What exactly is chirp? Is it worth the difference in $?
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What exactly is chirp? Is it worth the difference in $?
CHIRP equals a sweep pattern of sound within a long-duration transmit pulse across a frequency range. The sound energy that goes into the water from CHIRP is many times greater than that emitted by traditional sonar. A CHIRP unit simply sends and receives a ton of information.Apr 24, 201
i copied this out of Sport Fishing Magazine for their definition. Alphahawk and Rickie can put it into better terms and might chime in on this. Chirp will give you a better pic on your depth finder than just a normal depth-finders due to,the fact it’s a stronger pulse sent out and back via the transducer. To me, it’s worth the additional cost.
Rickie can quote you the theory......I could too but I quit wrapping my head around it when I retired. Compressed High Intensity Radar Pulse.....except it is being used in sonar. But the name has stuck because it was first used in radars...which was my field. What it means for the end user is target separation.....in the Helix Mega units target separation is 2.5 inches...pretty darn good. In radars it was used so you could pick out multiple planes that might be flying very tight to make it only look like one plane. Those days are long gone.....military and even civilian radars have outstanding target separation......but I will say that the military radars are off the charts in how small a separation they can see. The sonar is putting out a range of pulses within it’s frequency range. Think of it like a bird chirping.....it is singing different frequencies. If you could hear the sonar pulse you would basically hear low notes...high notes....and in between notes in random order. This not only lets you see separate fish but paints a very clear image on the screen. I’ll be the first one to tell you if you can afford a Helix Mega unit then get it. There are other brands that use CHIRP and they are good...so you won’t go wrong if you get one of those units either. Make sure it CHIRPs in the si and di along with the 2d. I rarely use 2d but I do look at it every once in a while. It is most assuredly worth the money. It will save you a bunch of time by eliminating dead water.....and give you an almost picture like display of what is down there.
Regards
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First pic is white bass....2nd pic is a set of Goodyear’s.....LOL......3rd pic is lock discharge at Nickajack Dam......and last pic is an almost empty bluegill bed. Oh and the single fish is what I think is a sturgeon......Tennessee has stocked quite a lot of the over the years trying to get them to come back to the Tennessee River and Cumberland River.
Regards
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Quote:
Originally Posted by cevans
That's about as simple an explanation as I could give ...
More data collected = more data that can be displayed ...
Rickie
Thanks guys.
Multiple frequencies at one time. Def worth it for 2d sonar even in shallow water.
Great pics!! Just a couple of ???: Which model of HB? and are those tires as large as the scale would suggest or is it due to perspective?
My unit is the Humminbird Helix 10 Mega si. I could be wrong.....and maybe Rickie could weigh in on my thoughts....but I think they are tractor tires.....I say that because of the size and the ridges that show up in the shadows that are cast. I have seen a lot of tires with both the Helix 10 Mega si...and my old HB 899 si. These are some big tires....bigger than normal car tires.Quote:
Originally Posted by cache22
Regards
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Great pictures!