Futurecom DVRS User manual

January 2019 Page 1 of 94
Futurecom Systems Group, ULC
DVRS
User’s Guide

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 2 of 94
NOTES

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 3 of 94
Contents
Contents ........................................................................................................................3
Foreword........................................................................................................................8
Manual Revisions........................................................................................................8
Firmware.....................................................................................................................9
Computer Software Copyrights....................................................................................9
Document Copyrights..................................................................................................9
Disclaimer ...................................................................................................................9
Trademarks.................................................................................................................9
Commercial Warranty and Service ............................................................................10
Notations Used in This Manual ..................................................................................11
Declaration of Conformity ..........................................................................................12
RF Energy Exposure Compliance, Awareness and Control Information and
Operational Instructions.............................................................................................13
Introduction.................................................................................................................14
Identifying Your DVRS Model....................................................................................15
Frequency Band of Operation............................................................................................... 15
Cross-Band........................................................................................................................... 15
In-Band.................................................................................................................................. 18
Band Locking ........................................................................................................................ 21
P25 Tactical Repeater with Backpack option ....................................................................... 22
DVRS Operation Basics..............................................................................................23
DVRS Features by PSU Type –Motorola Infrastructure............................................24
‘DVRS Enabled’ PSU Features Support in Non-Motorola Infrastructure....................25
Powering up the DVRS..............................................................................................26
Turning ON the DVRS...............................................................................................26
Activating the DVRS via the Control Head ........................................................................... 26
Automatic DVRS Activation (AVRA)..................................................................................... 27
Remote Activation of the DVRS............................................................................................ 28
Turning OFF the DVRS.............................................................................................30
Deactivating the DVRS via the MSU Control Head.............................................................. 30
Deactivating the DVRS via Call Alert sent by Dispatch........................................................ 30
Automatic DVRS Deactivation.............................................................................................. 31
DVRS Status Display.................................................................................................32
DVRS Enabled PSUs................................................................................................33

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
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DVRS Status Tones ..................................................................................................34
DVRS Status Tones - MSU Speaker.................................................................................... 34
DVRS Status Tones - PSU................................................................................................... 35
‘DVRS Enabled’ Mobile Radio TGs / Channels..........................................................37
‘DVRS Disabled’ Mobile Radio TGs / Channels.........................................................37
In Car Monitor (ICM)..................................................................................................38
Primary / Secondary Operation Basics......................................................................39
Permanent Primary Activation .............................................................................................. 41
Permanent Primary Deactivation.......................................................................................... 41
Legacy Mobexcom II Voting Compatibility Mode.................................................................. 41
DVRS Modes of Operation........................................................................................42
OFF Mode............................................................................................................................. 42
SYSTEM Mode ..................................................................................................................... 42
LOCAL Mode ........................................................................................................................ 43
Selecting DVRS Mode...............................................................................................44
Selecting DVRS Mode from the Control Head...................................................................... 44
Strapped DVRS Mode .......................................................................................................... 44
Selecting DVRS Channel ..........................................................................................44
Independent DVRS Channel Change................................................................................... 44
Strapped DVRS Channel Change ........................................................................................ 44
MSU Scan.................................................................................................................46
Supported MSU Scan Types ................................................................................................ 46
DVR Enabled / Disabled Rules while MSU Scan is enabled................................................ 46
Outbound Calls (received by MSU from the FNE) with MSU Scan Enabled........................ 46
Inbound Calls (received by DVRS from PSU) with MSU Scan Enabled .............................. 46
MSU ISSI Roaming ...................................................................................................47
Unsupported PSU Features.......................................................................................47
P25 Digital Mode Operation........................................................................................49
PSU Affiliation ...........................................................................................................50
Group Calls...............................................................................................................50
MSU Priorities ...........................................................................................................50
PSU Proxy Request Priorities....................................................................................50
Signaling Request Interactions with Voice and Signaling Proxy.................................51
Voice Request Interaction with Signaling and Voice Proxy........................................52
MSU Voice and Signaling Proxy Interactions.............................................................54
Talk Group Proxying..................................................................................................54
Talk Group Translation..............................................................................................54
Private Calls..............................................................................................................55
PSU Talk Permit Tones.............................................................................................55
Status Broadcast.......................................................................................................55

