Codan Radio Communications UT-4E500 MT-4E T-Band (470 to 512MHz) Transmitter User Manual Part 1

Codan Radio Communications MT-4E T-Band (470 to 512MHz) Transmitter Part 1

1. User Manual Part 1
2. User Manual Part 2

User Manual Part 1

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Document ID	782902
Application ID	qkxX3k7Hn/AS2Ih0XBcljg==
Document Description	User Manual Part 1
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	183.89kB (2298616 bits)
Date Submitted	2007-04-19 00:00:00
Date Available	2007-06-03 00:00:00
Creation Date	2017-11-27 14:00:11
Producing Software	GPL Ghostscript 9.18
Document Lastmod	2017-11-27 14:00:11
Document Title	User Manual Part 1
Document Creator	Avision AVCapture

= DANIELS“I
- mun.
Dominant Number:
Rsvisum:
Remain" Bile:
MT-4E VHF & UHF
RECEIVER & TRANSMITTER
INSTRUCTION MANUAL
1mm MHz / 406-470 MHz ”70-520 MHz
Covers Models:
UR~4E420 004700 UT—4E400-00—800
UT-4E450—00-300 '
UR—4E460~0 DO UT-4E500—00-800
UR—4E460-A0—000 VR4E150-00~000
UR—4E500-0 00 VR-4E150-A0—000
UR-4E500—A0—000 VT4E150-00-800
Comm 0 2007 Daniels Elewollitt Hi All rights "carved. N0 pm
01 mi; publication may be roprodumd. stored In I remnl symm
or ”811th in any form or by any means, elecmmic, mechanical.
photocowlm, ramming or omenw'u. wilt-out the priorwlimn consent
0! Daniel: Electronics Ltd.
Thn [Mind “Din“! Elamrllu Ltd.’ and “DE" logo are regimred
Canadlln and US trademarks MDanhIs Elsmniﬁ Ltd.
The M266 Daniels Elec'mnils Lin.‘ and 'DE" 1090 are New“ 01
Daniels Emmi“ LN.
IMUB-MTAE-TXRX Danials Emmi“ LN.
10-2 eri& 50
Mar 2007 PRINTED IN CANADA
DOCUMENT CONTROL Thls document hat been pruduud. veriﬁed and oommlled in
accordance with Daniels Eleamniu' Qualily Management Mm
Mulrerrienu.
Please report any errors or niobium to Dnrilels Elomnics’
Customer Service Depanmmt.
DOCUMENTREVISION Darisls Elemnies Lid, utilizes a mreeJevel revision mum. Thls
DEFINITION symm enables Daniels h ldtnﬁfy me eigmﬁunu 01 I revision,
Each element of the revision numbcr xlqlllilt the loops of change a:
MM in the diagram bnbwi
Major Revisions: The resull of a major
change to mam fundion, primes or
requirements.
Minor Revisions: The mull of a
minor change in product, prom“ or
maulmmems.
Edibr'nl Revisions: The reeult oi typing
oorremlons or alumna in ramming,
grammar ar warding.
Thmrltvd revision numbers sun at 1-0-0 for me ﬁst release. The
appropriate element alme revision number I; immenled by 1 lore-ch
subsequent revision, causing llly Obits in «no do“ In be ream D.
For example:
If the cum revision = 24-1 Then "IQ next rm‘ipr revision l 3-0-0
I’ the cum revision = 4-3-1 Then the nut minor revision = 4-4—0
I' me Durmm mvlslori I 3-2-2 Then me next editorial I‘viﬂon = 34-3
The complain miihn hlswfy is wailiﬂed Mme MK 01 me document
NOTE The user's authpmy to operate this equipment could be revoked
ihrwgh any danger or modiﬁcations not expressly lpprwed by
Daniels Electronics Ltd.
The AMBE+2W vobl coding Technology em“ in mls around
is pm by Intellectual property nails Induﬂim parent rights,
oopynuhb Ind trade secrets 0! Digital Voice Sysiiems, Inc. This
voice coding Tlchnany k Ilwiaed solely bf use within his
cummiiniceﬂwu Equlpmunt. The user ohms Technology IS ﬂuidity
prohibited M ammwna in mm, remove. demoile, errse
engineer. ar dimumhla me Object Code, will any mil-may
convert me Dialed Code Into a human-readable form. us, Patent
Nos. ”5,070,405. “32622215754374, ﬁ,701.390.'5,7i5,355.
“549.050. ”5,530,011,#5,581.555‘ $5,5|7,511, “$91,772.
“247,579, “225,054 and 15,195.1564
The design 01 ml: equipment I: sublecno change due in mniinuous
development 111; equprrierit may inoorporals miior changes in
Mil from m munaucri romaine-1 in (his mannali
D=" MT-4E VHF & UHF Receiver 8- Trznsmimer Irislmmion MInUII
_ lMOA—MT—AE-TXRX
RF Exposure Warning
Exposure to radio frequency (RF) energy has been identiﬁed as a potential environmental (actor that must be
considered before a radio transmitter can be authorized or licensed. The FCC and is have lherelore developed
maximum permissible exposure (MPE) linits lor ﬁeld strength and pwer density, listed in Fee 47 CFR §
1.1310 and IC RSS-102 Issue 2 Sect 4. The FCC has furthermore determined that determination of compliance
with these exposure limits, and preparation ct an Environmental Assessment (EA) if the limits are exceeded.
is necessary only for lacilities, operations and transmitters that tall into certain risk categories. listed in FCC
47 OF R 5 1.1307 (b). Table 1. All other facilities. operation: and transmitters are categorically excluded from
making such studies or preparing an EA, except as indicated in FCC 47 CFR §§ 1.1307 (c) and (d).
Revised FCC OET Bulletin 65 (Edition 97-01) and IC RSS-102 Issue 2 provide assistance in determining
whether a proposed or existing transmitting facility. operation or device complies with RF exposure limits.
In accordance with OET Bulletin 65, FCC 47 CFR 5 1.1307 (b) and RSS-102 Issue Sect 2.5. this Daniels
Electronics Ltd. transmitter is categorically excluded trorn routine evaluation or preparing an EA tor RF
emissions and this exclusion is sufﬁcient basis tor assuming compliance with FCC/IO MPE limits. This exclusion
is subject to the limits speciﬁed in FCC 47 CFR §§ 1.1307 (b), 1.1310 and IC RSS-102 Issue 2 Sea 4. Daniels
Electronics Ltd. has no reason to believe that this excluded transmitter encompasses exceptional characteristics
that could cause non-compliance,
Nodes:
' The FCC and 10's exposure guidelines constitute exposure limits. not emission limits. They are relevant
to locations that are accessible to workers or members or the public. Such access can be restricted or
controlled by appropriate means (is. lences. warning signs. etc).
~ The FCC and lC'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 report: indicating compliance.
RF Safety Guidelines and Information
Base and Repeater radio transmitters are designed to generate and radiate RF energy by means of an external
antenna, typically mounted at a signiﬁcant height above ground to provide adequate signal coverage. The
tollwing antenna installation guidelines are extracted from Appendix A from OET Bulletin 55 and must be
adhered to in order to ensure RF exposure compliance:
Height above ground level to lowest point of antenna 2 10 m g;
Power 5 1000 W ERP (1840 W EIRP)
E . . _ _
Power 51000 W ERP (1540 W EIRP)
The following RF Safely Guidelines should be observed when worklng In onmund transmitter sites:
~ Do network on or around any transmitting antenna while RF power is applied.
- Before working on an antenna. disable the appropriate “hammer and ensure a nD0 NOT USE" or
similar sign is placed on or nearttre PTT or kay~up control.
- Assume all antennas are acﬂve unless speciﬁcally indicated otherwise.
~ Never operate a transmitter with the cover removed.
- Ensure all personnel entering a transmitter site have electromagnetic energy awareness training.
For-more Infonrraﬂon on RF eneryyexposun and compliance, please refer to the following:
1. Fee Code of Regulations; 47 CFR §§ 1.1307 and 1.1310.
2s FCC OET Bulletin 65. Edition 97-01. “Evaluating Compliance with FCC Guidelines for
Human Exposure to Radiotrequency Electromagnetic Fields',
3. http:I/www,lccrgov/detlrlsafe|yl
4. lC RSS-102 issue 2. “Radio Frequency Exposure Compliance of Radio communication Apparatus'
MT-4E VHF 6 UHF Receiver 81 Tmnslllilter instruction Manual | _-"‘
lMBQ-MT-‘E-TXRX D—
iv This P3413 Inlemmnally Leﬂ Blank
n="‘ MTAE VHF l. UHF Receiver & Tmnsmmw lnﬁmﬁhn Manual
— IMOB-MT-lE-TXRX
Contents
General Information,
Introduction .............
Receiver Performance Speciﬁcations.
Transmitter Performance Speciﬁcations .
Physical Speciﬁcations .............
Theory of Operation.
Receiver Theory...
Transmitter Theory
Channel and Bank Selection.
Radio Service Software Programming
Introduction
Receiver Radio Service Software Programming
Transmitter Radio Service Software Programming ..
Radio Service Software Tuning
Introduction .............
Receiver Service Software Tuning
Transmitter Service Software Tuning ..
Hardware Tuning and Troubleshooting
Repair Note .................
Recommended Test Equipment
Receiver Assembly.
Receiver Frequency
Receiver RF Preselector Tuning Procedure
Alternate Tuning Procedure
Transmitter Assembly .....
Transmitter Frequency Change
Transmitter Ampliﬁer Tuning Procedur
Receiver Jumpers
Transmitter Jumpers
Front Panel RJ45 Jack Pinouts.
48 Pin Motherboard Interface Connector
Receiver Troubleshooting ..
Transmitter Troubleshootin
System Troubleshooting
Radio System Conﬁgurations
Repeater ..................
Analogr Fixed (Base) Station Interface.
Digital Fixed (Base) Station Interface.
Contents continued next page
MT-4E VHF Gt UHF Receiver iTrilllmiltlr Instruction Manual | _
immune-max D—
vi
Illustrations
Printed Circur
MT-4E Receiver Front Wow ..................
MT-4E Receiver Exploded View Diagram.
MT-4E Receiver Block Diagram
MT-4E Receiver Top Compone
MT-4E Receiver Top Component View (2)
MT—4E Receiver Bottom Component View
MT-4E Receiver Top Jumper and Test Point Locate
MT-4E Receiver Bottom Jumper and Test Point Locator
MT-4E Transmitter Front Wew ..................
MT-4E Transmitter Exploded Wew Diagram .
MT-4E Transmitter Block Diagram .........
MT-4E Transmitter Top Component Wew .
