sonardyne uk (head office) t. +44 (0) 1252 872288 f. +44 (0) 1252 876100 e. sales@sonardyne.com www.sonardyne.com datasheet programmable generic transponder (pgt) description the programmable generic transponder (pgt) is the successor to sonardyne's popular type 7730 hpr transponder/responder. available in three versions; type 7971 omni-directional, type 7977 directional and type 7978 super directional, the pgt family incorporates sonardyne's latest acoustic design developments with the hardware already installed to permit through-life upgrading of functionality. features include a depth telemetry capability for improved positioning accuracy, channel selection via dual external controls (or optional serial data link) and innovative 'screw-off' acoustic release mechanism. these benefits are combined with an increased depth rating (2,500m, 4,000m or 6,000m) and compatibility with all hpr 300 and hpr 400 channels. where size and weight are important operational factors a short housing version is available (requires external power supply). applications for the pgt include the accurate tracking of cable ploughs and deep rovs, long term marking of seabed targets (e.g. wellheads) and as a position reference transponder for dynamic positioning systems. key features ? depth rated to 2,500 metres (4,000 metre rated option available) ? channel selection via dual external controls or optional serial data port ? depth telemetry capability option ? 'screw-off' acoustic release available ? choice of housing lengths to suit deployment scenario and application type 7977/7978 ? depth rated to 2,500 metres (4,000 & 6,000 metre rated option available) ? high power directional and super directional transducers ? depth telemetry capability option ? 'screw-off' acoustic release available' ? external on/off and channel controls ? choice of short (no battery) or long housing available
sonardyne uk (head office) t. +44 (0) 1252 872288 f. +44 (0) 1252 876100 e. sales@sonardyne.com www.sonardyne.com specifications subject to change without notice - 10/2006 specifications programmable generic transponder (pgt) feature type 7971 type 7977 type 7978 depth rating 2,500 metres (4,000 metre option available) 2,500 metres (4,000 metre option available) 2,500 metres (4,000 & 6,000 metre options available) operating frequency channels hpr 300/400 channels hpr 300/400 channels hpr 300/400 channels transducer beamshape omni-directional 130o directional 30o super-directional 12o transmit source level (db re 1pa @1m) 192db 3db 200db 3db 206 3db number of transmission (high power on channel 33) alkaline:1.0 x 10 lithium:2.3 x10 alkaline: 0.8x10 lithium: 1.8x10 alkaline: 0.5x10 lithium: 1.2x10 receive sensitivity <85db re 1pa <85db re 1pa <85db re 1pa listening life (days) alkaline: 3.7 years, lithium: 6.1 years alkaline: 3.7 years, lithium: 6.1 years alkaline: 3.7 years, lithium: 6.1 years mechanical construction aluminium alloy, hard anodised aluminium alloy, hard anodised aluminium alloy, hard anodised dimensions (lxdia) 1107mm x 183mm 1107mm x 183mm 1107mm x 183mm weight in air 22kg 22kg 22kg weight in water 9kg 9kg 9kg features pressure relief safety valve, external channel selection control external on/off control, high/low transmit power set via rs232 port (if fitted) options alkaline or lithium short (no battery) or long housing responder/charging/comms connector (bulkhead connector 5 pin mccartney mc bh5m) screw-off? acoustic release mechanism depth sensor (2,000m, 4,000m or 6,000m options)
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