Author Topic: Helix 7 depths over 100m  (Read 416 times)

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Offline MarjanK

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Helix 7 depths over 100m
« on: August 13, 2018, 11:42:04 PM »
I come from Slovenia, so I'm already sorry for the language. ::)

I fish in the Adriatic Sea to a depth of about 100m.
I currently have Helix 7 Chirp DI G2 with XNT 9 DI T transducer. I'm disappointed with the display at depths of more than 80m especially displaying details and fish. I'm not hunting straight tuna, I'm interested in fish weighing about 1kg or less.

Does anyone have experience on these depths with Helix 7?

I'm thinking about options:
- purchase XNT 9 DB 74 T transducer (50/200) or something similar (suggestions are desirable)
- buying Helix 9 ... but I'm not sure that the new HELIX 9 CHIRP DI GPS G2N with the same XNT 9 DI T (comes in a package) will work better at the depths of 100-120 m than my current Helix7 with same XNT 9 DI T transducer?

Suggestions, Opinions, Experiences?

... I also have a 898c with own transducer and when both are switched on there are disturbances. Even if one is on 83hz and the other on 200hz. Is this normal or is something wrong with the settings?

Thanks!

at
« Last Edit: August 14, 2018, 12:00:47 AM by MarjanK »


Offline rnvinc

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Re: Helix 7 depths over 100m
« Reply #1 on: August 14, 2018, 06:38:25 PM »
Your depths are stretching the limits of high frequency imaging technology  ... Sound attenuation (absorbed into water) is more prevalent in higher frequencies  ...

The XNT 9 DB 74 T is Dual Beam 2d only - you would lose DI capability with this xducer  ... But the lower 50kHz band would perform better at deeper depths for 2d  ...(If the HELIX 7 even has a Connected Transducer option for this xducer)  ...
------

HELIX 9 MEGA CHIRP DI comes with the XM 9 MDI T Low "Q" xducer  ... Same DI as XNT 9 DI T - but better 2d because of the Low "Q" factor in the 2d piezo  ... While it is still the CHIRP bands around the 83/200kHz  2d frequencies - it has potential in somewhat deeper water by being able to increase Sensitivity without capturing as much noise (also due to the Low "Q")  ...
-----

All HB units transmit 200kHz for digital depth regardless of Menu settings or view displayed - you are experiencing Crosstalk interference from 2 separate units transmitting 200kHz at the same time  ...

Rickie

« Last Edit: August 14, 2018, 06:41:21 PM by rnvinc »

Offline MarjanK

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  • Accessories: GPS receiver
Re: Helix 7 depths over 100m
« Reply #2 on: August 15, 2018, 10:30:54 PM »
Rickie, Thanks for the answer

So what would be your suggestion:

Upgrade Helix 7 with new XNT 9 DB 74 T transducer (50/200) or something similar (suggestion)...or
Buy the new Helix 9 (with the transducer that comes in the package)

Thanks,
Marjan

Offline rnvinc

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Re: Helix 7 depths over 100m
« Reply #3 on: August 16, 2018, 06:44:39 PM »
Rickie, Thanks for the answer

So what would be your suggestion:

Upgrade Helix 7 with new XNT 9 DB 74 T transducer (50/200) or something similar (suggestion)...or
Buy the new Helix 9 (with the transducer that comes in the package)

Thanks,
Marjan


I think you would get better results with the MEGA DI unit that comes stock with the XM 9 MDI T with Low "Q" xducer  ...

The processor should also be better in the 9" or larger units  ... (And larger screen)  ...

Rickie

Offline MarjanK

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  • Accessories: GPS receiver
Re: Helix 7 depths over 100m
« Reply #4 on: August 16, 2018, 09:31:14 PM »
Ok, I'm also inclined to buy 9 ... but are you sure that Helih 9 comes with  transducer XM 9 MDI T?

On Humminbird's specifications it says that it is complete with XNT 9 DI T? (the same as for Helix 7)

https://humminbird.johnsonoutdoors.com/fish-finders/helix/helix-9-chirp-di-gps-g2n


Offline rnvinc

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Re: Helix 7 depths over 100m
« Reply #5 on: August 17, 2018, 08:01:49 PM »
Ok, I'm also inclined to buy 9 ... but are you sure that Helih 9 comes with  transducer XM 9 MDI T?

On Humminbird's specifications it says that it is complete with XNT 9 DI T? (the same as for Helix 7)

https://humminbird.johnsonoutdoors.com/fish-finders/helix/helix-9-chirp-di-gps-g2n


There are 2 models of HELIX CHIRP DI G2N (in 9", 10", and 12" screen sizes)

You listed the HELIX 9 CHIRP DI GPS G2N  ... (It does indeed come with the XNT 9 DI T)  ...

Here is the HELIX 9 CHIRP MEGA DI GPS G2N  ... (It comes with the XM 9 MDI T Dual Spectrum Low "Q")  ...
https://humminbird.johnsonoutdoors.com/fish-finders/helix/helix-9-chirp-mega-di-gps-g2n

Rickie
« Last Edit: August 17, 2018, 08:04:35 PM by rnvinc »


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