Daniels UR-4E380-00-000 Instruction Manual Download Page 31

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MT-4E VHF & UHF Receiver & Transmitter Instruction Manual

IM08-MT-4E-TXRX-P1162

VHF and UHF Parts List

vHF / uHF tRanSMIttER ElECtRICal PaRtS lISt

Part Number

Description

Product

Qty

A21-TX4E-MAIN-01

TX, MB ASSY, MT-4E, INCL UDB

ALL

A11-UDB

UNIVERSAL DAUGHTER BOARD

ALL

A21-VPA155-08

TX POWER AMP, VHF130-180 MHz

VHF

A23-UPA450-08

TX POWER AMP, UHF 380-512 MHz

UHF

A64-OT4-150

SYNTHESIZER, TX, VHF,136-174

VHF

A64-OT4-380

SYNTHESIZER, TX/4E,UHF,380-406

UHF (380-406)

A64-OT4-440

SYNTHESIZER, TX, UHF,406-470

UHF (406-470)

A64-OT4-500

SYNTHESIZER, TX, UHF,470-520

UHF (470-520)

vHF / uHF tRanSMIttER MECHanICal PaRtS lISt

Part Number

Description

Product

Qty

A89-MIC4-08

CABLE/CONN ASSY,MICROPHONE CON

ALL

7910-WP0WP011

CABLE,SMB PLUG-PLUG,RG316,11cm

ALL

3702-62502010

CASE, 14HP RF PLUG-IN, MT-3 TX

ALL

3702-10000120

FASTENER, QUICK RELEASE, GRAY

ALL

5630-12023250

GASKET, BeCu,3FINGER,.71",CLIP

ALL

3702-10000614

HANDLE, FRONT PANEL, 14HP,GREY

ALL

5671-250N062B

HOLE PLUG, .250" HOLE,NYL.,BLK

ALL

5783-15110977

INSULATOR,2.56" x 2.27",MYLAR

ALL

3536-10111405

LABEL/LEXAN, 14HP, VHF: RED

VHF

3536-10131410

LABEL/LEXAN,14HP,UHF/SM: BLACK

UHF

5814-3M0LK00S

LOCKWASHER, M3, SPLIT,A2 STEEL

ALL

3702-10001214

NAMEPLATE, BLANK, 14HP, ALUM.

ALL

5813-2M5SQ50S

NUT, M2.5, SQUARE-5mm, A2 S/S

ALL

3702-63002101

PANEL, REAR,POS.4,14HP EXTRSN.

ALL

3802-61002121

PANEL/FRONT, W/IDENT: MT-4E TX

ALL

5812-2M5PP12S

SCREW, M2.5 x 12 PAN/PHIL, A2

ALL

5812-2M5FP14S

SCREW, M2.5 x 14 FLAT/PHIL, A2

ALL

5812-2M5PP06S

SCREW, M2.5 X 6, PAN/PHIL., A2

ALL

5812-3M0PP06S

SCREW, M3 X 6, PAN/PHILLIPS,A2

ALL

5812-3M0PP08T

SCREW, M3 x 8, PAN/PHIL, BLACK

ALL

5812-3M0VP08S

SCREW, M3 x 8,OVAL C/S/PHIL,A2

ALL

5812-5M0FP08S

SCREW, M5 x 8, FLAT/PHIL., A2

ALL

vHF / uHF tRanSMIttER P25 dIGItal FIRMWaRE

Part Number

Description

Product

Qty

APP-FIRM02-W-XX

DIGITAL UPGRADE FIRMWARE, MT-4E TX

ALL

Summary of Contents for UR-4E380-00-000

Page 1: ...niels Electronics Ltd and DE logo are trademarks of Daniels Electronics Ltd Document Number Revision Revision Date Daniels Electronics Ltd Victoria BC PRINTED IN CANADA MT 4E vhf UHF receiver Transmitter instruction manual 136 174 MHz 380 406 MHz 406 470 MHz 470 520 MHz 768 869 MHz 896 960 MHz Covers Models VR 4E150 00 000 UR 4E768 00 000 VR 4E150 A0 000 UR 4E800 00 000 UR 4E380 00 000 UR 4E850 00...

Page 2: ...on of the device NOTE DOCUMENT REVISION DEFINITION Daniels Electronics Ltd utilizes a three level revision system This system enables Daniels to identify the significance of a revision Each element of the revision number signifies the scope of change as described in the diagram below Major Revisions The result of a major change to product function process or requirements Minor Revisions The result...

