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Thread: Sonar coverage of 16°, 28°, 45°, & 75° @ -10dB

  1. 03-13-2014, 05:14 PM #1
    dandomo1
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    Default Sonar coverage of 16°, 28°, 45°, & 75° @ -10dB


    I just purchased the Humminbird 859ci Hd Di Combo and it comes with the Sonar frequencies of 455/800/200/455 kHz with Sonar coverage of 16°, 28°, 45°, & 75° @ -10dB

    I notice a lot of the other fish finders come with 200/83 khz at 20° & 60°.

    What's the Difference?
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  2. 03-13-2014, 06:09 PM #2
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    Here is the beams for the HB DI units...(this is for the stock XNT 9 DI T xducer that comes with the HB DI units)...



    The beams for the optional XTM 9 WIDE DI 20 T would have 83kHz/200kHz 2d and 455kHz/800kHz DI...(I don't have a complete depiction of all 4 beams together for the XTM 9 WIDE DI 20 T ... the depiction below shows the shapes of the 83kHz/200kHz 2d - the DI beams would be the same as in the 1st depiction above...)



    Basically the 83kHz/200kHz 2d has wider coverage 2d beams...(the DI beams are the same in both xducers)...

    The optional XTM 9 WIDE DI 20 T only works with the larger 800/900/1100 series DI units as these units have an extra "Transducer Select" menu choice for 83kHz/200kHz/455kHz/800kHz...
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  3. 03-14-2014, 08:50 PM #3
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    Did you know the -10dB (decibels) equates to -.01 hB (hectobels)? Yep.
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  4. 03-14-2014, 09:06 PM #4
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    Barnacle Bill
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    Quote Originally Posted by Cane Pole View Post
    Did you know the -10dB (decibels) equates to -.01 hB (hectobels)? Yep.
    I've never heard of a hectobel. (my spell checker hasn't either) Is that obscene?
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  5. 03-17-2014, 07:58 PM #5
    Tom 513
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    Quote Originally Posted by Cane Pole View Post
    Did you know the -10dB (decibels) equates to -.01 hB (hectobels)? Yep.
    HECTOBEL..... wasnt that the creepy guy in Silence of the Lambs?
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