HR Smith Products (15)
The need to accurately pinpoint downed aircraft through the use of a Crash Position Indicator (CPI) or Automatically Deployable Beacon (ADELT) has always existed.
The Techtest 503-16 deployable ELT series combines full Cospas/Sarsat coverage together with the transmission of last known GPS co-ordinates to accurately locate downed aircraft.
Features include; on aircraft programming
of Cospas/Sarsat protocols allowing for easy removal and replacement of the beacon,
a modular design allowing for ease of maintenance and a multi-axis programmable G-Switch that ensures reliable operation against CAA Specification 16.
The 503-16 series is utilised globally by all major helicopter manufactures and operators.
The 13-150 series of antennas offers significally reduced visual profile with electrical performance comparable to passive antennas more than twice the size. These antennas are adaptable to multi band frequency requirements with added UHF functionality already acheived within the same footprint.
The 13-150 series of antennas utilise advance high speed switching circuitry techniques to achieve high levels of gain performance. This is made possible by each antenna holding an individually programmed EPROM memory device which can store a unique set of antenna calibration data pre-defined for the finalised platform. When the radio is tuned to a frequency it sends a frequency word to the internal Logic Converter Unit, this word is then deciphered into a binary format and enables the antenna to switch to the sent frequency. (All of this process happens in <50 microseconds) As the antenna holds all the calibrated frequency data it enables any antenna to work on any platform without the antenna having to return to the factory.
- Low Visual Profile <1 metre
- Spring mounted on a NATO four hole base
- Specifically designed for use on land and sea
- based vehicles
- Fast silent tuning less than 50 microseconds
- Compatible with frequency hopping
- secure speech networks
- Unique memory system (allowing 'in theatre'
- part swap)
- Multi band operation
- Out of band signal filtering
- 50 W CW Power Handling (VTAC)
|Typical radio interfaces|
|V.S.W.R.||â¤ 3.0:1 VHF and UHF|
|RF Connectors||Two(2) TNC Female|
|DC Connectors||MIL Series II|
|(other colours available on request)|
|Environmental Qualifications:||Tested and qualified to MIL-STD 810E|
|Typical Radio Interfaces||Rockwell Collins Flexnet Series|
|Rhode & Schwarz M3AR|
|Raytheon ARC231 and 232|
|Elmer SRT651 Series|
|(Compatible with other radio types on request)|
|Installation||Good electrical contact must be maintained between the antenna base and the vehicle shell|
|Vendor Code (NSN)||K6543|
The 500-30 is a direct upgrade replacement for the URT33 and URT44 beacons providing aircrew with a 406MHz with embedded GPS beacon as a plug and play replacement.
Once on the ground the pilot can utilise the integrated antennas including GPS to provide portable functionality. With visual indicators and audible sounder the beacon provides aircrew with certainty of transmission. Manual control provides the option to suppress transmissions where circumstance requires.
Automatic activation is available via a lanyard system. The beacon is compatible with pre-existing automatic activation mechanisms on the ACES II/III ejection seats, Martin Baker ejection seats and the BA-22/LPP back style parachutes.
The inclusion of GPS lat/long co-ordinates will provide rescue teams with location accuracy within 100m. In addition, the ability to home onto the established 121.5MHz and 234MHz SAR frequencies. An optional speech capability on 121.5MHz and 243MHz is also available.
- The 500-30 provides end users with the ability to reprogramme the 406MHz protocol to suit installation.
- Robust, compact and light-weight
- 48 hours transmission of 121.5 MHz and 24 hours of 406MHz at -20˚C
- GPS data transmitted via 406MHz
- Fully re-programmable 406MHz protocol
- Optional speech mode on 121.5MHz and 243MHz
- Simple Built-in-Test function
- Fully compatible with COSPAS SARSAT system
- Meets NATO STANAG 7007 and Eurocae ED-62A
- Interchangeable replacement for URT 33 PLB
- Manual and multiple automatic activation methods
- 5 year battery life
The PLB transmits modulated signals on 121.5MHz / 243MHz distress frequencies with characteristics in accordance with STANAG 7007, plus 406MHz in accordance with COSPAS/SARSAT.
