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2.5.2.2 Contact activation derived from transmitter push-to-talk (PTT) and receiver squelch or mute lift conditions should be used to initiate recording of radio signals (1060).
2.6 Analogue Signal Conditioning
2.6.1 Options for adjusting or disabling Automatic Gain Control (AGC) for individual inputs should be provided where it is used to compensate for variations in line interface levels (1061).
2.6.2 Companding (Compression - Expansion) techniques may be used to match the dynamic range of the line interface levels to that of the recording equipment.
2.7 Human Machine Interface
2.7.1 Audio Output
2.7.1.1 A front panel loudspeaker, volume control and on/off switch shall be provided on the equipment or on a separate remote control panel if this option is provided (1062).
2.7.1.2 A front panel standard headphone socket and volume control shall be provided on the equipment or on a separate remote control panel if this option is provided (1063).
2.7.2 Copy Output
2.7.2.1 A front panel or easily accessible output connector for making copy recordings shall be provided, which may have a preset output adjustment (1064).
2.7.2.2 The output shall comprise one audio channel, which shall be the selected recorded channel, and another audio channel which shall have either a voice synthesised (spoken) time output or tone coded time markers from, or derived from, the time and date information of the original recording (1065).
2.7.3 Security of Recordings
2.7.3.1 Techniques shall be used to reduce the possibility of inadvertent erasure of recorded information (1066).
NOTE: The use of software controlled password, electronic or mechanical keyswitch access or other measures may be appropriate. Where the use of such devices is not feasible, for example with analogue reel to reel magnetic tape recording equipment, the disabling of the recording/erase mechanism may be necessary, which would then require the provision of a separate bulk erase machine. The use of a single action to record without verification or protection should be avoided.
2.8 Removable Media
2.8.1 The recording equipment or systems shall be capable of providing complete, accurate and verifiable copies of the recorded data (see COM 01 paragraph 7.6.2) on removable media (2266). The type of media used and the file format employed must be acceptable for use by the CAA Transcription Unit (2267).
2.8.2 Guidance on the handling and storage of removable media shall be provided, as appropriate, with the equipment documentation (1068).
2.9 Replay Functions
2.9.1 The equipment shall be capable of replaying the original recorded communications on archival media in a continuous 'real time' mode and presenting the time and date information separately from, but synchronized with, the recorded communications (1069).
NOTE: The capability to replay in a continuous ‘real time’ mode means that the messages can be replayed continuously without interruption or any manual intervention, with any periods of silence or absence of recorded messages re-inserted.
3 Analogue Equipment
Analogue recording equipment is classified as that which records analogue signals in real time directly onto the archival media. Typically magnetic tape reel to reel or cassette transport systems utilising electronic, electrical and mechanical devices are used.
3.1 Recording Check
3.1.1 Devices and/or techniques shall be incorporated to provide a check for successful recording onto archival media (1070).
NOTE: Magnetic tape transport systems can employ off tape monitoring to establish that successful recording has taken place.
3.2 Recording Quality
3.2.1 When compared with a reference of –10dBm at 1,200 Hz, the amplitude variation from 300 Hz to 3,400 Hz shall not exceed ± 3dB (1071)
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CAP 670 Air Traffic Services Safety Requirements 2(4)
