BlueTail Technologies P25RX Manuel utilisateur

P25RX User Manual

Stand-alone, Digital Police And Fire Receiver

With Control-Channel And Bluetooth-Audio Support

The P25RX allows you to listen to unencrypted law-enforcement, fire department, and other

agency’s digital communications pu licly availa le in your area. The P25RX is not an old-

school scanner. The P25RX can receive the control-channel of trunked P25 Phase-1

systems. A single control channel frequency can ena le monitoring of all the agencies or talk

groups that utilize that control channel. Some shared systems cover multiple cities and

counties. Configuration can e as simple as entering a single frequency for a control channel

in your area. Because the information is digital, you can also easily program the device with

agencies or talk groups you want to listen to. If you don’t want to spend time configuring talk

groups, you can ena le the configuration option for “allow unknown talk groups”. In this case,

the BTConfig software will auto-collect and store all talk group information with the tag-field

set to ‘unknown’ for later editing. In the auto-collect mode, encrypted talk groups are

automatically stored and disa led for talk group tag-fields that have the default ‘unknown’

description. The P25RX learns a out alternate and adjacent control channels over-the-air

automatically and can e configured to roam to these alternate channels on loss of signal.

The integrated national frequency data ase makes programming primary and alternate

roaming control channel frequencies quick and easy. Unlike many receivers, the P25RX is

designed for excellent performance when receiving data from RF linear simulcast systems

(LSM).

BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual,   So tware Release 2020-04-26
Doc Date: 12/18/2020
Table of Contents
0  INTRODUCTION..................................................................................................................2
1  FEATURES................................................................................................................................2
2  OPERATING FREQUENCY RANGES...............................................................................................2
3  CONNECTOR AND INDICATOR  OCATIONS AND FUNCTIONS.............................................................3
4  FO OW TA K-GROUP / B UETOOTH PAIRING BUTTON.................................................................5
4.1  Single Click - Follow/Unfollow Talkgroup................................................................5
4.2  Double Click – Enable The Bluetooth Pairing Mode...............................................5
4.3  Triple Click – Disable / Enable Status  eds............................................................5
4.4  Quad Click – Start Bluetooth Firmware Bootloader Update..................................6
0  CONFIGURATION SOFTWARE........................................................................................6
1  OPERATING SYSTEM REQUIREMENTS..........................................................................................6
2  SOFTWARE INSTA ATION...........................................................................................................6
3  BACKUP FI ES / MP3 FI ES.....................................................................................................6
4  P25RX CONFIGURATION SETTINGS...........................................................................................8
5  FREQUENCY PROGRAMMING.....................................................................................................11
6  TA K GROUP EDITING.............................................................................................................14
7  TA K GROUP  OGGING...........................................................................................................16
8  AUDIO CONFIGURATION FOR PC SPEAKER P AYBACK...............................................................17
9  MONITOR MODE.....................................................................................................................18
0  ANTENNA RE ATED INFORMATION............................................................................19
1  ADJUSTING TE ESCOPIC ANTENNA  ENGTH...............................................................................20
0  TROUB ESHOOTING AND OPTIMIZATION................................................................20
1  BTCONFIG SOFTWARE RUNNING ON  INUX IS NOT WORKING........................................................20
2  USB CONNECTION IS UNSTAB E / CONNECTOR FEE S OOSE.....................................................21
3  RECOVER FROM FAI ED FIRMWARE UPDATE..............................................................................21
4  THE BTCONFIGURATION SOFTWARE HANGS ON CONNECT........................................................21
0  FIRMWARE UPDATES......................................................................................................21
1  P25 FIRMWARE.....................................................................................................................21
2  B UETOOTH MODU E FIRMWARE UPDATE.................................................................................22
0  B UETOOTH COMPATIBI ITY.......................................................................................23
1  A2DP AUDIO DEVICE COMPATIBI ITY......................................................................................23
0  RECEIVER TECHNICA  SPECIFICATIONS..................................................................25
0  B UETOOTH TRANSCEIVER TECHNICA  SPECIFICATIONS.................................27
0  P25 TRUNKING AND CONVENTIONA  MESSAGES DECODED..............................28
0  CREDITS...........................................................................................................................29
0  DOCUMENT HISTORY...................................................................................................30
Page 1 Of 32
BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual, So tware Release 2020-04-26

Doc Date: 12/18/2020

1.0 Introduction

1.1 Features

Easy to configure.

