Airmar Transducer Technical Presentation

8/12/2019 Airmar Transducer Technical Presentation

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Transducer Technology


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OVERVIEW

Broadband TransducersWide beam TransducersTilted Element TransducersTransducer performance photosNMEA 2000 ProductsTransducer Installation & Troubleshooting


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Transducer Specifications

Power Q

Quality Factor

TVR(dB) RVR(dB) FOM

B744V 600W 28 @50kHz31 @200kHz

155@50kHz164@200kHz

-174@50kHz-184@200kHz

-31@50kHz-21@200kHz

B260 1kW 8 @50kHz8 @200kHz

162@50kHz175@200kHz

-173@50kHz-183@200kHz

-14@50kHz-10@200kHz

R199 2kW 3 @50kHz2 @200kHz

167@50kHz177@200kHz

-174@50kHz-182@200kHz

-9@50kHz-6@200kHz

R209 2-3kW

2 @50kHz2 @200kHz

171@50kHz172@200kHz

-177@50kHz-184@200kHz

-7@50kHz-12@200kHz


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Non-Broadband 200kHz-Matching layer B260

Q=8 Impedance 377

Non-Broadband 200kHz-NO Matching layer B260Q=26 Impedance 132

200kHz Ceramic Performance

Overlay


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Broadband B260Q= 8 Impedance 90 Overlay

Non-Broadband 200kHz-NO Matching layer B260Q=26 Impedance 132


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Echo Waveforms

Transducer: P319Frequency: 200 kHzQ=31 Cycles: 35

Transducer: B260Frequency: 200 kHzQ=8 Cycles: 10

Transducer: R99Frequency: 200 kHzQ=2 Cycles: 10


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Fish 6 above blendsinto bottom echo by

long ring from high Q

Fish 6 above blendsinto bottom echo by

long ring from high Q

Shows fish as blobs Fish less than 6 above bottom will blend in

Individual fish are detectedFish are detected 1 above the bottom

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4-10

-8

-6

-4

-2

0

2

4

6

8

10

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4

-10

-8

-6

-4

-2

0

2

4

6

8

10

time, milliseconds

Broadband vs. No Broadband

Fish 1 above thebottom is still

detected by shor tring from low Q

Fish 1 above thebottom is still

detected by shortring from low Q

Individual fishblend together Individual fishblend together Individual fishare separated

Individual fishare separated

Short Ring- Low Q Long ring- High Q


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Compare depth measurement performance:

- changes in input power- change transducer (use different FOMs)

- active sonar equation predicts the trend


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0 200 400 600 800 1000 1200 1400 1600Depth, m

50 kHz B260 transducer, Received Voltage vs Bottom range

+6 dB +3 dB 0 dB, B260 1kW -3 dB -6 dB -9 dB-12 dB-15 dB-18 dB-21 dB

5 Vrms (-106 dBV) det. thresh.

808 m

Signal too weak

( 4 dB dashed line ) R e

l a t i v e

l e v e

l , d B

10

30

50

70

90

4

Must be above this line toobtain a good measurement

R99, R209

B260

B258, SS270W

B164

B744V, B60

50kHz Range Data


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0 100 200 300 400 500 600 700 800Depth, m

200 kHz B260 transducer, Received Voltage vs Bottom range

+6 dB +3 dB 0 dB, B260 1kW -3 dB -6 dB -9 dB-12 dB-15 dB-18 dB-21 dB

5 Vrms (-106 dBV) det. thresh.

Signal too weak

200kHz Range Data

407 m

R e

l a t i v e

l e v e

l , d B

10

0

20

30

40

50

60

70

80

90

4Must be above this line toobtain a good measurement

R99R209

B164

B744V, B60

SS270W

B258


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Broadband = Less voltage needed to drive transducer

B260 Non-Broadband:

(1000 RMS Watts x 8 x 300 ) = 1,549 Volts

B260 broadband:

(1000 RMS Watts x 8 x 90 ) = 849 Volts


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Individual fish

below & alongside baitfish

Individual fish

below & alongside baitfish

Individual fishholding tight

to bottom

Individual fishholding tight

to bottom


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Broadband Transducer

Non-Broadband Transducer


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Low ring=

Excellent Shallow-water operation


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SS270WTwin 25 beams @ 50 and 200kHz


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User Benefits Excellent at detecting mid to shallow water fish(bait, tuna, marlin etc.)