MT-4E Transmitter Bottom Component Wew
MT-4E Transmitter Ampliﬁer Removed View.
MT-4E Transmitter Top Jumper and Test Point Locator.
MT—4E Transmitter Bottom Jumper and Test Point Locate
Parts Lists .............................
MT-4E Receiver Electrical Parts Lls
MT4E Receiver Mechanical Parts Lis
MT-4E Receiver P25 Digital Fimiware
MT-4E Receiver and Transmitter Encryption
MT-4E Receiver and Transmitter RSS
E»
tan—room
on
(n
ages“
MT-4E Transmitter Electrical Parts Lie 7
MT-4E Transmitter Mechanical Parts List . 7
MT-4E Transmitter P25 Digital Firmware .. .s7
Glossary of Terms ................................................................ es
Revision History ................................................................... 71
D=WJ MT-4E VHF Hi UHF Receiver & Transmitter Inﬂrucﬂon Manual
— IMOS—MT-4E—TXRX
INTRODUCTION
The MT-4E Receiver and Transmitter are FM
radio modules capable of analog operation
in 12.5 kHz (narrow band) or 25 kHz (wide
band) channels. Aﬁrmware upgrade may be
purchased to allow P25 digital operation The
VHF modules operate over the band from 136
to 174 MHz and the UHF modules operate over
the band from 406 to 470 MHz (transmitter)
or 406 to 430 MHz. 450 to 470 MHz and 470
to 520 MHz (receiver) Modular design allows
each of the Receiver and Transmitter“; internal
modules to be individually assembled and
tested. which facilitates construction, tuning. and
general maintenance
The MT-4E Receiver and Transmitter combine
state of the art performance in a compact
modular enclosure tor applications ranging from
remote mountain top repeaters to congested
urban radio environments. Each module is
characterized by dependable. low maintenance
performance under the most severe
envimnmenml conditions
The MT-4E Receiver and Transmitter are
primarily sottware controlled radio modules,
allowing tuning, programming and maintenance
to be done via software service with few
hardware adjustments required
The MT-4E series is compatible with all Daniels'
subrack and base station enclosures. it supports
a basic analog interface, and may be used In
a mixed system with MT-S and MT-4 series
Receivers and Transmitters
GENERAL
INFORMATION
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 the complete
P25 digital voice packet directly to the
transmitter so no P25 digital information is lost,
AII P25 speciﬁcatlons, operational description
and information contained in this Instruction
Manual require the P25 ﬁrmware upgrade to
function if the MT-4E Receiver and Transmitter
are purchased without the P25 ﬁrmware
upgrade, the radio will program and operate in
analog mode only.
MT-4E VHF a UHF Receiver &Tmnlmltarln.|truc1lon Manual | D=w
—
IMOS-MT—4E-TXRX
2 | General Information
Secure Communications
The Receiver and Transmitter are capable of decoding and encoding secure communications it a
DESOFEIAES encryption module is installed. To successfully decode or encode a transmission. the
encryption module must be programmed with a valid encryption key using the Motorola KVL soow
or KVL 3000 Keyloader in conjunction with a Daniels Keyloader Cable. The Daniels Keyloader cable
plugs into the front panel RJ45 jack on the front of the Receiver or Transmitter module, For correct
keylcading. the KVL must be setup to operate using ASN mode. ASN Mode is the default mode of
the KVL 3000 and an optional mode of the KVL 3000+. Consult the instructions for the Keyloader
for details on loading a key. A loaded key may be cleared by pulling ﬁrst the CLEAR KEYS 1 then
the CLEAR KEYS 2 inputs to ground SODms apart Altemately. the CI-BME Base Controller may
be used to clear the 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 Upgrade
software. Atype Ate 5 pin mini-type B USB cable is used to connect the USB port of an lBM
compatible computer to the USB port on the front panel of the Receiver or Transmitter module.
Firmware upgrades can be found on the Daniels Electronics Ltd. website at www.daneleo.com.
MME Receiver Family Models
There are eight models in the MT~4E Receiver family covering the 136 to 174 MHz. 406 to 430 MHz,
450 to 470 MHZ and 470 to 520 MHz bands while operating in 12.5 kHz. 15 kHz. 25 kHz, or 30 kHz
occupied channel bandwidths. The receivers are classiﬁed as Class A or Class E. The eight models
are as follows:
VR-4E150-A0-000 synthesimd. 136-174 MHz band. 12,5!15/25/30 kHz channels: Class A
UR~4E420~AO~DOO synthesised. 406 - 430 MHz band. 1215115125130 kHz channels; Class A
UR-4E460—AO-DOO synthesized. 450 - 470 MHz band. 125115125130 kHz channels; Class A
UR-dEsOO—AO-DOO synthesized. 470 — 520 MHz band. 115115125130 kHz channels; Class A
VR-4E150—00—000 synthesized, 138-174 MHZ band. 125115125130 kHz channels; Class B
UR-4542000-000 synthesized. 403 - 430 MHz band. 125115125130 kHz channels; Class B
UR-4E460—00-000 synthesized. 450 - 470 MHz band. 12,5/1 5125130 kHz channels; Class B
UR-4E500-004300 synthesized, 470 - 520 MHZ band. 125115125130 kHz channels; Class B
D=Wl MT-4E VHF & UHF Recailnr A Transmitter Instmnian Manual
— lMOa-MT-4E-TXRX
Geneal Inbnnalion
RECEIVER PERFORMANCE SPECIFICATIONS
General
Frequency Range: 136t0174 MHz/406 u) 430 MHz/450 (o 470 MHz [470 w 520 MHz
Channel Spacing; 12.5. 15, 2.5 & 30 kHz
Channel Salediorl: In 2.5. 5.0 or 5.25 kHz increments selected with Radio Programming
Schware Package
Number 01 Channels: Preset capability for 2 banks of 16 channels
Channel Switching Range: t 2.0 MHz
Compatibilhy: MT~3 and MT-4 Series Radio Systems; P25 inlaroperable'
System Impedance: 50 9 (Type N connector)
Frequency Generation: Internal Synlrleslzsr
Reference Sensitivity: -11a dam (0.28uV) for 12 dB SINAD
-115 dBm (0,28uV) for 5 % BER”
Local Oscillator Frequency Stability: 2 1,0 ppm (VHF) I t 0.5 ppm (UHF)
Adjacent Channel Rejection (Selectivity): Class A;
< 45 dB; Narrawband Analog
< -75 dB; Wldeband Analog
< —60 65: Digital‘
class B;
< 40 dB; Narrow/band Analog
< -70 dB; Wldsband Arming
< -60 dB: Digilal'
Intermodulaﬁon Rejection: class A:
< -75 dB; Narrowband and Madonna Analog
< -80 65; Digital'
Class B;
< -70 dB; Namband and Vlﬁdeband Analog
< -70 dB; Digital“
Spurious Rszponse Rejection: class A;
< -75 dB; Narrwvband Analog
< -85 dB; VWdeband Analog
< -90 dB: Digital“
Class B;
< -70 dB; Narrowband and Vlﬁdeband Analog
< -70 63; Digital‘
Conducted Spurious Oubul Power: < -95 dBm
Hum and Noise Ratio: < -34 dB: Nurrwband Analog
< 40 dB: Wldeband Analog
Audio output: 600 0 balanced line output (conﬁgurable (or unbalanced llne);
De-emphasil or Flat output. +3 dBrn rnaxlmum level
Audio Dislorlion: Analog; S 2.0 % (25 'C); s 3.0 “A: (40'0 lo +60‘C)
Digital a: per TIA/EIA 102.CAAB‘ ‘
Front Panel Controls: Receiver Power On (Norm) I Oil
Squelch Disable (Push-button)
Analog & Digilnl Receive LED indkmwrs
‘ P25 Digital specifications are applicable onlyformodule: with the P25 Digital ﬁrmware upgrade,
MT—4E VHF «- UHF Reamer & Trausm'mer Instruuion Manual
IMBa—MT-4E—TXRX
DE"
4 General Information
COR Interface: 150 mA, 50 V open drain power MOSFET
Supply Voltage: 443.5 VDC Nominal (range +10 to +17 VDC)
+95 VDC Regulated
Supply Current: class A;
< 250 mA; with no encryption module Installed
< 280 M; with encryption module inualed
Class B:
< 105 mA; with no encryption module installed
< 135 mA: with encryption module installed
Operating Temperature Range: 40‘0 to +60'C
Operating Humidity: 95 % RH (non—condensing) at +25'C
CTCSS Deoode: Programmable to any oMZ CTCSS tones
DCS Decode: Programmable to any oi as Dcs sequences. Normal or inverted
DCS can be mated
IC Certiﬁcation No.: n/a - Declaration of Conformity (DOC)
FCC ID: nla - Dedaratl'on of Conformity (DOC)
' P25 Digital speciﬁcations are applicable anlyformodules with the F25 Digital ﬁrmware upgrade,
MT-4E Transmitter Family Models
There are three models in the MT~4E Transmitter family covering the 136 to 174 MHz, 406 to
470 MHz bands and 470 to 520 MHz. The three models are as follows:
VT—4E1 50-00-8100 136-174 MHz band. 0.58.0 W
UT-4E450—00—800 406-470 MHz band, 0.58.0 W
UT-4E50000-800 470-520 MHz band. 0.5—8.0 W
D=“" MT4E VHF A UHF Receiver & Trummmer Irlltrudion Manual
- IMDE-MT—‘E-TXRX
General Information 5
TRANSMITTER PERFORMANCE SPECIFICATIONS
General
Frequency Range:
136m174MHz/406to470MHz/470t0520MHz
Carrier Frequenw Stability:
Channel Spacing:
$1.0 ppm (VHF) I: 0.5 ppm (UHF)
12.5. 15, 25 a 30 kHz
Channel Selection:
In 2.5. 5.0 or 6.25 kHz Increments selected with Radio Programming
Software Package
Number of Channels: Preset capability tor 2 banks of 16 channels
Compatibility: MT-3 and MT-4 Seriae Radio Systems; P25 interoperable'
RF Output Power: 0.5 to 8.0 W Continuous
Emission Designators:
Analog: 11KOFSE (Narrowbend); 16KOF3E (lMdaband)
Digital Paging: 9K2F1 D
P25 Digital: 8K10F1E (Digital Voice); 8K10F1D (Digital Data)’
System Impedance:
50 0; Type N connector
Duty Cycle: 100 %; Continuous operation
undesired Emissions: < -70 dBc' Analog
(Adjacent Channel Power Ratio) < -70 d lgital‘
Intermodulation Aﬂenuation: < -45 dBAnalog
< 45 dB DIgimI'
undesired Emiealone: < -70 dBc @ B W
(Conducted Spurious)
VSWR Protection: < 20:1 VS'WR at all phase angle:
Operating Temperature Range: 40's to osoc
Operan'ng Humidity: 95 % RH (nmndensim) at ozs'c
Operating Voltage: +138 VDC Nominal (range 010 to M7 VDC)
+9!) VDC Regulated
Transmit Current: (1.7 A at 2 W RF Power Output
<2.BAatBWRF Power Output
Stand By Current:
< 75 mA(no encryption modules installed)
< 105 mA(with encryption modules installed)
Front Panel Controls:
Transmitter power On (Norm) 1 oil 1 Key Tx
Mic Mode: Analog I Digital
Analog a Digital Transmit LED indicators
err Time-Out-ﬂmer:
Programmable from 15 to 465 sec. (in increments of 1 see.) or
inﬁnity (Default 300 see), uting Radio Service Sottware paokage
Audio Input:
Audio Frequency Response:
Audio Deviation Limiting:
Balanced, 800 n or optional unbalanced input
(500 n or 15k n selectable input Impedance)
Pro-emphasis; H. -3 dB (300 to 3000 Hz)
t 2.5 kHz Narrowband. t 5.0 kHz Wioeband
Audio Distortion:
< 3 % THD; 1 kHz tone at 15 kHz or3 kHz deviation
FM Hum and Noise Ratio:
< -34 dB (0.3 to 3.4 kHz De-Emphatls on)
CTCSS Deoode / Encode: Programmable to any of 42 CTCSS tones.