Page 3: ...rs of the public Such access can be restricted or controlled by appropriate means i e fences warning signs etc The FCC and IC s limits apply cumulatively to all sources of RF emissions affecting a given site Sites exceeding these limits are subject to an EA and must provide test reports indicating compliance RF Safety Guidelines and Information Base and Repeater radio transmitters are designed to ...

Page 4: ...MT 4E VHF UHF Receiver Transmitter Instruction Manual IM08 MT 4E TXRX P1162 iv This Page Intentionally Left Blank ...

Page 5: ...umpers 14 Front Panel RJ45 Jack Pinouts 14 Receiver Troubleshooting 15 Transmitter Troubleshooting 18 System Troubleshooting 20 48 Pin Motherboard Interface Connector 21 VHF and UHF Parts List 23 VHF UHF Receiver Electrical Parts List 23 VHF UHF Receiver Mechanical Parts List 24 VHF UHF Receiver P25 Digital Firmware 24 VHF UHF Receiver and Transmitter Encryption 24 VHF UHF Receiver and Transmitter...

Page 6: ...rts 33 700 800 900 MHz Transmitter P25 Digital Firmware 33 Specification Data Sheets 35 VHF and UHF Receiver Performance Specifications 37 380 406 MHz Receiver Performance Specifications 39 430 450 MHz Receiver Performance Specifications 41 VHF and UHF Transmitter Performance Specifications 43 VHF and UHF Physical Specifications 44 380 406 MHz Transmitter Performance Specifications 45 380 406 and ...

Page 7: ...ith all Daniels subrack and base station enclosures It supports a basic analog interface and may be used in a mixed system with MT 3 and MT 4 series receivers and transmitters P25 Digital Mode When the P25 firmware upgrade is purchased the MT 4E family of receivers and transmitters may be configured for P25 Digital operation or mixed mode operation In a repeater configuration the receiver passes t...

Page 8: ... keys for all modules in a system with a single key press of the switch marked ZEROIZE KEY The CI BC 4E Base Controller can also be used to control whether the transmitter outputs a secure or a clear signal Firmware Upgrades Receiver and transmitter firmware upgrading is performed with the PC based firmware flashing software A USB Type A to 5 pin Mini B cable is used to connect the USB port of an ...

Page 9: ... the states of the bank and channel select lines Note that the channel select lines follow a binary pattern but that the binary 0 represents Channel 1 The Bank A B select line normally floats high 5 V selecting Bank A but may be pulled low or high externally via the Bank A B select line BANK A B CSEL 3 CSEL 2 CSEL 1 CSEL 0 BANK SELECTED CHANNEL SELECTED HI LO LO LO LO A 1 HI LO LO LO HI A 2 HI LO ...

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Page 11: ...emo version click Help to access the help files Receiver and transmitter programming is performed with the PC based RSS A USB Type A to 5 pin Mini B cable included with the software is used to connect the USB port of an IBM compatible computer to the USB port on the front panel of the receiver or transmitter module The RSS allows the receiver or transmitter to be programmed for operating frequenci...

Page 12: ...ogramming Mode Programming options are divided into two categories Global Settings and Channel Settings When the receiver or transmitter menu is selected from the main screen both the global and channel settings for the current channel are displayed The RSS may be used to save a receiver or transmitter configuration to disk This function allows the user to save a standard configuration and use it ...

Page 13: ...peration occurs as follows 1 The receiver determines whether an incoming signal is analog or digital and asserts either the ANALOG COR or DIGITAL COR signal line on the front panel RJ45 CNTL BUS connector LVDS Serial Data is sent to the RJ45 CNTL BUS connector as well 2 The COR signal and LVDS Serial Data are transferred over the Radio Interconnect Cable directly to the transmitter or are routed t...

Page 14: ... the system along with the base controller The audio control card or the base controller will also allow for repeat capability of the system using analog audio as the repeat path The base controller is used for system control of encryption and decryption of the P25 Digital voice messages Optional decryption or encryption modules are required in the receiver and transmitter modules Digital Fixed Ba...

Page 15: ...P1162 9 VHF UHF Receivers and Transmitters The following section provides information that is primarily for VHF UHF receiver and transmitter modules For specific information on 700 800 900 MHz receiver and transmitter modules see the 700 800 900 MHz section in this manual ...

