Futurecom VRX1000 User manual

VRX1000
P25 VEHICLE RADIO EXTENDER
User’s Guide
8A087X02 R3 February 2016

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NOTES

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Contents
Contents ........................................................................................................................3
Foreword........................................................................................................................8
Manual Revisions........................................................................................................8
Firmware.....................................................................................................................9
Computer Software Copyrights....................................................................................9
Document Copyrights..................................................................................................9
Disclaimer ...................................................................................................................9
Trademarks...............................................................................................................10
Commercial Warranty and Service ............................................................................11
Notations Used in This Manual ..................................................................................12
Declaration of Conformity ..........................................................................................13
RF Energy Exposure Compliance, Awareness and Control Information and
Operational Instructions.............................................................................................14
RF Exposure Label....................................................................................................15
FCC Label.................................................................................................................15
Installation Requirements for Compliance with Radio Frequency (RF) Energy
Exposure Safety Standards........................................................................................16
Introduction.................................................................................................................17
Identifying Your VRX1000 Model...............................................................................18
Frequency Band of Operation............................................................................................... 18
Cross-Band........................................................................................................................... 18
In-Band.................................................................................................................................. 19
Band Locking ........................................................................................................................ 20
VRX1000 Operation Basics.........................................................................................21
PSU Features Supported by VRX1000 on Motorola Infrastructure ............................22
‘VRX1000 Enabled’ PSU Features Supported on Non-Motorola Infrastructure..........23
Powering up the VRX1000 ........................................................................................24
Turning ON the VRX1000..........................................................................................24
Activating the VRX1000 via the Control Head...................................................................... 24
Automatic VRX1000 Activation (AVRA)................................................................................ 25
Remote Activation of the VRX1000 ...................................................................................... 26
Turning OFF the VRX1000........................................................................................28
Deactivating the VRX1000 via the MSU Control Head......................................................... 28

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Deactivating the VRX1000 via Call Alert sent by Dispatch................................................... 28
Automatic VRX1000 Deactivation......................................................................................... 29
VRX1000 Status Display...........................................................................................30
‘DVRS/VRX1000 Enabled’ PSUs ..............................................................................31
VRX1000 Status Tones.............................................................................................32
VRX1000 Status Tones - MSU Speaker............................................................................... 32
VRX1000 Status Tones - PSU.............................................................................................. 33
‘DVRS/VRX1000 Enabled’ Mobile Radio TGs / Channels .........................................35
‘DVRS/VRX1000 Disabled’ Mobile Radio TGs / Channels.........................................35
In Car Monitor (ICM)..................................................................................................36
Primary / Secondary Operation Basics......................................................................37
Permanent Primary Activation .............................................................................................. 39
Permanent Primary Deactivation.......................................................................................... 39
Legacy Mobexcom II Voting Compatibility Mode.................................................................. 39
VRX1000 Voting Compatibility Modes.................................................................................. 39
VRX1000 Modes of Operation...................................................................................40
OFF Mode............................................................................................................................. 40
SYSTEM Mode ..................................................................................................................... 40
LOCAL Mode ........................................................................................................................ 41
Selecting VRX1000 Mode .........................................................................................42
Selecting VRX1000 Mode from the Control Head................................................................ 42
Strapped VRX1000 Mode..................................................................................................... 42
Selecting VRX1000 Channel.....................................................................................42
Independent VRX1000 Channel Change ............................................................................. 42
Strapped VRX1000 Channel Change................................................................................... 42
MSU Scan.................................................................................................................44
Supported MSU Scan Types ................................................................................................ 44
VRX1000 Enabled / Disabled Rules while MSU Scan is enabled........................................ 44
Outbound Calls (received by MSU from the FNE) with MSU Scan Enabled........................ 44
Inbound Calls (received by VRX1000 from PSU) with MSU Scan Enabled......................... 44
Unsupported PSU Features.......................................................................................45
P25 Digital Mode Operation........................................................................................46
PSU Affiliation ...........................................................................................................47
Group Calls...............................................................................................................47
MSU Priorities ...........................................................................................................47
PSU Proxy Request Priorities....................................................................................47
Signaling Request Interactions with Voice and Signaling Proxy.................................48
Voice Request Interaction with Signaling and Voice Proxy........................................49
MSU Voice and Signaling Proxy Interactions.............................................................50
Talk Group Proxing ...................................................................................................50
Talk Group Translation..............................................................................................50