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
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Local Mode Indication................................................................................................56
Radio Check / Inhibit .................................................................................................56
P25 Trunking OTAR..................................................................................................56
Patch.........................................................................................................................56
Dynamic Regrouping.................................................................................................57
Phone Interconnect ...................................................................................................57
Adaptive Power Control.............................................................................................57
Digital Audio Buffering...............................................................................................57
P25 Encryption..........................................................................................................58
Remote DVR Activation and Steering by PSU Call Alert (Page)................................59
Emergency in Digital Mode........................................................................................61
Emergency Alarm ................................................................................................................. 61
Emergency Call..................................................................................................................... 62
Emergency Revert through DVR .......................................................................................... 62
Emergency Revert through PSU .......................................................................................... 62
Emergency operation during TG Translation........................................................................ 62
Fireground (FG) Signaling.........................................................................................63
PSU IV&D .................................................................................................................63
PSU Location Reporting............................................................................................63
PSU Call Alert ...........................................................................................................63
PSU Message ...........................................................................................................63
PSU Status Update and Status Request ...................................................................63
Automatic PSU Revert to Talk Around (TA)...............................................................64
PSU Group Services .................................................................................................64
Group Text............................................................................................................................ 64
Group Alias Update............................................................................................................... 65
Digital Mode –Summary of Features ........................................................................66
Digital DVR Mode with P25 Trunking Mode Selected on MSU............................................ 66
Digital DVR Mode with P25 Conventional Mode Selected on MSU..................................... 67
Forced Analog Mode...................................................................................................68
Leading & Trailing Tones...........................................................................................68
Forced Analog All DVR Mode- Operation and Programming Overview .....................69
Forced Analog Mode –Summary of Features ...........................................................70
Forced Analog DVR Mode with Conventional Analog Mode Selected on MSU................... 70
Forced Analog DVR Mode with 3600 Trunking Mode Selected on MSU............................. 71
Forced Analog DVR Mode with P25 Trunking TDMA Mode Selected on MSU ................... 72
Analog Mode Operation..............................................................................................73
DVR Channel Setup for Analog Mode.......................................................................73

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
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Group Calls...............................................................................................................73
Emergency in Analog Mode.......................................................................................74
Emergency Alarm ................................................................................................................. 74
Emergency Call..................................................................................................................... 74
Emergency Revert through DVR ...............................................................................75
Analog Audio Buffering..............................................................................................75
Tactical Public Safety (TPS)......................................................................................75
Fireground (FG) Signaling.........................................................................................75
Remote DVRS Activation via DTMF..........................................................................76
P25 Encryption in Analog Mode ................................................................................76
Mobile Mode Steering via PL/DPL.............................................................................76
Steering and Emergency ...................................................................................................... 76
MSU Operating on TDMA (P25, Phase 2).................................................................77
Analog Mode –Summary of Features.......................................................................78
Analog DVR Mode with P25 Trunking Mode Selected on MSU........................................... 78
Analog DVR Mode with P25 Conventional Mode Selected on MSU.................................... 79
Analog DVR Mode with Conventional Analog Mode Selected on MSU............................... 80
Analog DVR Mode with 3600 Baud Analog or Digital Trunking Mode Selected on MSU .... 81
Analog DVR Mode with P25 Phase II (TDMA) Trunking Mode Selected on MSU............... 82
Mixed DVRS Mode.......................................................................................................83
Special Features Support ...........................................................................................84
TPS Signaling ...........................................................................................................84
Troubleshooting..........................................................................................................85
Appendix 1 –DVR Specifications ..............................................................................86
Contact Information....................................................................................................88
Glossary.......................................................................................................................89
Index ............................................................................................................................92