|Modulation (121.5MHz / 243MHz)|
|Continuous Swept Tone of at least 700Hz within the Sweep Range.|
|Sweep Range||1.6KHz to 300Hz|
|Amplitude Modulated with Rectangular Wave|
|Modulation Depth 80% minimum|
|0.5 Secs 5W pulse every 50 secs.|
|Phase modulation of ±/3 rad (peak)|
|Digital modulation (see C/S G.005 Iss. 2 Rev 7, Section 3) to include:|
|Bit Synchronisation||Frame Synchronisation|
|Protected Field||Emergency-Code/National Use Field|
|GPS Receiver (Embedded)|
|Hot Start (avg)||<1 sec typical||Sat. Signal Reacquisition Time||100ms|
|Warm Start (avg)||<31 sec typical||Number of Channels||66(Search) 22(Track)|
|Cold Start (avg)||<31 sec typical||Min Signal Level Tracked||-165dBw|
|Receiver||L1 C/A Code||Power Consumption||13mA|
|406MHz||24 hours min 5W (+37dBm ±2dBm) at -20 degrees C|
|121.5/243MHz||48 hours min >100mW (+20dBm) at -20 degrees C|
|Manual ARM/OFF SWITCH|
|Automatic BA22 Interface / ACES II/III Remote Activation Cable|
|Martin Baker ejection seats|
|Dimensions||125mm x 70mm x 33mm nominal|
|The unit is designed to survive for up to 20 years with the only maintenance being battery replacement every five years.|
|The PLB is compliant with the following specifications:|
|Civil||EUROCAE ED62A / RTCA DO-204A|
|EUROCAE ED14F/RTCA DO-160F/
COSPAS / SARSAT
|Military||NATO - STANAG 7007 / MIL STD 810G|
|500-30||121.5, 406 & GPS|
|500-30-B||121.5, 406, GPS & SMB Connector|
|500-30-C||121.5, 243, 406, GPS, SMB & Speech|
|500-30-D||121.5, 243, 406, GPS, SMB|
|500-30-E||121.5, 243, 406, GPS, SMB, Speech & Float|
All variants are also available in yellow or with a remote activation cable.
- Multi-beacon DF
- Single compact antenna unit
- High sensitivity receiver
- Fully COSPAS-SARSAT compatible
The Techtest DF system is designed to reduce the time to locate emergency locator beacons. It is compatible with both 121.5MHz swept tone distress beacons and 406MHz COSPAS-SARSAT transmissions on current and future frequencies.
The user is able to monitor four frequencies and detect emergency transmissions. Each transmission is allocated a unique identification which can then be selected for more detailed information.
For 121.5MHz the system can display relative bearing details.
For 406MHz the system will give all the same information as 121.5MHz but in addition will record and decode the COSPAS-SARSAT message, giving details of the distress beacon and if available the GPS beacon location.
The system comprises of three modules
- 1. Antenna (10-246-1) The Antenna is a single compact module comprising a circular array of elements with integral high sensitivity receivers. The array is designed to give optimal angular resolution of the emitters.
- 2. Control Unit (406-28) The Control Unit takes the array output and, using a digital processing and advanced beam forming technique, is able to discriminate multiple emitters and direction find on the signals. All the data is processed using intelligent algorithms to reduce system noise and spurious responses.
- 3. Display (407-3) Different display options are available and are platform specific. The basic display module is based on the Techtest 407-2 unit. This unit is designed for ease of use featuring mode and scroll controls and a dual function uncluttered graphic LCD display. A secondary display option is available.
In normal operating mode the DF receiver frequency is switched cyclically between 121.5, 156.8 and 243 MHz. If a signal above the threshhold is detected, a 0.3 second snapshot is recorded before continuing. A separate receiver is used to continuously monitor the 406 SARSAT frequency. If a signal is detected then the DF receiver will immediately switch to 406MHz frequency and record a snapshot. In the event of transmitting beacons incorporating a GPS position, the system will display the applicable lat/long co-ordinates.
