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Old 05-15-2007, 10:20 PM   #1
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Default Testing Sonar on Land?

Getting ready to launch the boat for the 2007 season. Can I power up my Raymarine FF (Airmar 600w Thru Hull Transducer) and test it while still in dry dock without damaging the unit and or the transducer?
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Old 05-15-2007, 10:47 PM   #2
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Default Re: Testing Sonar on Land?

The sonar will not transmit thru air. It needs a liquid interphase. If you get a garbage can of water which will come up to the transducer, or even a large garbage bag, and fill it with water, you can test the transducer. --this is much easier with a transom tranducer, than a thru hull, since it is going to be almost impossiable to get a tight seal against the bottom.
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Old 05-16-2007, 08:27 AM   #3
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Default Re: Testing Sonar on Land?

Thanks. I am aware that the sonar will not transmit thru air. I just installed two Raymarine units with HSB2 and was looking to test the units (Navigation and radar and chartplotting). I am afraid to power up the Sonar unit because I fear that transmiting into the air will damage the unit.
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Old 05-16-2007, 09:18 AM   #4
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Default Re: Testing Sonar on Land?

It should not cause damage to the either the 'ducer or the sounder.

I just installed a B60 on my boat, and turned mine on to test it both in air and water. It made clicking sounds in the air, and I dipped it in a 5 gallon bucket of water to check the temp. functions. The sound changed from a click to a surprisingly loud THUNK! for each pulse. (bucket was on my deck, so maybe it was reverberating.) It was also interesting to see water drops explode off the transducer face with each pulse (after pulling it out of the bucker.
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Old 05-16-2007, 12:02 PM   #5
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Default Re: Testing Sonar on Land?

Quote:
thataway - 5/16/2007 7:47 PM

The sonar will not transmit thru air. ...
Of course sound moves thru air, including the sound of your ff ‘ducer. But at 50khz to 200khz, you will never hear it. You’ll never hear it in the air, you'll never hear it in the water. Absolute ideal human hearing is at between 20hz to 20khz only. Your dog can’t hear it, either. S/he hears up to 22khz(?). And your ff is adjusted to work with the speed of sound in water, not air, so forget any meaningful readings.

Fwiw, there are probably more transducers above supermarket doors, beaming ultra-high freq sound waves thru the air above human hearing range (like your ff) at approaching people to open the doors for them. Such ‘ducers are also used in air in manf’ing for proximity checking of things on automated lines.
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Old 05-18-2007, 10:25 PM   #6
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Default RE: Testing Sonar on Land?

Thanks ...............
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Old 05-19-2007, 09:47 AM   #7
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Default Re: Testing Sonar on Land?

You can not only transmit with the XDCR out of the water, you CAN also hear it (put your ear close to XDCR it will "tick"), and you can sometimes even see the bottom on your machine if you are directly (not at an angle) over a hard deck. The shown depth will be about 2 times the actual depth (height above the ground). Speed of sound in water is approx 4800 ft/sec. Speed of sound in air is approx 1150 ft/sec.
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Old 05-19-2007, 09:57 AM   #8
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Default Re: Testing Sonar on Land?

Quote:
cfinch - 5/19/2007 9:47 AM

you CAN also hear it (put your ear close to XDCR it will "tick"),
Man, just tried it and spent the last two hours getting a burned eardrum looked at by the doctor!
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