DOS Decode I Encode: Programmable to any of 93 D08 sequences. Normal or inverted
DCS an be selected. Tumult code optional.
IC Certification No 142A—VT4EISO (VHF) I 14M~UT4E450 (UHF)
FCC ID: HMVT-4E150 (VHF) I H4JUT~4E450 (UHF)
' P25 Digital speciﬁcations are amicable only formadules with the P25 Digital ﬁrmware upgrade,
M745 VHF l- UHF Receiver 8- Transmitter Instruction Manual I D_"'
lMos—MT-4E~T>(Rx —-
5 | General Information
DE
PHYSICAL SPECIFICATIONS
Physical Dimensions:
Module Weight
Corrosion Prevention:
Module Design:
External Connections:
lMdth: Height: Depth:
7.1 cm (2.5 in) 12.8 cm (505 in) 19 cm (75 in)
Receiver: 11 lg (2.5 lbs.)
Transmmer. 1.4 kg (3.0 lbs)
Anodized aluminum construction
Stainless steel hamare
Gold plated module connectors
- Compact Eurostendard modular design,
- Plug-in modules male with the Daniels standard MTa repeater submck.
- Suhracks / module: comply with IEEE 1101, DIN 41494 and IEC 297-3
(mechanical size! modular arrangement).
RF Connewon: type N connector located on the module front panel, Digital Ilo
Interface is made via N45 modular jack located on the front panel. Programming
interlaoe it made via mini-type B USB 11 jack located on the tront panel. Motherboard
Connections (Audio. Power. and Control) are made through a 45 pin, gold plated.
type F connector on the rear of the module. User connection made through mated
“motherboard' ammbty of the radio subraok. Type F standard connector complies
with DIN 41612 Level 2 (200 mating cycles. 4 day 10 ppm 302 gas test with no
iunotlonal impairment and no change in contact resistance)
Handle Text Colour:
Red (VHF) I Black (UHF)
"‘ MT-‘E VHF G. UHF Receiver 6- Transmillbr Inslmw'on Manual
IMBB—MT-AE-TXRX
RECEIVER THEORY
The MT-4E Receiver is constructed with the
Receiver Main Board and the RF Preselcctor
sub—assembly The Synthesizer and the
Universal Daughter Board (UDB). that contains
the Digital Signal Processor Board, are mounted
on the Receiver Main Board An optional
Encryption Board may also be installed on the
Receiver Maln Board.
The MT—4E Receiver can receive both an analog
FM modulated carrier and a C4FM P25 digitally
modulated carrier and outputs both a baseband
audio signal to the Motherboard and a Low
Voltage Dill'erential Signalling (LVDS) Serial
Data signal to the front panel RJ451aclc
Power Supply
A nominal 13.8 VDC and a regulated
e9.5 VDC enters the Receiver module from the
Motherboard.
Synthesizer
The synthesizer generates the L0 frequency
which Is output through a small coax cable to
the mixer in the receiver RF Preselector. There
are communication inputs and outputs between
the DSP and synthesizer for control functions,
The synthesizer is wide band and generates
LO frequencies tor mixing across the entire
frequency band
THEORY OF
OPERATION
RF Preselector
The RF Preselector combines a low noise
bipolar ampliﬁer with a cascaded. multiple pole,
high selectivity helical resonator ﬁlter su'ucture.
RF signals at the antenna input are ﬁltered by a
5 pole helical ﬁlter, ampliﬁed through a low noise
ampliﬁer, ﬁltered again by a seven pole low pass
or high pass ﬁlter. and then mixed, with a local
oscillator supplied by the synthesizer. to produce
an lF frequency of 21.4 MHz that is output to
the Receiver Main Board. Interconnections
are made using quick connect SMB style
connectors. A high selectivity narrow bandwidth
of approximately 5 MHz, combined with high
ultimate out-ct-hand signal rejection, greatly
improves Receiver spurious response and wide
band intennodulaticn rejection Tuning of the
helical ﬁlter is provided through ﬁve capacitor
adjustment points. Power for the RF Preselector
is supplied from the receiver‘s regulated
09.5 VDC.
IF Demodulation
The Receiver Main Board processes the
low level 21.4 MHz IF signal from the RF
Preselector through selective crystal ﬁltering
and IF ampliﬁcation. The signal is then passed
through the IQ Demodulator and Digitizing
Stage for demodulation to two quadrature-
related baseband outputs. These outputs are
represented in a digital stream which is passed
to the UDB Board, where DSP techniques are
used to further process the incoming sampled
signal to extract P25 digital voice signals and
analog voice signals.
MT-4E VHF G UHF Receiver iTransmmet Instruction Mlnull | n-"‘
immne-Txax =
DE"
3 i Theory aromas-l
Analog / Digital Detection
The digital detector in the UDB looks for a
speciﬁc P25 bit pattem called the Frame Synch.
It the Frame Synch is detected, P25 digital
processing is applied. and 11 no Frame Synch is
detected, the signal is assumed to be analog,
and analog processing is applied.
Analog FM Reception
When an analog FM signal is received, the MT-
4E Receiver sends the sampled audio from the
demodulator to the Universal Daughter Board
where it Is passed to a Digital Signal Processor
(DSP) for further processing. Deemphasls
is applied using DSP techniques and the
sampled audio is output to both the LVDS Serial
Data on the front panel RJ45 jack and to the
Motherboard through a D/A converter.
P25 Digital C4FM Reception
When a P25 digital C4FM signal Is received, the
DSP performs bit recovery and the bit stream is
sent to both the LVDS Serial Data on the front
panel RJ45 jack and to the Motherboard through
a De-Vocoder and DIA converter.
Analog and P25 Digital Settings
The DSP controls the settings that are applied to
the analog or P25 digital signal, such as CTCSS,
DCS. de-emphasis. wide or narrowband
selection. NAC, and TGID. These settings are all
conﬁgured in the RSS software on a per channel
basis.
Audio Circuitry
Baseband analog audio is output through
four separate outputs to the Motherboard. An
independent level adjustment is performed for
the balanced audio output, the SM-3 speaker
audio output, the discriminator audio output and
discriminator low pass ﬁltered output.
MT-4E VHF In UHF Receiver & Transmitter Instruction Manual
IMUB-MT-4E-TXRX
COR Circuitry
The MT~4E Receiver Is able to distinguish
between incoming analog signals and digital
signals, and pulls the front panel ANALOG COR
output low for an analog FM carrier. or it pulls
the front panel DIGITAL COR output low for a
P25 digital C4FM carrier.
The front panel DIGITAL COR and ANALOG
COR outputs are typically sent to the Transmitter
or Universal Interface Card.
The Receiver will also pull the COR output on
the Motherboard lowwhen either an analog FM
or P25 digital C4FM carrier is detected.
When the receiver receives an analog or digital
signal, the DSP will activate the front panel
analog or digital LED.
MUTE Circuitry
A MUTE line from the Motherboard will override
all COR outputs, balanced audio output. SM-3
speaker audio output and the LVDS Serial Data
output and keep them from activating.
The Mute line is used to externally control
squelching features of the receiver.
TRANSMITTER THEORY
The MT-4E Transmider is constructed with
the Transmitter Main Board and the Ampliﬁer
module sub-assembly. The Synthesizer and the
Universal Daughter Board (UDB), that contains
me Digital Signal Processor Board, are mourned
on the Transmitter Main Board. An optional
Encryption Board may also be installed on the
Transmitter Main Board.
The MT4E Transmitter can accept both a
baseband audio signal from the Motherboard
or microphone, or a Low Voltage Differential
Signalling (LVDS) Serial Data signal from
the front panel RJ451aok for processing and
transmission as an FM modulated carrier or a
C4FM P25 digitally modulated carrier.
Power Supply
A nominal ”3,8 VDC and a regulated +95 VDC
enters the Transmitter module from the
Motherboard.
Analog FM Transmission
When analog FM Transmision is required. the
MT~4E Transmitter accepts a baseband audio
signal from the microphone or balanced audio
input. A level adjustment is performed and
an analog to digital (AID) converter samples
the audio. The digin’zed signal is applied to
the Universal Daughter Board and passed to
a Digital Signal Processor (DSP) for further
processing.
The MT~4E Transmitter can also accept an
LVDS serial daha signal from the front panel
RJ45 jack that is passed to the DSP for further
processing.
Pre-emphasis and limiting functions are applied
using DSP techniques, and the resulting signal
is converted back to a baseband audio signal
and applied to the VCO and TCXO on the
Synthesizer, producing an analog modulated
carrier.
Theory of Operation
P25 Digital C4FM Transmission
When P25 Digital transmit mode is required.
the MT~4E Transmitter sends the AID sampled
microphone or balanced audio through a
vocoder process in the DSP, which compresses
the voice signal, and adds error protection
information and other P25 Digital signalling
Information to produce a 9600 bps data stream.
Alternatively, the 9600 hp: data stream can be
obtained from the front panel RJ45 jack in the
form of LVDS Serial Data.
