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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?
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)...
http://i477.photobucket.com/albums/r...B/45c336a5.jpg
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...)
http://i477.photobucket.com/albums/r...reenshots1.jpg
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...
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?Quote:
Originally Posted by Cane Pole
HECTOBEL..... wasnt that the creepy guy in Silence of the Lambs?Quote:
Originally Posted by Cane Pole