Direction Finding / Homing
A 360Ë direction finding facility is provided giving a direction for the aircraft to fly to the transmitting beacon. No other navigation aids are required. If however on board GPS navigation systems are installed in the aircraft, system integration will provide aircrew with both an absolute bearing and distance information to the transmitting beacon.
In the Homing mode the system sequentially scans the distress frequencies and provides a visual display of left/right steer information.
Cockpit Controller / Indicator
The controller / indicator is mounted in the cockpit. There are just two controls : a push button mode selector (switching between Decode and DF modes), a rotary click / push selector providing control of menu options. The unit is designed to operate mainly without user input.
The user can select any of three modes:
- i) Left-Right Indicator: To show bearing relative to aircraft heading.
- ii) Map display: Showing relative positions, (or bearings), of all detected emitters, both from DF receiver and 406 Decoder.
- iii) Text Display: Ideal for 406 decoder information. Can also be used to display range and bearing data.
|Dimensions||Short 3/8 ATR (90x198x322mm)|
|SAR frequencies||121.5, 243, 156.8, 406 MHz|
|Training frequencies||4 selectable: 110 to 410 MHz|
|DF Accuracy||Better than 5Ë|
|Decoder Frequency||406.025 - 406.050 MHz|
|Message Format||COSPAS-SARSAT C/S T.001|
|Supply Volts||18-36V DC MIL-STD 704D|
|Cockpit Controller / Indicator||406-3|
|Dimensions||146 x 67 x 152mm|
|LCD Display||56 x 42mm (320 x 420 pixels)|
|Backlighting||NVIS Green B (MIL-STD 3009)|
|EMI/EMC||MIL-STD 461 F|
- COSPAS/SARSAT 406MHz Detection and Decoding
- Messages decoded and displayed in an easy to understand format
- Touch screen interface
- Internal Antenna
- Internal re-chargeable battery
- USB to PC connectivity
The Techtest 12-406-9 is specifically designed to detect, locate, and verify any 406MHz beacon transmission, including ELT or ADELT/CPI and EPIRBs. It can be used either as a test tool on the ground or as portable equipment on a SAR mission. It is able to immediately display the transmitted GPS Lat/Long location of the beacon if present and, in conjunction with the built in GPS receiver, display range and bearing information.
The handheld unit includes a colour touch screen providing a clear display of information with user configurable fields. The integral antenna results in a compact device easy to carry. Data is updated continuously as new messages are received and decoded (typically every 50 seconds from one beacon). If multiple beacons are transmitting then all are summarized on a scrolling display. Individual messages can be selected to display full decode information. Data can be transferred to a PC for later analysis.
The unit can be fixed to a wall, using an optional mounting tray, and configured as a remote monitoring station. In this case data is logged automatically by a Windows Based Application.
As manufacturers of antennas and SAR equipment, the company has always believed it of great importance to provide supporting equipment to these products. Over the years, this has resulted in a range of Test Sets being manufactured by Techtest.
Our range of VSWR Test Sets is known throughout the aviation community as the industry standard products for testing aircraft antennas. They are all available with ruggedized cases and models are available to cover all the frequencies commonly found in avionic equipment. These VSWR Test Sets allow antennas to be checked for correct operation and can be used whilst the antenna is still on the airframe thus saving costly removal of the antenna when it is not necessary.
It is vital that an Emergency Locator Transmitter works correctly, if it is used, so Techtest supply a range of test equipment to check correct operation of this type of equipment. These Test Sets can be used with all types and makes of ELTs and EPIRBs.
The need for Search and Rescue (SAR) services to accurately detect and locate the distress signals from emergency beacons resulted in Techtest developing its range of Homing Systems.
These use a phase comparison method to provide left-right steering information, to the SAR pilot enabling him to locate emergency beacons operating on all the standard distress frequencies (121.5 MHz, 156.8 MHz, 243 MHz and 406 MHz). This type of system requires only two antennas and offers a more compact, lower cost solution to the more complex DF systems available.
