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Chirp Transducer band question regarding ideal frequency for target specie

Old 06-17-2015, 02:00 PM
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Default Chirp Transducer band question regarding ideal frequency for target specie

Hi guys

Lets imagine i only fish for squid.
The ideal sonar frequency to target squid is 133KHz.
This frequency usualy is in mid chirp transducer.

But lets say i fish between 40 to 70 feet of water.

Will i get better results with a high band chirp transducer?

I believe that the high band for this depth will have more detail, but it will that detail overcome the ideal frequency or it will be best only in the bottom return?

Last edited by Jorinho; 06-18-2015 at 09:51 AM.
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Old 06-18-2015, 09:58 AM
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Ok

I'll develop my question a little bit more.

I'm about to buy a Garmin 7410XSV (equal as the 7610XSV) with a GT51M-TM transducer.

I fish for squid from 40 to 70 feet.

I fish for other fishes from 60 to 180 feet.

Some rare times I fish in 250 to 300 feet.

Some times i troll for marlin.

The GT51M-TM transducer as a chirp 2d element that covers 80-160KHz.

My question is will I improve in adding a Airmar TM185-H or HW taking in consideration that my usual target species are better detected around 130KHz and tuna or marlin in 60 to 80KHz.

Marlin or tuna is not my priority for now, so no need for a low band chirp.

The High chirp in the TM185-H or HW will improve my target species return or it will improve the bottom detail only?
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Old 06-18-2015, 12:07 PM
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Originally Posted by Jorinho View Post
O
The High chirp in the TM185-H or HW will improve my target species return or it will improve the bottom detail only?
The wide the cone the less bottom detail.
The HW is more sensitive to targets then the H..but with less bottom detail in some cases.


First window on the left..H second window the HW..3rd windo the H...4th window the HW



First window the H..second the HW
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Old 06-18-2015, 01:54 PM
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Ok semper

So if i want to detect more fish instead off having more bottom detail i should choose the HW.

Regarding the ideal frequency to target fish, will i have more results with a TM185-HW over a GT51M-TM even if the starting frequency of the TM185-HW starts above the ideal frequency of the target fish specie?

I hope i made myself clear!

Thanks
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Old 06-18-2015, 02:48 PM
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Originally Posted by Jorinho View Post
Ok semper

So if i want to detect more fish instead off having more bottom detail i should choose the HW.

Regarding the ideal frequency to target fish, will i have more results with a TM185-HW over a GT51M-TM even if the starting frequency of the TM185-HW starts above the ideal frequency of the target fish specie?

I hope i made myself clear!

Thanks

By concentrating on the frequency only you are missing the more important parameter....transducers sensitivity.

The TM185C-HW , TM185C-H have far greater sensitivity to the return target signal as compared to the 2D traditional element of the GT51.
It is the transducers sensitivity to the targets that is the key.

For example..
Using a transitional B60 as the benchmark:

The B75 H has 20 times the roundtrip sensitivity of the B60.
The B175 H has 150 times the roundtrip sensitivity of the B60.


http://www.airmartechnology.com/uplo...chures/B75.pdf
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Old 06-18-2015, 03:10 PM
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Thanks semper

So i'll be fine with a Garmin 7410xsv with a Garmin GT51M-TH and a Airmar TM185-HW for my fishing purposes, right?!!!
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Old 06-18-2015, 03:27 PM
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Originally Posted by Jorinho View Post
Thanks semper

So i'll be fine with a Garmin 7410xsv with a Garmin GT51M-TH and a Airmar TM185-HW for my fishing purposes, right?!!!
No..
You also need bait!


PM sent.
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Old 06-18-2015, 03:43 PM
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I prefer the wide beam 200kz transducers and have no issue with marking squid in Socal in depths to 120 feet.

Only issue I have marking squid is on 50khz.
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