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HDS-7 Incorrect depth reading

Old 10-06-2011, 09:51 PM
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Default HDS-7 Incorrect depth reading

First time installing the device myself.

50/200 kHz transducer...

The boat is out of the water on a work rack, and once I finished installing the unit I power it up. The unit is reading 8ft, in reality the transducer is abt 2ft away from the ground. The transducer is parallel to ground

Does it make a difference in & out of the water? does the unit need to be calibrated?

I want to make sure it is installed correctly before putting the boat in the water.

Also, I noticed the transducer makes a "tic tic tic tic tic" noise, is this normal?

thanks in advance for any help
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Old 10-07-2011, 12:11 AM
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The hds has a selection on it to adjust the depth for calibration. The ticking is normal but it is not advised to run it while out of the water. Good luck. Read your manual.
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Old 10-07-2011, 01:36 AM
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Originally Posted by JoseG View Post
First time installing the device myself.

Does it make a difference in & out of the water? does the unit need to be calibrated?
Yes, of course, it does make difference out of the water. The echosounder measures the time between transmitting the sound and receiving its echo. Sound travels through the water at about 4,800 feet per second, while the speed of sound travels in air around four times slower than the water. To calculate the distance to the object, the echosounder multiplies the time elapsed between the sound transmission and the received echo by the speed of sound through water. The echosounder system interprets the result and displays the depth of the water in feet for the user.

Last edited by khalito; 10-07-2011 at 02:04 AM.
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Old 10-07-2011, 05:33 AM
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Thank you guys for all the info!

Khalito, what you explain makes total sense,.....reminds me of Signals & Systems class...

I'll update the thread as soon as it goes in the water.

Originally Posted by khalito View Post
Yes, of course, it does make difference out of the water. The echosounder measures the time between transmitting the sound and receiving its echo. Sound travels through the water at about 4,800 feet per second, while the speed of sound travels in air around four times slower than the water. To calculate the distance to the object, the echosounder multiplies the time elapsed between the sound transmission and the received echo by the speed of sound through water. The echosounder system interprets the result and displays the depth of the water in feet for the user.
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