Each pair of digital bits is used to generate one
of tour analog waveforms which is applied to
the VCO and TCXO on the Synthesizer, thus
producing a CAFM P25 digitally modulated
carrier:
MTJE VHF A UHF Rmiver A Transmnter Inﬂmction Manual
|M00~MT~4E—TXRX
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10 Theory of Operation
P'I'I' Circuitry
For normal repeater operation. the transmitter
may be keyed up in P25 Digital mode (if it is
programmed for P25 Digital mode or mixed
mode operation) by pulling the front panel
DIGITAL PTT input low.
Similarly, it may be keyed up in analog mode
(if it is programmed for analog mode or mixed
mode operation) by pulling the front panel
ANALOG F'TT input low.
The front panel DIGITAL PTT and ANALOG PTT
Inputs are typically controlled by the Receiver or
Universal Interface Card.
Additionally, the transmitter may be keyed
by activating the microphone PTT switch; by
moving the front panel power switch to the ‘KEY
TX’ position; by grounding one of the P‘l'r inputs
on the Motherboard; or by activating the relay.
For each of these additional cases, if the
transmitter is programmed for P25 Digital
mode or for analog mode, it will be keyed in
the appropriate model If it is programmed for
mixed mode operation. it will use the front panel
Analog/Digital switch to select the mode of
operation,
When the transmitter Is keyed in analog or
digital mode. the DSP will activate the front
panel analog or digital LED and will also activate
a PTT OUT signal line that can be used to signal
externally when the transmitter is keyed (eg. an
Antenna Relay).
Analog and P25 Digital Settings
The DSP controls the settings that are applied to
the analog or P25 digital signal, such as CTCSS,
DOS, pro—emphasis, wide or narrowtiand
selection. NAC. and TGID. These settings are all
conﬁgured in the RSS software on a per channel
basis. .
D=“" MTAE VHF a- UHF Receiver L Transmitter Instruction Manual
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Synthesizer
The synthesizer generates the RF frequency
and modulates the analog or P25 digital signal.
Modulation signals are input to the synmesizer
from the DSP on the UDB via a DIA corwerter.
There are communication inputs and outputs
between the DSP and synthesizer for control
functions. The modulated signal is oumut
through a small coax cable to the transmitter
ampliﬁer. The synthesizer is capable of
modulating signals from 0 to 3.4 kHz.
The synthesizer is wide band and generates RF
frequencies across the entire frequency band.
RF PowerAmpIiﬁer
The Transmitter RF Power Ampliﬁer provides
the ﬁnal stage of RF ampliﬁcation and ﬁltering
for the Transmitterl The ampliﬁer has inputs for
the RF signal from the Synthesizer, and for DC
power. it has outputs for the ampliﬁed RF signal
and for forward and reverse power alemts.
The ampliﬁer is continuously adjustable from 0,5
to 8.0 W output power. The DSP will activate a
power control I enable line that allows the RF
power output of the ampliﬁer to be controlled by
a preselected level In the RSS software
This Ampliﬁer is mounted in a machined
aluminum case that ensures mechanical integrity
for the transmitter, provides a good ground, and
also acts as a heatsink.
AmpliﬁerAlamls and Overload Protection
The ampliﬁer is equipped with toward output
power and VSWR alarm circuitry. The forward
output power alarm will activate when the
forward power output drops below half of
the output power setpoint. The VSWR alarm
will activate at a 3:1 VSWR. The alarms are
available on the Motherboard.
The VSWR overload circuit protects the
Transmitter Ampliﬁer from excessive antenna
vswa by reducing the ampliﬁer’s gain (output
power) when an overload condition occurs. The
VSWR overload circuit is an extension of the
VSWR alarm.
Theoryefoperatmn 11
CHANNEL AND BANK SELECTION
Four channel select lines CSELo-3 are named on the Motherboard, and are brought into the receiver
and transmitter modules by the 43 pin rear connector. allowing selectilm of 16 di'fereni channels,
These signals are normally pulled law In the receiver and transmitter, but are typically set by jumpers
on the Motherboard to select channel 1 by delault. In addition. a bank select Input is provided to
switch between BankA and B, each ofwhich has 15 channels. The Bank select line normally ﬂoats
high (+5 V), selecting Bank A, but may be pulled low or high externally
Channel and Bank Select Line Mapping
The table below shows the relationship between the states of the bank and channel select Ilnesl
Note that the channel select lines follow a binary pattern, but that the binary ‘0” represents channel 1.
The Bank NB select line normally floats high (+5 V), selecting Bank A. but may be pulled low or high
extemally via the BankA/B selea line.
Bank Channel
BANKNB CSEL3 CSELZ CSEL1 CSELO SeIected Selected
HI L0 LO LO LO A 1
HI LO L0 L0 ‘ HI A 2
HI LO LO HI LO A 3
HI LO LO HI HI A 4
HI LO Hl L0 L0 A 5
HI L0 HI LO HI A 6
HI LO HI HI L0 A 7
HI LO HI HI HI A 8
HI HI LO LO LO A 9
HI HI LO LO HI A 10
HI HI LO HI LO A 11
HI HI LO HI HI A 12
HI HI HI L0 L0 A 13
HI HI HI LO HI A 14
HI HI HI HI LO A 15
HI HI HI HI HI A 16
L0 L0 L0 LO LO 5 1
LO LO LO LO HI B 2
L0 L0 L0 HI LO B 3
LO L0 L0 HI HI B 4
LO LO HI LO LO 5 5
LO LO HI LO HI 5 5
L0 L0 HI HI LO 8 7
L0 L0 HI HI HI B 8
L0 HI L0 LO LO B 9
L0 HI LO LO HI B 10
Lo HI L0 HI LO 5 11
LO HI LO HI HI B 12
LO HI HI L0 L0 B 1 3
L0 HI HI LO HI 5 14
LC HI HI HI LO B 1 5
L0 HI HI HI HI B 16
MT-4E VHF & UHF MW aTransmilter Instmdlon Manual | D-"‘
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D="‘ MT-4E VHF A UHF Receiver 6- Transmit” Innmeﬁon Manual
- IMOMAE-TXRX
INTRODUCTION
Receiver and Transmitter programming is
performed with the Pc~based Radio Service
Software (RSS). Atype Ato 5 pin mini-type B
USB 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
at the Receiver or Transmitter module. The
Rss allows the Receiver or Transmitterto be
programmed for operating trequenciee, CTCS$
and DOS signaling, P25 Digital settings such as
NAC and TGID. modulation type and many other
parameters.
System Recommendations
- Microsoft IMndows XP
Recommended Minimum Speciﬁcation
' Pentium III Processor - 500 MHz
- 256 MB Memory (RAM)
- 1 GB Free Disk Space
Installation
The RSS should install automatically once the
CD Is Inserted. If not, run SETUREXE, located
on the CD.
Note: The Receiver and Transmitter must
be programmed separately.
Once the oonnacﬁons are made. the Radio
Sen/Ice Software may be run on the computer
and the radio switched on. The ﬁrst time a
Receiver or Transminer is connected, the USB
drivers will need to be installed from the CD
using the Hardware Update Wizard. To test the
13
RADIO SERVICE SOFTWARE
PROGRAMMING
connection, open the Receiver orTransmitter
Conﬁguration screen by choking on the button
in the Main screen. Click on the Receiver or
Transmitter menu, then on the ID button. Click
on the ‘Read' button. The serial number, model
number, ﬁrmware version and last programmed
date should appear in the appropriate ﬁelds.
Programming settings are divided Into two
categories. Global options and Channel
options. men the Receiver or Transmitter
menu is selected from the main screen. both
the Gobal and Channel options for the current
channel are displayed. The RSS may be used
to save a Receiver or Transmitter conﬁguration
to disk, This function allows the userto save
a ‘standard' conﬁguration, and use it as a
starting conﬁguration for all modules. An archive
01 conﬁgurations from each radio system In
operation may also be kept so that replacement
radios can be programmed easily.
If the MT-4E Receiver or Transmitter is
purchased without the P25 Digital ﬁrmware
upgrade, the P25 Digital options will not be
available in the RSS sottware.
Aservioe mode allows tuning, testing and setup
of the Receiver and Transmitter modules. Analog
and P25 Digital test modes may be selected
by the Radio Service Software, such as Blt
Error Rate testing andTest Pattern generation.
Adjustments may also be performed in the
Service mode, such as audio levels, RF power
output and reference oscillator adjustments. The
Service mode is covered in the Radio Service
Soltware Tuning Chapter.
MT-4E VHF Gt UHF Receiver & Transmitter Instrunlon Manuel 1 D_"‘
MDBMT-eE-TXRX ——
14 | Radio Serwce Software Programming
RECEIVER RADIO SERVICE
SOFTWARE PROGRAMMING
Receiver Global Options
Several options may be set which affect the
operation of the Receiver on a global basis.
Frequency Band
There are four Frequency Bands available for
Receivers.
VHF 133-174 MHZ
UHF 406-430 MHz
UHF 450-470 MHz
UHF 470-520 MHz
When the Frequency Band is changed. the
Frequency ﬁeld In every Receiver channel
will be changed to the lowest frequency in the
band. The Radio Service Software will allow
you to change the Receiver conﬁguration data
Irom one Frequency Band to another, but you
will need the correct Receiver Model to do so.
Note: Daniels Receivers are built
differently depending upon the band.
Therefore, you cannot change a
receiver to a diﬁerent band without a
hardware change,
Base Station: Secure Hardware
This ﬁeld will read if a Receiver currently has a
decryption module installed
D="'| MTJE VHF 8- UHF Reaivor G. Tmnsniftef Instniction Manual
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Base Station: Monitor Type
This is selectable between OPEN and SILENT
squelch types, and affects the operation of the
Squelch Oventde push-button switch on the
front panel ofthe Receiver OPEN squelch
means that the Receiver will unsquelch upon
pushing the button, even if there is no carrier
present. SILENT squelch override means that
the Receiverwill only unsquelch if there is a
carrier present when the switch Is pushedr
Holding the Squelch Disable button on the front
panel for longer than 2 seconds will cause the
Receiverto stay pennanentfy unsquelched.
Normal operation may be restored by pressing
the Squelch Disable button again.
Squelch Settings: Threshold
This setting allows the squelch threshold to be
adjusted. The value does not correspond to
any speciﬁc value of squelch threshold, but is
a relative indication of the RF level needed to
squelch or unsquelch the radio. Increasing the
value means a stronger signal will be required to
unsquelch the radio
Squelch Settings: Hysteresis
This setting allows the squelch hysteresis to be
adjusted. The value does not correspond to any
speciﬁc value of squelch hysteresis, but is a
relative Indication of the hysteresis between the
squelch and unsquelch points. Increasing the
value increases the hysteresis window between
squelch and unsqualch.