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Private Calls..............................................................................................................51
PSU Talk Permit Tones.............................................................................................51
Status Broadcast.......................................................................................................52
Local Mode Indication................................................................................................52
Radio Check / Inhibit .................................................................................................52
P25 Trunking OTAR..................................................................................................52
Patch.........................................................................................................................53
Dynamic Regrouping.................................................................................................54
Phone Interconnect...................................................................................................54
Adaptive Power Control.............................................................................................54
Digital Audio Buffering...............................................................................................54
P25 Encryption..........................................................................................................55
Remote VRX1000 Activation and Steering by PSU Call Alert (Page) ........................56
Emergency in Digital Mode........................................................................................58
Emergency Alarm ................................................................................................................. 58
Emergency Call..................................................................................................................... 59
Emergency Revert through VRX1000 .................................................................................. 59
Emergency Revert through PSU .......................................................................................... 59
Emergency operation during TG Translation........................................................................ 59
Fireground (FG) Signaling.........................................................................................60
PSU IV&D .................................................................................................................60
PSU Location Reporting GPS....................................................................................60
PSU Call Alert ...........................................................................................................60
PSU Message ...........................................................................................................60
PSU Status Update and Status Request ...................................................................60
Automatic PSU Revert to Talk Around (TA)...............................................................61
PSU Group Services .................................................................................................61
Group Text............................................................................................................................ 61
Group Alias Update............................................................................................................... 62
Digital Mode –P25 Conventional Support.................................................................63
P25 Digital VRX1000 Mode with P25 Conventional Mode Selected on MSU...................... 63
P25 Digital VRX1000 Mode (Generic P25 PSUs) with P25 Trunked (FDMA) Mode Selected
on MSU................................................................................................................................. 64
Digital Mode –P25 Enhanced Trunking Features Support........................................65
P25 Digital VRX1000 Mode with P25 Conventional Mode Selected on MSU...................... 65
P25 Digital VRX1000 Mode with P25 Trunked (FDMA) Mode Selected on MSU................ 66
Forced Analog Mode...................................................................................................67
Forced Analog Mode –Summary of Features...........................................................68
Forced Analog VRX1000 Mode with P25 Trunking TDMA Mode Selected on MSU............ 68

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Forced Analog VRX1000 Mode with 3600 Trunking Mode Selected on MSU ..................... 69
Forced Analog VRX1000 Mode with Conventional Analog Mode Selected on MSU........... 70
Analog Mode Operation..............................................................................................71
VRX1000 Channel Setup for Analog Mode................................................................71
Group Calls...............................................................................................................71
Emergency in Analog Mode.......................................................................................72
Emergency Alarm ................................................................................................................. 72
Emergency Call..................................................................................................................... 72
Emergency Revert ................................................................................................................ 73
Analog Audio Buffering..............................................................................................73
Tactical Public Safety (TPS)......................................................................................73
Fireground (FG) Signaling.........................................................................................73
Remote VRX1000 Activation via DTMF.....................................................................74
P25 Encryption in Analog Mode ................................................................................74
Leading & Trailing Tones...........................................................................................74
Mobile Mode Steering via PL/DPL.............................................................................75
Steering and Emergency ...................................................................................................... 75
MSU Operating on TDMA (P25, Phase 2).................................................................75
Analog Mode –Summary of Features.......................................................................76
Analog VRX1000 Mode with P25 Trunking Mode (FDMA) Selected on MSU ..................... 76
Analog VRX1000 Mode with P25 Conventional Mode Selected on MSU............................ 77
Analog VRX1000 Mode with Conventional Analog Mode Selected on MSU....................... 78
Analog VRX1000 Mode with 3600 Baud Analog or Digital Trunking Mode Selected on MSU
.............................................................................................................................................. 79
Analog VRX1000 Mode with P25 Phase II (TDMA) Trunking Mode Selected on MSU....... 80
Mixed VRX1000 Mode .................................................................................................81
Special Features Support...........................................................................................82
TPS Signaling ...........................................................................................................82
Troubleshooting..........................................................................................................83
Appendix 1 –VRX1000 Specifications - Preliminary ................................................84
Contact Information....................................................................................................86
Glossary.......................................................................................................................87
Index ............................................................................................................................90