Split screen 50/200kHz fishfinder display ismore intuitive for novice users

Same targets appear in both beams Advanced users can identify fish species


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SS270W-Same bottom imaging @ both frequencies


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Wide vs. narrow beam-

Ping pong ballsSS270W SS270WB260 B260

50kHz 200kHz

SS270W B260 SS270W

200kHz


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SS270W @ 35 MPH


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Frequency agility allows the user to adjust thefrequency if the connected echosounder is"tunable".

No loss of sensitivity across the frequency range Adjusting the frequency will change the beam

width and depth capabilities. Certain fish are more detectable at specificfrequencies so the fishfinder & transducer can betuned to get the best echo return for the species

being targeted (tuna, marlin, ground fish, bait).

Benefits of Tunable Fishfinders withBroadband Transducers


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Broadband R209 / R299Q=2

Broadband B260Q=8 Overlay


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R209 External Mount / R299 In-Hull

Broadband on both low and high frequencies. 24 low-frequency ceramics that can operate anywhere

between 33kHz to 60kHz and can handle up to 3 kW of

input power. High-frequency 3.5" single-ceramic can operate between

130kHz to 210 kHz and can handle up to 2 kW of inputpower.

R309 and R399 units operate between 25kHz to 45kHz and130kHz to 210 kHz.


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Broadband and the future: CHIRP

Improved signal-to-noise ratio

Very good performance from shallow to deepBetter target definitionBetter performance at speedVariable beamwidthsBetter rejection of noise sources

-Frequency Modulated Transmissions


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B164 1 kW Tilted Element Engineered for Center console

and sport fishing boats

50/200kHz :constructed of threedual frequency elements. Low-profile design leaves no

protrusion below the hull No High Performance fairing

required

Built-in temp sensor


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SS270W Wide BeamTilted Element Pair

SS270W split up into 2 transducers Same ceramics and performance as the SS270W Separate transducers for 50 kHz and 200 kHz Top of the line 1kW tilted element Engineered for Center console and trailered boats Transducers can be sold separately No High Performance Fairing needed Built-in temp sensor


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SS270W TiltedElement Pair

Wiring


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200kHz Wide / Narrowbeam Switch box

Allows SS270W 200kHz to workwith existing B260 / M260installations.

User now has a switchable200kHz wide or narrow beamfor the specific type of fishing.


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SS260 Narrow BeamTilted Element Pair

B260 split up into 2 transducers Same ceramics and performance as the B260 Separate transducers for 50 kHz and 200 kHz Top of the line 1kW tilted element Engineered for Center console and trailered boats Transducers can be sold separately No High Performance Fairing needed Built-in temp sensor


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Transducer performance photos

600W B744V 1kW B164 1kW B258

1kW B260 1kW M260

Garmin GSD22 Raymarine DSM300 Furuno FCV585


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R199 In-Hull Signal Loss

50kHz

No Fiberglass

Q = 3

50kHz

inch Fiberglass

Q = 4.1


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200kHz

No Fiberglass

Q = 2

R199 In-Hull Signal Loss

200kHz

inch Fiberglass

Q = 4.5


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NMEA 0183 and 2000 Smart Transducers

All processing is done inside the transducer Operates at 235kHz No interference with on-board sounder Perfect for displaying digital depth/speed/temperature

DT800- Retractable Tilted Element Thru-Hull Depth / Temperature DST800- Retractable Thru-Hull Depth / Speed /Temperature P39- Transom Mount Depth / Speed /Temperature P79- In-Hull Depth only

T42- High performance Temperature

Installation & Troubleshooting


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Installation & Troubleshooting

Basics: Mounting Location

The water flowing across the hull must be smooth with aminimum of bubbles and turbulence (especially at high speeds).DO NOT MOUNT near water intake or dischargeopenings or behind strakes, fittings, or hull irregularities. The transducer must be continuously immersed in water. The transducer beam must be unobstructed by the keel or propellershaft(s). Choose a location away from interference caused by power andradiation sources such as: the propeller(s) and shaft(s), othermachinery, other echosounders, and other cables. The lower the noise

level, the higher the echosounder gain setting that can be used. Choose a location with a minimum deadrise angle. Choose an accessible spot inside the vessel with adequate headroomfor the height of the housing, tightening the nuts, and removing theinsert.