Channel Options
The Receiver may be programmed with up to
32 channels, each with a different frequency.
channel spacing and modulation type. The
channels are arranged in two banks of 16
channels each. referred to as BankA and Bank
B. In this manual, a speciﬁc channel is referred
to by its bank and channel i.e. B12 would refer
to channel 12 in bank B. The following are all
the settings that may be programmed on a per-
channel basis
Channel Name
Each channel may be assigned a text name
of up to 16 characters. The name is stored in
the radio, but is never broadcast. It is provided
as a means of identifying the channel during
conﬁguration. The channel name will default to
the bank and channel number ie “A01“ for bank
A, channel 01.
Channel Type
Allowed values here are P25 Digital, Analog,
and Mixed Mode. P25 Digital signaling is a
purely digital mode compatible with other P25
radios. Analog mode is for receiving analog FM
modulated signals. Mlxed Mode allows either
type of transmission to be received.
Frequency
The Receiver‘s channel frequency, in MHz,
may be set here. Only frequencies within the
operational band ofthe Receiver are allowed to
be entered.
Rldlc Service Software Programming 1 5
P25 Digital Settings: Unmute on
Allowed settings are:
- Unmute on any P25 signal, 111is setting allows
the receiver to unsquetch on any P25 digital
signal. regardless of the NAG or TGlD value.
‘ Unmute on NAC.This setting requires thatthe
received NAG matches the programmed value
before the receiver will unequelch.
' Unmute on MAC and TGID. This setting requira
that both the received NAC and TGID match
the programme values before the receiver will
unequelch,
P25 Digital Settings: Network Access Code
The receiver’s Network Access Code can be
set here. The receiver may be set to unsquelch
on a speciﬁc Network Access Code, or on any
Network Access Code.
The Network Access Code (NAG) Is a 12 bit ﬁeld
embedded within every P25 voice call.
NACs are primarily used for two purposes:
1. They allow a large system coverage area to be
serviced by separete repeaters.
2. They allow multiple repeaters to service multiple
systems with overlapping coverage areas. NACs
achieve these function: by minimizing co-mannel
interference. This is done by keeping the receiver
squelched unless a signal with a matching NAC
arrives.
The NAC’s 12 bit ﬁeld ranges from U to 4095
(hexadecimal $0 to SFFF). The default value
is $293 and two values are deﬁned for special
functions.
1. When a receiver is set for MAC $F7E. it
unsquelches on any incoming NAG. but
changes the NAC to the one programmed in the
transmitter.
2. if e repeater receiver is set for NAC $F7F. it also
unsquelches on any incoming NAG. The P25
repeater will repeat any NAC that it receives.
MT-4E VHF & UHF Rooemr d- Transmitter Inmate" Manual | D_"'
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Radio Sorvira software Programming
P25 Digital Settings: Talk Group ID
The receiver's Talk Group 10 can be set here.
This applies to P25 signals only. The receiver
may be set to unsquelch on a speciﬁc Network
Access Code. or on any Network Amess Code.
The Talk Group Identiﬁer (TGID) is a 16
bit ﬁeld embedded within every P25 voice
call. The purpose of a Talkgroup is to allow
logical groupings of radio users into distinct
organizations.
The TGID's 16 bit ﬁeld ranges from 0 to
65.535 (hexadecimal so to $FFFF). Three of
these values are set up for special functions.
1. The default value of 51 should be used in
systems where no other talk groups are deﬁned.
2. A value of $0 corresponds to “no—one“ or a talk
group with no users
3. Avalue ot SFFFF is reserved as a talk group
whlch includes everyone.
Analog Settings: Squelch Type
This setting may be set to Carrier Squelch,
CTCSS or DCS. When the receiver is set to
Carrier Squelch, it will unsquelch when it sees
a carrier whose level exceeds the Squelch
Threshold for the channel, CTCSS Squeloh
Type requires that a particular Continuous
Tone Coded Squelch System tone be present
to unsquelcht DCS Squelch Type requires
that a particular Digital Coded Squelch code
be received continuously to unsquelch the
Receiver. When either CTCSS or DCS Squelch
Type is selected. additional combo boxes appear
to allow selection of a particular tone or code.
MT-4E VHF & UHF Receiver & Transmit“ Instmcﬁon Manual
IMUMTdE-TXRX
Analog Settings: CTCSS Tone
This ﬁeld allows selection of any of 42 EIA
CTCSS tones.
Analog Settings: DCS Code
This ﬁeld allows selection of any of 83 DCS
tones.
Analog Settings: Invert DCS
This setting is In etiect Mien me Squelch Type
is set to DCS. It may be setto Normal DCS or
Invert DCS. When invert DCS is selected. the
receiverwill respond to a DCS code that has
been inverted by an odd number of ampliﬁcation
stages. This should not be required unless the
DCS signal has been inverted in the source
transmitter.
Analog Settings: Bandwidth
This setting should be changed to match the
channel spacing and bandwidth of the analog
channel. This setting applies ONLY to the analog
channel, and it is possible in Mlxsd Mode to
have a 25 kHz analog channel and a P25 digital
channel. which is aways a 12.5 kHz channel.
Analog Settings: Audio De—emphasis
For conventional analog channels, the standard
6 dB/octave de-emphasis curve may be disabled
or applied to the demodulated audio. This affects
the analog signal at the Audio Output of the
Receiver as well as the digital representation of
the analog signal which is passed out the LVDS
Serial Data on the front panel.
TRANSMITTER RADIO
SERVICE SOFTWARE
PROGRAMMING
Transmitter Global Settings
Several options may be set which affect the
operation of the Transmitter on a global basis.
Frequency Band
There are three Frequency Bands available for
Transmitters:
VHF 136-174MHZ
UHF 406 - 470 MHz
UHF 470 - 520 MHz
When the Frequency Band is changed, the
Frequency ﬁeld in every Transmitter channel will
be changed to the lowest frequency in the band.
The Radio Service Software will allow you to
change the Transmitter oonﬁgurah’on data from
one Frequency Band to another, but you will
need the correct Transmitter Model to do so.
Note: Daniels Transmitters are buitt
differently depending upon the
band. Therefore, you cannot change
a transmitter to a different band
without a hardware change.
Unit ID
This ﬁeld contains the unique Transmitter unit
ID. The default value is $1. The spin button to
the right of this ﬁeld allows you to incrementally
change the ID,Thie unit ID will be transmitted
in the source In ﬁeld along with every P25
voice frame it the transmitter is keyed in a non-
repeater mode. Each Transmiﬂer should have a
unique unit ID,
Radh Service Software Programmkrg 17
Secure Hardware
This ﬁeld will read if a Transmitter currentty has
an encryption module installed.
Hang Trme: Duration
Hang time is a selectable time delay, which can
be enabled to keep the transmitter keyed aﬂer
its front panel PTTs are released. It can be used
to prevent a chain of repeaters from dropping
out ifthe user de-keys brieﬂy.
It is also commonly used. in conjunction with the
Courtesy Tone, at the end of the transmission
to keep the transmitter keyed long enough to
provide conﬁrmation that the repeater has been
aaivated by mobile radios.
Hang Trme: Courtesy Tone
This Courtesy Tone can be set to Silent, Beep
Tone cr Burst Noise. When the transmitter is set
to Burst Noise. a burst or noise is transmitted for
the duration of the hang time. Beep Tone sends
out a short continuous tone ford-re duration of
the hang time.
Timeout Options
The transmitter provides a selectable timeout
timer for each channel, which causes the
transmitter to be de-keyed after the selected
interval of continuous transmission has been
completed. Two transmitter timeout values are
provided, and one of the timeout values may he
used in each of the 32 programmable channels.
The range of values is from 15 to 465 seconds
in increments of 15 seconds, or Infinite Trme
may be chosen.
These selected Timeouts can then be used
in the “timeout Value ﬁeld in each Transmitter
Channel Setting. These ﬁelds are used to
program the parameters for a single Transmitter
channel only. There are 32 different available
channels labeled A1 -A16 and B1 - B16. The
parameters for each channel are independent of
parameters In other channels.
MT-4E VHF d. UHF Receiver 8- Transmitter Insttudion Manual I D_"'
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13 | Radio Service Sottware Programming
Channel Settings
The transmitter may be programmed with up to
32 channels. each with a different traquency,
channel spacing and modulation type. The
channels are arranged in two banks or 16
channels each. referred to as BankAand Bank
5. In this manual, a speciﬁc channel is referred
to by its bank and channel is B12 would refer
to channel 12 in bank B. The following are all
the settings that may be programmed on a per-
channel basis
Channel Name
Each channel may be assigned a text name
of up to 16 characters The name is stored in
the radio. but is never broadcast. It Is provided
as a means of identifying the channel during
conﬁguration The channel name will default to
the bank and channel number I.e. ”A01" for bank
A, channel 01.
Channel Type
Each MT-4E Transmitter can be programmed
in analog only, P25 digital only, or mixed mode.
P25 Digital signaling is a purely digital mode,
compatible with other P25 radios. Analog mode
is for transmitting analog FM modulated signals.
Mixed Mode is both P25 Digital and Analog
signals
Frequency
The transmitter‘s frequency may be set here,
The Radio Sewioe sokware will only allwv
frequencies wimin the operation band (set in the
Transmitter Global options above) to be entered.
Timeout Value
This option allows selection of one oftwo preset
timeout timer values Each of the two preset
values Is set in the Transmitter Vlﬁde Settings
panel. in the section called Timeout Options. If
the transmitter is keyed continuously for longer
than the selected time, it will be tie-keyed, To
reset the timeout timer, the applied PTT signal
must be removed for a period at least as long as
the hang time.
“' MT-4E VHF A UHF Receiver It Transmitter human Manna]
IMOS—MT—4E-TXRX
P25 Digital Settings: Network Access Code
For P25 channels, the transmitted Network
Access Code can be set here, The Network
Access Code (NAC) is a 12 bit ﬁeld embedded
within every P25 voice caIL
NACs are primarily used for two purposes:
1. They allow a large system coverage area to be
serviced by separate repeaters.
2. They allow multiple repeaters to service multiple
system: with overlapping coverage areas, NACs
achieve these tunctions by minimixing co—channel
interference. This is done by keeping the receiver
squelched unless a signal with a matching NAC
arrive;
The NAC's 12 bit ﬁeld ranges from 0 to 4095
(hexadecimal $0 to SFFFL The default value
is $293 and two values are deﬁned tor special
functions in the receiver.
14 When a receiver is set for NAG $F7E. it
unsquelchen on any incoming NAC. but
changes the NAG tothe one programmed in the
transmitter.