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List of Tables
Table 1 Minimum Lateral Distance from Antenna –VRX1000.......................................15
Table 2 VRX1000 vs Infrastructure Compatibility ..........................................................17
Table 3 VRX1000 Features vs Type of PSU .................................................................22
Table 4 VRX1000 Enabled PSU Features Support on Non-Motorola Infrastructure ......23
Table 5 AVRA Functionality...........................................................................................25
Table 6 VRX1000 Status Display Messages / Icons......................................................30
Table 7 DVRS/VRX1000 Enabled PSU Models.............................................................31
Table 8 VRX1000 Status Tones (MSU Speaker)...........................................................32
Table 9 P25 DVRS/VRS1000 Enabled PSUs –DVRS/VRX1000 Specific Tones..........33
Table 10 Analog PSU - VRX1000 Specific Tones .........................................................34
Table 11 Primary VRX1000 Definitions .........................................................................38
Table 12 VRX1000 Voting Compatibility........................................................................39
Table 13 OFF Mode Operation......................................................................................40
Table 14 SYSTEM Mode Operation..............................................................................40
Table 15 LOCAL Mode Operation.................................................................................41
Table 16 MSU Proxy Request Priorities ........................................................................47
Table 17 PSU Proxy Request Priorities.........................................................................47
Table 18 Signaling Request Interaction with Signaling Proxy........................................48
Table 19 Signaling Request Interaction with Voice Proxy..............................................48
Table 20 Voice Request Interactions with Signaling Proxy............................................49
Table 21 Voice Proxy Interaction with Voice Proxy........................................................49
Table 22 Inbound P25 Encryption Rules .......................................................................55
Table 23 Outbound P25 Encryption Rules.....................................................................55
Table 24 MSU MIC PTT P25 Encryption Rules.............................................................55
Table 25 Typical Remote Steering Scenarios................................................................57
List of Figures
Figure 1 Cross-Band VRX1000 - Conceptual Diagram..................................................18
Figure 2 In-Band VRX1000 - Conceptual Diagram........................................................19

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Foreword
The Vehicular Radio Extender (VRX1000) is designed to be seamlessly interfaced to the
following Motorola Solutions Mobile Radios:
Mobile Radio Model
Firmware Requirements
Notes
APX2500
R14.50.00 or later
Requires option GA00631
APX4500
APX5500
APX6500
APX7500
NOTE:
Mobile Radio must be configured as Remote Mount in order to be compatible with the
VRX1000.
This manual provides User guidelines for the Futurecom VRX1000 that is
interfaced to one of the above remote mount Mobile radios with a corresponding
compatible control head.
For details on the VRX1000 Installation and programming guidelines, please refer to the
VRX1000 Installation and Programming Guide 8M087X01.
For details on the Motorola Solutions Mobile Radio operation, please refer to the
applicable Manuals available from Motorola Solutions.
Manual Revisions
Rev #
Date
By
Notes & References
0
November 11, 2014
KG
Original Release
1
July 22, 2015
KG
Firmware R1.20/SR7.15.5 Update
2
October 15, 2015
KG
Firmware R1.21/Q4 2015 SER Update
3
February 12, 2016
KG
Firmware R1.22/Q1 2016 SER Update

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Firmware
The VRX1000 Operation described in this Document requires the following
Firmware:
APX2500/APX4500/APX6500/APX7500 - firmware release: Host R14.50.00 or later.
APX Mobile Radios operating as the host mobile for the VRX1000 require subscriber
option GA00631 for operation.
APX2000/APX4000/APX6000/APX7000/APX8000 –firmware release R14.50.00 or
later.
APX Portable Radios operating through a DVR/VRX1000, utilizing the DVR/VRX1000
Enabled digital feature set require subscriber option QA00631.
APX Control Head - firmware release R20.00.00 or later.
VRX1000 must be loaded with application firmware 4C083X11 R01.22 or later.
Tweaker Programming software version 1.06 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.

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Trademarks
MOTOROLA SOLUTIONS, ASTRO, XTLTM2500, XTLTM5000, XTSTM1500, XTSTM2500,
XTSTM5000, APXTM2000, APXTM4000, APXTM2500, APXTM4500, APXTM6000,
APXTM7000, APXTM8000, APXTM6500, APXTM7500, MDC1200 are trademarks of
Motorola Solutions Inc.

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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.

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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.

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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 LABELS:
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
(1) This device may not cause harmful interference.
and
(2) This device must accept any interference received, including
interference that may cause undesired operation.
FCC SECTION 15.105 INFORMATION TO THE USER:
NOTE: This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
-- Reorient or relocate the receiving antenna.
-- Increase the separation between the equipment and receiver.
-- Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
-- Consult the dealer or an experienced radio/TV technician for help.