Techtest now manufactures a range of Homer/Decoder systems which decode the unique data included in the COSPAS-SARSAT 406 MHz distress signal. This includes the position information from Location Protocol Beacons and gives the user real time information to help minimise rescue times. A number of integrated airborne systems are available as well as the unique Portable 406 SAR Decoder which is a fully self contained unit which can be carried on to any aircraft, boat or land vehicle. This unit is ideal for a SAR force which already has Homing/DF systems fitted but wishes to extend its capability to include 406 MHz decoding in a cost effective way.
12-406-7 Portable 406 SAR Decoder (PDF, 160Kb)
12-406 Homing Test Set (PDF, 436Kb)
406-2-053 Full NVIS Compatibility SAR Homing System (PDF, 284Kb)
406-407 Delivering real-time SAR 406 decode and position (PDF, 520Kb)
The Next Generation of ELT
The latest upgrade to the HR Smith 503 ELT series utilises the Iridium satellite network to provide an independent aircraft tracking and alerting function.
The addition of the Iridium service to the existing full Cospas/Sarsat coverage and transmission of last known GPS co-ordinates hugely increases the probability of accurately locating downed aircraft. The Iridium module allows for live aircraft tracking and can be programmed to activate the ELT under abnormal events.
Autonomous Tracking trigger events include:
- Loss of aircraft power
- Unusual altitude, attitude, speed or acceleration.
- Diversion from geo-fence or flight path Plus many other programmable parameters
If any of these user defined thresholds are exceeded the ELT will be activated. A Distress Tracking option is also available, which activates the ELT in the event of an imminent accident. The activation triggers for distress tracking are designed to meet EUROCAE ED237. Existing 503 series ELT customers wanting to upgrade to the Iridium functionality need only replace the G-Switch module and Antenna, due to the unique modular construction of the 503 series ELT system. The 503 series is utilised globally by all major rotary and fixed wing manufactures and operators.
The 500 series of Personal Locator Beacons or Survival Emergency Locator Transmitters offers a wide range of options to suit any requirement. The 500 series of Personal Locator Beacons has been chosen by a wide customer base, including armed forces, commercial airlines, off-shore helicopter operators, life raft manufacturers and ejection seat manufacturers.
For all the 500 series Personal Locator Beacons, Techtest has obtained full certification to aircraft standards so these products should not be confused with inferior quality beacons intended for hobby use.
The 500-1 Personal Locator Beacon is a compact light-weight unit operating on 121.5 MHz and 243 MHz and has been favoured by customers requiring a small beacon for many years.
The 500-12 Personal Locator Beacon is designed to work with the COSPAS-SARSAT search and rescue satellite system and features 406 MHz as well as 121.5 MHz and 243 MHz distress signals. It also incorporates a speech function which allows survivors to have two way voice communication with a rescue craft. In addition to the normal aircraft approvals the 500-12 also has full Boeing and Airbus approvals making it the natural choice for commercial airline operators due to its compact size and low weight. The 500-27 shares all the functionality of the 500-12 but also incorporates embedded GPS to minimize location time in the event of an emergency.
The latest 500-27-07 PLB (above right) utilizes all the proven electronics of its predecessors but updates the casing design to give a modern stylish appearance without losing the rugged and durable qualities associated with Techtest SAR products.
The new 500-32 PLB (above left) offers similar features to the 500-27-07 but in a significantly smaller package (35% reduction in volume). This has been achieved by using state-of-the-art battery technology and optimised electronics.
After rigorous testing the 500-32 series of ELT(s) or PLB has recently been awarded a COSPAS SARSAT type approval (Certificate No. 223).
500-30, 406 MHz Ejection Seat Compatible PLB
The 500-30 is the latest member of the highly successful Techtest PLB range offering 406MHZ transmission and Guard frequency transmission combined with embedded GPS to
provide positional accuracy of 100m.
With both manual and automatic activation capability the beacon offers maximum flexibility across a fleet of aircraft. Providing interface solutions for inclusion in PSPs within ejection seats such as ACES II/III and in combination with parachute activation mechanisms such as the BA22. Once activated upon ejection the PLB will transmit SAR frequency signals via remote antennas allowing rapid recovery.
