hznotch filter isfactorytunedandshould not needreadjustment exceptintheeventof
repair. Adjustment procedure is as follows:
a. Apply a 0 dBm, 2.2Vpp, 2175 Hz signal across the red and green phone line inputs.
b. Using a dual channel scope in the X-Y mode, connect one probe to pin 14 of U2, the other to pin 8 of U3.
c. Adjust R39 until the lissajous pattern on the screen closes to a flat line. Remove probes.
d.Withthescopeinthesinglechannelmode,connectprobetopin14ofU3.AdjustR38toobtainminimumsignal

4
level on the scope. Readjust R39 slightly to further reduce signal level. Recheck R38 then R39. Notch will be
approximately58dBdeep.
Microphone Sensitivity - R75 controls the microphone audio level into the transmit compression circuit and
thereforeactsasasensitivitycontrol.Thispotentiometerhasbeenfactorysettoprovideadequatecompressionfor
normalvoice audiowith arelatively quietbackground noise level.
JumperSettings
The TR series circuit board has 9 "Dot" jumpers. These jumpers are "in" if there is a solder short across it and
"out"ifthereisnot.Table1liststhejumpersbynumberandexplainstheirfunction. Factorysettingsareunderlined.
Table 1
Dip Switch Settings
Table 2 describes the functions provided by the dip switch on the bottom of the unit. The factory setting are
underlined.
Table 2
Switch # ON OFF
1600 ohm termination 5000 ohm termination
2TR 10 (Does not affect TR30 or TR40) TR20 (Does not affect TR30 or TR40)
3 TR30 or TR40 TR10 or TR20
4 TR20 TR10, TR30 or TR40
5Allows volume to be turned down
completely. Prevents volume from being turned down
completely.
6TR20, TR30 or TR40 - SPKR always ON TR10 - SPKR mute with handset off-hook
7Locks up function tone (0 dBm) Normal operation
8 Disables tone attenuation (All tones at +10
dBM) Normal operation
JP# IN OUT
1For 2 wire operation. For 4 Wire or FD operation.
2For 4 Wire or FD operation. For 2 wire operation.
3For 2 wire operation. For 4 Wire or FD operation.
4For FD operation. For Non-FD operation.
5For FD operation. For Non-FD operation.
6Normal boom/panel mic gain. Increased boom/panel mic gain.
7Three to ten frequency models. One and two frequency models.
8Three to ten frequency models. One and two frequency models.
9Three to ten frequency models. One and two frequency models.

