Daniels Electronics Ltd. VR-3H Bedienungsanleitung
DANIELS
ELECTRONICS LTD.
TM
MT-3 RADIO SYSTEMS
VHF ENHANCED
EXTRA WIDEBAND
RECEIVER
INSTRUCTION MANUAL
V
R
-3H 29 - 50 MHz
Covers model: VR-3H035-SWA, VR-3H045-SWA
Converted for 50 kHz Channel spacing
Copyright ©2003 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored
in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or
otherwise, without the prior written consent of Daniels Electronics Ltd.
DE™ is a registered trademark of Daniels Electronic Ltd. registered in the U.S. Patent and Trademark Office.
Daniels Electronics Ltd.
Revision Date: Aug 2003 Victoria, BC
Revision: 1-1-0
Document No.: IM10-VR3H040-AB PRINTED IN CANADA
DANIELS
ELECTRONICS LTD.
TM
ii VHF Enhanced Extra Wideband Receiver Instruction Manual IM10-VR3H040-AB
DOCUMENT CONTROL:
This document has been produced, verified and controlled in accordance with
Daniels Electronics’ Quality Management System requirements.
Please report any errors or problems to Daniels Electronics’ Customer Service
Department.
NOTE:
The user's authority to operate this equipment could be revoked through any
changes or modifications not expressly approved by Daniels Electronics Ltd.
The design of this equipment is subject to change due to continuous
development. This equipment may incorporate minor changes in detail from
the information contained in this manual.
DANIELS
ELECTRONICS LTD.
TM
VHF Enhanced Extra Wideband Receiver Instruction Manual IM10-VR3H040-AB iii
TABLE OF CONTENTS
Page
1 GENERAL................................................................................................................. 1-1
1.1 Introduction........................................................................................................ 1-1
1.2 VR-3H040 Extra Wideband Receiver Family Models...................................... 1-1
1.3 Manual Organization ......................................................................................... 1-2
1.4 Performance Specifications ............................................................................... 1-3
1.4.1 General........................................................................................................... 1-3
1.4.2 Enhanced Front End Performance Specifications ......................................... 1-5
1.4.3 Enhanced Synthesizer Performance Specifications....................................... 1-5
1.4.4 Physical Specifications .................................................................................. 1-6
2 SYSTEM OVERVIEW ............................................................................................. 2-1
2.1 Receiver Operation ............................................................................................ 2-1
2.2 Frequency Selection........................................................................................... 2-2
2.3 Receiver Assembly and Adjustment.................................................................. 2-3
2.3.1 Complete Receiver Alignment....................................................................... 2-3
2.3.2 Frequency Change ......................................................................................... 2-4
2.3.3 Minor Frequency Change .............................................................................. 2-5
2.3.4 Major Frequency Change .............................................................................. 2-5
2.4 21.4 MHz IF/Audio Main Board ....................................................................... 2-6
2.5 Enhanced Front End .......................................................................................... 2-6
2.6 Enhanced Synthesizer........................................................................................ 2-7
2.7 Receiver Front Panel Illustration ....................................................................... 2-8
2.8 MT-3 Receiver Case – Exploded View............................................................. 2-9
2.9 VR-3H040 Family Enhanced Receiver Block Diagram.................................. 2-10
3 THEORY OF OPERATION ..................................................................................... 3-1
3.1 21.4 MHz IF / Audio Main Board ..................................................................... 3-1
3.1.1 General........................................................................................................... 3-1
3.1.2 Power Supplies .............................................................................................. 3-1
3.1.3 IF Buffer Board.............................................................................................. 3-1
3.1.4 First IF Amplifier........................................................................................... 3-2
3.1.5 Second IF / Demodulation ............................................................................. 3-2
3.1.6 Received Signal Strength Indicator (RSSI) ................................................... 3-2
3.1.7 Audio Processing ........................................................................................... 3-3
3.1.8 Post Discriminator Filtering .......................................................................... 3-4
3.1.9 Squelch Circuitry ........................................................................................... 3-5
3.1.10 COR Outputs.................................................................................................. 3-6
3.1.11 Channel Selection .......................................................................................... 3-7
3.2 Enhanced Front End .......................................................................................... 3-8
3.2.1 General........................................................................................................... 3-8
3.2.2 Power and Interconnection ............................................................................ 3-8
3.2.3 Preselector Filter............................................................................................ 3-8
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ELECTRONICS LTD.
