Clicking Sonar transducer

[Mike k]

Just fitted an Airmar P79 in hull transducer and connected it to my Navman Trackfish 6600- transducer fitted precisely to instructions but on turning on the navman a slow click is initially heard but no depth or trace THEN when the trace starts to appear on the screen a very fast tommy gun type clicking starts which is audible even when the engine hatch is shut- never did this with the previous transducer- so do the panel think this is acceptable or will it burn out the transducer? Been told its ok by supplier but wanted to hear others views

When I changed the pulse length to 'Long' on the head unit it seemed to stop doing it but I am not sure what a long pulse length means in terms of efficiency of transducer etc

Any advice appreciated

regards

Mike

 

[omega2]

What fluid have got in the well? and is the boat in the water! If hand held and in free air they do make the noise you describe

 

[elton]

I don't think it's cause for concern. I had an old ultrasonic TV remote that emitted a loud sequence of short clicks, though not audible to everyone. Increasing the pulse width will reduce the spatial resolution, ie smaller fish and detritus will be invisible.

 

[Mike k]

What fluid have got in the well? and is the boat in the water! If hand held and in free air they do make the noise you describe

thanks Omega its 71 ml of Propylene Glycol and boat in water

 

[Mike k]

I don't think it's cause for concern. I had an old ultrasonic TV remote that emitted a loud sequence of short clicks, though not audible to everyone. Increasing the pulse width will reduce the spatial resolution, ie smaller fish and detritus will be invisible.

thanks Elton when you say pulse width is that the same as 'long' pulse as my unit offers Auto,short ,medium and Long- clicks rapidly on all but Long?

 

[elton]

thanks Elton when you say pulse width is that the same as 'long' pulse as my unit offers Auto,short ,medium and Long- clicks rapidly on all but Long?

It sends out a pulse of (ultra)sound, varying in duration (pulse width). Short pulses will detect smaller objects than long pulses, so Long will effectively filter out floating debris and small fish. How small is determined by the duration. If you set it to "short", I'd expect it to display a lot of visual "noise".

 

[Mike k]

It sends out a pulse of (ultra)sound, varying in duration (pulse width). Short pulses will detect smaller objects than long pulses, so Long will effectively filter out floating debris and small fish. How small is determined by the duration. If you set it to "short", I'd expect it to display a lot of visual "noise".

thanks Elton

 

[omega2]

We have the same transducer fitted, well filled with baby oil, I think I recall making sure that the tranny does not make contact with the hull.

 

[Mike k]

We have the same transducer fitted, well filled with baby oil, I think I recall making sure that the tranny does not make contact with the hull.

thanks yes the recommended amount just makes sure that it covers the transducer element when you drop it into the well and the outer case that you screw it onto holds it clear of the hull. Do you get that noise and how did you prepare the hull?

 

[Falling Star]

I fitted one and added baby oil. It worked no trouble at all. Then fitted one to my current boat in the same way and it refused to function until I changed the baby oil to KY Jelly.

 

[omega2]

No noise as such, have 3 in the same area, you can "feel" the pulses though our old girl is solid glass, so just sanded a smooth bit and stuck with sikoflex. We are running Garmin, Koden and Raytheon, not at the same time though! LOL

 

[Mike k]

No noise as such, have 3 in the same area, you can "feel" the pulses though our old girl is solid glass, so just sanded a smooth bit and stuck with sikoflex. We are running Garmin, Koden and Raytheon, not at the same time though! LOL

Thanks Omega sounds like i will have to have a fiddle with settings some more.

 

[omega2]

http://www.airmartechnology.com/uploads/installguide/17-217-01.pdf

I assume you read this? take note of sandwich hulls, what boat you got?

 

[henryf]

It refused to function until I changed the baby oil to KY Jelly.

I nominate this for post of the year 2015



Henry

 

[Mike k]

http://www.airmartechnology.com/uploads/installguide/17-217-01.pdf

I assume you read this? take note of sandwich hulls, what boat you got?

Thanks Omega, yeah I was pretty meticulous about the fitting and used a silicone for the mount and Propylene Glycol for the liquid

Mounted between old through hull ( white) and speed transducer on the deadrise so would assume its not sandwich at that point

View from underneath

On this boat Quicksilver 750

cheers

Mike

 

[omega2]

What you could try is the bag of water trick, and try different bits/places of the hull, you seem to have lot going on in that area, and most manufacturers suggest a spot about 2/3rds back from the bow in a position were a smooth flow of water can be expected.