Garmin Acc,Xdcr,R109LHW,CHIRP,2kW,External Mount w/Fairing

This is an Airmar R109 series CHIRP transducer, sold through Garmin marine electronics channels as an accessory transducer for Garmin's high-power sportfishing sonar modules (such as the GSD 28 in this same range). The R109LHW variant is the Low/High/Wide-beam configuration, meaning it covers both the traditional low CHIRP band (roughly 38-75 kHz) and the high CHIRP band (roughly 150-250 kHz) from a single housing, with a wide, constant beam pattern on the high-frequency side rather than a narrow spot beam. This particular listing is the external-mount version fitted with a fairing block, an alternative to the standard flush thru-hull housing used when a hull has enough deadrise that a wedge-shaped fairing is needed to keep the transducer face running true and level in the water.
Rated at 2 kW of transmit power, it's built for serious offshore bottom and fish-finding work -- real target separation and clean arches at depth rather than a basic recreational fishfinder image. Airmar specifies a maximum operating depth around 8,000 ft and a beamwidth of roughly 9x23 degrees, or a constant 25 degrees on the high band, which is what gives the wide-beam ('W') coverage its name -- about twice the bottom coverage of a typical narrow high-frequency beam, at the cost of some resolution versus a true pencil beam. It ships with a long cable (commonly around 49 ft for this transducer family) terminating in bare wires for connection to a compatible black-box sounder module rather than a plug-and-play connector, and mounts through the hull with the external fairing block supplied for angled-hull installations.
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Sonar/Transducer
- Manufacturer: Airmar (R109 series, sold as a Garmin marine sonar accessory)
- Model: R109LHW -- Low/High/Wide-beam CHIRP
- Power rating: 2 kW
- Low CHIRP band: Approx. 38-75 kHz
- High CHIRP band: Approx. 150-250 kHz
- Beamwidth: Approx. 9x23°, constant 25° on the high band
- Max depth: Approx. 8,000 ft
Physical/Mounting
- Mount type: External mount with fairing block (for angled/deadrise hulls)
- Connection: Bare-wire lead, no plug connector
- Cable length: Approx. 49 ft (typical for this transducer family)
Compatibility
- Use: Pairs with a compatible Garmin/Airmar black-box sonar module such as GSD 28