TM
iv IM10-VR3H040-AB VHF Enhanced Extra Wideband Receiver Instruction Manual
3.2.4 RF Amplifier.................................................................................................. 3-9
3.2.5 Image Rejection Filter ................................................................................... 3-9
3.2.6 Local Oscillator Filter.................................................................................... 3-9
3.2.7 Double Balanced Mixer................................................................................. 3-9
3.3 Enhanced Synthesizer...................................................................................... 3-10
3.3.1 Internal Power and Control (Digital Board) ................................................ 3-10
3.3.2 Common Analog Board Circuitry................................................................ 3-10
3.3.3 29 - 71.4 MHz Analog Board Circuitry....................................................... 3-12
3.3.4 Synthesizer Digital Circuitry (Digital Board) ............................................. 3-13
3.4 Frequency Control ........................................................................................... 3-13
3.4.1 BCD Switch Frequency Control.................................................................. 3-13
3.4.2 Synthesizer Base and Frequency Increment Table...................................... 3-14
3.4.3 5.0/6.25 kHz Channelization. ...................................................................... 3-14
4 RECEIVER ALIGNMENT ....................................................................................... 4-1
4.1 General............................................................................................................... 4-1
4.2 Repair Note........................................................................................................ 4-1
4.3 Printed Circuit Board Numbering Convention .................................................. 4-2
4.4 Recommended Test Equipment......................................................................... 4-2
4.5 Synthesizer OS-3, OS-3H)................................................................................. 4-3
4.5.1 VHF OS(R/T)-3H 29 - 71.4 MHz VCO Alignment ...................................... 4-3
4.6 Front End Tuning............................................................................................... 4-5
4.7 Main Board Tuning............................................................................................ 4-6
4.7.1 IF Amplifier Bias Current Adjustment .......................................................... 4-6
4.7.2 21.4MHz ........................................................................................................ 4-6
4.7.3 Audio Levels.................................................................................................. 4-6
4.7.4 Distortion and Sensitivity .............................................................................. 4-7
4.7.5 Second IF / Demodulation ............................................................................. 4-7
4.7.6 Squelch Window............................................................................................ 4-8
5 RECEIVER CONFIGURATION AND TEST POINTS........................................... 5-1
5.1 21.4 MHz IF / Audio Main Board Factory Settings .......................................... 5-1
5.1.1 The 21.4 MHz IF/Audio Main Board Configuration: ................................... 5-1
5.1.2 The 21.4 MHz IF/Audio Main Board Configuration Jumper Settings.......... 5-1
5.1.3 Test Points ..................................................................................................... 5-2
5.1.4 Power Supplies .............................................................................................. 5-3
5.1.5 21.4 MHz IF / Audio Board Interconnect Pin Definitions ............................ 5-4
5.2 Enhanced Front End Test Points....................................................................... 5-4
5.3 OS(R/T)-3(A/H) Synthesizer Factory Configuration ........................................ 5-5
5.3.1 Jumper Configuration .................................................................................... 5-5
5.3.2 Synthesizer Test Points.................................................................................. 5-6
DANIELS
ELECTRONICS LTD.