Page 16: ...MT 4E VHF UHF Receiver Transmitter Instruction Manual IM08 MT 4E TXRX P1162 10 This Page Intentionally Left Blank ...

Page 17: ...ot be removed or replaced using an ordinary soldering iron Removal and replacement of surface mount components should be performed only with specifically designed surface mount rework and repair stations complete with Electrostatic Discharge ESD protection When removing surface mount solder jumpers it is recommended to use solder wick braid in place of vacuum type de soldering tools This will help...

Page 18: ...uments 2965A or equivalent Communications Service Monitor P25 Digital and Analog IFR 2975 Alignment Tools Daniels A TK 04 It is recommended that the radio communications test set be frequency locked to an external reference WWVH GPS Loran C so that the high stability local oscillator may be accurately set Complete Receiver and Transmitter Alignment A complete receiver and transmitter alignment is ...

Page 19: ...Gain by 2 7 dB JU13 OUT Disable 600 Ω Audio Output Enable Low Impedance Audio Output JU14 X Balanced Audio Transformer X Active Y Bypass JU15 OUT For factory testing purposes only power to coax for RF Preselector JU16 IN Isolate IF Filter Stage JU17 IN For factory testing purposes only RX Main to DSP on UDB JU18 IN For factory testing purposes only RX Main to DSP on UDB JU19 IN For factory testing...

Page 20: ... Transformer Y Bypass Transformer JU8 X X 600 Ω Audio Transformer Y Bypass Transformer JU9 OUT When installed bypasses AC coupling on the Subtone Direct Modulation input JU10 X X ENCRYPT MT4E XX Y ENCRYPT MT4E XX1 Selects which UCM installed JU11 OUT Changes gain for TCXO MOD input to synthesizer JU12 X X Direct MOD input Y Spare Select source for the Spare input JU13 X X Spare Y DSP Bypass Select...

Page 21: ...to the NORM position 2 Check that the two front panel LEDs both turn ON for less than five seconds and then turn OFF If this is not the case the most likely fault is on the UDB on the synthesizer or on the receiver mainboard Make sure that the UDB and the synthesizer module are properly seated on the receiver mainboard 3 Connect the receiver to the PC with the USB cable and run the Radio Service S...

Page 22: ... 1 8 VDC 5 TP57 2 5 VDC supply 2 5 VDC 5 TP58 5 0 VDC supply 5 0 VDC 5 Test Points are shown on the VHF UHF Receiver Jumper and Test Point Locator Illustrations If the test point voltages are within the specified range the following tests further verify that the receiver mainboard may not be the source of problem Apply a 30 dBm IF signal of the frequency specified see the VHF and UHF Receiver Perf...

Page 23: ...he RF Preselector and connect the synthesizer LO output to a radio communication test set Confirm that the synthesizer LO frequency matches the Target Synthesizer RF OUT found in the Reference Oscillator field of RSS Service mode The LO output should be approximately 7 dBm The frequency of the synthesizer LO output will be above or below the receiver frequency by the IF frequency see the VHF and U...

Page 24: ...ications test set Testing the Transmitter 1 Flip the transmitter front panel NORM OFF KEY TX switch from the OFF position to the NORM position 2 Check that the two front panel LEDs both turn ON for less than two seconds and then turn OFF If this is not the case or the transmitter is not functioning properly the following steps can be taken 3 Connect the transmitter to the PC with the USB cable 4 R...

Page 25: ...ccess the UDB the amplifier sub assembly and the shield lid covering the UDB will need to be removed Test Point Signal Monitored Typical Voltage TP1 Ground 0 VDC TP2 Logic power 3 3 VDC 5 TP3 DSP core supply 1 2 VDC 5 TP4 CPLD core supply 1 8 VDC 5 Test Points are shown on the VHF UHF Transmitter Jumper and Test Point Locator Illustrations If the UDB voltages are not within the specified tolerance...

Page 26: ...he amplifier with a 0 dBm RF signal Check that the RF power output is 8 0 W when the front panel switch is set to KEY TX System Troubleshooting If the radio system is not receiving or transmitting on the right frequency check the Channel and Bank Select lines of the receiver and transmitter modules The motherboard has jumpers that allow one of 16 channels to be selected on a receiver or transmitte...