2. it a repeater receiver is set tor NAC $F7F, it also
unsquelches on any incoming NAci The P25
repeater will repeat any NAG that it receives.
P25 Digital Settings: Talk Group ID
The transmitters Talk Group ID can be set here.
This applies to P25 signals only.
The Talk Group Identiﬁer (TGID) is a 16 bit
ﬁeld embedded within every P25 voice
call. The purpose of a Talkgroup is to allow
logical groupings of radio users into distinct
organizations. The TGID's 16 bit field ranges
from 0 to 65.535 (hexadecimal $0 to SFFFF).
Three of these values are set up for special
functions.
1. The default value of $1 should be used in
systems where no other talkgroups are deﬁned.
2. A value of $0 corresponds to “no-one" or a talk
group with no users.
3. Avalue of SFFFF is reserved as a talk group
which Includes everyone.
Analog Settings: Signaling
This setting may be set to No Tone, CTCSS or
DOS, When either CTCSS or DCS Squelch Type
is selected, additional boxes appear to allow
selection of a particular tone or code.
Analog Settings: CTCSS Tone
This ﬁeld allows selection of any of 42 EIA
CTCSS tones.
Analog Settings: Reverse Burst
For CTCSS channels only: When this ﬁeld is set
to ‘Enabled”, each transmission is terminated
with a short burst of CTCSS tone with its
phase reversed. This allows suitably equipped
receivers to squelch their audio circuits before
the transmitted carrier is dropped, giving a silent
squelch operation.
Radio Service were Programming 1 9
Analog Settings: Burst Phase
Various mobile manufactures use either one of
the following TIA recommended Reverse burst
formats.
120° deg
Reverse Burst Phase is shifted forward 120°
for 180 milliseconds priorto turning off the RF
carrier.
1300 deg
Reverse Burst Phase is shifted forward 180°
for150 milliseconds prior to turning off the RF
carrier
Analog Settings: DCS Code
This ﬁeld allows selection of any of 83 DCS
tones,
Analog Settings: Tumoff Code
For Dcs channels only: When this ﬁeld is set to
‘Enabled”. each transmission is terminated with
a short burst of 138 Hz tone. This allows suitably
equipped receivers to squelch their audio circuits
before the transmitted carrier is dropped, giving
a silent squelch operation
Analog Settings: Invert DCS
This setting Is In effect when the Squelch Type
is set to DCSA It may be set to Normal DCS
or Invert 005. When invert DCS is selected,
the transmitter will broadcast a DCS signal
whose polarity is reversed. This should not be
required unless the distant receiver has its DCS
conﬁgured with the wrong polarity. typically
when DCS has been installed as an after-market
option.
Analog Settings: Extemat Input
This setting allows the external input to supply
the CTCSS tone or DCS code for transmission
on the RF carrier.
MT—4E VHF a. UHF Receiver St Transmitter Instruction Manual | D-“‘
IMDS-MT-AE-TXRX =
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Radkt Service SolMare Programming
Analog Settings: Bandwidth
This setting should be changed to match the
channel spacing and bandwidth at the analog
channel. This setting is visible only when the
Channel Type ﬁeld is set to Analog or Mixed
Mode,
Analog Settings: Pris-emphasis
For analog channels, the standard 6 (QB/octave
pre-emphasis curve may be either disabled or
applied to the transmitted audioi Pre-emphasis
is applied to audin from the balanced audio
input, the microphone input, and the digital
representation of the analog signal which is
received from the LVDs Serial Data on the tront
panel.
MT—4E VHF & UHF Receiver 8. Transmitter Inxtmetion Manual
IMuG-MT-4E-TXRX
INTRODUCTION
The RSS has the ability to put the receiver
or transmitter into Service mode, where
adjustments to the Audio Levels, RF Power
Levels. Reference Oscillator and System
Setup may be carried out. Bit Error Rate (BER)
testing and transmittertest patter; may also be
performed in Service mode.
To put the receiver or transmitter in Service
mode. the module must be connected to a PC
running the Radio Service Software (RSS)
through a type Ato 5 pin mini-type B USB
cable. From the RSS Conﬁguration window.
click on the Service button. The Service window
appears. followed by a message box saying
“Service mode entered“. Click on the OK button
to dismiss the message box.
When any required service functions have been
completed, the receiver or transmitter can be
taken out of Service mode by clicking on the
Exit button in the Service Receiver window
There will be a delay of several seconds, then
the message box will be displayed saying “Out
of Service mode". The receiver or transmitter
will also exit Service mode If power Is removed.
In this case. the RSS will display warning
messages when any service functions are
attempted. If this should occur. dismiss the error
messages by clicking on the OK buttons in each
message box until the Conﬁguration window
appears again. Vlmh the radio powered up. the
Service mode may be entered again by clicking
on the Service button.
21
RADIO SERVICE SOFTWARE
TUNING
RECEIVER SERVICE
SOFTWARE TUNING
Reference OscillatorAdjustment
To adjust the reference cscillatorfrequency.
disconnect the RF Preselector from the Receiver
Main Board by separating the SMB connectors.
The Receiver Main Board will GENERATE a
0 dBm RF signal from its IF INPUT. conned
the IF input ofthe Receiver Main Board to a
frequency counter or communications test
set Put the receiver into test mode. Click on
the Reference Oscillator button in the RSS‘s
Service Receiver window. and the Receiver
Reference Oscillator window will appear. Note
the frequency stated In the Target Synthesizer
RF OUT text. and adjust the communications
test set to monitor this frequency. Click on me
Enable button, and the communications test
set will show the presence of a carrier near the
stated frequency. Note the frequency error and
change the Softpot Value until the measured
frequency is as close as possible to the stated
frequency. Click on the Program button to save
the new reference oscillator Scftpot value to the
radio. or on the Cancel button to return to the
original setting. The Service Receiver window
will appear again at this point. This completes
the adjustment of the reference oscillator The
receiver may be left in Service mode.
MTJE VHF & UHF Receiver & Transmitter Instrtlaion Mllull | D_"
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| Radio Sen/ice SoMsre Tuning
Sensitivity Veriﬁcation
Two methods of sensitivity veriﬁcation are
used. one for analog channels and one for P25
digital channels. For either method. the radio
should have a channel prograrrvned for the
desired frequency of operation, and the correct
channel and bank selected. Reconnect the RF
Preselector to the Reoeiver Main Board
Analog Channel
The Reoeiver’s RF input is connected to a signal
generator or communications monitor. Connect
a 600 0 load across the balanced audio output
otthe receiver. Apply power to the receiver.
Set the RF signal generator level to —70 dBm,
modulated by a 1 kHz tone at 3 kHz deviation
tor a 25 kHz channel and at 1.5 kHz deviation
tor a 12.5 kHz channel. Monitor the RMS voltage
across the 600 (1 load using a communications
monitor or SINAD meter. Reduce the RF level
ofthe signal generator while monitoring the
SINAD. When a 12 dB SINAD ratio is reached.
the RF level should be less than —118 dBm. It
may be necessary to press me Squeloh Disable
Button on the Receiver’s front panel to prevent
the Receiver from equelching at these low RF
signal levels.
MT-4E VHF & UHF Receiver at Transmitter mama" Mun]
IMbe-MT-AE-TXRX
P25 Digital Channel
The Receivers RF input should be connected to
a signal generator or communications monitor
capable of P25 digital operation. It the radio is
not already in Service mode from the previous
step. put the receiver into Service mode. From
the R53 Service Receiver window. click on the
BER Test button. whereupon the Bit Error Rate
window will appear. Set the signal generator to
the receiver‘s frequency at —70 dBm, modulated
with the P25 Standard 1011 Hz Pattern or Bit
Error Rate test pattemt Change the frequency
displayed in the Frequency text box to match the
receiver's channel frequency.
For continuous error measurement, make sure
the Test Type box is set to Continuous, and click
on the start Test button. The AvemgeFrames
text box should be set to three names, which
gives an update rate of about a second. The text
boxes labeled Number of Bit Errors and Bit Error
Rate will be updated each second. Reduce the
RF level of the signal generator while monitoring
the Bit Error Rate displayed in the Bit Error Rate
screen. When a 5 % Bit Error Rate is reached,
the RF level should be less than —118 dBm.
Note that the reading will not be exactly 5 %. but
will vary slightty from second to second, similar
to the SINAD reading on an analog receiver.
If long term error testing is required, the Test
Type box may be set to Single, and the Number
of Frames increased to give a long Integration
Time. When the Start Button is pressed, a single
test is begun, with errors accumulating until the
test is complete. A progress bar indicates how
much of the test period has passed.
Audio Level Alignment
The audio level should be set after all other
alignments have been completed. The
Receiver's RF input is connected to a signal
generator or communications monitor and
power applied. Connect a 600 0 load across
the balanced audio output. Two adjustment
procedures are used depending on whether
the channel is analog or P25 digital. For mixed
mode channels, use the analog adjustment
procedure, since there may be small variations
in the audio level when switching between
analog and digital modes. Put the receiver into
Service mode. From the RSS Service Receiver
window, click on the Audio Levels button.
Analog Channel
Set the RF signal generator level to —70 dBm,
modulated by a 1 kHz tone at 3 KHZ deviation for
a 25 kHz channel and at 1.5 kHz deviation tor a
12.5 kHz channel and monitor the RMS voltage
across the 600 9 load using a communications
monitor. Adjust each Soitpot Value to achieve an
audio level of 308 mVRMS (-8 dBm) at each of
the audio outputs. The Discriminator LPF output
does not require adjustment unless it is being
used. Conﬁrm that audio distortion is less than
3 %.
P25 Digital Channel
For P25 only mode appliation, set the RF signal
generator level to —70 dBm, modulated with
the standard Project 25 1011 Hz test pattern at
2.83 kHz deviation and monitor the RMS voltage
across the 600 0 load using a communications
monitor. Adjust each Sottpot Value to achieve an
audio level oi 166 mVRMS(»13.4 dBm) at each
of the audio outputs. The Disoriminator LPF
output does not require adjustment unless it is
being used.
Radio Service Software Tuning
Received Signal Strength Indicator
The RSSI Meterwlll show a value of 0 to 5000
depending on the strenght of the carrier signal
being received at the RF Input. This value is not
calibrated and is only used for relative signal
strength measurements.
System Setup: Jumper Settings
MT-4D Pin Compatibility
This setting should always be left as MT—3 I
MT-4E unless the Receiver Is being used with
an older (2006 or earlier) Base Controller.
When an older Base Controller is used, the
MT—4D selection will setthe Rx Mode pin to be
compatible with the Base Controller.