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 7 of 94
List of Tables
Table 1 DVRS vs Infrastructure Compatibility................................................................14
Table 2 DVRS Features vs Type of PSU.......................................................................24
Table 3 'DVRS Enabled' PSU Features Support on Non-MSI Infrastructure..................25
Table 4 AVRA Functionality...........................................................................................27
Table 5 DVRS Status Display Messages / Icons...........................................................32
Table 6 DVRS Enabled PSU Models.............................................................................33
Table 7 DVRS Status Tones (MSU Speaker)................................................................34
Table 8 P25 DVRS Enabled PSUs –DVRS Specific Tones..........................................35
Table 9 Analog PSU - DVRS Specific Tones.................................................................36
Table 10 Primary DVR Definitions.................................................................................40
Table 11 OFF Mode DVRS Basic Operation.................................................................42
Table 12 SYSTEM Mode DVRS Basic Operation..........................................................42
Table 13 LOCAL Mode DVRS Basic Operation.............................................................43
Table 14 MSU Proxy Request Priorities ........................................................................50
Table 15 PSU Proxy Request Priorities.........................................................................50
Table 16 Signaling Request Interaction with Signaling Proxy........................................51
Table 17 Signaling Request Interaction with Voice Proxy..............................................51
Table 18 Voice Request Interactions with Signaling Proxy............................................52
Table 19 Voice Proxy Interaction with Voice Proxy........................................................53
Table 20 Inbound P25 Encryption Rules .......................................................................58
Table 21 Outbound P25 Encryption Rules.....................................................................58
Table 22 MSU MIC PTT P25 Encryption Rules.............................................................58
Table 23 Typical Remote Steering Scenarios................................................................60
List of Figures
Figure 1 Cross-Band Full Duplex & Simplex Capable DVRS - Conceptual Diagram......15
Figure 2 Cross-Band Simplex Only Capable DVRS - Conceptual Diagram ...................16
Figure 3 Vehicular Mount Cross Band DVRS Model –Full Duplex & Simplex Capable.17
Figure 4 Vehicular Mount Cross Band DVRS Model - Simplex Only Capable ...............17
Figure 5 In-Band Full Duplex / Simplex Capable DVRS - Conceptual Diagram.............19
Figure 6 In-Band Simplex Only Capable DVRS - Conceptual Diagram .........................19
Figure 7 Vehicular Mount In-Band 700 or 800MHz DVRS Model - Full Duplex & Simplex
Capable..................................................................................................................20
Figure 8 Vehicular Mount In-Band VHF or UHF DVRS Model - Full Duplex & Simplex
Capable..................................................................................................................20

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 8 of 94
Foreword
This manual provides User guidelines for the Futurecom P25 Digital Vehicular Repeater
(DVR) interfaced to a remote mount Motorola APX mobile radio:
Mobile Radio Model
Firmware Requirements
Notes
APX2500
R19.00.00 or later
Requires option GA00631
APX4500
R19.00.00 or later
Requires option GA00631
APX6500
R19.00.00 or later
Requires option GA00631
APX7500
R19.00.00 or later
Requires option GA00631
APX8500
R19.00.00 or later
Requires option GA00631
NOTE:
Mobile Radio must be configured as Remote Mount in order to be compatible with the
DVRS.
When the DVR is interfaced to a compatible P25 capable Motorola Mobile Radio, the
complete equipment package is referred to as Digital Vehicular Repeater System
(DVRS).
The DVR may also be used as a standalone (Tactical) repeater. The operation of the
Tactical DVR is described in publication 8A083X21.
For details on the APX Interfaced DVRS Installation and Programming Guidelines,
please refer to publication 8M083X025.
For details on the Motorola APX series mobile radios, please refer to the applicable
User’s Manuals available from Motorola.
Manual Revisions
Rev
#
Date
By
Notes & References
0
July 2, 2013
KG
Original Release
1
December 8, 2014
KG
Firmware R1.10 Update
2
July 22, 2015
KG
Firmware R1.20 / SR7.15.5 Update
3
September 3, 2015
KG
Removed APX2500/APX4500
4
October 14, 2015
KG
Firmware R1.21 / R14.04.00 Update
5
February 10, 2016
KG
Firmware R1.22 / R14.50.00 Group Services
6
October 11,2016
AJK/SN
Firmware R1.30/SR7.17 Update
7
February 28,2017
AJK/SN
Removed APX2500/APX4500
8
April 17, 2017
AJK/SN
Firmware R1.40/ SR 7.17.5 Update
9
January 15,2018
AJK/SN
Firmware R1.41/SR 7.18 Update
FCC/ISED Update
10
June 11, 2018
AJK/SN
Firmware R1.42/SR 7.18.5 Update
11
January 28, 2019
AJK/SN
Firmware R1.43/SR 7.18.8 Update

