WMJ Marine

Anchor & Docking
Boating Accessories
Cabin/ Galley/ Deck
Electrical Supply
Engine Parts
Fish Finder
Fishing & WaterSport
GPS & Chartplotter
Marine Radar
Navigation Tool
Outdoor Gears
Plumbing & Pump
Steering & Control
Trolling Motor
Factory Refurbished
Rebate of Month
WMJ Marine Blog

Shopping Cart
How to Order
Contact Us
FAQ & Return
Privacy Policy
Company Info
Site Map
Send me more info
Product Tutorials
Manufacturer Links
Link to Us
Government Order

Sign Up for Newsletter

WMJ Marine
How to Order Shopping CartContact Us Shipping Info International Order
Marine Product Guides > Fish Finder Guides >

What is CHIRP Sounder?

What is CHIRP all about?

Benefits of CHIRP sounders:

Standard, non-CHIRP Fish Finders operate at one or two individual frequencies and are generally capable of detecting targets and displaying them only within those narrow frequency bands. CHIRP Fish Finders transmit pulses across a wide range of frequencies, allowing superior digital signal processing (DSP) to display fish and structure targets with unparalleled clarity, accuracy and resolution.

Typical Non-CHIRP Fish Finders operate with a maximum duty cycle of 1%  - meaning they transmit a voltage to the transducer no more than 1% of the time. Consequently the transmit pulse can be high power but very short duration, limiting the total energy that is transmitted into the water column.

The CHIRP Fish Finders  uses a precise sweep pattern across frequencies within a long-duration transmission. The equivalent sound energy transmitted into the water is 10 to 1,000 times greater than a conventional Fish Finder, resulting in more energy on target. The results are up to 5x greater resolution and depth capability than comparably powered, standard Fish Finders due to the advanced signal processing of the return echo.

When used with a compatible CHIRP transducer (sold separately), it displays crystal-clear sonar images to help find the next hidden fishing spot, ship wreckage or diving location. With our Spread-Spectrum technology, you can see target separation and resolution at extraordinary depths, and dial into specific frequencies to target certain species of sport fish. Bottom contours are more visible, and signal noise can be suppressed at greater depths to provide a more timely interpretation of what’s below for safer navigation and better fishing.


What are the benefits of Airmar's Broadband Transducers?


Airmar offers "True Broadband" Transducers that can operate at a "broad band" of frequencies, not just the traditional 50kHz and 200kHz frequency selections of traditional fishfinders. See the image below that explains this.


Airmar achieves superior results by using a unique ceramic
material. It lets transducers operate over a broad range of
frequencies while maintaining sensitivity. These Broadband
Transducers are, by definition, low-Q devices (refer to “Q”
paragraph). In other words, they exhibit very low ringing.
There is little variation from transducer to transducer.
Additionally, Broadband Transducers are relatively immune
to the effects of aging, so their frequency range remains
stable over time.

Airmar is the first to introduce affordable Broadband
Transducers. This is an enabling technology that provides
better fish detection today and will lead to dramatic
advances in echosounder performance in the future. While
these transducers are more costly to manufacture, the
present and future benefits are huge.
Broadband Transducers enhance fish detection on virtually
all of today’s fishfinders. They give better definition; it is far
easier to distinguish among individual fish and between fish
and the bottom.

Broadband Benefits Today
Manufacturers now market echosounders that can adjust
operating frequency and power output. While these are
premium products, the designs are a precursor of things to
come. With the ability to adjust frequency, an echosounder
can operate Airmar’s broadband ceramics anywhere in
the frequency band. By selecting different operating
frequencies, two or more sounders can work simultaneously
without interference. The frequency can also be adjusted to
the mission. Lowering the operations frequency increases
the beamwidth and depth capability; raising the frequency
narrows the beamwidth, increases echo definition, and
improves high-speed performance.

Broadband Future Benefits
Here is where it gets really exciting. In today’s fishfinders,
good fish detection is obtained by transmitting a long
pulse. This puts more energy on the target. With a long
pulse, closely-spaced fish cannot be separated—you get a
big blob. Fish close to the bottom appear attached to the
bottom and are difficult or impossible to detect.
Airmar’s broadband transducers enable frequency
modulated (FM) transmissions; a.k.a. CHIRPor coded
transmissions. Using FM transmissions, you can achieve both
the benefits of long pulse, more energy on target, and short
pulse, segregation of closely-spaced fish and identification of
fish on or close to the bottom. This is because the coding of
the transmission is known and the return echoes are similarly
coded. The technique is also known as pulse compression.
In summary, fishfinders of the future with FM transmissions
will have dramatically improved target resolution and
signal-to-noise ratio. Airmar’s broadband transducer
technology will enable this to happen.

