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UHF Remote Diagnostic Bi-Directional Amplifier Datasheet URDM-100 USM

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The Becker UHF Bi-Directional Amplifier is typically used in Mining, Shipping, Tunneling, Motorway and In-Building radiating cable systems to compensate for Leaky Feeder Cable longitudinal losses in both directions simultaneously. Becker BDA specifications are optimally suited to maximize these performance criteria. The BDA serves to maintain the strength of RF signal levels along the Leaky Feeder coaxial cable. The amplifier is unique in that it offers the lowest possible noise contribution to an already weak RF carrier when operating in collocation with a strong carrier. The connectors of the inline amplifiers have been designed for ease of connection making installation and repair as convenient as possible. The Power Source required from the Leaky Feeder cable is 8V to 17Vdc. The most important performance criteria of a BDA are:

Channel capacity - Number of simultaneous voice and data

Channel quality (clear voice channels, data channel and integrity).

Channel isolation (Freedom from inter-modulation distortion).

Distance achievable away from the cable.

Reliability and Mean-Time-Between-Failure channels. Becker BDA specifications are optimally suited to maximize these performance criteria. The Pantha Serial Service (part of the CATS Central Asset Tracking System) makes requests to the Remote Diagnostic Head-end. The Head-end then relays this request to the Remote Diagnostic Bi-Directional Amplifier (via Leaky Feeder Cable) which replies via the Head-end to the Pantha Serial Service. An assortment of information can be requested by the Pantha Serial Service. It includes requests on the Bi-Directional Amplifier diagnostic information, voltage, current and receiving and transmitting frequencies. Status on the CLC (Cable Length Compensation) can be retrieved. The information that is sent to CATS (with the Head-end as proxy) is also displayed on the unit. This is shown on an OLED display and indicated on LED‟s on the face of the unit. Pantha saves this information into the CATS database, enabling users to view the data in tabular form, trend form or as a graphical display in a map system. Pantha can also set the unit‟s thresholds and set the screen mode which the unit should display in. The RD BDA also has an Infra-Red (IR) modem that, via infrared serial communication, can set the OLED screen mode on the unit.

The URDM-100 has the following safety description, also applicable to the Head-end and Tunnel connectors: Ui = 17V Ii = 1.08A Pi = 12.75W Li = 22 uH Ci = 116.6 nF

The BDA has two RF connections, which are the same IS circuit and can be powered from either connectors. The safety description of the power connected to the one side of the BDA are the output parameters of the other connector, except the terminal parameters Ci and Li of the BDA have also to be taken into account.

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Becker Electronics CNR Freda and CR Swart Drive Randburg Johannesburg South Africa 2169

Tel: +27 11 801-5900 Fax: +27 11 793-7900 Website: www.becker-mining.com Email: [email protected]

DISCLAIMER All information given in this datasheet is correct to the best of our knowledge, but the company reserves the right to make alterations and amendments to the detailed specification at its discretion.

DC Power – Voltage status indicators on front panel.

DC Power – Amplifier Current consumption indicators on front panel.

Downlink signal strength indicators – to ensure line spacing is correct.

Uplink AGC ON indication – to ensure up-link is working correctly.

Integrated Cable Length Compensation (CLC) to simulate additional cable lengths as necessary.

OLED screen to show voltage, current, baud rate and Rx/Tx Frequencies.

Remotely Connects to CATS for diagnostics and telemetry.

Shows status for CLC (Cable Length Compensation).

Communicates with Pantha Serial Communi-cations.

Raw and Calibrated information of voltage and current.

Different OLED screen modes.

Optimized noise performance in VHF Leaky Feeder systems.

Carefully distributed amplification using low voltage GaAs devices in both directions to optimize overall figure under dynamic (Small and Large Simultaneously) conditions.

Protection: Transorb Diodes that clamp transient energy at defined voltage levels.

Protection: Switchmode Voltage Regulator which reduces the applied voltage on the Leaky Feeder line down to the internally required 3 volts.

Protection: A polyswitch to protect the amplifier circuitry in the event of excess current drain.

Setup and adjustment via Pantha Serial Communications.

RF Power signal quality indicated on different OLED screen modes.

Thresholds of settings on OLED screen adjustable via Pantha Serial Communication.

Infrared modem to adjust screen modes.

Description Spec / Range / Type

Frequency range Voice/ Data Base to Handheld 475 MHz –480 MHz (Down-link) Handheld to Base 450 MHz – 455 MHz (Up-link)

Channel Capacity 80 Channels Up

80 Channels Down

Down Link Open Loop Gain 22 dB min

Gain Response Ripple 1.6dB maximum

Downlink Nominal Output Setpoint 0dBm

Up Link Open Loop Gain 22 dB min

Gain Response Ripple 1.6dB maximum

Uplink Nominal Output Setpoint 0dBm

Typical AGC LED Threshold -18dBm

Operating Voltage 8V to 17Vdc

Current Requirement @ 12VDC 250mA max

Approved Explosion Protection rating (ia) PENDING

Inspection Authority Certificate (ia) PENDING

Through current capacity 3.0A max.