Subtones on audio path
This setting will allow the analog subtones
(CTCSS or DCS) to pass through the Balanced
and Speaker Audio output for testing or custom
conﬁgurations. When set to Don't Pass, the
subaudible tones are ﬁltered out of these audio
lines (but the subtones are still available on the
Disorimintaor Audio output).
Squelch Relay
This setting will enable or disable a small COR
I 23
relay that can be used for custom conﬁgurations.
This setting should be set to Disable. unless
used.
MT-4E VHF 81 UHF Receiver 8. Transmmer Instruction Manna
IMoo-MT4E»TXRX
IDE"
24 | Radio Service Software Tuning
TRANSMITTER SERVICE
SOFTWARE TUNING
Reference Oscillator Adjustment
The reference oscillator provides an accurate
trequency standard to which the transmitter‘s
carrier signal is phase locked For this test.
the Transmitter will generate an RF signal
from its RF output. Connect the RF output to a
frequency counter or communications test set
To adjust the reference oscillator frequency,
put the transmitter into Service Mode. Click on
the Reference Oscillator button in the RSS‘s
Service Transmitter window, and the Transmitter
Reference Oscillator window will appear. Note
the frequency stated in the Target Frequency
text, and adjustthe communications test set
to monitor this frequency, Click on the Key Tx
button, and the communications test set will
show the presence of a carrier near the stated
frequency. Note the frequency error and change
the Sonpot Value until the measured frequency
is as close as possible to the stated frequency.
Click on the Program button to same the new
reference oscillator Softpot Value to the radio.
or on the Cancel button to remm to the original
setting. The Service Transmitter window will
appear again at this point. This completes the
adjustment of the reference oscillator The
transmitter may be taken out of Service Mode
and the ampliﬁer module reconnected.
D="'| MT—AE VHF & UHF Receiver Gt Tum Inmcﬁcn Manual
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IMOG-MT-4E-TXRX
Audio Level Alignment
The audio level should be set after all other
alignments have been completed. The
transmitter should be programmed to an analog
channel forthe purposes of the test, since the
vocoder in the transmitter encodes pure sine
signals with a large amount of distortion. The
transmitter's balanced audio input should be
connected to an audio signal generator set up to
deliver a 1 kHz tone at a level of 303 mVRMS (-
8 dBm). The RF output of the transmitter should
be connected to a service monitor set to monitor
the deviation ofthe carrier signal generated
by the transmitter. Click on the Key Tx button
and adjust the Balanced Input Sol'tpot Value
to achieve a deviation of 3 kHz (for a 25 kHz
wide channel) or 1.5 kHz (for a 12.5 kHz wide
channel).
Next. de-key the transmitter and connect the
signal generator with a 1 kHz tone at a level
of 245 mVRMS (-1lJ dBm) to the microphone
connector Pin 2. Click on the Key Tx button
and adjust the Microphone Input Softpot Value
to achieve a deviation of 3 kHz (for a 25 kHz
wide channel) or 1.5 kHz (for a 12.5 kHz wide
channel).
Subtone Level Alignment
The subtone level should be set ether the audio
level alignment has been completed. The
subtone levels are set in the System Setup:
Subtone Deviation Levels tab. Subtone levels
can be set for both nan-remand or wideband.
internally or externally generated. The
transmitter should be programmed to an analog
channel for the purposes of the test. The RF
output of the transmitter should be connected to
a service monitor set to monitor the deviation of
the carrier signal generated by the transmitter.
Internal Subtone Deviation Levels
The subtone ls generated internally by the
CTCSS tone programmed In the Channel
Settings.
External Subtone Deviation Levels
The transmitter's subtone input should be
connected to an audio signal generator set up to
deliver the subtone at a level of 98 mVRMS
(-18 dBm). Remove any inputs from the
balanced or microphone audlo Input.
Click on the Key Tx button and adiust the
appropriate Softpot Value to achieve a devlatlan
of 500 Hz (for a 25 kHz wide channel) or 350 Hz
(for a 12.5 kHz wide channel).
Radio service Somme Tuning
AmpliﬁerAIignment
The RF power output of the amplifier is set to its
rated value at 0.5 to 8.0 W atthe tactory. Thls
should not require adiustment under normal
circumstances.
The RF output of the transmltter should be
connected to a service monitor set to monitor
the power output at the carrier signal generated
by the transmitten A short section of 50 0 low
loss coaxial cable should be used. Click on the
Key Tx button and adjust the Transmitter Output
Power Soﬂpot Value to achieve the deslred RF
power of 0.5 to 8.0 W.
Note: Do not exceed the power input
rating of the external Power Amplifer
when this Transmitter is used as an
exciter.
MT-4E VHF Ct UHF Reulvlr & Transmitter Instruction Manual
lMOB-MTAE-TXRX
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25 i Radio Service Software Tuning
Test Patterns
The Test Patterns allow the transmitter to
generals a number of P25 Test Paltems for
testing purposes.
C4FM Modulation Fidelity Pattem
The standard Transmitter CAFM modulation
ﬁdelity pattem Is a continuously repeating bit
stream deﬁned by the following 24 bit sequence
(010111000001100111101111“).
(Refer to TIA/ElA 102.0MB for perfomtanoe
recommendations).
P25 Test Tone
This pattern produces a standard P25 1011 test
tone. Test set should be set to P25 demodulation
to observe a 1 kHz tone
P25 Test Silence
This pattern produces a standard P25 silence.
Test set should be set to P25 demodulation to
verify silence.
Symbol Rate Pattern
The standard Transmitter symbol rate pattern is
a continuoust repeating bit stream (10 10 00 00
1010 00 00 W) that produces a 1200 Hz tone
with deviation between 2543 Hz and 3110 Hz.
Low Deviation Pattern
The standard Transmitter low deviation pattern is
a continuously repeating bit stream (10 10 00 00
1010 00 00 ...) that produces a 1200 Hz tone
with deviation between 841 Hz and 1037 Hz,
V.52 Pattern
This standard Transmitter test pattern is a
continuously repeating 511 bit binary pseudo
random bit sequence based on ITU-T 0.153
(formerly CCITTV.52).
MT-4E VHF G UHF Reoeiver a Transmittal Instmdion Manual
IMOB—MTAE-TXRX
System Setup: Jumper Settings
MT-4D Pin Compatibility
This setting should always be left as MT-3 I MT-
45 unless the Receiver is being used with an
older (2006 or earlier) Base Controller. When
an older Base Controller is used. the MT-40
selection will set the Clear! Secure pin to be
compatible with the Base Controller.
Synthesizer Reference
This setting allows an oxtemal referenoe to lock
the synthesizer tor high stability in applications
such as simulcast. The lntemal reference must
be used tor all P25 transmissions.
27
HARDWARE TUNING AND
TROUBLESHOOTING
REPAIR NOTE
The MT~4£ Receiver and Transmitter family
employ a high percentage of surface mount
oomponenis which should not be removed
or replaced using an ordinary soldering iron.
Removal and replacement of surfacemount
components should be performed only with
speciﬁcally designed surface mount rework
and repair stations oomplete with Electrostatic
Discharge (ESD) protection
When removing Surface Mount Solder Jumpers,
it is recommended to use solder wick braid in
place of vacuum type rte-soldering tools. This
will help prevent damage in the circuit boards.
MT-4E VHF 8- UHF Raw 8. Transmmsr Intimate" Manual | _-l "'
IMMMT-AE—TXRX D—
23 | l-hrrlware Tuning and Troubleshootilg
RECOMMENDED TEST EQUIPMENT
Alignment of the Receiver and/or Transmitter requires the following test equlpment or its equivalent,
Power suppry - Regulated +95 vac at 2A Phillips PM 2811
Puwer Supply - Regulated +118 VDC at 2 A Toward TPS-4000
Oscilloscope / Multimeter Fluke 97 Scopemeter
Current Meter: Fluke 75 multimeter
Communications Service Monitor (Analog) Marconi Instrumenm 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
relerence (WWVH, GPS, Loren C) so that the high stability local oscillator may be accurately set to
within its 1 1 ppm frequency tolerance.
Complete Receiver and Transmitter Alignment
Acomplete Receiver and TransmitterAlIgnment is performed at the factory and should not be
required under normal circumstances, A large change in Recelver or Transmitter operating frequency.
as discussed in the next section, or a replacement of major Receiver or Transmitter sub-assembly
modules, may require a complete realignment operation.
D=NJ MT-4E VHF 6 UHF Receiver 5. Transmitter Instmotlon Manual
— IMDl—MT-4E-1'XRX
RECEIVER ASSEMBLY
The UDB, Synthesizer and optional Encryption
Board are mounted on the Receiver Main Board.
The RF Preselector is attached with two front
panel screws and one screw through the rear
F connector. An extruded aluminum shell that
slides over the reoe'wer assembly forms an
enclosure. The enclosure is completed by the
installation of side and front panel screws.
Receiver hardware alignment is performed
solely on the RF Preselector. Alignment is
simpliﬁed by using a SR—3 Subrack.
SM-3 System Regulator: and extender card
or cable to provide Receiver power and signal
interconnection.
RECEIVER FREQUENCY
CHANGE
The Receiver is initially aligned at the factory
for the frequency stamped on the Factory Set
Operating Frequency’ label. This label should
list the frequency at which the last complete
Receiver alignment was performed.
A small frequency change of less than
2 2.0 MHz from the frequency stamped on the
frequency label will generally not require any
adjustment.
Changes greater than 1 2.0 MHz from a
previously tuned working receive frequency
will require RF Preselector alignment using
the tuning procedure outlined below. Failure to
perform a realignment alter a large frequency
change could result in unreliable Receiver
operation or operation that does not conform to
the published speciﬁcations.
Hardware Tuning and Troubleshooting 29
Change the frequency using the Radio
Programming Sohware package. Verify that
the Receiver sensitivity is - -11B dBm for 12 dB
SINAD. Slight adjustment of the RF Preselector
tuning capacitors (5) may be performed to
maximize sensitivity at me new frequency. Be
aware that the preferred RF Preselectorluning
procedure requires swept frequency response
measurement of the RF Preselector filter in
order to provide a maximally flat response
over a range or input frequencies, with the
primary channel frequency centered in the
ﬁlter passband. This alignment approach is not
mandatory for single channel operation.
Alignment for the RF Preselector consists of
tuning the ﬁve section preselector ﬁlter only.
No tuning is required for frequency changes
within the 3 dB bandwidth of its originally
tuned frequency (5 MHz for VHF and 7 MHz
for UHF); although, without mning at the 3 dB
band edges, the Receivers sensitivity will be
degraded. For frequency changes outside of the
RF Preselectbr's 3 dB bandwidth, use the tuning
procedure outlined below.