5
CircuitAnalysis
ReceiveAudioPath
ReceiveaudiofromthephonelineentersthroughtransformerT1.ThecontrolforReceivelineinput,R89,adjusts
thesignal levelpassed totheremaining receiveaudio circuitry.This signal iscoupled throughaudio gateU9-B to
the compression amplifier formed by U2-A, B and C. The compression amplifier operates by sampling the output
of U2-C through C5 and R32 and then rectifying it with D1 and D2. The rectified DC voltage, which varies as the
receiveaudiolevelvaries,controlstheimpedanceofQ2.ThevaryingimpedanceofQ2controlsthesignallevelinput
to U2-B. C6 and R8 control the compressor attack and decay time. U2D and it's associated circuitry form a high
pass audio filter which reduces 60 Hz components by as much as 40 db.
The compressor output is passed to the notch filter through R19. The notch filter is made up of U3, sections A,
B,C and D,andtheir associatedcomponents.It is tunedtothe notchfrequencyby adjusting R39andR38. When
properlytuned,the2175Hzcomponentoftheaudiosignalisreducedbyasmuchas50db.Theoutputofthenotch
ispassed to the front panelvolume controlthrough audiogate U9-A. Padded output audiois gatedthrough U6-C
tothereceiveaudioamplifiersU4andU5.LowlevelaudioforthehandsetearpieceisprovidedbyU7-Dandadjusted
by R96. It is then gated through U6-B, buffered by U7-C and sent to the handset.
TransmitAudioPath
Miclevel audiois fedto preampU7-A orU7-B, dependingon whichmic is used. Preamplified transmitaudio is
routedthroughaudiogateU6-AorU6-D,dependingonwhichmicisused,tothemicleveladjustmentR75.R75sets
thesignallevelpassedtothecompressionamplifierformedbyU2.Thecompressionamplifieroperatesbysampling
theoutputofU2-CthroughR32andC5andthenrectifyingitwithD1andD2.TherectifiedDCvoltage,whichvaries
asthetransmitaudio level varies,controlstheimpedanceofQ2.ThevaryingimpedanceofQ2controlsthesignal
levelinputtoU2-B.C6andR8controlthecompressorattackanddecaytime.U2-Dandit'sassociatedcircuitryform
a high pass audio filter which reduces 60 Hz components by as much as 40 dB.
The compressor output is passed to the notch filter through R19. The notch filter is made up of U3, sections A,
B,C and D,andtheir associatedcomponents.It is tunedtothe notchfrequencyby adjusting R39andR38. When
properlytuned,the2175Hzcomponentoftheaudiosignalisreducedbyasmuchas50db.Theoutputofthenotch
isgatedthroughU9-D and fedtothephonelinedrivercircuitofU10-AandU10-C.U10-AandU10-Cformapush-
pull amplifier to drive transformer T1.
TransmitMode
WhenthePTTlineisgrounded,pin24ofU17sensesthegroundandprovidestimedlogichighoutputsfrompins
10and11enablingaudiogatesU11-BandU11-C.U12simultaneouslypassesa16bitdigitalwordtothemonolithic
sine wave generator U12 determining the frequency to be output to control tone amplifier U13. The control tone
amplificationisadjustedbyR80.AmplifiedcontroltonesfromU13-BarefedtothephonelinedrivercircuitofU10-
AandU10-C.U10-AandU10-Cformapush-pullamplifiertodrivetransformerT1.Simultaneously,pins12,13and
14 of U17 are manipulated to control transmit and receive audio gating through control lines 1, 2 and 3.
Parts List
TR Series main PCB #700-DRBB-200 Rev. B
Reference Description CPI Part #
CAPACITORS
C5, 6 1uF Elec Rad 208-4052-105
C7,14,27,37,39,40,44,48,53,60 .1uF Mono Cer Dip 208-0092-104
C8 470pF Cer Disc 208-0002-471
C9 .47uF Elec Rad 208-4052-474