CLC 0dB – 15.5dB Attenuated Gain (Up & Down) 0.5dB steps

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BDA's are inserted into the Leaky Feeder cables (transmission lines) to compensate for the longitudinal losses through the cable. Leaky Feeder gradually radiates a portion of the radio power contained in the cab replenished by the BDA's. As such, their primary electrical specifications are based around the following attributes:

SELECTIVITY - Ability to pass wanted frequencies and reject interferers GAIN RESPONSE RIPPLE - Deviation of Gain from centre of pass band. OPEN LOOP GAIN - Ability to amplify small signals to their original strength OUTPUT POWER SET POINT - Nominal radio signal strength amplifiers strives to retain at

output NOISE FIGURE - BDA's contribution to overall system noise floor CHANNEL CAPACITY - Number of simultaneous radio communication channels


Operating Temperature Limits -20oC to +40

oC

Storage Temperature Limits -40oC to + 65

oC

Operating Altitude Up to 5500m ASL

Operating Humidity 10 to 85% (Non Condensing)

Protection Class IP66 according to EN60529

Impact Resistance 7Nm – Body Only – Not indicator lights

Flammability UL94 V-O

Toxicity Halogen and Cadmium Free

Electromagnetic Interference (EMI) FCC Emissions Class A (Industrial) CE Emissions Class A (Industrial)

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Width (Excluding mounting brackets) 230mm

Height (Excluding mounting brackets) 75mm

Depth (Excluding mounting brackets) 61mm

Weight 1.24kg

Principal Materials Enclosure: Glass Reinforced Polyester GRP Connectors: Electroplated Brass Thermoplastic polymer glass fiber

Enclosure Kestrel „KE‟ & „POK‟ glass reinforced polyester type

Certificate number Baseefa 03ATEX0571X

Certificate held by Weidmuller Interface GmbH & Co

Compliance EN50014 : 1997 + Amendments 1 & 2 EN50019 : 2000

Finish Black

Gasket Silicon rubber

Mounting Options 4 holes M6 directly

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The CLC (Cable Length Compensation) of the Bi-Directional Amplifier allows the installation technician to simulate an additional length of cable on the Base Station (left hand) side of the Amlifier. On an Amplifier‟s PCB you‟ll find two dip switches and one rotary switch with sixteen possible settings, enabeling the installation technician to change the CLC settings and make alterations as desired. To explain the cable length compensation a table is layed out below: No compentation is made when the rotary switch is set on zero, the arrow pointing towards the zero symbol, and both the dip switches are switched off. When altering the CLC interface each single adjustment will approximately add an additional 0.5dB compensation to the main line (from the Base Station side of the Amplifier).

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The AGC takes care of any further errors.

Setting

dB CLC (Cable Length Compensation)

Rotary position 0 1 2 3 4 5 6 7 8 9 A B C D E F

DIP

SW

ITC

HE

S

DIP1 OFF

DIP2 OFF 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

DIP1 ON

DIP2 OFF 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5

DIP1 OFF

DIP2 ON 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 21.5 22 22.5 23 23.5

DIP1 ON

DIP2 ON 24 24.5 25 25.5 26 26.5 27 27.5 28 28.5 29 29.5 30 30.5 31 31.5

Table showing the cable length compensation (CLC) of the amplifing unit.

• The rotary switch has 16 positions. Each position represents -0.5dB CLC compensation. • For accurate assessment ensure that both the DIP switches are OFF before adjusting. • On the rotary switch, point the arrow towards 0, this will result in a 0dB CLC, setting the rotary switch on

F will add -7.5dB CLC. • Switching ON the +8dB switch increases the rotary switch value by 8dB, giving you an 8 to 15.5dB range. • Switching ON the +16dB switch increases the rotary switch value by 16dB, giving you a 16 to 22.5dB

range. • Switching ON both the +8dB and the +16dB switch increases the rotary switch value by 24dB, giving you

a 24 to 31.5dB CLC range.

IR RX: Indicates whether the infrared modem is receiving. IR TX: Indicates whether the infrared modem is transmitting. RxD: The downlink is receiving. TxD: The downlink is transmitting. PSU OK.: The power supply is supplying the correct power. DOWNLINK AGC: The Automatic Gain Control is enabled and working on

the downlink. UPLINK AGC: The Automatic Gain Control is enabled and working on

the uplink. B.D.A FAULT: The BDA is in fault state e.g. there is an error.

