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Transducer Power Question

Old 10-01-2011, 09:09 PM
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Default Transducer Power Question

Hello,

I generally fish the bottom in saltwater at depths between 30 and 100 feet. I have a Garmin 740s and I am trying to decide what transducer will be best for my use. Will I get additional clarity from going with the 1kw Transducer over the 600 watt given my shallow depths? How noticeable do you think the difference would be?

Thank you in advance!

James
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Old 10-02-2011, 01:18 AM
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Currently running a 1kw on my Garmin 740s and it does a great job down to about 700'. For 30-100 I would think the 600w would be fine.

v/r Joe
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Old 10-02-2011, 03:24 AM
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Default 30 to 100 ft. 1 kw would be a waste of money for the upgrade.

then you have the size difference on a non shoot through the hull ducer. I am mostly a top water fisherman way off shore. I am starting to see little difference between the two on different boats I am fishing from. We are more concerned about bait near the surface and thermoclines showing up near the surface. So even a 2 KW is not needed most times. Some days we turn the electronics off and troll blind just for something different. We sometimes catch fish anyway?
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Old 10-02-2011, 08:47 AM
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Originally Posted by AquaticGuy View Post
Hello,

I generally fish the bottom at depths between 30 and 100 feet. Will I get additional clarity from going with the 1kw Transducer over the 600 watt given my shallow depths?
Yes, a 1 KW transducer will have greater sensitivity than a 600 watt transducer..and that sensitivity will translate into better target separation and target detection when used with a quality sonar.
A Tm260/ B260/ M260 is 50 times more sensitive than a P66 / B60/ P79.
The key word here is sensitivity....not power. A modern digital sonar will regulate output power depending upon depth.
The 1 KW transducers are multi element (TheTm260 has 8 elements) vs a single element for the 600 watt transducers.

Now... is it worth the added expense to use a $600 to 800. 1 kw transducer over a $120 to $195.. 600w a transducer ?.....In shallow water, very seldom.

Depends upon the fishing conditions and budget of course.
If you are fishing for halibut in 50 to 100' of water absolutely....the 1 kw is the way to go...and even then it is going to be difficult to pick halibut up due to the fact they have no swim bladder.. and they seldom are more than 30" off the sea bed while on the move.

Fishing in 100' to 30' of water in the Gulf etc...a 600 watt will be just fine.

And not all 600 watt transducers are equal.

The P66HP is 20 times more sensitive than a normal P66 .

http://www.thehulltruth.com/marine-e...-lowrance.html

And mounting makes a difference ..the B60 has the same element as the P66 but will have an advantage because a thru the hull mounting is working in cleaner water.


For fishing in the Pacific Northwest and up into Alaska where the water conditions are more severe and some fish species are harder to detect the 1 kw does give an edge and this is transducer of choice for many anglers.
25 degree 1 kw transducers here are very common even on 600 watt sounders both for sensitivity and the wider coverage.

For better water conditions the 600 watt units in 100'-200' or less have shown excellent results and are the go to units for high % of southern and East Coast fishing conditions.

Last edited by semperfifishing; 02-05-2016 at 07:23 AM.
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Old 10-02-2011, 09:26 AM
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Default AirMar B117 any good?

Hello and thank you for the feedback, it has been very helpful! The type of 600 watt I am seeking for fishing the bottom in the Gulf of Mexico between 30-100 feet is the Airmar B117. Is this a more or less sensitive 600 watt unit? How do you tell the sensitivity? It seems to have very similar numbers to a few other Airmar 600 watt transducers. Do you have any experience with the B117 unit?

Thank you,

James
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Old 10-02-2011, 09:34 AM
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[QUOTE=AquaticGuy;4062324 The type of 600 watt I am seeking for fishing the bottom in the Gulf of Mexico between 30-100 feet is the Airmar B117. Is this a more or less sensitive 600 watt unit? How do you tell the sensitivity? It seems to have very similar numbers to a few other Airmar 600 watt transducers. Do you have any experience with the B117 unit?

James[/QUOTE]


Yes, I have tested and used the B117..as well as most Airmar 1 K and 600 watt transducer currently in production.
I regularly run head to head tests of different sonar and transducer configurations.
Great fun!

The B117 has the same element and sonar parameters as the P66, B60 and P79 and all have the same sensitivity.
But the B117 and the B60 may have an edge due to its being mounted in cleaner water .
( If you were fishing in deeper water the P66HP will have the edge due to its 50 kHz side having about 20 times more sensitivity.)

The P66 is a tri-ducer with depth,temp and speed.
The B60 and B117 have depth and temp.
The P79 depth only.

Your cone will be 45/12 degrees

At 30' deep the 45 degree cone will cover a width of 25' across.
At 30' deep the 12 degree cone will cover a width of 6' across.

At 100' deep your 45 degree.........................................83' across.
At 100'....................12........................ ..............................21' across.

So it might be best to stay in the dual mode of operation on your sonar.



The B60 is a tilted element and can accomodate hulls up to 24 degree deadrise.

The B117 is best used in an area of 0 deadrise.

Last edited by semperfifishing; 10-02-2011 at 10:07 AM.
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