6
Reference Description CPI Part #
C10,11 .01uF 1% Mono Cer Dip 208-0071-103
C12,28,45,46 220uFElec Rad 208-2021-227
C13,17 4.7uF Elec Rad 208-4042-475
C15,16,41,55,56,59,65,67 .1uF Mono Cer Dip 208-0092-103
C22,23,24,54 .033uFMetMylar 208-0212-333
C25 2200pF 208-0071-103
C26 220uF Elec Rad NP 208-2031-227
C32,33 4.7uF Elec Rad 208-2062-475
C36,50,52,57 100uFElec Rad 208-2021-107
C38 22uF Elec Rad 208-2022-226
C42 47pF Mono Cer Dip 208-0071-470
C43 180pF Mono Cer Dip 208-0071-181
C47 1000uFElecRad 208-2031-108
C49,51,58 2.2uF Elec Rad 208-4052-225
C61,62 20pF Cer Disc 208-0001-200
C63 10pF Cer Disc 208-0001-106
DIODES
D1,2,12 1N4148 212-0001-001
D7 1N4746 212-0100-019
D8,9,10,11 1N4004 212-0002-004
D13 1N4935A 212-0100-008
TRANSISTORS
Q2,10,11 2N2222NPN 240-2222-000
Q4 MJE521NPN 212-0001-002
Q5,6,7,8,9 2N2907PNP 242-2907-000
RESISTORS
R7,32,36,49,82,97,102,119,123,125 1K 1/4W 5% 242-0001-102
R8 1.8M 1/4W 5% 242-0001-185
R9,11,35,37,69,77,78,79,81,95,103,104, 10K 1/4W 5% 242-0001-103
106,115,116,120
R10,20,23,34,42,71,100,105,109 100K 1/4W 5% 242-0001-104
R12,14,17,18 10.0K 1/4W 1% 242-0014-100
R13 6.81K 1/4W 1% 242-0013-681
R15,74 7.32K 1/4W 1% 242-0013-732
R16,19 44.2K 1/4W 1% 242-0014-442
R21 22K 1/4W 5% 242-0001-223
R30 6.8K 1/4W 5% 242-0001-682
R31 220K 1/4W 5% 242-0001-224
R33 1.2K 1/4W 5% 242-0001-122
R40,70 3.9K 1/4W 5% 242-0001-392
R41,43,44,111 2.7 1/4W 5% 242-0001-027
R47 560K 1/4W 5% 242-0001-564
R64 5.1K 1/4W 5% 242-0001-512
R65,62,86 27K 1/4W 5% 242-0001-273
R66,67 68K 1/4W 5% 242-0001-683
R68,73 100 1/4W 5% 242-0001-101
R72,84,126,127 18K 1/4W 5% 242-0001-183
R74 1M 1/4W 5% 242-0001-105
R83 150K 1/4W 5% 242-0001-154
R85 62K 1/4W 5% 242-0001-623
R87,88 620 1/4W 5% 242-0001-621
R90 220 1/4W 5% 242-0001-221
R91 17.4K 1/4W 1% 242-0014-174

7
Reference Description CPI Part #
R92 3.3K 1/4W 5% 242-0001-332
R93 240K 1/4W 1% 242-0015-240
R98,99,110,122,124 47K 1/4W 5% 242-0001-473
R107,108,113,114 120K 1/4W 5% 242-0001-124
R112 39K 1/4W 5% 242-0001-393
R117 200K 1/4W 5% 242-0001-204
R118 82K 1/4W 5% 242-0001-823
R121 12K 1/4W 5% 242-0001-123
R128 4.7K 1/4W 5% 242-0001-472
RN1 ResistorNetwork100Kx9 242-0117-104
POTENTIOMETERS
R38,39 1K Multi-turn VertAdj 242-0104-102
R63 250K Single turn Vert Adj 242-0101-254
R75 5K Single turn Vert Adj 242-0101-502
R76,89,96 25K Single turn Vert Adj 242-0101-253
R80 10K Single turn Vert Adj 242-0101-103
INTEGRATEDCIRCUITS
U2,3,7,10,13,14 QuadBi-FETOp Amp 420-L347-000
U4,5 AudioPower Amp 420-0380-000
U6,9,11 QuadBilateralSwitch 420-4066-000
U12 ToneGenerator 420-2035-000
U15 QuadLowPowerOpAmp 420-0324-000
U16 UnderVoltageSensor 425-7757-000
U17 Micro-Controller 425-1655-000
MISC.
J2 (TR10) HandsetJack 228-0041-010
J2 (TR20) Desk Mic Jack 228-0041-186
J3 Mod Jack Bottom Entry 228-0041-026
J4 HeaderShrouded 26Position 228-0101-001
L1, L2, L3, L4 150uHChoke 232-0000-150
V1, V2, V3, V4 MOVERZC05DK33026V 242-0119-241
S1(TR10) HookSwitch 244-0100-009
S2 8Position Dip Switch 244-0002-008
T1 TransformerAudio600:600 246-0100-003
Y1 Crystal4Mhz 258-0002-002
TR series Top PCB #700-00FP-200 revision C
D1,D3 LED Green Dot 214-0005-002
D2 LED Red Dot 214-0003-001
R1 10KVolumePot 242-0115-103
LS1 8OhmOval 234-0001-004
S1,S2,S4 PushButton Switch,Black 244-0030-000
S3 PushButtonSwitch,Red 244-0030-002
X1 (DR10 & DR30) ElectretMicrophone 234-0002-004
X1 (DR40) GooseneckMicrophone 234-0003-003
26positioncable assembly 600-0TSR-025