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In Becker Electronics CATS (Central Asset Tracking System) there is a mapping module that can show the status of each connected RD BDA. Picture showing the Map Designer in CATS zoomed out. Note that the names of the amplifiers are not showing.

The same map at a larger zoom level. Note the names of each unit. Of more importance is the RD BDA RF Power status for both uplink and downlink communication.

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This is a screenshot with one RD BDA‟s diagnostic data showing.

Pantha Serial Communication is provided with the CATS Central Asset Tracking System software. It provides debugging and communication information over a leaky feeder, ethernet and serial communications. It is also the basis for setting the RD BDA up.

This is the first screen when Pantha is opened. The first step is to connect to a port. If the port you connect to is not on the “Configured Ports” or “Available Ports” list, then click on the “Add Port” button. Pantha will then search for available COM ports. The available ports will then be listed in the “Available Ports” list. If the COM port you are looking for is not in the list then check your Windows setup.

Click on the available port and then click on the “Add Port” button. This will put the port on the “Configured Ports” list. Click on the port to highlight it. The port and its settings will show on the right-hand side of the window. In the “Serial Port tab, make sure the Baud Rate is set at 57600. You can add your own description in the “Description” field.

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In the “Engine” tab, make sure Engine Mode is set to Polling Controller. Care must be taken to not to set the Polling Time too high for buffer overruns. The default 400 msec would suffice.

On the Database tab, the settings for the database that which unto all the data must be stored in can be edited. This is optional.

The “Activity” main tab is to show ongoing communication between Pantha and devices connected to the COM port. It can also interrogate the connected COM port for connected devices and lists them on the “Devices” tab. To send an “All Call” command (which commands devices on the bus to reply with their ID‟s) to all connected devices the “Discover Devices” button must be clicked.


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If the RD BDA was not discovered and the operator knows the address for the devices it can be manually added. Type the address in first. Select “RDBDA-xxx “Diagnostic Amplifier” from the Device, Type combo-box and click on the Add New button. To edit the configuration of the connected RD BDA, click on its entry on the list of configured devices, and click on “Load Configuration from device”. To save any configuration changes to the device, click on “Write configuration to device.”

The “General” sub-tab of the “Configuration” tab sets the following: i) Maximum time delay before it

sends its information back in response to a device lookup command in the “Max All Call Delay” field.

ii) “”Periodic Diagnostic Tx” sets the delay between diagnostics results being sent by the RD BDA unit.

iii) “Display Mode” is to set the

unit‟s OLED screen in its different modes. Please refer to the section “OLED Screens, screen modes and explanations”.

Mode “OLED Screens, screen modes and explanations” reference

Rotate Screen Iterates between its screen modes every 10 seconds.

Bar Graph Screen Screen 4, Screen mode 1

Power Screen Screen 5, Screen mode 2

Downlink/Uplink Screen Screen 5, Screen mode 3

ADC Raw Screen Screen 6, Screen mode 4

Serial/Radio Settings Screen 7, Screen mode 5

Radio Diagnostics Display Screen 8, Screen mode 6

Screen Off Puts the OLED screen off.

iv) “Bar Graph Resolution” changes the bar graph resolution (Section “OLED Screens, screen modes and

explanations” sub-section Screen 4, Screen mode 1 has more information on this). v) To disable checking periodically if the device is still connected, enable the checkbox on “Disable

Polling”.

Device Address Device Type

List of configured devices

Write configuration to device

Load configuration from device


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The “Radio” sub-tab of the “Configuration” tab sets the following: i) “Radio Source” can be set

between “Antenna” or “Coax” ii) “RF Attenuation” is there to set

the amplification limits in decibel at which the RF power signal is limited at.

iii) “Transmit Frequency” is the uplink frequency relative to the RD BDA at which the RD BDA communicates at.

iv) “Transmit Baud-rate” is the Baud Rate at which the RD BDA communicates at.

v) “Key Up Time” is the time a voltage signal in the Head End must be kept high to initiate

devices so that the devices know when to start communicating. vi) “Key Down Time” is the time the voltage signal in the Head End must be kept high to let the devices

know that they must stop communicating. vii) “Receive Frequency” is the downlink frequency relative the RD BDA at which the RD BDA

communicates at. viii) x) “Receive Baudrate” is the

Baud Rate at which the RD BDA communicates at.

The “Limits” sub-tab of the “Configuration” tab sets the minimum and maximum limits in the device for various fields before an error state is generated in the unit.

i) “V System In” is the input voltage

ii) “V Local 2V7” is the 2 Volt power rail voltage.

iii) “V Local 3V” is the 3 Volt power rail voltage.

iv) “V Local 4V” is the 4 Volt power rail voltage.

v) “V Local 12V” is the 12 Volt power rail voltage.