A Transducer’s quality factor, or “Q” describes the amount
of ringing the ceramic element or elements undergo when
power is applied to the transducer. Think of a church bell
analogy—as the bell is struck it vibrates rapidly and then the
vibration will eventually stop until the bell is struck again.
Most competitor’s recreational transducers have an average
Q between 25 and 35. Airmar Q values range from 1 to 30,
depending on models. The lower the “Q” number the less
ringing in the transducer and the better the performance.
Less ringing greatly improves individual fish separation along
with bottom imaging in rapidly changing water depths such
as ledges and offshore canyons.


Are there any special concerns for installing CHIRPtransducers?

Due to the nature of CHIRPtechnology, CHIRPtransducers generate more heat than traditional tone burst transducers operating at distinct frequencies. CHIRPtransducers require heat sinks in their construction to dissipate this heat. Airmar's CHIRPtransducers have been designed to be installed in specific ways according to the number and placement of these heat sinks. To install a CHIRPtransducer in a way other than intended by the manufacturer would lead to the transducer overheating and could result in transducer failure.

External thru-hull mount transducers must be installed as external thru-hulls. They can not be flush mounted or keel mounted or pocket mounted or fiberglassed into the hull in any way. If you wish to mount a transducer this way, be advised that Airmar makes equivalent transducers with extra heat sinks that are appropriate to be installed this way. See the Pocket/Keel Mount CHIRPbrochure available for viewing on Airmar's home page by clicking the link near the bottom of the page or click the link below.

Airmar's CHIRPtransducer brochure 



**The price is subject to change at anytime without any notice.  We are not responsible for any typographical errors.  Any products can be cancelled from sale at any time.

** All Products sold here are Brand New unless specified Otherwise and come with Full Manufacturer's Warranty



Dear Customer. We are proud to serve you with any assistance via email ask@wmjmarine.com or
Toll free number at
1-877-330-9758 for USA or (858) 720-0776 for International Customers.
Fax: 501-631-4759


Customer Rating

Top Rated

We offer online shipment tracking


VeriSign Trust Seal
256-bit Encryption Shopping Cart

All personal information submitted is encrypted and 100% secure


Authorized Reseller
Garmin Autopilot
Garmin GPS Chartplotter
Garmin Fishfinder
Garmin Radar

Authorized Reseller
Raymarine Autopilot
Raymarine GPS Chartplotter
Raymarine Fishfinder
Raymarine Radar


Authorized Reseller
Simrad Autopilot
Simrad GPS Chartplotter
Simrad Fishfinder
Simrad Radar

Authorized Reseller
Lowrance Autopilot
Lowrance GPS Chartplotter
Lowrance Fishfinder
Lowrance Radar

Authorized Reseller

Furuno Autopilot
Furuno GPS Chartplotter
Furuno Fishfinder
Furuno Radar

Authorized Reseller
Humminbird GPS Chartplotter
Humminbird Fishfinder
Authorized Reseller
Marine Satellite TV
Marine Internet
JRC Fishfinder
JRC Radar
Search Light
Personal Beacon

Marine Autopilot
Satellite Compass
Marine Stereo
Authorized Reseller
Mounted VHF Radio
Handheld VHF Radio
Marine Satellite TV
Marine Internet
Bow Thruster
Sail Winches

Trolling Motors
Trolling Motors

Authorized Reseller

Authorized Reseller
Radar Mount
Battery Charger
Inverter Charger
Authorized Reseller
B&G utopilot
B&G PS Chartplotter
B&G Instrument


Blue Sea System
Distribution Panel
Battery Charger

Seastar Teleflex
Boat Steering
Engine Control
Power Assist
Marine Chart

Marine Chart

Sitex Autopilot
Sitex GPS Chartplotter
Sitex Fishfinder

Sitex Radar

Thermal Camera

Authorized Reseller
Battery Charger
Inverter Charger

Underwater Light

Underwater Light


Shadow Caster
Underwater Light

Underwater Light

Underwater Light

Battery Charger
Inverter Charger

Battery Charger
Inverter Charger
DC Converter
DC Power Supply


Water Pump
Marine Toilet
Authorized Reseller
Battery Charger
Inverter Charger
Marine Toilet
Water Heater
Waste Treatment




Recommended Site: WMJ Marine at Facebook   |  WMJ Marine at Linkedin  |  WMJ Marine at Twitter | Marine Electronics Store

Thank you for visiting WMJ marine for your Boating Equipment and Marine Electronics

Home | Anchor & Docking | Autopilot | Boating Accessories | Cabin/ Galley/ Deck | Communication | Electrical Supply | Electronics | Engine Parts | Fish Finder | Fishing & WaterSport | GPS & Chartplotter | Instrument | Lighting | Marine Radar | Navigation Tool | Outdoor Gears | Plumbing & Pump | Safety | Steering & Control | Trolling Motor | Factory Refurbished | Specials | Rebate of Month | WMJ Marine Blog
Our Company Policy | Privacy Policy | Shopping Cart

Marine Supply Specialist, USA - WMJ Marine Corporation

Copy Right: WMJ Marine Corporation 2004-2019