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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/IC
RF exposure requirements for mobile transmitting devices, the minimum
separation distances specified in Table 1 should be maintained. To ensure
compliance, operations at closer than this distance is not allowed.
ATTENTION!
Futurecom requires the P25 VRX1000 operator to ensure FCC Requirements for
Radio Frequency Exposure are met. The minimum distance between all possible
personnel and the body of the VRX1000 equipped vehicle is specified in the “RF
Safety” booklet. 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.
USA Users:Do not use the VRX1000 in the frequency band 406.0 –406.1MHz. This
frequency band is reserved for distress beacons.
ATTENTION!
This radio is intended for use in occupational / controlled conditions, where users
have full knowledge of their exposure and can exercise control over their
exposure to meet FCC limits. This radio device is NOT authorized for general
population, consumer, or any other use.
It is the responsibility of the VRX1000 Operator to ensure that Maximum
Permissible Exposure (MPE) limits are observed at all times during repeater
transmissions. If this vehicular repeater is used in combination with a separate
mobile radio transmitter, the Repeater operator must ensure at all times that no
person comes within the MPE distance from the vehicle body to ensure
compliance with the FCC’s/IC’s RF energy exposure limits for the general
population.
The minimum lateral distance between all possible personnel and the body of the
VRX1000 equipped vehicle must be as specified in Table 1.
Failure to observe the 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).

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VRX1000 (3W)
Minimum Lateral Distance from Antenna
VHF
67.0cm (26.4 inches) (up to 100% Tx duty cycle)
UHF 380-512MHz
40.0cm (15.75 inches) (up to 100% Tx duty cycle)
700MHz
28.3cm (11.1 inches) (up to 100% Tx duty cycle)
800MHz
26.8cm (10.6 inches) (up to 100% Tx duty cycle)
Table 1 Minimum Lateral Distance from Antenna –VRX1000
50% Tx duty cycle is defined as Push To Talk (PTT), 50% Talk - 50% Listen.
100% Tx duty cycle is defined as Push To Talk (PTT), 100% Talk
IMPORTANT
The maximum allowed gain of the λ/4 Omni-directional antenna for the VRX1000 is Unity
(0dBd).
RF Exposure Label
The RF Exposure Label should be affixed in the vehicle beside the mobile radio
control head. The label should be in the direct view of the Repeater operator. The
label is supplied with the VRX1000.
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.

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Installation Requirements for Compliance with
Radio Frequency (RF) Energy Exposure Safety
Standards
ATTENTION!
To ensure compliance with RF Energy Safety Standards:
Install only Futurecom / Motorola Solutions approved antennas and accessories and
set conducted power into the VRX1000 antenna equal to or lower than the approved
power levels –refer to Table 1.

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Introduction
The VRX1000 is a simplex radio coverage extender, which is interfaced to a compatible
remote mount Motorola Solutions Mobile Radio and enables Portable Subscriber Units
(PSU) to be used in areas where only Mobile Subscriber Unit (MSU) coverage is
available and PSU coverage is either intermittent or completely absent.
Installed in the trunk of a car, fire truck, armored vehicle, ambulance, the VRX1000
extends radio communications to the PSU users who are outside of the vehicle, inside a
nearby building or in any marginal portable radio coverage areas. The VRX1000 extends
voice (analog, P25 clear or P25 encrypted) communications and supports key trunking
system features. The VRX1000 can be configured to provide various advanced options
to the users.
Table 2 provides information on the VRX1000 infrastructure compatibility options.
FIXED NETWORK TYPE / MOBILE RADIO MODE
Portable
Radio Type /
Mode
Conventional
Analog incl.
Mixed Receive
Conventional
P25 incl.
Mixed Receive
3600 Analog /
Digital
Trunking
9600 P25
Trunking
FDMA
9600 P25
Trunking
TDMA
Conventional
Analog
YES
A
YES
A/M
YES
A
YES
A/M
YES
A
Generic P25
Conventional
NO
YES
D/FA/M
NO
YES
D/M
NO
P25
Conventional
‘DVRS
Enabled’
YES
FA
YES
D/FA/M
YES
FA
YES
D/FA/M
YES
FA
Table 2 VRX1000 vs Infrastructure Compatibility
VRX Channel Types:
A = Analog, D = Digital, M = Mixed, FA = Forced Analog (see Part II of this manual)