The “Advanced” sub-tab of the “Configuration” tab sets the following for downlink and uplink:

i) “Low Low Threshold” – the ADC RAW value for at which the RF power is at its minimum (please see the section “OLED Screens, screen modes and explanations” sub-section “Screen 4, Screen mode 1”.) This is the value at which the RF power is in LL state.

ii) “Low Threshold” – same as above but for the L state.

iii) “High Threshold” – same as (i) but the RF power value is in H state.

iv) “High High Threshold” – same as above but for the HH state.

v) “Downlink Gain” or “Uplink Gain” is the decibel gain the amplifier is putting on the respective downlink or uplink paths.


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vi) “Downlink Offset” or “Uplink Offset” is the compensating factor between the power output and

attenuation. The “Power Supply” sub-tab of the “Diagnostics” tab is there to display information sent from the RD BDA about voltages in its Power Supply. i) “V System In” is the voltage of the

voltage put into the power supply. ii) “V System Out” is the voltage the

power supply is supplying. iii) “V Local 2V7” is voltage of the 2V

power rail. iv) “V Local 3V” is the voltage of the

3V power rail. v) “V Local 12V” is the voltage of the

12V power rail. The “Amplifier” sub-tab of the “Diagnostics” tab is there to display information sent from the RD BDA about the amplifying status of uplink and downlink. i) “Downlink Power In” is the

downlink RF power before being amplified.

ii) “Downlink Power Out” is the downlink RF power after being amplified.

iii) “Downlink AGC Attenuation” is the maximum RF power to which downlink signal will be amplified at.

iv) “Downlink CLC” is the Cable Length Compensation done on the downlink by the RD BDA unit.

v) “Uplink Power In” is the uplink RF power before being amplified. vi) “Uplink Power Out” is the uplink RF power after being amplified. vii) “Uplink AGC Attenuation” is the maximum RF power to which the uplink signal will be amplified at. viii) “Uplink CLC” is the Cable Length Compensation done on the uplink by the RD BDA unit.

The “RAW ADC” sub-tab of the “Diagnostics” tab is there to display advance information sent from the RD BDA about the amplification and attenuation control. This gives operators an even deeper level of understanding on how the RD BDA internals is interpreting feedback and attenuation control. The RD BDA works essentially with 3 voltage ratings – “Set Point”, “Control” and “Feedback”. “Set Point” voltage is a set voltage that oscillates with very low amplitude. When RF power is applied unto a leaky feeder system, the feedback voltage will start to rise from a low voltage value. When it reaches the “Set Point” voltage, the “Control” voltage starts lowering in


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such a way that if you graph it the graph would look like the inverse of the “Feedback” voltage graph (if the feedback was not attenuated). Thus, the lowering of the “Control” voltage keeps the “Feedback” voltage in check that it doesn‟t surpass the “Set Point” voltage. The “RAW ADC” tabs gives information on these three voltages for forward (downlink) and reverse (uplink) signal flow. i) “Forward Set Point” is the

downlink “Set Point” voltage. ii) “Forward Control” is the

downlink “Control” voltage. iii) “Forward Feedback” is the

downlink “Feedback” voltage iv) “Reverse Set Point” is the

uplink “Set Point” voltage. v) “Reverse Control” is the uplink

“Control” voltage. vi) “Reverse Feedback” is the

uplink “Feedback” voltage. The “Trends” sub-tab of the “Diagnostics” tab is there to display information sent from the RD BDA in graphs to better understand what the RDBDA is doing.

Check Boxes next to the labels enable trends of specific items on the trend graph. The “Device Status” tab is there to give a broad overview on the health of a running RD BDA unit. By setting thresholds in the “Configuration” tab a quick overview by the device can be given whether certain RF power states are in OK or in FAULT state.

The “Statistics” tab is there to give the following statistics: 1. Last diagnostics transmission time

in “Last TX Time.” 2. Last diagnostics receive time in

“Last Rx Time.” 3. “Sent Packets” is the total of sent

packets by the unit. 4. “Decoded Packets” is the total of

packets received by the unit and successfully translated into a command for the unit.

5. “Unknown Commands” is the total commands received by the unit that is successfully decoded but not understood by the unit.

6. “Timed Out Packets” is the total of timed out packets.

7. “Retried Packets” is the total of packets resent by the unit in order to retry communication commands.


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“Telemetry Events” is communication packets from devices with regards to telemetry/diagnostic results on the COM port. This Events History is filtered from other serial activities from the “Activity” tab. By double-clicking on a line the specific “Data Point” or telemetry field from a device will be chartered in the “Chartered Data” tab. This is the result. Panning in the chart is done by holding in the right-mouse button and dragging.

Zooming in is done by holding in the left mouse button and dragging over an area.

Description What’s In The Box

Part No: URDM-100 USM – XXXXXX (Base Part No.) (Serial No)

UHF Remote Diagnostic Bi-Directional AMP

Datasheet

Test Results Sheet

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