Page 27: ... RSSI O P Z24 RX Mode O P D26 Channel Select 3 MSB I P B26 Balanced Audio 1 O P Z26 Balanced Audio 2 O P D28 No Connect B28 Mute I P Z28 No Connect D30 No Connect B30 Ground Z30 Ground D32 No Connect B32 Ground Z32 Ground Transmitter Pin Name Pin Name Pin Name D2 No Connect B2 13 8 VDC I P Z2 13 8 VDC I P D4 No Connect B4 Microphone Audio Output O P Z4 Microphone Audio Input I P D6 No Connect B6 9...

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Page 29: ... 406 MHz UHF 380 406 1 A13 FE4 420 RF PRESELECTOR CLASS B 406 430 UHF 406 430 CLASS B 1 A13 FE4A 420 RF PRESELECTOR CLASS A 406 430 UHF 406 430 CLASS A 1 A13 FE4 440 PRESELECTOR 4E 430 450 MHz UHF 430 450 1 A13 FE4 460 RF PRESELECTOR CLASS B 450 470 UHF 450 470 CLASS B 1 A13 FE4A 460 RF PRESELECTOR CLASS A 450 470 UHF 450 470 CLASS A 1 A13 FE4 500 RF PRESELECTOR CLASS B 470 520 UHF 470 520 CLASS B...

Page 30: ...2 10001214 NAMEPLATE BLANK 14HP ALUM ALL 1 5813 2M5SQ50S NUT M2 5 SQUARE 5mm A2 S S ALL 2 3702 63001101 PANEL REAR POS 1 14HP EXTRSN ALL 1 3802 61001082 PANEL FRONT W IDENT MT 4E RX ALL 1 5812 2M5PP12S SCREW M2 5 x 12 PAN PHIL A2 ALL 1 5812 2M5FP14S SCREW M2 5 x 14 FLAT PHIL A2 ALL 2 5812 2M5PP06S SCREW M2 5 X 6 PAN PHIL A2 ALL 4 5812 2M5VP08S SCREW M2 5x8 OVAL C S PHIL A2 ALL 1 5812 3M0PP08T SCRE...

Page 31: ... QUICK RELEASE GRAY ALL 4 5630 12023250 GASKET BeCu 3FINGER 71 CLIP ALL 2 3702 10000614 HANDLE FRONT PANEL 14HP GREY ALL 1 5671 250N062B HOLE PLUG 250 HOLE NYL BLK ALL 1 5783 15110977 INSULATOR 2 56 x 2 27 MYLAR ALL 1 3536 10111405 LABEL LEXAN 14HP VHF RED VHF 1 3536 10131410 LABEL LEXAN 14HP UHF SM BLACK UHF 1 5814 3M0LK00S LOCKWASHER M3 SPLIT A2 STEEL ALL 4 3702 10001214 NAMEPLATE BLANK 14HP ALU...

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Page 33: ...RX P1162 27 700 800 900 MHz Receivers and Transmitters The following section provides information that is primarily for 700 800 900 MHz receiver and transmitter modules For specific information on VHF and UHF receiver and transmitter modules see the VHF and UHF section ...

Page 34: ...MT 4E VHF UHF Receiver Transmitter Instruction Manual IM08 MT 4E TXRX P1162 28 This Page Intentionally Left Blank ...

Page 35: ... OUT Enable Pullup Resistor on COR JU9 X Balanced Audio Transformer X Active Y Bypass JU10 X Balanced Audio Transformer X Active Y Bypass JU11 IN Enable Power to Balanced Audio Amplifier JU12 OUT Increase Balanced Audio Gain by 2 7 dB JU13 OUT Disable 600 Ω Audio Output Enable Low Impedance Audio Output JU14 X Balanced Audio Transformer X Active Y Bypass JU15 X X Synchronous Y Asynchronous JU16 X ...

Page 36: ...en installed bypasses AC coupling on the Subtone Direct Modulation input JU10 X X ENCRYPT MT4E XX Y ENCRYPT MT4E XX1 Selects which UCM installed JU11 OUT Changes gain for TCXO MOD input to synthesizer JU12 X X Direct MOD input Y Spare Select source for the Spare input JU13 X X Spare Y DSP Bypass Select source for the Spare input JU14 OUT When installed disables AC coupling of direct MOD input Inst...