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 9 of 94
Firmware
The DVRS Operation described in this Document requires the following Firmware:
APX Mobile Radios - firmware release: Host R19.00.00 or later.
APX Mobile Radios operating as the host mobile for the DVR require subscriber option
GA00631 for operation.
XTS1500 / XTS2500 / XTS5000 - firmware release R17.01.01or later.
APX2000 / APX4000 / APX6000 / APX7000 / APX8000 –firmware release R19.00.00 or
later.
APX Portable Radios operating through a DVR, utilizing the enhanced DVR digital
feature set require subscriber option QA00631.
DVR must be loaded with firmware release:
Application 4C083X11 R1.43 or later.
Tweaker Programming software 6A083X05 –Version 1.18 or later.
Computer Software Copyrights
The products described in this manual include copyrighted Futurecom computer
programs stored in semiconductor memories or other media. Laws in the United States,
Canada and other countries preserve for Futurecom certain exclusive rights for
copyrighted computer programs, including but not limited to, the exclusive right to copy
or reproduce in any form the copyrighted computer programs. Any copyrighted computer
program contained in the Futurecom products described in this manual may not be
copied, reproduced, modified, reverse-engineered, or distributed in any manner without
the express written permission of Futurecom. The purchase of Futurecom products shall
not be deemed to grant either directly or by implication, estoppels, or otherwise, any
license under the copyrights, patents or patent applications of Futurecom, except for the
normal non-exclusive license to use that arises by operation of law in the sale of a
product.
Document Copyrights
No part of this manual may be reproduced, distributed or transmitted in any form or by
any means, for any purpose without written permission of Futurecom.
Disclaimer
The information in this document is carefully examined and is believed to be entirely
reliable. However, no responsibility is assumed for inaccuracies.
Futurecom Systems Group, ULC. reserves the right to make changes to any products
herein to improve reliability, function or design. Futurecom does not assume any liability
arising out of the application or use of any product or circuit described herein.
Trademarks
MOTOROLA, ASTRO, XTLTM2500, XTLTM5000, XTSTM1500, XTSTM2500, XTSTM5000,
APXTM4000, APXTM6000, APXTM7000, APXTM8000,APXTM2500,APXTM4500, APXTM6500,
APXTM7500, APXTM8500, MDC1200 are trademarks of Motorola Solutions Inc.

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 10 of 94
Commercial Warranty and Service
Futurecom Systems Group, ULC. warrants to the original purchaser all standard
products sold by Futurecom Systems Group, ULC. to be free of defects in material and
workmanship for one (1) year from the date of shipment from Futurecom Systems Group
ULC.
Futurecom’s warranty hereunder DOES NOT cover the following :
(i) Defects or damage resulting from use of the product in other than its normal
and customary manner.
(ii) Defects or damage from improper installation, testing, operation, or
maintenance.
(iii) Defects or damage due to alterations, modifications or adjustments carried
out by the Buyer without Futurecom’s explicit approval.
(iv) Defects or damage from misuse, accident, water or neglect.
(v) Freight costs to the repair depot.
(vi) Scratches or other cosmetic damage to the product surfaces that does not
affect the operation of the product.
(vii) Normal wear and tear.
The warranty set forth herein is conditioned upon proper storage, installation, use and
maintenance in accordance with applicable written recommendation of Futurecom. The
warranty furnished hereunder does not extend to damage to items purchased hereunder
resulting in whole or in part from the use of components, accessories, parts of supplies
not furnished by Futurecom Systems Group, ULC.
Futurecom’s sole obligation shall be to repair or replace, at Futurecom’s option, any
defective component or item and pay transportation expenses for such replacement at
no charge to Buyer who shall provide labor for the removal of the defective component
or item and installation of its replacement at no charge to Futurecom. Buyer shall bear
all risk of loss or damage to returned goods while in transit. In the event no defect or
breach of warranty is discovered by Futurecom upon receipt of any returned item, the
item will be returned to Buyer at Buyer’s expense and Buyer will reimburse Futurecom
for the transportation charges, labor and associated charges incurred in testing the
allegedly defective item.
Except as expressly provided herein, Futurecom makes no warranty of any kind,
expressed or implied, with respect to any goods, parts and service provided by
Futurecom including, but not limited to, the implied warranties or merchantability and
fitness for a particular purpose. The sole and exclusive remedy for breach of any
warranty is limited to the remedies provided in the paragraph above. Futurecom shall
not in any event be liable for any other damages arising out of or in connection with
furnishing of goods, parts or service hereunder, or the performance, use of, or inability to
use any goods, parts or service, or otherwise, whether based on contract, tort or any
other legal theory.
To exercise this warranty, please contact Futurecom’s Administration Department in
Concord, Ontario, Canada at 1-800 701 9180 to obtain a return material authorization
(RMA) and shipping instructions. No product will be accepted for return without an RMA.
The repair of a product by Futurecom pursuant to this warranty is warranted for the
balance of the original warranty period, or at least 90 days from date of shipment to
Buyer of the repaired product.

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 11 of 94
Notations Used in This Manual
The following notations are used throughout this document:
NOTE:
A clarifying statement that expands on the text that follows.
IMPORTANT!
An important statement that should be considered and / or implemented in order
to achieve adequate equipment operation.
ATTENTION!
An instruction that must be followed to insure compliance with the appropriate
standards or proper equipment operations.

