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No part of this manual may be copied, transcribed, translated or reproduced in any manner or form whatsoever, for
commercial purposes, without obtaining prior written permission from Barrett Communications Pty. Ltd. However,
limited copying is permitted for private use providing authorship is acknowledged.
The 2018 Mobile magnetic loop HF antenna design is protected by Australian patent 2001100423. Unlicensed
replication of the design is expressly forbidden.
BCM201800/6
© Barrett Communications
Head Office:
Barrett Communications Pty Ltd
47 Discovery Drive, Bibra Lake, WA 6163 Australia
Tel: +61 8 9434 1700 Fax: +61 8 9418 6757
Email:
information@barrettcommunications.com.au
www.barrettcommunications.com.au
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Summary of Contents for Barrett 2018
- Page 1 Barrett Communications Pty. Ltd. However, limited copying is permitted for private use providing authorship is acknowledged. The 2018 Mobile magnetic loop HF antenna design is protected by Australian patent 2001100423. Unlicensed replication of the design is expressly forbidden.
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Page 2: Table Of Contents
To Deploy the Antenna ......................23 To Stow the Antenna ........................24 Barrett Transceiver to 2018 Barrett Mobile Magnetic Loop Antenna Setup ......... 25 Supported Barrett Transceivers ....................25 Testing and Troubleshooting ......................25 ... - Page 3 J5 Jumper Settings ........................29 J6 Jumper Settings (DC Supply on RF Cable) ................. 29 J7 Jumper Settings ........................29 Parts List ............................. 30 Technical Specifications ........................31 3 of 31...
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Page 4: Introduction
Introduction Features • Highly efficient antenna, radiating 10 dB to 14 dB more than whip antennas. • Simpler installation – no need to weld on a mounting plate for a whip, and no separate tuner to install. Installation is therefore quicker and cheaper, and the system can be moved simply between vehicles. -
Page 5: General
The 2018 Mobile magnetic loop HF antenna is a technological breakthrough in vehicle-based HF radio communications. The 2018 Mobile magnetic loop HF antenna is available in a range of packages for fixed or removable installations and can be used with Barrett 2000 Series transceivers. The removable package can be installed without any drilling of holes in the vehicle. -
Page 6: About This Guide
The main purpose of this guide is to provide you with all the information you require to ensure optimum performance from your 2018 Mobile magnetic loop HF antenna. The Guide explains in detail how to operate the 2018 antenna once it has been installed by an authorised Barrett Communications representative. -
Page 7: Warnings And Advice
High Radio Frequency Voltages When transmitting, radio-frequency voltages up to 1500 V RMS are present on the radiating arm and associated cables of the 2018 Barrett Mobile Magnetic Loop Antenna. These voltages are sufficient to cause electrocution or severe radio frequency burns. -
Page 8: Storage Of Other Goods
Storage of Other Goods Goods of normal flammability (for example, tyres, suitcases, tents, etc) may be safely stored on the roof rack, however metallic items like tent poles should be secured away from the radiating arm to avoid degrading the ATU's performance. They should be secured so that no movement occurs during transport. -
Page 9: Overview
4WD’s, sedans, buses, trucks and prime movers. It is designed to minimise head wind noise with an angled deflector mounted on the front of the unit. A simplified diagram of the parts that make up the 2018 Mobile magnetic loop HF antenna is shown below. - Page 10 The antenna consists of a looped aluminium arm hinged to an aluminium roof rack which forms an effective ground plane. RF and DC power is supplied to the 2018 Barrett Mobile Magnetic Loop Antenna system from the transceiver. The vehicle battery supplies the transceiver with its DC power.
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Page 11: Installation
Installation Fitting on Vehicles With Gutters M10 Strut Nut (x16) M10 Strut Nut (x16) M10 Strut Nut (x16) Leg Spacer Leg Spacer Leg Spacer Viewing Hole Viewing Hole Viewing Hole Leg Mount (x8) Leg Mount (x8) Leg Mount (x8) Locating Rod Locating Rod Locating Rod (welded) -
Page 12: Setting Up The Roof Rack
Setting Up the Roof Rack Turn the rack upside down on either a bench or soft, non-abrasive surface. The diagram below illustrates how the strut nut works. Position the legs in the correct channels and tighten to the correct tension. M10 Bolt M10 Bolt M10 Bolt... - Page 13 Use legs with packers at positions A & D Use legs with packers at positions A & D Use legs with packers at positions A & D if necessary if necessary if necessary The measurements A-D vary according to the vehicle type. Use the supplied chart (in the above diagram) to determine these.
- Page 14 Important:- Ensure the feed cable is not damaged by being trapped between the ski bar mount and the roof-rack, shown below:- The correct position for the cable, running underneath the ski-bar mount, is shown below:- 14 of 31...