Page 37: ...F PLUG IN MT 3 RX 1 3702 10000120 FASTENER QUICK RELEASE GRAY 4 5630 12023250 GASKET BeCu 3FINGER 71 CLIP 2 3702 10000614 HANDLE FRONT PANEL 14HP GREY 1 3702 33160011 HOLDER PCB EXTRACTOR DIE CAST 1 5671 250N062B HOLE PLUG 250 HOLE NYL BLK 1 5783 15110977 INSULATOR 2 56 x 2 27 MYLAR 1 3536 10151405 LABEL LEXAN 14HP UHF BLUE 1 5814 3M0LK00S LOCKWASHER M3 SPLIT A2 STEEL 4 3702 10001214 NAMEPLATE BLA...

Page 38: ...UPGRADE FIRMWARE MT 4E RX ALL 1 700 800 900 MHz Receiver and Transmitter Encryption Part Number Description Product Qty ENCRYPT MT4E XX ENCRYPTION MODULE MT 4E RX TX ALL 1 700 800 900 MHz Receiver and Transmitter RSS Part Number Description Product Qty APP RSS03 WC XX RADIO SERVICE SOFTWARE MT 4E ALL 1 Part Number Description Qty 5812 2M5PP06S SCREW M2 5 X 6 PAN PHIL A2 4 5812 2M5VP08S SCREW M2 5x...

Page 39: ...00S LOCKWASHER M3 SPLIT A2 STEEL 4 3702 10001214 NAMEPLATE BLANK 14HP ALUM 1 5813 2M5SQ50S NUT M2 5 SQUARE 5mm A2 S S 2 3702 63002101 PANEL REAR POS 4 14HP EXTRSN 1 3802 61002121 PANEL FRONT W IDENT MT 4E TX 1 3702 64202050 PLATE ASSEMBLY 8W AMP ALUM 1 5812 2M5PP12S SCREW M2 5 x 12 PAN PHIL A2 2 5812 2M5FP14S SCREW M2 5 x 14 FLAT PHIL A2 2 5812 2M5PP06S SCREW M2 5 X 6 PAN PHIL A2 4 5812 3M0FP06S S...

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Page 41: ...XRX P1162 35 Specification Data Sheets This section contains detailed specifications for RF modules within the scope of this manual To verify performance and set up test procedures please refer to these data sheets when performing technical operations on the equipment ...

Page 42: ...MT 4E VHF UHF Receiver Transmitter Instruction Manual IM08 MT 4E TXRX P1162 36 This Page Intentionally Left Blank ...

Page 43: ...mpedance 50 Ω Type N connector Frequency Generation Internal Synthesizer Reference Sensitivity 118 dBm 0 28uV for 12 dB SINAD 118 dBm 0 28uV for 5 BER Local Oscillator Frequency Stability 1 0 ppm VHF 0 5 ppm UHF Adjacent Channel Rejection Selectivity Class A 45 dB Narrow band Analog 75 dB Wide band Analog 60 dB Digital Class B 40 dB Narrow band Analog 70 dB Wide band Analog 60 dB Digital Intermodu...

Page 44: ...pply Current Class A 250 mA with no encryption module installed 280 mA with encryption module installed Class B 115 mA with no encryption module installed 145 mA with encryption module installed Operating Temperature Range 30 C to 60 C Operating Humidity 95 RH non condensing at 25 C CTCSS Decode Programmable to any of 42 CTCSS tones DCS Decode Programmable to any of 83 DCS sequences Normal or inve...

Page 45: ...ous Output Power 95 dBm Hum and Noise Ratio 34 dB Narrow Band Analog 40 dB Wide Band Analog Audio Output 600 Ω balanced line output configurable for unbalanced line De emphasis or Flat output 3 dBm maximum level Audio Distortion Analog 2 0 25 C 3 0 30 C to 60 C Digital as per TIA EIA 102 CAAB Front Panel Controls Receiver Power On Norm Off Squelch Disable Push button Analog and Digital Receive LED...

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Page 47: ...r 95 dBm Hum and Noise Ratio 34 dB Narrow Band Analog 40 dB Wide Band Analog Audio Output 600 Ω balanced line output configurable for unbalanced line De emphasis or Flat output 3 dBm maximum level Audio Distortion Analog 2 0 25 C 3 0 30 C to 60 C Digital as per TIA EIA 102 CAAB Front Panel Controls Receiver Power On Norm Off Squelch Disable Push button Analog and Digital Receive LED indicators COR...

Page 48: ...MT 4E VHF UHF Receiver Transmitter Instruction Manual IM08 MT 4E TXRX P1162 42 This Page Intentionally Left Blank ...