1993C
S/N
COMMUNICATIONS
CPI
REV C
700-00FP-200
FRONT PANEL
J1
R1 JP1
S2
S3
S4
S1
LS1
D2
D3
D1
X1
1993C
S/N
COMMUNICATIONS
CPI
REV C
700-00FP-200
FRONT PANEL
J1
R1 JP1
S2
S3
S4
S1
LS1
D2
D3
D1
X1
Component Side
Solder Side
8
PCB View - Control Panel #700-00FP-200

A
A
B
B
C
C
D
D
E
E
44
33
22
11
Monday, September 18, 1995
C
Control Panel - DR, LE & TR Series
A
1
Title Size
Document Number
Rev
Date:
Sheet of
S1 KS11R9
D3 LED GRN
X1 WM54BT
LS1
SPEAKER
D1 LED GRN
D2 LED RED
S2 KS11R9
S3
KS11R3
JP1 HEADER 5
1 2 3 4 5
S4 KS11R9
J1 CON26A
1 3 5 7 9 11 13 15 17 19 21 23 25
2 4 6 8
10 12 14 16 18 20 22 24 26
R1
10K POT
PTT
PTT
VCC
VCC
THIS PART IS LOCATED OFF-BOARD.
WHT GRN VIO
ORG
BLK
THIS PART IS LOCATED OFF-BOARD.
FRONT PANEL MIC
ENCODER INPUT
PTT
F1 / F2
PTT
F1
F2
INTERCOM
MONITOR
CPI Communications, Inc.
9

Q3
R22
Q2
C5
CPI COMMUNICATIONS,INC.
C1
C17
C16
C13
C15
C14
R21
R20
C12
R17
J1
J2
C11
C10
C9
C7 C8
R9
R10
R11
D2
C6
D1
R4
R5
R6
R7
R8
C3
C4
R1
R2
R3
Q1 C2
U5
R43
R23
C26
U4
R18
R19
R15
R16
U3
R12
R13
R14
R
R34
R35
R36
R32
R33
W
NO
U2
R30
R31
D3
C18
U1
R46
R44
R45
C28
C27
U6 R42
R41
R39
C25
R38
37
C24
S1
C23
NC
R29
D4
C22
R26
R27
R28
C
R24
R25
TR SERIES
R49
D6
D5
R47
R74
R126
C41
C40
R40
R127
C37
C36
J3
C32
C21
T1
R53
C19
C20
R52
R54
1994
R51
R75
R73
R68
R69
R70
R71
R72
R64
R65
R66
R67
C38 C39
R63
L2
L3
L4
C33
C34
L1
JU1
R61
R62
JU2
R50
C29
700-TRBB-200
R80
JU6
C42
R78
R77
R76
C66
C65
V2
V3
V4
C35
C64
V1
C31
JU3
JU4
R57
R58
R59
R60
R55
R56
C30
R96
R94
U7
R91
R92
R93
R79
C43
C44
C67
R88
JU5
R83
R84
R85
R86
R87
R81
R82
T2
U9
U8
C45
R110
R109
R95
U13
S2
C55
R90
R89
U10
D12
C52
C51
C48
F1
D10
D8
D7
REV C
R111
U14
C57
C56
R108
U11
R106
R107
R105
U12
C53
R102
R103
R104
Q5
R99
R100
R101
C49
R97
C46 C47
Q4
S/N
Q10
R121
C59
R119
R120
C58
R128
C54
U17
U16
R98
D11
C50
D9
Q11
C60
R118
D13
Q9
R115
R116
R117
Q8
R113
R114
JU9
JU7
C61
RN1
R112
Q7
Y1
Q6
U15
TB1
J4
JU8
C62
C63
R123
R124
R125
R122
PCB View for Main PCB #700-LEBB-200, Rev. C
10