TM
VHF Enhanced Extra Wideband Receiver Instruction Manual IM10-VR3H040-AB v
6 ILLUSTRATIONS AND SCHEMATIC DRAWINGS ............................................ 6-1
6.1 21.4 MHz IF/Audio Board Component Layout (Bottom) – Extra Wideband... 6-1
6.2 21.4 MHz IF/Audio Board Component Layout (Top) – Extra Wideband......... 6-2
6.3 21.4 MHz IF/Audio Board Schematic Diagram – Extra Wideband.................. 6-3
6.4 21.1 MHz FM IF Buffer Component Layout .................................................... 6-5
6.5 21.1 MHz FM IF Buffer Schematic Diagram.................................................... 6-5
6.6 Enhanced Front End Block Diagram................................................................. 6-6
6.7 BandPass Filter Component Layout .................................................................. 6-6
6.8 BandPass Filter Schematic Diagram ................................................................. 6-6
6.9 Enhanced Front End Schematic Diagram – Extra Wideband............................ 6-7
6.10 Enhanced Front End Component Layout – Extra Wideband ............................ 6-9
6.11 Synthesizer Analog PCB Component Layout (Bottom) – Extra Wideband.... 6-10
6.12 Synthesizer Analog PCB Component Layout (Top) – Extra Wideband ......... 6-11
6.13 Synthesizer Analog PCB Schematic Diagram – Extra Wideband................... 6-12
6.14 Synthesizer Digital PCB Schematic Diagram – Extra Wideband ................... 6-13
6.15 Synthesizer Digital PCB Component Layout (Bottom) – Extra Wideband .... 6-14
6.16 Synthesizer Digital PCB Component Layout (Top) – Extra Wideband.......... 6-15
7 PARTS LISTS ........................................................................................................... 7-1
7.1 Electrical Parts Lists .......................................................................................... 7-1
7.1.1 21.4 MHz IF/Audio Main Board ................................................................... 7-1
7.1.2 IF Buffer Board.............................................................................................. 7-8
7.1.3 Enhanced Front End ...................................................................................... 7-8
7.1.4 FE BandPass Filter ...................................................................................... 7-10
7.1.5 Enhanced Synthesizer Analog Board .......................................................... 7-11
7.1.6 Enhanced Synthesizer Digital Board ........................................................... 7-14
7.2 Mechanical Parts.............................................................................................. 7-16
7.2.1 21.4 MHz IF/Audio Main Board ................................................................. 7-16
7.2.2 Enhanced Front End .................................................................................... 7-17
7.2.3 Enhanced Synthesizer.................................................................................. 7-17
8 CHANNEL DESIGNATION TABLES .................................................................... 8-1
8.1 Channel Designation Table: 29-50 MHz, 5kHz Increments ............................. 8-1
8.2 Channel Designation Table: 29-50 MHz, 6.25kHz Increments ...................... 8-13
9 REVISION HISTORY .............................................................................................. 9-1
DANIELS
ELECTRONICS LTD.
TM
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DANIELS
ELECTRONICS LTD.
TM
VHF Enhanced Extra Wideband Receiver Instruction Manual IM10-VR3H040-AB 1-1
1GENERAL
1.1 Introduction
The VR-3H040 Enhanced Extra Wideband Receiver family provides high performance
synthesized FM reception in 50 kHz channels in one of two frequency bands: 29 to 38 MHz or
38 to 50 MHz. A modular design allows each of the receiver's three internal modules; 21.4 MHz
FM IF/Audio Main Board, FE3H Enhanced Front End, and OS-3H Synthesizer to be
individually assembled and tested. This facilitates construction, tuning, and general receiver
maintenance. The internal synthesizer module may be programmed with up to 16 channels for
remote frequency control applications.
The VR-3H040 Receiver family combines state of the art performance in a compact modular
enclosure for applications ranging from remote mountain top repeaters to congested urban radio
environments. Each receiver module is characterized by dependable, low maintenance
performance under the most severe environmental conditions.
The VR-3H040 modular receiver family is compatible with all Daniel’s subrack and base station
enclosures.
1.2 VR-3H040 Extra Wideband Receiver Family Models
There are two distinct receiver models in the VR-3H040 Extra Wideband Receiver family
covering 29 to 38 MHz and 38 to 50 MHz bands respectively while operating in 12.5 kHz or
20/25 kHz occupied channel bandwidths. The two models are as follows:
• VR-3H035-SW- synthesized, 29-38 MHz band, Converted for 50 kHz Channel spacing
• VR-3H045-SW- synthesized, 38-50 MHz band, Converted for 50 kHz Channel spacing
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ELECTRONICS LTD.
TM
1-2 IM10-VR3H040-AB VHF Enhanced Extra Wideband Receiver Instruction Manual
1.3 Manual Organization
The organization of this document reflects the modular construction of the VR-3H040 family of
products. Each Section (e.g. Theory of Operation, Alignment, etc.) contains “subsections”
specific to each electronics module.
