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Airmar B75 High 20 Degree CHIRP Transducer 8-Pin f/Garmin [B75C-20-H-8G]
B75 High 20 Degree CHIRP Transducer 8-Pin for GarminAirmar’s Broadband/CHIRP transducers represent the next generation of technology that will allow fishermen to unlock secrets in fishfinding. Echosounder operation away from the traditional 50 kHz and 200 kHz has proven that different fish species return better signals at various frequencies. Airmar’s... read more
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Once shipped, items usually arrive within 3–5 business days. If your item or order is large, it may ship via one of our third-party freight carriers, which deliver from semi trucks with lift gates. Freight delivery is much more complicated than standard parcel shipping — you must schedule a drop-off time, be present for the delivery, and move items from the curb to your residence, among other differences. Sound stressful? If you prepare in advance with ourguide to freight delivery, it doesn’t have to be.
We strongly encourage reading the entire freight delivery guide, but here’s aquick snapshot of what you need to be ready for when you order a large package:- Your freight carrier will call you to schedule a delivery window of about 4–8 hours
- You’re required to be physically present at the specified delivery location during the scheduled window
- Freight shipments are carried in semi trucks, which have lift gates to assist with unloading
- Freight deliveries are dropped off at the curb and no further — not up the driveway, not the porch, not the garage, and most definitely not the backyard — so it’s on you to transport packages to their intended locatio
- For an easier time hauling items to your home or backyard, arrange for at least 2 helpers to be on standby during your delivery window
- You must sign for the shipment to indicate that you’ve accepted the delivery
Again, we recommend reading our entire breakdown of freight delivery so you can become familiar with the process. Trust us when we say that getting caught off guard with the strict requirements of freight delivery can lead to a whole lot of headaches.
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Return all new, unused, and unassembled items in their original packaging, and we'll give you a full refund minus the cost of the original AND return shipping. Made to order and special order items not applicable for returns.
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B75 High 20 Degree CHIRP Transducer 8-Pin for Garmin
Airmar’s Broadband/CHIRP transducers represent the next generation of technology that will allow fishermen to unlock secrets in fishfinding. Echosounder operation away from the traditional 50 kHz and 200 kHz has proven that different fish species return better signals at various frequencies. Airmar’s Broadband Transducers are capable of operating over a wide (or “Broad”) frequency band ranging from 25 kHz to 60 kHz and from 130 kHz to 210 kHz.
Traditional fishfinders transmit a pulse at a single frequency (50 kHz or 200 kHz), which is often referred to as a “tone burst”. Better deep-water and bottom detection is obtained by transmitting a longer pulse, because the fishfinder is delivering more energy to the transducer. However, the drawback of a long pulse is that it provides reduced target resolution. For example, if a fishfinder transmits a pulse that is 500 microseconds in duration, it has a pulse length of 0.7 m (2.4’). With a tone burst, no targets can be resolved that are closer to one another than the pulse length. Fish less than 0.7 m (2.4’) apart, or less than 0.7 m (2.4’) from the bottom, can not be detected. Fish schools will appear in this case as a single large mass, while fish close to the bottom will appear attached to the sea bed and will be difficult or impossible to detect.
With CHIRP, the transmission pulses are typically very long and may start at 40 kHz and end at 60 kHz. By comparing the shape of the stored transmission pulse with the received echoes from the transducer, it is possible to find echoes in the noise and precisely determine their range with astounding accuracy.
Using CHIRP, it is now possible to obtain:
- Much greater range because very long pulses can be used.
- Much better resolution because the sonar pulse is swept across a frequency band (from 40 kHz to 60 kHz, for example).
- Enables targets to be precisely located within inches on the display using pattern-matching techniques.
- Closely spaced fish and fish lying on the bottom can be accurately detected and displayed as distinct targets.
Because weak fish and bottom echoes can be resolved within the noise (the ‘snow’ on a conventional fishfinder display), it is possible both to detect targets at far greater depths than before and track the bottom at higher boat speeds.
Features:
- 12 m (40’) cable
- Depth and fast-response water-temperature sensor
- Same elements and performance as the B765LH/LM offered in a low-profile housing
- Bronze transducer housing
- Boat Size: Up to 8 m (25’)
- Hull Type: Fiberglass or wood
Need More Help?
Our expert can help guide you through
your purchase.
or send us an email
B75 High 20 Degree CHIRP Transducer 8-Pin for Garmin
Airmar’s Broadband/CHIRP transducers represent the next generation of technology that will allow fishermen to unlock secrets in fishfinding. Echosounder operation away from the traditional 50 kHz and 200 kHz has proven that different fish species return better signals at various frequencies. Airmar’s Broadband Transducers are capable of operating over a wide (or “Broad”) frequency band ranging from 25 kHz to 60 kHz and from 130 kHz to 210 kHz.
Traditional fishfinders transmit a pulse at a single frequency (50 kHz or 200 kHz), which is often referred to as a “tone burst”. Better deep-water and bottom detection is obtained by transmitting a longer pulse, because the fishfinder is delivering more energy to the transducer. However, the drawback of a long pulse is that it provides reduced target resolution. For example, if a fishfinder transmits a pulse that is 500 microseconds in duration, it has a pulse length of 0.7 m (2.4’). With a tone burst, no targets can be resolved that are closer to one another than the pulse length. Fish less than 0.7 m (2.4’) apart, or less than 0.7 m (2.4’) from the bottom, can not be detected. Fish schools will appear in this case as a single large mass, while fish close to the bottom will appear attached to the sea bed and will be difficult or impossible to detect.
With CHIRP, the transmission pulses are typically very long and may start at 40 kHz and end at 60 kHz. By comparing the shape of the stored transmission pulse with the received echoes from the transducer, it is possible to find echoes in the noise and precisely determine their range with astounding accuracy.
Using CHIRP, it is now possible to obtain:
- Much greater range because very long pulses can be used.
- Much better resolution because the sonar pulse is swept across a frequency band (from 40 kHz to 60 kHz, for example).
- Enables targets to be precisely located within inches on the display using pattern-matching techniques.
- Closely spaced fish and fish lying on the bottom can be accurately detected and displayed as distinct targets.
Because weak fish and bottom echoes can be resolved within the noise (the ‘snow’ on a conventional fishfinder display), it is possible both to detect targets at far greater depths than before and track the bottom at higher boat speeds.
Features:
- 12 m (40’) cable
- Depth and fast-response water-temperature sensor
- Same elements and performance as the B765LH/LM offered in a low-profile housing
- Bronze transducer housing
- Boat Size: Up to 8 m (25’)
- Hull Type: Fiberglass or wood
Need More Help?
Our expert can help guide you through
your purchase.
or send us an email
About the Manufacturer
Manufacturer's Name Airmar
Founded in 1982 by Stephen Boucher, Airmar is a family owned and operated manufacturing company in Milford, New Hampshire. With over 30 years of experience, Airmar has become synonymous with world-class acoustic sensing technology. Our first product introduction was a transom mounted transducer for fish-finders. Today, Airmar develops and manufactures transducers for a diverse range of applications, including air-ranging industrial transducers, underwater scientific and survey transducers, weather sensing instruments and our extensive line of fish-finding transducers, headlined by our latest wide-beam Chirp products.