MT4E VHF a UHF Receiver 3. Transmitter lnsmiaian Manual 1 n="
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IMﬂO—MT-AE—TXRX
30 1 Hardware Tuning and rrouueshooﬁm
RECEIVER RF ALTERNATE TUNING
PRESELECTOR TUNING PROCEDURE
PROCEDURE The alternate method oftuning the RF
. Preeelector is to monitor Reoelver S|NAD. Thls
The best way ‘° tune the RF Freselector K tuning procedure is typically used when the
‘° “59 a Spectrum Analyzer With a tracking Receiver only has a single RF frequency. Use
generator. The frequency response of the th foll » d for SINAD uenc
Preselector Filter can be seen at the IF output. tuzingzwmg prooe ure freq y
Use the following procedure for swept frequency
tumng. 1. Check that the +95 VDC rod Wire is connected
— to the RF Preselector from the Receiver Main
1. Check that the -09.5 VDC red wire is connected Board.
to the RF Preselector trom the Receiver Main —
Board. 2. Inject the desired RF frequency into the RF IN
m— oonnector on the Receiver front panel at a level
2. Donnact the Tracking Generator output to the of 415 dBm.
RF Preselector’s RF input (the RF IN. N type —
connector on me Receiver from panel). 3. Ensure the synthesizer is connected to the L0
input otthe RF Preselector.
3. The tracking generator should have an output
level 01 40 dBm (01839 A) 0? 40 dBm (class 5) 4. Adiuct the helical ﬁlter trimmer capacitors for best
and a frequency span of at least 10 MHz. lithe “we, sumo (> 415 dBrn).
preselector ﬁlter is grossly misaligned, a larger
frequency span may be required.
4. Disconnect the RF Preselector's IF output
from the Receiver Main Board. and connect it
to the Tracking Generator input. The IF mm
is en SMB connector and will likely require an
adapter to connect to the Tracking Generator.
The Tracking Generator frequency will be the
Reoeiver's RF frequency
5. Adjust the helical ﬁller trimmer capau'tors for
a ﬂat response centered at the desired RF
frequency. The measured input level should
be approximately -25 or -30 dam and the 3 dB
bandwidth should be 5 MHz and 7 MHz in me
VHF and UHF range respectively.
6. Once the RF Preselector is tuned, reconneﬁ the
RF Preselector’s IF ouwut back to the Receiver
Main Board.
D=N| MT—4E VHF a. UHF Receiver & Transmitter Instrudion Manual
— lMOs—MT-4E-TXRX
TRANSMITTER ASSEMBLY
The UDBI Synthesizer and optional Encryption
Board are mounted on the Transmitter Main
Boards The RF Ampliﬁer module is secured on
the Transmitter Main Board by screws, and an
enclosure is formed by an extruded aluminum
shell that slides over the Transmitter Main
Board . This shell also serves as a heat sink to
remove heat from the Ampliﬁer module and for
this reason, it is important that the four screws
that bond the shell to the ampliﬁer module
be installed before prolonged operation of
the transmitter. Moreover. the surface of the
Ampliﬁer module that contacts the shell should
be clean and free of foreign material.
Transmitter hardware alignment is performed
salary on the Ampliﬁer. Alignment is simpliﬁed
by using a SR-3 Subraok, SM-3 System
Regulator, and extender card or cable to provide
Transmitter power and signal interconnection.
Hardware Tuning and Tmubleshootiua | 31
TRANSMITTER FREQUENCY
CHANGE
The Transmitter is initially aligned at the factory
for the frequency stamped on the ‘Factory Set
Operating Frequency’ label. This label should
list lhe frequency at which the last complete
Transmitter alignment was performed.
A small frequency change of less than
t 05 MHz from the frequency stamped on the
frequency label will generally not require any
adjustment.
Changes greater than at 045 MHz from a
previously tuned working transmit frequency will
require VSWR alarm I overload alignment using
the tuning procedure outlined below. Failure to
perform a realignment after a large frequency
change could result in unreliable Transmitter
VSWR alarm / overload operations
When the VSWR alarm / overload circuit is
properly set. the Ampliﬁer is protected from
excessive antenna VSWR by reducing the
ampliﬁer's gain when an overload condition
occurs. If the VSWR alarm is not set, the
ampliﬁer is still proteded by a current limiter
circuit. The circuit limits Ampliﬁer current draw to
20 A and protects the Amplifier from damage
MT-4E VHF a. UHF Receiver 5. Transmmer instruction Manual | D=ﬂ
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IMOG—MT-4E- XRX
32 I Hardware Tuning and Troubleshooting
DE
TRANSMITTER AMPLIFIER TUNING PROCEDURE
The TransmitterAmpIiﬁer requires 0 dBm of input power and is continuously adjustable over its pwer
range of 0.5 to 8.0 W. The ampliﬁer provides Output Power and Antenna VSWR Alarm outputs (open
drain; active low) through the transmitterto the Motherboard. The ampliﬁer's output power level and
alarm level can be set without detaching the ampliﬁer from the transmitter board.
Transmitter Ampliﬁer Adjustment
The RF output and VSWR alarm threshold level adjustments are easily accessible so that ﬁne
adjustments can be made in the ﬁeld. The forward power alarm does not require alignment
Depending on user requirements, the VSWR alarm threshold level should be checked whenever
a signiﬁcant change in operating frequency (1 0.5 MHz) is rnade. As the antenna VSWR alarm is
dependent on the ontput power. the output power should always be set ﬁrst The order of adjustment
should be:
1, Set the output power.
Set the desired Transmitter VSWR alarm level,
3. Test the Transmitter Overload.
Verify Transmitter Current Dram
Initial Set-Up
step Reference Action Desired Resth Notes
1 Trensmmer RF output Connect to radio Use short sedion of
connector communications test set low loss 50 n coaxial
cable
2 Potentiometers Turn lulty COW Initial starting point
RV1 & RV3
3 MT-4E Rss Software click “Kay Tx', and Desired Transmitter RF Transmitter RSS
adjust slider Oumut Power software - Service -
Power Levels
"' MT-4E VHF 8x UHF Raoeiver A Tranunmar lnshualon Manual
IMOB-MT-4E-TXRX
Transmitter VSWR Alarm (Reverse Power)
Hamare Tuning and Troublenhooﬁng 33
Step Reference Action Desired Results Notes
1 Transm'mer Disconnect the tast
set and terminate the
Tramitterwith a 3:1
mismatch load
2 Connector J1 Connect a voltmeter to
Pin 5 doonnedor J1
3 RV3 Adjust CW Until Pin 5 reads +25 VDC,
or a noticeable drop (10 $6
of total curent or more) in
current on the +133 VDC
line occurs
4 Transmitter RF output Connect to radio Pin 5 should read Use snort section
connector communications test approximately 0 VDC of low loss 50 0
set coaxial cable
Transmitter Overload Test
Step Ratsrence Actm' n Desired Results Notes
1 Ampliﬁer Disconnect radio Ampliﬁer terminated with an
communications test open circuit
set
2 +118 VDC supply Monitor current Notioeable drop (1 D “A of
total current or more) in
“3,8 VDC wrrent
3 Ampliﬁer Reconnea radio MM VDC current should
communications teat return to previous level
set
Transmitter Current Draw Veriﬁcation
Step Reference Action Desired Results Notes
1 M 3.8 VDC suppty Current < 2.0 A When transmitting
2 +95 VDC supply Current < 0.2A When transmitting
MT-AE VHF & UHF Reeelver &Tranamitrer Instruction Manual
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lMOB-MT-4E-TXRX | D=
34 ‘ Hardware Tuning and Troubleshooting
RECEIVER JUMPERS
Receiver Main Board
Jumper Default Position Function I Description
JU1 OUT When installed enables Clear Keys 1 Input
JU2 OUT When installed enables Clear Keys 2 Input
JU3 IN When installed enables power to Discriminator Output ampliﬁer
JUS OUT When installed bypasses capaoihnoe ooupling on the Discriminator output
Ju7 OUT When installed enables power to Diecriminetor Output LPF ampliﬁer
JUQ X X: 800 0 Audio Transformer
Y: Bypass Transformer
JU10 X X: 600 0 Audio Transformer
v: Bypass Transiormer
JU11 lN When installed enables power to Balanced Audio Output ampliﬁer
JU12 OUT When installed inoreasee the gain of Balanced Audio Output ampliﬁer
Ju13 OUT When installed selects 600 a resistance to ground
JU14 X X: 600 n Audio Transfomier
Y: Bypass Tranelomier
Jumpers are shown on the MT~4E Receiver Jumper and Test Point Locator Illustrations
D=" MT-4E VHF 5 UHF Receiver & Tnnlmiltor lnstmotion Manual
- IMD!—MT—4E»TXRX
PENN/Ito Tuning and Troubleshooting
TRANSMITTER JUMPERS
35
Transmitter Main Board
Jumper Default Position Functlon l Description
Ju1 X X: AID Front Panel Switch seleds transmitterA/D mode
Y: AID External Input seleas transmitterA/D mode
JUZ Y X: MIC OUT connects to Microphone Audlo Input
Y: MIC IN connects to Microphone Audlo Input
.IU3 x X: 500 “Audio Trenstomler
Y: Bypass Transformer
JUA IN When installed selects 600 (1 resistance to ground
JU5 IN When installed enables clear Keys 1 Input
Jus IN When installed enables Clear Keys 2 Input
JU7 X X: 600 0 Audio Transformer
Y: Bypass Transformer
JU8 X X: 500 nAuoio Transformer
Y: Bypass Transformer
JU9 OUT When installed bypasses capacitance coupling on the Subtone I Direct
Modulation Input
Jumpers are shown on the MT-4E Transmitter Jumper and Test Point Locator Illustrations.
FRONT PANEL RJ45 JACK PINOUTS
Asingle, 8 position RJ45 jack is mounted on the front panel of the receiver and transmitter. The
following are the connections on the RJ45 jack.
Pin
mﬂmmeuN—x
Signal
CRYPTO MODULE KF
UNUSED SPARE
ANALOG COR / P'I'I’
LVDS DATA A
LVDS DATA 5
DIGITAL COR / PTT
N0 CONNECTION
NO CONNECTION
MT-4E VHF t!- UHF Relative! & Trlnsmllur Instmmion Manual
IMﬂA-MT-AE-TXRX
IDE"

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Codan Radio Communications UT-4E500 MT-4E T-Band (470 to 512MHz) Transmitter User Manual Part 1

Codan Radio Communications MT-4E T-Band (470 to 512MHz) Transmitter Part 1

Contents

User Manual Part 1

FCC ID Filing: H4JUT-4E500

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