In general, this instruction manual includes the following information for the VR-3H040
Receiver and for each of its electronics modules:
1. A functional description and specifications summary.
2. A detailed technical description (Theory of Operation).
3. Assembly, setup and alignment procedures.
Along with a system overview of the entire receiver, information for the following electronic
modules is contained within this document:
21.4 MHz FM IF / Audio Main Board Instruction Manual: This manual provides complete
information on the operation of the 21.4 MHz FM IF / Audio Main Board. The bulk of the
material relating to receiver operation and installation can be found within this manual. The
majority of receiver options, including channel selection, are accessed through the FM IF /
Audio Main Board. In addition, most of the external receiver connections are made through the
FM IF / Audio Main Board.
FE3H Front End Instruction Manual: This manual provides information on alignment and
operation of the FE3H Front End Module. The Front End module provides filtered low level RF
signal amplification and down conversion to the IF frequency of 21.4 MHz.
Enhanced Synthesizer Instruction Manual: This manual provides information on alignment and
operation of the Enhanced Synthesizer Module. The synthesizer module provides the low noise
first local oscillator signal to the FE3H Front End module.
VR-3H 29 - 50 MHz Channel Designation Tables: This manual provides tabular frequency /
channel number assignment.
DANIELS
ELECTRONICS LTD.
TM
VHF Enhanced Extra Wideband Receiver Instruction Manual IM10-VR3H040-AB 1-3
1.4 Performance Specifications
1.4.1 General
Type: MT-3 Series Synthesized Receiver.
Family: VR-3H040 Converted for 50 kHz Channel spacing
Compatibility: MT-3 Series Radio Systems
Frequency Range: 29 to 38 MHz or 38 to 50 MHz.
System Impedance: 50 Ω(Type N connector).
Frequency Generation: Synthesizer Module (Internal).
Channel Spacing: Converted to 50 kHz
System Deviation: ± 15 kHz
Channel Selection: In 5.0 or 6.25 kHz increments selected through four
internal BCD rotary switches.
Number of Channels: Preset capability for 16 channel memory selectable through
four external logic control lines.
Channel Switching Range: ±1 MHz. (38 - 50 MHz, No tuning adjustment)
±0.5 MHz. (29 - 38 MHz, No tuning adjustment)
Reference Sensitivity: -114 dBm (typically -116 dBm) for 12 dB SINAD.
Local Oscillator Frequency Stability: ±5 ppm; -30°C to +60°C. Provision for external 10.0 MHz
reference input.
First IF 21.4 MHz, 8 pole crystal filter.
Second IF 455 kHz
Adjacent Channel Selectivity: 90 dB; 50 kHz channel.
Conducted Spurious + Harmonics: 95 dB
Intermodulation Rejection: 75 dB (typical 80 dB); as per TIA/EIA 603
Hum and Noise: 60 dB; 20 kHz LPF
DANIELS
ELECTRONICS LTD.
TM
1-4 IM10-VR3H040-AB VHF Enhanced Extra Wideband Receiver Instruction Manual
Audio Output: 600 Ωbalanced or unbalanced line output;
De-emphasis output, +3 dBm maximum level;
Flat response output, +3 dBm maximum level;
Audio Distortion: Less than 3.0% (typical < 2%) THD at +25°C;
less than 3.5% THD, -30°C to +60°C.
De-emphasized Audio Response: +1, -2 dB; (500 Hz to 2.8 kHz)
+1, -3 dB (300 Hz to 3 kHz
Flat Audio Response: +1, -1 dB; (300 Hz to 3 kHz)
Squelch Hysteresis: Adjustable from 2 dB to 20 dB.
Squelch Threshold: Adjustable from -123 to -105 dBm.
Squelch Operation: Noise based (standard) or optionally configured RSSI
controlled.
Front Panel Controls: Receiver power On (Norm) / Off.
Squelch Disable (Push-button).
COR Interface: 2 amp, 50 V open drain power MOSFET;
100 mA, 30V opto-isolator (optional);
2 amp, form C electro-mechanical relay (Optional).
Supply Voltage: +9.5 Vdc (Supplied by SR-3 Subrack or SM-3 System
Monitor Supply).
Supply Current: Normal programmed options less than 385 mA.
Operating Temperature Range: -30°C to +60°C Standard;
Dieses Handbuch passt für folgende Modelle
2
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