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 12 of 94
Declaration of Conformity
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
FCC Label
including interference that may cause undesired
2) This device must accept any interference received,
1) This device may not cause harmful interference, and
Operation is subject to the following two conditions:
This device complies with Part 15 of the FCC Rules.
operation.
RF Exposure Label

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 13 of 94
RF Energy Exposure Compliance, Awareness and
Control Information and Operational Instructions
ATTENTION!
Changes or modifications not expressly approved by Futurecom Systems Group,
ULC. could void the User’s authority to operate the equipment. To satisfy
FCC/ISED RF exposure requirements for mobile transmitting devices, the
minimum separation distances specified in the RF Safety Booklet 8F083X03(FCC)
or 8F083X05(ISED) shipped with the DVRS should be maintained. To ensure
compliance, operations at closer than this distance is not allowed.
ATTENTION!
Futurecom requires the P25 DVRS operator to ensure FCC/ISED Requirements for
Radio Frequency Exposure are met. The minimum distance between all possible
personnel and the body of the DVRS equipped vehicle is specified in the “RF
Safety” book shipped with the DVR. Failure to observe the Maximum Permissible
Exposure (MPE) distance exclusion area around the antenna may expose persons
within this area to RF energy above the FCC exposure limit for bystanders
(general population). It is the responsibility of the repeater operator to ensure MPE
limits are observed at all times during repeater transmissions. The repeater
operator must ensure at all times that no person comes within MPE distance from
the vehicle body.
ATTENTION!
The Transportable (suitcase) DVRS ships without an APX Mobile radio. Once an
APX Mobile radio is installed, refer to the Product Safety and RF Exposure booklet
8F083X03(FCC) or 8F083X05(ISED) enclosed with your DVRS. Refer to the vehicle
installation guidelines for vehicle installation. For fixed site installation, refer to
the Fixed DVRS Site Antennas section.

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 14 of 94
Introduction
The P25 DVR allows Portable Subscriber Units (PSU) to be used in areas where only
MSU coverage is available and PSU coverage is either intermittent or nonexistent.
Installed in the trunk of a car, fire truck, armored vehicle, ambulance or configured as a
Transportable or Fixed mount DVR, the P25 DVRS extends radio communications when
the PSU users are outside of the vehicle, inside a nearby building or in any portable
radio marginal coverage areas. The P25 Digital Vehicular Repeater (DVR) is designed to
be seamlessly interfaced to a compatible remote mount APX series Digital Mobile
Subscriber Unit (MSU) with or without Control Head (CH).
The DVR may also be used as a standalone (Tactical) repeater. The operation of the
Tactical DVR is described in publication 8A083X21.
The DVR extends voice (clear or encrypted) communications as well as key trunking
system features. It can be configured to provide various advanced options to the PSU
users.
The following table summarizes the DVRS compatibility scenarios:
FIXED NETWORK TYPE / MOBILE RADIO MODE
Portable
Radio Type /
Mode
Conventional
Analog MSU
Conventional
P25
MSU
3600 Analog
/ Digital
Trunking
MSU
P25 Trunking
Phase I
(FDMA)
MSU
P25 Trunking
Phase II
(TDMA)
MSU
Conventional
Analog PSU
YES
A/M
YES
A/M
YES
A/M
YES
A/M
YES
A/M
Generic
Conventional
P25 PSU
NO
YES
D/M/FA
NO
YES
D/M/FA
NO
DVRS Enabled
Conventional
P25 PSU
YES
FA/FA-All
YES
D/FA/M/ FA-
All
YES
FA/ FA-All
YES
D/FA/M/ FA-
All
YES*
D/FA/M/ FA-
All
Table 1 DVRS vs Infrastructure Compatibility
*DVRS Channel Types:
A = Analog
D = Digital
M = Mixed
FA = Forced Analog
FA-All= Forced Analog All
*Applies only to APX Portables