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Page 15: Preparing The Vehicle
Preparing the Vehicle Press the nylon channel to the bottom of the full gutter support and place in the gutter of the vehicle with the long edge against the vehicle and the short edge facing outwards. The following diagrams illustrate this. Full Gutter Support Full Gutter Support Full Gutter Support... - Page 16 Note:- On some vehicles, the hinge bolts of the doors may require loosening and the door and latch lowering. Contact your Barrett Communications representative if you have any problems. Barrett Communications Pty Ltd accepts no liability for damage to door seals, as correct fitting will ensure door seals are protected.
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Page 17: Fitting On Vehicles Without Gutters
Fitting on Vehicles Without Gutters Setting Up the Roof Rack Turn the rack upside down on either a bench or a soft non-abrasive surface. The diagram below illustrates how the strut nut works. Position the legs in the channels and tighten to the correct width. -
Page 18: Preparing The Vehicle
Use the following measurements to set the rack up correctly and tighten the bolts. A, B, C = 1055mm A, B, C = 1055mm A, B, C = 1055mm Important:- Double check the tightness of all the bolts. Preparing the Vehicle There are six fitting points on the vehicle, positioned at the front, centre and rear of the roof. - Page 19 Place the leg support rails on the inner side of the clamp (which have been hooked in position and are taped back, now standing upright). Pull the leg support rail gently against the clamps, ensuring that the rail is protruding the same distance forwards and backwards from the front and rear clamps. See the following diagram.
- Page 20 Align the leg mounts with the clamps and check that the rack is centred on the vehicle. Place the “U” bolts through the slots in the leg mounts from the inside, and pass the threaded ends through the holes in the clamp. Re-attach the M6 washers and nuts. See the following diagram. Rubber Strip removed Rubber Strip removed Rubber Strip removed...
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Page 21: Maintenance
Retrofitting the 2018 Barrett Mobile Magnetic Loop Antenna If you are fitting the 2018 Barrett Mobile Magnetic Loop Antenna system to your existing rack, ensure that there is no paint or corrosion between the cable connectors and the antenna arm mount points. -
Page 22: Cabling
Once the cables have been mated with the connectors on the 2018 HF antenna, seal them with self- amalgamating tape to prevent water ingress. The coax cable from the RF feed box is connected directly to the TNC socket on the 2018 Mobile magnetic loop HF antenna tuner unit. -
Page 23: Operation
Operation Normally, when not in use, the antenna is in the folded down position. To use the system, the antenna must first be erected as shown in the above image. WARNING - The transceiver must not be transmitting whilst the antenna arm is being raised or lowered. -
Page 24: To Stow The Antenna
Unfold the Unfold the antenna antenna From the From the roof rack roof rack Rear Clip Rear Clip Rear Clip Reset the clip to its locked position when the boom is vertical to prevent it falling over during operation. To Stow the Antenna Simply reverse the directions for elevating the antenna. -
Page 25: Barrett Transceiver To 2018 Barrett Mobile Magnetic Loop Antenna Setup
After observing that the 2018 antenna tuning motor is running correctly, check that the correct tuning is obtained. Initiate a tune cycle as described above. If receiver noise does not increase or receive signal is not increased then a failed tune has occurred. -
Page 26: Troubleshooting
Troubleshooting The 2018 tuning motor does not run briefly after switching on the transceiver:- Check all cables. Check that DC is available to the ATU by using a multimeter on the pins of the connector on the DC lead. The 2018 antenna tuning motor runs but a tune failure signal occurs:- Check that the selected channel is in the range 3.9 to 12.5 MHz. -
Page 27: Testing
(at the rear). Slide the toroidal sensor over the cable and refit it securely in place. Attach the optic fibre to the meter. Choose a frequency within the 2018's operational band, initiate a tune sequence and observe the reading on the meter. Take measurements over the band noting the deflection remains greater half scale of the meter display. -
Page 28: External Connectors
Interrupted 12V supply Signal Ground Pulled low when tuning, returns high when TUNE tuning completed SCAN Indicates scan amplifier on. Active high Internal Jumper Configurations View of 2018 Mobile magnetic loop HF antenna PCB Component Side Overlay 28 of 31... -
Page 29: J5 Jumper Settings
J5 Jumper Settings +24V +12V J6 Jumper Settings (DC Supply on RF Cable) No DC supplied DC supplied J7 Jumper Settings BARRETT 29 of 31... -
Page 30: Parts List
SA-55061 Antenna Arm HV Cable SA-55062 ATU Ground Cable SA-55059 PW-57136 Delrin® Insulator 2018-00-01 and 2018 Mobile magnetic loop HF antenna BC201801 2018 Mobile magnetic loop HF antenna to transceiver control cable to 2018-01-01 suit 2050 transceiver 30 of 31... -
Page 31: Technical Specifications
1900 mm x 1250 mm x 780 mm (deployed) Environmental rating MIL-STD-810F (immersion). Fitted with a pressure equalising breather to equalise pressure without allowing the ingress of moisture. Barrett Communications Pty Ltd reserves the right to change the specifications without notice. 31 of 31...
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