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Identifying Your VRX1000 Model
Frequency Band of Operation
Depending on the frequency band of operation of the APX Mobile Subscriber Unit (MSU)
and VRX1000, the VRX1000 models are classified as follows:
In-Band –when the MSU and VRX1000 operate in the same frequency band.
Cross-Band –when the MSU and VRX1000 operate in two different frequency
bands.
Cross-Band
Cross-Band VRX1000 models do not include any filters on the MSU side since the MSU
and VRX1000 are not intended to simultaneously operate in the same frequency band.
In single band MSU configurations the MSU and VRX1000 operate in different frequency
bands.
In dual band MSU configuration either the MSU & VRX1000 operate in 3 different
frequency bands or one of the MSU frequency bands is locked out when VRX operation
is enabled as shown on Figure 1.
VRX1000
APX4500
APX6500
APX7500
MASP / XCMP
CONTROL HEAD
& ACCESSORIES
TX=RX=F1
CONVENTIONAL P25
OR
CONVENTIONAL ANALOG
Figure 1 Cross-Band VRX1000 - Conceptual Diagram

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In-Band
The in-band VRX1000 models are equipped with two sets of filters, which are required in
order to ensure interference-free operation when both the MSU and VRX1000 are
transmitting and receiving simultaneously in the same frequency band. The VRX1000
filter provides 40 dB isolation on the Mobile radio transmit / receive frequencies. The
filter installed at the output of the MSU is designed to provide 40 dB isolation on the
VRX1000 TX/RX Frequency Range.
IMPORTANT!
The above filter isolation must be complemented by 30dB minimum antenna
isolation (between the VRX1000 and Mobile Radio antennas) in order to ensure
interference-free operation. It is recommended that the MSU in-band antenna is
mounted on the roof top of the vehicle while the VRX antenna is mounted on the
trunk. Each VRX1000 is shipped equipped with custom filters tuned to the
specified frequency bands –note the frequency range specified on the filter
labels. Programming the VRX / MSU 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.
NOTE:
The VRX1000 and MSU require two or three (in the case of dual band MSU) separate
antennas.
IMPORTANT!
The In-Band filters connected to the APX MSU can handle up to 50 Watts MSU TX
power and have typical insertion loss of 1.5dB.
VRX1000
APX4500
APX6500
APX7500
MASP / XCMP
CONTROL HEAD
& ACCESSORIES
TX=RX=F1
CONVENTIONAL P25
OR
CONVENTIONAL ANALOG
IN-BAND
FILTER
(No RF
SW) IN-BAND
FILTER
Figure 2 In-Band VRX1000 - Conceptual Diagram

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Band Locking
Two in-band sets of filters –one placed at the MSU Antenna port and another placed at
the VRX1000 Antenna port, are required when both the MSU and VRX1000 are
configured to operate in the same frequency band. The frequency specific in-band filters
are required in order to prevent interference when the VRX1000 is receiving & MSU is
transmitting and vice versa.
When the in-band filter is not present, the Band Lock feature must be enabled (by using
the Tweaker programming software) in order to prevent VRX1000 operation on MSU
channels that are explicitly using the same frequency band as the VRX1000. On MSU
channels where the frequency band is not explicitly known such as in multi-site trunking
systems, the MSU will be prevented from using frequencies in the same band while the
VRX1000 is active (i.e. in SYSTEM or LOCAL mode). In this case the MSU will no
longer allow roaming to sites using the locked out band. If the MSU is currently on a
trunking site that uses the locked out band, the MSU will roam to another site. If no other
sites are available, the MSU will enter Out Of Range state. When the VRX1000 is
inactive (OFF mode), the MSU frequency band is unlocked.
In the case of a single band MSU (such as the APX4500 and APX6500), in-band
VRX1000 applications always require in-band filters and the Band Locking feature must
be disabled.
For MSU conventional channels where the band is known and fixed, the VRX1000
restricts access to channels using the locked out frequency band.
If Band locking is enabled in the VRX1000 and SCAN is enabled in the MSU, the MSU
will skip over any channels in the scan list that are configured to operate in the same
frequency band as the VRX1000.
IMPORTANT!
A 700MHz VRX1000 interfaced to APX MSU operating on 800MHz as well as an
800MHz VRX1000 interfaced to APX MSU operating on 700MHz are considered In-
Band applications and either In-Band filters must be provided or band locking
must be enabled (if the MSU is dual band and VRX operation can be supported on
the non 700/800MHz band).
The above is also valid for any of the UHF Bands –if the MSU operates on any of
the UHF ranges, an UHF VRX interfaced to it will require in-band filters to be
installed or band locking to be enabled.