Stand-alone reception of P25 Phase 1 trunked systems using a control channel.

Automatic roaming to alternate control channel towers on loss of signal.

Configuration software supported on Windows 7, Windows 10, and Linux.

Automatic talk group programming and disa ling of encrypted channels.

Multi-rate, multi- ank-FIR/poly-phase, PLL sym ol synchronizer and quadrature

decoder for excellent performance in simulcast systems.

Ultra-linear LNA with a very high OIP3 and low noise.

90dB dynamic range on I/Q ADC(s)

TCXO reference with initial cal. Slow AFC (auto-frequency-control / tracking)

Audio AGC (audio automatic gain control) for 3.5mm audio line-out, Bluetooth

audio, and PC configuration software play ack.

3.5mm jack with line-out audio

Bluetooth Audio Streaming. Works with Bluetooth ena led speakers, ear uds,

headphones, hearing aids, car audio systems, etc.

Aluminum enclosure

Porta le / Rugged / Compact form factor

RF Shielding

ESD Protection

USB Type-C connector

BTConfig software allows the recording of received audio to mp3 files. Unique

files are created every 24 hours including meta data files with indexing

information for the mp3 files.

1.2 Operating Frequency Ranges

130 to 245 continous coverage P25 VHF

256 to 327 continous coverage P25 VHF/UHF

380 to 490 continous coverage P25 UHF

763 to 824 continous coverage P25 UHF

849 to 869 continous coverage P25 UHF

894 to 960 continous coverage P25 UHF

Page 2 Of 32

BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual, So tware Release 2020-04-26

Doc Date: 12/18/2020

1.3 Connector and Indicator Locations And Functions

• 3.5mm audio line-out - Line-level audio output. This will drive inputs to

powered speaker systems or line-inputs on PC sound cards. This output

provides high quality audio. If you are only using the 3.5mm jack, you

may want to disa le the Bluetooth audio interface from starting on power-

up. This configuration option can e changed using the BTConfig

configuration software.

• USB Type-C / Configuration interface - The Type-C USB connector can

e plugged in without paying attention to connector orientation. The USB

connection provides power to the radio and also provides a

communication interface to a PC running the BTConfig software. Once

the device is configured properly, only power is required to receive P25

communications. This means you can use attery packs or other types of

power sources to have a completely mo ile receiver solution.

• Power indicator - This green led is always lit when USB power is applied

to the device.

Page 3 Of 32

BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual, So tware Release 2020-04-26

Doc Date: 12/18/2020

• Signal quality Indicator - The signal quality indicator led is key to finding

the est orientation, position, and length for the included telescopic

antenna. Three colors are used to indicate signal quality (not signal

strength). The indicators are as follows:

Solid green This indicates the est quality reception. When receiving from

the control channel and the num er of TSBK (trunking system locks) /

second is > 20 or when receiving voice and no su -frames are dropped in

a super-frame (9/9).

Solid Blue This indicates accepta le reception. When receiving from the

control channel and the num er of TSBK / sec is > 10 or when receiving

voice, only a single su -frame was dropped from the super-frame (8/9). An

occasional lue indicator on a voice channel may result in some

noticea le loss in voice quality.

Solid Red Indicates that oth voice and control channels are less than

optimal quality. It indicates that voice quality may e unaccepta le. Note

that control channel reception may still e accepta le if the num er of

TSBK/sec is > 5. When the TSBK/sec starts approaching 0, some

conversations may e started late or missed. If TSBK/sec is 0, then the

signal indicator will e off and no conversations will e heard. The signal

indicator is also turned off riefly when automatically switching etween

the control channel and voice channels.

Blinking Green or Blue - The signal indicator will flash during voice

reception when there is a pause in the communications (one side waiting

for response from the other side).

