1. Application
This service release (V4.22 SR1) is applicable to RT-2000 systems running with the Voyager hand-held terminal (HHT) only and is the result of an analysis of comments raised from operators over extended in-service experience. It consists of a package of software and hardware modifications, which are detailed below.

2. Software
2.1 Voyager HHT
Advantage has been taken of incorporating recent upgrades of Windows CE Operating System to:

• Eliminate screen flicker and ghosting by changes to the screen drivers.

• Improved screen contrast control over extended temperature range & during power-up

• Enhanced manual adjustment of contrast control.

• Retention of the Firmware during battery removal / replacement

• Improved internal communications provide more reliable and faster printing

• Improved communications between the Voyager HHT and DCU

• New reset procedure

• The Helitune application software is now stored in non-volatile (flash) memory providing more reliable and secure storage.

2.2 Application Firmware
A new soft reset procedure has been implemented which will reboot straight into the RT-2000 application. In addition pressing the hardware reset button (behind the bottom cover) will no longer cause the application to be loaded back into RAM when the Voyager is connected back to the DCU, thereby eliminating the delay this caused.

A new power recovery feature has been implemented where, should the DCU reboot during operation due to temporary power loss, the Voyager will automatically re-establish the serial connection. This allows the operator to continue to use the system from the point at which power was lost, without having to shutdown and restart the system from the beginning.

A facility has been added to the system menu to enable system errors displayed on the Voyager display to be printed so that a hardcopy record is produced.

The system will now automatically power off if ‘Abort’ is selected as a result of a BIT failure.

3. Hardware Release Notes
3.1 DCU
The battery charger PCB has been up-issued to cope with the voltage drop associated with 8m cables.

A small fan is fitted inside the DCU to ensure even air circulation and increased component life.

The PCMCIA card reader has been modified to ensure compatibility with the latest generation of PCMCIA card types supported by Helitune.

A revision to the power supply filter PCB has been made that has been shown to significantly improve EMC performance of the RT-2000 DCU emissions following revalidation of the compliance tests.

3.2 Voyager HHT
Reliability and security of the DCU to HHT communications cable is enhanced by the elimination of the plastic connector and the Voyager terminal is to be upgraded to a 1031 series metal Fischer connector.

3.3 Cabling
Improved low loss, higher performance, 12 pin DCU - HHT cable is now available with a choice of in-line or right-angle connectors. This cable is available in four variants, which are fully interchangeable, choice is dependent on operator requirements.

3.4 Mk II Line Scan Tracker
Camera reliability is improved through revised (FPGA) start-up sequencing, the IR lamp has been given soft start to minimise loading.

4. Software Features Review
From an operators perspective the V4.22 SR1 release Helitune has addressed a number of issues and improvement requests received from operators:

4.1 Card Management facilities
Issues related to Time/Date are resolved by co-ordinating all time stamping between HHT and DCU in 24 hour clock format.

More flexibility has been provided when creating Tail Numbers and added intelligence now prevents the creation and storage of empty ‘Flights’ where no data has been collected.

4.2 Data Collection
An improved operator notification procedure for faults on accelerometer channels has been implemented, in an addition to that reported in the ‘Status’ area. Prior to the commencement of data collection, the system will now indicate to the operator any channels, which will subsequently be used for data collection, that show an accelerometer to be disconnected or short-circuit.

If a camera is not attached it is now impossible to access live track, and save null data. Similarly it is not possible to quit and save live track data before the track data is displayed, also a warning is now generated if previously collected ‘Auto’ track is about to be overwritten by a ‘Live Track’.

Although it is not recommended practise, the Application will now recognise the fact that a camera has been attached / removed whilst the system is ‘Active’.

4.3 Printing
Improvements in the print processing and print formatting have reduced the delay in system operation after completion of a print, inadvertent double hits of the print key no longer produce multiple prints, problems associated with running out of paper in middle of a print are also resolved.

4.4 Data Displays
Track data display updates have resolved formatting errors which were apparent when track display range / zoom changes were selected, the error in the track display of signs before Lead / Lag has been rectified to read ‘-Ld/+Lg’.

Flight condition points (‘G’ – ‘H’ – ‘1’ etc) on polar plots for which there are no solution sensitivities are displayed against a ‘Raw’ phase and appear on balance chart in an inverse video circle, and have an ’*’ against them in data listings. Those that have solution sensitivities, are plotted against the phase offset (bug) and appear in an inverse video square.

The speed at which the ‘Status’ display is presented after selection and at which it reverts to normal operation on de-selection has been improved. The card size and space remaining are now both reported in ‘Kbytes’.

Nr tune trend lines whose values exceed those of the current scale are no longer shown as horizontal lines.

All FFT’s are now initially shown in full range and not ‘zoomed’. The operator can select the zoom factor as required. The printed FFT now shows the ips and frequency values at the cursor position.