Page 49: ...s Adjacent Channel Power Ratio 70 dBc Analog 70 dBc Digital Undesired Emissions Conducted Spurious 70 dBc 8 0 W RF Output Intermodulation Attenuation 45 dB Analog 45 dB Digital VSWR Protection 20 1 VSWR at all phase angles Operating Temperature Range 30 C to 60 C Operating Humidity 95 RH non condensing at 25 C Operating Voltage 13 8 VDC Nominal range 10 to 17 VDC 9 5 VDC Regulated Transmit Current...

Page 50: ...cm 7 5 in Module Weight Receiver 1 2 kg 2 5 lbs Transmitter 1 4 kg 3 0 lbs Corrosion Prevention Anodized aluminum construction Stainless steel hardware Gold plated module connectors Module Design Compact Eurostandard modular design Plug in modules mate with the Daniels standard MT 4E repeater subrack Subracks modules comply with IEEE 1101 DIN 41494 and IEC 297 3 mechanical size modular arrangement...

Page 51: ...ating Humidity 95 RH non condensing at 25 C Operating Voltage 13 8 VDC Nominal range 10 to 17 VDC 9 5 VDC Regulated Transmit Current 1 7A 2 0W RF Output 2 8A 6 0W RF Output Stand By Current 50 mA no encryption installed 80 mA with encryption modules installed Front Panel Controls Transmitter Power On Norm Off Key Tx Mic Mode Analog Digital Analog and Digital Transmit LED indicators PTT Time Out Ti...

Page 52: ...are Gold plated module connectors Module Design Compact Eurostandard modular design Plug in modules mate with the Daniels standard MT 4E repeater subrack Subracks modules comply with IEEE 1101 DIN 41494 and IEC 297 3 mechanical size modular arrangement External Connections RF Connection Type N connector located on the module front panel Digital I O interface is made via RJ45 modular jack located o...

Page 53: ...arrow Band and Wide Band Analog 70 dB Digital Spurious Response Rejection Class B 70 dB Narrow Band and Wide Band Analog 70 dB Digital Conducted Spurious Output Power 80 dBm Hum and Noise Ratio 31 dB Narrow Band Analog 37 dB Wide Band Analog Audio Output 600 Ω balanced line output configurable for unbalanced line De emphasis or Flat output 3 dBm maximum level Audio Distortion 3 0 25 C 5 0 30 C to ...

Page 54: ...able to any of 83 DCS sequences Normal or inverted DCS can be selected IC Certification No 142A UR4E768 142A UR4E800 142A UR4E850 FCC ID n a Declaration of Conformity DOC P25 Digital specifications are applicable only for modules with the P25 Digital firmware upgrade 700 800 MHz Receiver Performance Specifications continued ...

Page 55: ... 60 C Operating Humidity 95 RH non condensing at 25 C Operating Voltage 13 8 VDC Nominal range 10 to 17 VDC 9 5 VDC Regulated Transmit Current 1 8A 3 0W RF Output Stand By Current 115 mA no encryption modules installed 145 mA with encryption modules installed Front Panel Controls Transmitter Power On Norm Off Key Tx Mic Mode Analog Digital Analog and Digital Transmit LED indicators PTT Time Out Ti...

Page 56: ...truction Stainless steel hardware Gold plated module connectors Module Design Compact Eurostandard modular design Plug in modules mate with the Daniels standard MT 4E repeater subrack Subracks modules comply with IEEE 1101 DIN 41494 and IEC 297 3 mechanical size modular arrangement External Connections RF Connection Type N connector located on the module front panel Digital I O interface is made v...

Page 57: ... the next adjacent channel May or may not be identical to bandwidth Common Air Interface CAI A radio to radio signal path defined in terms of Access Method Modulation Scheme Vocoding Method Channel Data Rate and Channel Data Format CTCSS Abbreviation for Continuous Tone Controlled Squelch System DCS Digital Coded Squelch DSP Digital Signal Processor a specialized microprocessor DTMF Dual Tone Mult...

Page 58: ...Squelch A radio circuit that eliminates noise from the speaker when no transmitted signal is present Subscriber Unit A mobile or portable radio unit used in a radio system TGID Talk Group Identifier A 16 bit field identifying the talk group of the radio message TIA Telecommunications Industry Association Time Out Timer A function that limits the transmission period to a pre defined time The user w...

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