Blinking Fast Red/Blue - This indicates that the Bluetooth pairing mode

has een initiated and the device is currently in discovery mode looking for

a Bluetooth speaker device to pair with.

Blinking Slow Red/Blue - This indicates that the Bluetooth firmware

update mode has een initiated and the device is currently in ootloader

mode waiting for new firmware to e uploaded. The Bluetooth firmware

can only e updated with special software. Please see the Bluetooth

firmware update section for more information. Press the TG utton with a

single-press to exit this mode.

Page 4 Of 32

BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual, So tware Release 2020-04-26

Doc Date: 12/18/2020

• Talk-group active indicator - In the normal mode of operation, this yellow

led indicator is active when the device is currently receiving valid digital

voice information from an active talk-group. When the follow-talk group

mode is active, this indicator will flash on/off until the talk group is un-

followed again. The P25RX will not roam when the the follow talk group

mode is active.

• Internal Bluetooth antenna – It is important to note that the antenna for

Bluetooth is contained within the metal enclosure of the P25RX. The EM

waves will propagate out from oth ends of the enclosure more efficiently

than the sides. To get the maximum range to your Bluetooth speaker

device, it is important to orient the P25RX enclosure such that the end

panels (connectors) point toward the remote Bluetooth speaker. If the

remote device is in very close proximity (<= 1 meter), then the orientation

is not all that critical.

1.4 Follow Talk-group / Bluetooth Pairing Button

1.4.1 Single Click - Follow/Unfollow Talkgroup.

The yellow TG indicator led will flash slowly on/off during the follow mode.

This option is useful if you want to follow the last received talk group

(excluding all other talk groups) for a period of time. Press the TG utton

again with a single click to return to following all ena led talkgroups. The

P25RX does not shuffle talk groups when the the follow talk group mode is

active.

1.4.2 Dou le Click – Ena le The Bluetooth Pairing Mode.

During the pairing process, the signal led will quickly flash alternate

lue/red colors until the pairing is completed or until the pairing timeout

has expired (30 seconds). In Bluetooth pairing mode, the P25RX will

attempt to discover a near y speaker/audio device to pair with. The

P25RX stores up to 8 paired devices in a circular fashion. If Bluetooth is

ena led on power-up, then the P25RX will continually try to connect to all

known paired devices until a connection is successful. If the Bluetooth

connection is lost, the P25RX will resume trying to connect to all

previously paired devices (all devices within the previous 8 successful

pairings). If Bluetooth is disa led in the configuration, initiating the

Bluetooth pairing mode will ena le the Bluetooth device (until the next

power cycle) and attempt to pair with known devices.

1.4.3 Triple Click – Disa le / Ena le Status Leds.

This option toggles etween ena ling/disa ling the SIG and TG status

indicator leds. This can e useful in dark settings where the status leds

are too right or distracting. Keep in mind: When the status leds are

disa led, other mode indications such as “follow talk group (flashing

yellow)”, “Bluetooth pairing (flashing red/ lue)”, etc are also disa led.

Page 5 Of 32

BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual, So tware Release 2020-04-26

Doc Date: 12/18/2020

1.4.4 Quad Click – Start Bluetooth Firmware Bootloader Update

In this mode, the signal led flashes slowly etween lue/red. A single click

exits this mode. Please see section 5.2 for more information on updating

the Bluetooth firmware.

• Female SMA Antenna Connector

2.0 Con iguration So tware

2.1 Operating System Requirements

The BTConfig configuration software is a Java- ased application that requires

Java version 1.8 JRE to e installed, and an OS capa le of USB CDC-serial-

communications. The software may run on Windows, Linux, OSX, Solaris, and

Android systems meeting this requirement. Only Windows 7, 10, and Linux

systems have een tested and verified to work correctly as of 3/02/2020. No

other drivers or dependencies are needed for Windows 7, 10, and Linux systems.

Java versions known to work:

OpenJDK version 1.8.0_222

OpenJDK version 1.8.0_242

OpenJDK version 11

Oracle JDK 11, Oracle JDK 13, Oracle JDK 14

Java versions known to have issues:

Oracle version 1.8.0_060 is known to have issues. Don’t use it.