Once on the ground aircrew can continue to transit using remote or integrated dual frequency antennas including GPS providing portable functionality and the ability to control beacon transmission according to circumstance. With 5 year battery life, 48 hours transmission on 121.5MHz and 24hours on 406MHz at -20 °C the 500-30 meets COSPAS SARSAT, ED-62A, STANAG 7007 and MIL-STD 810F specifications.
500-12 Multi Function Personal Locator Beacon
500-27 Multi Function Personal Locator Beacon + Embedded GPS
500-27-07 Multi Function Personal Locator Beacon + Embedded GPS
500-30 Multi Function Personal Locator Beacon
500-32 406MHz Multi Function Personal Locator Beacon
12-503-5 Programming Test Set
For many years, HR Smith (Technical Developments) have been manufacturing a range of Static Dischargers for all aircraft platforms from GA aircraft through commercial airliners to fast jet applications.
The company manufactures a version of its range of dischargers by conventional techniques using aluminium castings with composite rods but has pioneered the introduction of its range of all plastic static dischargers. This type of discharger is manufactured from advanced thermo-set plastics and offers a number of advantages over the conventional design. These include light weight, improved noise resistance, lightning strike resistance and low cost of ownership.
Modern electrical and RF systems require that joints between metallic surfaces remain in good electrical contact and free from corrosion. To ensure this, HR Smith (Technical Developments) has developed a range of conductive sealing gaskets.
The âwet-fitâ range use a thin sheet of aluminium alloy or nickel alloy and a two-part epoxy resin to give the ultimate in corrosion resistance while still retaining high electrical conductivity. The gasket can be stamped out in any shape and can be purchased separately from the sealant or can be supplied as a kit with the sealant.
The company designed, and obtained a world-wide patent on its âdry-fitâ range of gaskets. These gaskets again use aluminium or nickel alloy sheet but the sheet is sandwiched between two sheets of polyethylene foam. This means there is no requirement for a sealant and fitting is simpler and less time consuming. The âdry-fitâ gasket still provides excellent corrosion protection and due to the unique way it is stamped provides electrical continuity.
10-500-11 Conductive Sealing Gaskets (PDF, 360Kb)
10-500-11 Conductive Sealing Gaskets Technical Data (PDF, 760Kb)
10-500-11A Dry Fit Conductive Anti-Corrosion Gaskets (Airborne Antenna Brochure) (PDF, 3.1Mb)
HR Smith (Technical Developments) first became involved in conformal antennas with the development and manufacture of the VHF Fin-Cap antenna for the BAe Systems Hawk aircraft.
The company now has experience in a wide range of conformal antenna designs for VHF, UHF, HF, Radalt and VOR/LOC applications on both military and commercial platforms.
The Company also specialises in the manufacture of conformal antennas for Emergency Locator Transmitters. These allow a more tailored ELT solution on specialist aircraft such as fast jets.
HR Smith (Technical Developments) are the leading manufacture of aircraft data antennas. From IFF antennas, Link 16 and GPS antennas through to the latest satellite communication antennas, designed to work with the Thuyraya and Iridium satellite systems, the company employs the latest technology to design and produce state of the art antenna solutions.
The company has developed a range of switched lobe antennas to work with the latest inter-aircraft fast data transfer systems employed on both military and commercial aircraft.
HR Smith (Technical Developments) manufactures a wide range of VOR/LOC, Marker Beacon and Glide Slope antennas for both commercial and military applications.
The range of light weight thermoplastic navigation antennas is ideal for all commercial aircraft applications and can be supplied with a full range of accessories such as Couplers, Diplexers and Filters.
In addition, the company manufactures a range of navigation antennas suitable for military aircraft with speed ratings up to Mach 2.5. The company specialises in providing navigation antenna solutions for upgrading ex Warsaw Pact aircraft to allow them to operate alongside NATO forces.
Radio altimeter and passive and active GPS antennas are manufactured by HR Smith (Technical Developments) for fitment on both commercial and military platforms.