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12-30-2017, 02:41 PM | #271 | |
Dan MacMahon
Join Date: Jan 2003
Location: Hudson, Fl
Posts: 1,904
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Re: Bottom Finder Pics
Quote:
It only does as well as it does with bottom details due primarily to the quality of the display. You would use a more focused tighter beam 'ducer to show better bottom detail and bottom hardness. Best, Dan
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If you stay in this sport, and really apply yourself , in 10 years you might be the diver you think you are today. Smart people realize they know very little. Stupid people think they know everything. |
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12-30-2017, 03:14 PM | #272 | |
Registered User
Join Date: Oct 2007
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Re: Bottom Finder Pics
Quote:
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12-30-2017, 04:03 PM | #273 | |
Naval gazer extraordinair
Join Date: Jan 2003
Posts: 42,214
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Re: Bottom Finder Pics
Quote:
Color me confused but as of my current understanding, bottom finder freqs are in the range of 50/200 KHz, approximately. "1k"? is that 1 kHz or did you mean 1000kHz? I can't find search hits on either. Maybe you super secret dive guys are beyond my reproach? Not trying to be an ass, just trying to understand. Tech shit like this is what keeps me awake at night.
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“If the natural tendencies of mankind are so bad that it is not safe to permit people to be free, how is it that the tendencies of these organizers are always good? Do not the legislators and their appointed agents also belong to the human race? Or do they believe that they themselves are made of a finer clay than the rest of mankind?” ― Frederic Bastiat, The Law |
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12-30-2017, 04:59 PM | #274 |
Seafood Sifu
Join Date: Oct 2002
Location: Jax Fla
Age: 60
Posts: 3,808
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Re: Bottom Finder Pics
Marcus,1k watt.Power, not freq.
Another benefit of more power is using less gain. Dan and Kmoose get huge props for helping people with sonar.
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12-30-2017, 05:06 PM | #275 | |
Naval gazer extraordinair
Join Date: Jan 2003
Posts: 42,214
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Re: Bottom Finder Pics
Quote:
That makes sense...understood. Illuminating the different densities always seemed important to me. Of course, when you're traveling, that isn't the best settings, from my limited understandings, you're just looking for something to dive on. After finding something, you can then hone in on the quarry.
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“If the natural tendencies of mankind are so bad that it is not safe to permit people to be free, how is it that the tendencies of these organizers are always good? Do not the legislators and their appointed agents also belong to the human race? Or do they believe that they themselves are made of a finer clay than the rest of mankind?” ― Frederic Bastiat, The Law Last edited by Marcus; 12-30-2017 at 05:21 PM. |
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12-30-2017, 05:28 PM | #276 |
Dan MacMahon
Join Date: Jan 2003
Location: Hudson, Fl
Posts: 1,904
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Re: Bottom Finder Pics
Tony's right. 1KW power (1000 Watts RMS).
Most older transducers transmitted at either 50khz (LF) or 200khz (HF). New style 'ducers including Chirp 'ducers can transmit much lower and/or higher. I run a 200khz traditional 'ducer with a 6 degree cone on a 1KW Koden bottom machine. A narrow cone like my 6 degree gives a tightly focused detail laden picture on my machine. Shows great detail in bottom structure and bottom hardness. But, this comes with a price because the 6 degree cone only covers roughly 10.8% of your water depth. (.6x180). So basically in 100 feet of water, you get about 11 feet of bottom coverage at maximum depth. Or 5.5 feet on each side of the 'ducer. This is a great tool for diving as it allows you to accurately "pin down" a hard small spot with great accuracy My other 'ducer is a chirp 1KW with a fixed 25 degree cone displayed on a Garmin 12" xsv screen(the one in the above picture). Using the same math as above, this would give you about a 45% coverage of your water depth. So in that same 100' of water, you'd get about 45 feet of bottom coverage. In 300 feet, you'd get 33 feet of coverage on the 6 degree and 135 feet of coverage with the 25 degree. I use the 25 degree to primarily look for fish show (and to a lesser extent bottom structure) outside what the effective range of the 6 degree can show. It's common for the 25 degree to show desirable results when the 6 degree is blank. You then just tighten 'er up with the 6 degree and you're there. This doesn't mean everyone should buy a 25 degree 'ducer. It covers so much area that the details will never be as sharp and good as a tighter degree 'ducer. And on a lower quality (less pixels) screen with a lesser processor, a 25 degree can look like a pac man screen. You can't run them both on the same frequency due to interference, but no worries as the chirp unit can be set on a single frequency of your choosing. Just set it 10-15 khz away from your fixed frequency unit and all should be good. A 25 degree 'ducer isn't a good fit for all but for the right job, it's an invaluable tool.