2.2 Software Installation

The software is distri uted as a single file, MS-Windows executa le. Windows

users can copy the BTConfig.exe file to the desktop and dou le-click to start the

application. If a Java run-time is not installed, Windows users will e taken to the

Java runtime download URL in a we rowser.

The configuration software can also e started on Linux (and presuma ly other

Java implementations) with the -jar syntax:

e.g. : ‘java -jar BTConfig.exe’

2.3 Backup Files / MP3 Files

The files are stored under the user home directory in a directory / folder named

Page 6 Of 32

BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual, So tware Release 2020-04-26

Doc Date: 12/18/2020

p25rx. For Windows this should e located in the “Documents/p25rx” directory.

On Linux, “/home/username/p25rx/”. If you don’t want the mp3 files to e

created, you can turn this functionality off in the “PC Audio Ta ”.

Page 7 Of 32

BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual, So tware Release 2020-04-26

Doc Date: 12/18/2020

2.4 P25RX Configuration Settings

• Control Channel Frequency (Primary)

The control channel frequency determines the frequency the P25RX uses

for a control channel when it first powers up. It will continue to use this

frequency for control except when roaming is ena led and the signal is not

availa le. Please also see the <Search DB For Near y Control

Channels> section for for more information on how to use the integrated

frequency data ase to program this frequency value.

• Line-out Volume

This value controls the audio level on the 3.5mm line-out audio jack. For

driving connections to most powered speaker devices and sound-card

audio line-in jacks, the default value of 0.8 is a good setting.

• Ena le Bluetooth On Power-Up

When ena led, Bluetooth will e started shortly after power-up and the

device will attempt to pair with any near y devices that it has een

previously paired with. See Bluetooth Pairing for more information.

Page 8 Of 32

BlueTail Technologies P25RX User Manual

BlueTail Technologies User Manual, So tware Release 2020-04-26

Doc Date: 12/18/2020

• Bluetooth Volume

This value controls the digital gain for audio that is sent wireless over a

Bluetooth audio stream. The default setting of 0.8 is a good value for most

devices. To preserve dynamic range, set this value as high as possi le

without causing clipping of audio on the remote Bluetooth speaker device.

• Allow Unknown Talk Groups

When this option is selected the P25RX device will attempt to listen to any

active talk groups as reported y the control channel. The system-id, talk-

group-id in the <talk group editor> will automatically e populated with the

talk group set to ‘ena led’. The AlphaTag field will e set to ‘tgid_uknown’

(this can e edited at any time). If the auto-flash option is ena led, then

the newly updated talk group ta le will e automatically written to the talk

group flash area of the P25RX device. If encrypted communications are

detected on a talk group and the AlphaTag field has the default ‘unknown’

value and the auto-disa le-encrypted option is ena led, then the

encrypted talk group will automatically e disa led and the newly updated

ta le will e written to the talk group flash area of the P25RX device.

Please see the Talk Group Editing section for more information.

• Ena le Status LEDS

When selected, the status leds will e ena led on power-up. See the

Follow Talk-group / Bluetooth Pairing Button section for more information

on how to ena le/disa le the status leds with the TG utton while the

device is operating without eing connected to a PC.

• Ena le Roaming

When this option is ena led, the P25RX will attempt to locate a new

control channel when it is una le to achieve greater than 5-TSBK/SEC

from the control channel within a period of 10 seconds. The potential

alternate control channels must e frequencies that have een “learned”

from the current control channel or have een programmed into the

roaming-flash-area. Please see the section on “Add Selected Frequencies

To Roaming Flash” for more information on how to add the alternate

control channels to the roaming flash area. Note that this option can e

helpful if you are planning on visiting a different location and you will not

have access to the configuration software. Programming potential control

channels for a distant location can ena le seamless transition from

monitoring one area to the next without having to re-configure the device.

The P25RX will not roam when the the follow talk group mode is active.

Page 9 Of 32

BlueTail Technologies P25RX User Manual

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