Author Topic: CHIRP specs?  (Read 366 times)

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Offline felvic

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CHIRP specs?
« on: October 29, 2017, 11:10:34 AM »
Hello,

I'm looking desespertly for the specs of the Helix 7 SI GPS transducer XNT 9 SI 180 T.

Specially performance regarding the dB.

Thanks for help ;)
« Last Edit: October 29, 2017, 12:34:26 PM by felvic »
François - Montpellier - France


Offline rnvinc

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Re: CHIRP specs?
« Reply #1 on: October 29, 2017, 05:22:57 PM »
Basic specs are listed on the HB website for the included XNT 9 SI 180 T for the Helix 7 SI GPS  ...

https://www.humminbird.com/Products/HELIX-7-SI-GPS/

What other specs are you referring to  ...??

Are you meaning specs for the G1, G2, or G2N  ...??

Rickie
« Last Edit: October 29, 2017, 06:51:16 PM by rnvinc »

Offline felvic

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Re: CHIRP specs?
« Reply #2 on: October 29, 2017, 11:23:15 PM »
Basic specs are listed on the HB website for the included XNT 9 SI 180 T for the Helix 7 SI GPS  ...

https://www.humminbird.com/Products/HELIX-7-SI-GPS/

What other specs are you referring to  ...??

Are you meaning specs for the G1, G2, or G2N  ...??

On the fishfinder specs, looks like probably unit CHIRP specs:

Standard Sonar Coverage:20°, 60° & (2) 85° @ -10db (Total of 180°)

We may suppose -10 dB is for 200,83 and 455 Khz frequencies.

But what about the transducer ?
François - Montpellier - France

Offline rnvinc

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Re: CHIRP specs?
« Reply #3 on: October 30, 2017, 06:06:17 PM »
The specs listed are the only criteria HB releases on the xducer  ... Fixed frequency beam angles at -10db  and CHIRP frequency sweep range in CHIRP capable models ...

"Q" factor is not released info  ...

What other specs are you specifically looking for  ...??

Rickie


Offline felvic

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Re: CHIRP specs?
« Reply #4 on: October 30, 2017, 11:49:27 PM »
T
What other specs are you specifically looking for  ...??


dB at different frequenzies, like on Airmar transducers:

http://www.airmartechnology.com/uploads/installguide/airmar%20technical%20data%20catalog.pdf

François - Montpellier - France

Offline rnvinc

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Re: CHIRP specs?
« Reply #5 on: October 31, 2017, 06:26:52 PM »
dB at different frequenzies, like on Airmar transducers:

http://www.airmartechnology.com/uploads/installguide/airmar%20technical%20data%20catalog.pdf




HB chooses to measure all their piezo beam angles at -10db for advertising purposes  ...

Beam former shape by piezo design is proprietary and not released info by HB  ...

Rickie

Offline felvic

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Re: CHIRP specs?
« Reply #6 on: November 01, 2017, 12:07:08 AM »
HB chooses to measure all their piezo beam angles at -10db for advertising purposes  ...

Beam former shape by piezo design is proprietary and not released info by HB  ...


I understand, but this is unit frequencies not transducer frequencies...
François - Montpellier - France

Offline rnvinc

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Re: CHIRP specs?
« Reply #7 on: November 01, 2017, 08:11:38 PM »
I guess I'm not understanding your question  ...

-db is a factor of decreased sound pulse strength  ... pertaining to how the sound pulse is measured as it travels out and away from the xducer (to determine advertised beam angle specs)  ...

Are you looking for the CHIRP transmit sweep frequency ranges  ...??

Rickie
« Last Edit: November 01, 2017, 08:14:18 PM by rnvinc »

Offline felvic

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Re: CHIRP specs?
« Reply #8 on: November 02, 2017, 02:59:01 AM »
Are you looking for the CHIRP transmit sweep frequency ranges  ...??


Sorry, may be my english is too poor.

I'm just looking for the transducer specs, like on Airmar TM150M specs: http://www.airmartechnology.com/uploads/techdata/95-155a.pdf

Thanks
François - Montpellier - France

Offline rnvinc

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Re: CHIRP specs?
« Reply #9 on: November 02, 2017, 07:02:56 PM »
Sorry, may be my english is too poor.

I'm just looking for the transducer specs, like on Airmar TM150M specs: http://www.airmartechnology.com/uploads/techdata/95-155a.pdf

Thanks


Those type of specs are not released by HB  ...

The only specs released are  ...:

*Beam angles of the fixed frequencies measured at -10db  ...
*CHIRP sweep frequency ranges (no beam angles released for CHIRP)  ...
*Power output RMS  ...
*Power output Peak to peak  ...
*Depth capabilities  ...

I also wish HB would release more data relating to their xducers  ...

Rickie



« Last Edit: November 02, 2017, 07:04:07 PM by rnvinc »

Offline felvic

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Re: CHIRP specs?
« Reply #10 on: November 03, 2017, 12:02:31 AM »
Those type of specs are not released by HB  ...

The only specs released are  ...:

*Beam angles of the fixed frequencies measured at -10db  ...
*CHIRP sweep frequency ranges (no beam angles released for CHIRP)  ...
*Power output RMS  ...
*Power output Peak to peak  ...
*Depth capabilities  ...

I also wish HB would release more data relating to their xducers  ...

Rickie





Thanks!
François - Montpellier - France


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