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 15 of 94
Identifying Your DVRS Model
Frequency Band of Operation
Depending on the frequency band of operation of the APX Series Mobile Subscriber Unit
(MSU) and DVR, the DVRS models are classified as follows:
•In-Band –when the MSU and DVR operate in the same frequency band.
•Cross-Band –when the MSU and DVR operate in two different frequency
bands.
Cross-Band
Cross-Band DVRS models do not include any filters on the MSU side since the MSU
and DVR are not intended to simultaneously operate in the same frequency band. In
single band MSU configurations the MSU and DVR operate in different frequency bands.
In dual band MSU configuration either the MSU & DVR operate in 3 different frequency
bands or one of the MSU frequency bands is locked out when DVR operation is enabled
as shown on Figure 1.
Figure 1 Cross-Band Full Duplex & Simplex Capable DVRS - Conceptual Diagram
The Cross-Band DVRS typically includes a duplexer which can accommodate full duplex
and simplex DVR operation as shown on Figure 1. The cross-band duplexer however
has a limited pass-band window and is tuned to the DVR frequencies provided on the
purchase order.
APX8500 may require interface kit. Please refer to the DVR/VRX1000 Ordering Guide.
As an option, a cross-band DVRS can be configured for simplex only operation as
shown on Figure 2. In this case the DVRS does not utilize any filters.

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 16 of 94
Figure 2 Cross-Band Simplex Only Capable DVRS - Conceptual Diagram
APX8500 may require interface kit. Please refer to the DVR/VRX1000 Ordering Guide.
NOTE:
The vehicular (side-by-side) mount Cross-Band DVR can be interfaced to a High Power
MSU, however, the Transmit power of the MSU must be reduced to comply with the
maximum power restrictions described in the RF Safety Booklet 8F083X03, which is
provided with the DVR.
IMPORTANT!
The DVRS is shipped equipped with custom filters tuned to the specified
frequency range provided by the Customer. Programming the DVR / MSU to
operate on frequencies outside of the original specified bands may result in
intermittent or complete loss of communications. Frequency changes may require
filter retuning or replacement.

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 17 of 94
Figure 4 Vehicular Mount Cross Band DVRS Model - Simplex Only Capable
Figure 3 Vehicular Mount Cross Band DVRS Model –Full Duplex & Simplex Capable

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 18 of 94
In-Band
The in-band DVRS models are equipped with two sets of filters, which are required in
order to ensure interference-free operation when both the MSU and DVR are
transmitting and receiving simultaneously in the same frequency band. The DVR is a full
duplex capable repeater, equipped with a duplexer, which provides sufficient isolation to
prevent desense during DVR repeat activation. The DVR duplexer also provides 40 dB
isolation on the Mobile radio transmit / receive frequencies. The filters installed at the
output of the MSU are designed to provide 40 dB isolation on the DVR transmit and
receive frequencies.
IMPORTANT!
The above filtering isolation must be complemented by 30dB minimum antenna
isolation (between the DVR and Mobile Radio antennas) in order to ensure
interference-free operation. It is recommended that the Mobile antenna is mounted
on the roof of the vehicle while the DVR antenna is mounted on the trunk.
Each DVRS is equipped with custom filters tuned to the specified frequency
bands –note the frequency range specified on the filter Labels.
Programming the DVR / Mobile radio to operate on frequencies outside of the
original specified bands may result in intermittent or complete loss of
communications. Frequency changes may require filter retuning or replacement.
The in-band DVRS models are also equipped with an RF bypass switch, which
bypasses the filtering at the output of the MSU when a “DVR –Disabled” TG is selected
on the MSU control head (see Figure 5).
When a “DVR – Enabled” TG is selected on the MSU CH, the RF switch automatically
connects the extra filters between the MSU antenna port and the MSU antenna to
ensure interference-free operation.
The complex in-band filtering is only feasible if sufficient frequency gap is present
between the DVR frequencies and the MSU frequencies associated with the “DVR -
Enabled” TGs.
For more information on the feasible filtering options, please refer to the DVRS Ordering
Guides.
As an option, an in-band DVRS can also be configured as simplex only (Figure 6). The
simplex in-band configuration however still requires DVR and in-band filters.
NOTE:
The DVR and MSU always require two (or three in the case of dual band MSU) separate
antennas.
NOTE:
The In-Band filters connected to the MSU have typical insertion loss of 1.5dB.

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 19 of 94
Figure 5 In-Band Full Duplex / Simplex Capable DVRS - Conceptual Diagram
Figure 6 In-Band Simplex Only Capable DVRS - Conceptual Diagram

8A083X30 Rev.11
APX Series P25 Interface
DVRS User’s Guide
January 2019 Page 20 of 94
Figure 7 Vehicular Mount In-Band 700 or 800MHz DVRS Model - Full Duplex & Simplex
Capable
Figure 8 Vehicular Mount In-Band VHF or UHF DVRS Model - Full Duplex & Simplex
Capable