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Thru-hull location selection

Transducer placementTransducer placement

should be aft andshould be aft andclose to theclose to thecenterline. It needs tocenterline. It needs to

be located lowbe located lowenough that theenough that thetransducer is in thetransducer is in thewater at all times.water at all times.


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Thru-Hull Mounting Location

Consider itemsConsider items

such as the liftingsuch as the liftingstrap placementstrap placement ininthe location asthe location as

well as trailerwell as trailerbunks and rollersbunks and rollersif it is a traileredif it is a traileredvessel.vessel.


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Thru-hull location selection

Be sure that theBe sure that thetransducer signal willtransducer signal willnot intersect the propnot intersect the propshaft(s), keel or anyshaft(s), keel or anyother hull projections,other hull projections,

and that it is notand that it is notdirectly indirectly in -- line with theline with theprop(s).prop(s).


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Thru hulls can beThru hulls can beused on steppedused on steppedhull vessels, buthull vessels, butthey must bethey must be

located ahead of thelocated ahead of thetrailing edge of thetrailing edge of thefirst step and low tofirst step and low tothe keel to operatethe keel to operate

well.well.BOWBOW

Thru-hull location on stepped hulls


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M260 and R199 In-Hull Tanks

Now shipped with flat 90 tank bottom which can beeasily cut for bow-stern or port-starboard mounting.

To fill the new tank, we recommend using non-toxicpropylene glycol (RV / Marine anti-freeze).

To mount the tank to the hull, we recommend usingfiberglass resin, Marine Tex or Fusor 100EZ / T10.


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As with thruAs with thru -- hulls,hulls,The selectedThe selectedlocation should belocation should beaft and close toaft and close tothe centerline sothe centerline so

that the hull belowthat the hull belowthe transducer isthe transducer isin the water at allin the water at all

times.times.

In-hull location selection


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Testing for depth function

Using an EDI transducerUsing an EDI transducer

test box you cantest box you candetermine the resonantdetermine the resonantfrequency of afrequency of atransducer and confirmtransducer and confirmthat it is operatingthat it is operatingproperlyproperly

Black lead from transducerBlack lead from transducertester attaches to blacktester attaches to blackAirmar wire(Airmar wire( -- depth)depth)

Red lead from transducerRed lead from transducertester attaches to bluetester attaches to blue

Airmar wire(+depth)Airmar wire(+depth)


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Testing for Temperature Red lead from ohm meterRed lead from ohm meterattaches to brown Airmarattaches to brown Airmarwire.wire.

Black lead from ohmBlack lead from ohmmeter attaches to whitemeter attaches to whiteAirmar wire.Airmar wire.

With meter set to OHMS theWith meter set to OHMS the

reading should be in thereading should be in the10,000 ohm range at 7710,000 ohm range at 77degrees F.degrees F.The resistance increases asThe resistance increases asthe temp decreases.the temp decreases.The sensor will readThe sensor will readcorrectly in or out of water.correctly in or out of water.

Testing for Speed


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Testing for Speed

Apply Negative batteryvoltage to Airmar barewire and attach black

lead from volt meterApply positiveBattery voltage toAirmar red wire

Attach red leadfrom volt meter toAirmar green wire

Turn the paddlewheel slowly by hand. The voltmeter should toggle between zero volts and the

input voltage with each quarter turn of rotation.

Id tif i I t f


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Identifying Interference

If the screen interference increasesproportional to vessel speed thisusually indicates that the transducerface is exposed to aerated water

If the interference appears at a specificrpm this could be a sign of electricalinterference on the sounders powerline. Try powering the sounder directlyfrom a stand-alone battery.


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Identifying flow noise


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y g

Perform a slow but constant turn tothe side of the hull that the transom

transducer is mounted. Graduallyincrease rate of turn. If screen imageimproves the transducer needs to be

mounted lower in the water. If screen image is worse when turning

to the same side as the transducer tryturning the opposite direction. Thiswould indicate the transducer needs to

be mounted higher in the water.


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Airmar Transducer Technical Presentation

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