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If you stay in this sport, and really apply yourself , in 10 years you might be the diver you think you are today. Smart people realize they know very little. Stupid people think they know everything. |
12-31-2017, 09:03 AM | #277 |
Dan MacMahon
Join Date: Jan 2003
Location: Hudson, Fl
Posts: 1,904
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Re: Bottom Finder Pics
Thought these examples might be helpful...
This is the coverage with a 6 degree 'ducer
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If you stay in this sport, and really apply yourself , in 10 years you might be the diver you think you are today. Smart people realize they know very little. Stupid people think they know everything. |
12-31-2017, 09:04 AM | #278 |
Dan MacMahon
Join Date: Jan 2003
Location: Hudson, Fl
Posts: 1,904
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Re: Bottom Finder Pics
And this is the coverage from a 25 degree 'ducer
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If you stay in this sport, and really apply yourself , in 10 years you might be the diver you think you are today. Smart people realize they know very little. Stupid people think they know everything. |
01-22-2018, 07:15 AM | #279 |
Dan MacMahon
Join Date: Jan 2003
Location: Hudson, Fl
Posts: 1,904
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Re: Bottom Finder Pics
Pic from the shallow MG a few days ago. Check out the water temp!
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If you stay in this sport, and really apply yourself , in 10 years you might be the diver you think you are today. Smart people realize they know very little. Stupid people think they know everything. |
01-22-2018, 10:12 AM | #280 |
Registered User
Join Date: Oct 2007
Location: Pensacola Fl
Posts: 512
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Re: Bottom Finder Pics
You are still only seeing what is below the boat not the complete area of the cone. You will see the fish or wreck that is off the bottom under the transducer. But nothing out to the sides. You will see out to the sides with the newer side view machines.
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01-22-2018, 02:13 PM | #281 |
Naval gazer extraordinair
Join Date: Jan 2003
Posts: 42,214
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Re: Bottom Finder Pics
Did ya'll dive it? What was the show comprised of?
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“If the natural tendencies of mankind are so bad that it is not safe to permit people to be free, how is it that the tendencies of these organizers are always good? Do not the legislators and their appointed agents also belong to the human race? Or do they believe that they themselves are made of a finer clay than the rest of mankind?” ― Frederic Bastiat, The Law |
01-22-2018, 04:28 PM | #282 |
Dan MacMahon
Join Date: Jan 2003
Location: Hudson, Fl
Posts: 1,904
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Re: Bottom Finder Pics
Mostly Red Snapper with a few Gags and AJ's.
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If you stay in this sport, and really apply yourself , in 10 years you might be the diver you think you are today. Smart people realize they know very little. Stupid people think they know everything. |
01-22-2018, 08:12 PM | #283 |
Naval gazer extraordinair
Join Date: Jan 2003
Posts: 42,214
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Re: Bottom Finder Pics
Thanks. That makes sense. Was the Snapper for the taking? If so, any good sized ones?
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“If the natural tendencies of mankind are so bad that it is not safe to permit people to be free, how is it that the tendencies of these organizers are always good? Do not the legislators and their appointed agents also belong to the human race? Or do they believe that they themselves are made of a finer clay than the rest of mankind?” ― Frederic Bastiat, The Law |
01-23-2018, 07:57 AM | #284 |
Registered User
Join Date: Feb 2003
Location: st. petersburg,fl.
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Re: Bottom Finder Pics
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01-23-2018, 08:31 PM | #285 |
Team Headhunter
Join Date: Jan 2003
Location: Slowcala, FL
Age: 59
Posts: 4,074
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Re: Bottom Finder Pics
A wider degree cone blends the entire bottom detail the full width of the cone. The narrower the cone the better the detail. Yes, you do see everything in the cone to its full extent. Deeper the water the wider the cone as it is relative to the angle.
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