Question about Standard Horizon Standard Ff520 Fish Finder Sounder Module

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When we are deep water (500 ft or deeper) the fish finder will display 3.5-10 ft. and won't show the fish or shows tons of fish. Are we able to set the depth that we would like to see eg: if we are fishing down to 250 ft could we set our fishfinder to show that depth? Our model is horizon cp1000. Our manual has no info on our fishfinder. Help

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Im not familiar with your particular unit but you should be using a low frequency transducer for water over 500'; something like a 50 kHz transducer or a dual frequency transducer like a 50/200kHz for detail with the high freq. but increased depth range on the lower frequency. As far as setting it to 250 ft, you should be able to use the range feature and adjust the maximum to 250'. typically the factory default is automatic so it will caonstantly adjust the range based on the maximum current depth.

Posted on May 23, 2011

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Posted on Jan 02, 2017

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My piranhamax 197c wont display fish in a pond? What could be some fixes?


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The Smartcast system uses the wireless version of a simple transducer and thermometer to locate fish, show structure and water temperature. From your description, it sounds like the transducer portion of the Smartcast device has stopped working.
Transducers are both simple and complex, sturdy and delicate. Here is a Science Minute: A fish finder electrical signal is sent to the transducer. The electrical signal to energize the transducer crystal is generated by an amplifier. The energized crystal reverberates at a particular frequency, to convert the electrical signal into mechanical acoustic or sound energy. The acoustic energy or sound waves causes oscillation of the water molecules through which the sound travels. The sound is pulsed out in a defined beam. These do not travel out in a straight line but in a wave pattern. The acoustic pulse travels through the water at a rate of approximately 4800 ft (1500m) per second in saltwater and 4920 ft/sec in fresh water.

The problem is that the crystal in all transducers (permanent mount, thru-hull mount and castable) is delicate. It is a crystal. Unfortunately the warranty on most of these is six months, and unless yours is newer than that, you may need to buy a replacement castable. The handheld unit should still work. While I think the idea of knowing what is "over there" is a good one for shore fishing, I haven't bought these systems because I could never get over the idea that repetitive casting of a crystal, no matter how well-housed, was a good idea. Good luck.

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Sounds like either the sensor is broken or the line going to the monitor is cut or frayed. Its possible you might have to replace the line. Just in case though check to see if the line to the monitor is loose. That might be your problem right there.

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1 Answer

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Hi there.

Ok in WIDE beam mode the cone extends out 45 degrees from the transducer. This covers a fair area, but is best used only in shallow waters as the beam may not have enough power to penetrate deeper waters effectively. 30ft should be fine for WIDE mode however. Using a bit of trigonometry, the beam would extend to a diameter of 60 feet from the center point of the transducer on the sea/river floor.

The beam is a direct beam... It is not a rotational beam from the transducer... i.e. it does not rotate like a radar beam but shoots downward in the cone arc constantly. Imagine a torch being turned on and off very rapidly... The light shoots straight out from the torch in its own cone shape. This is essentially what the transducer does when it shoots out a signal every millisecond or so.

The image you see on the screen is the result of the hole cone of signals, however, the strongest sonar returns occur near the center of the beam. Weaker returns are shown which are located towards the outer edges of the sonar cone where the signal power is less. So if a fish passes right on the edge of the beam, it will only show up as maybe 1 pixel on the sounder screen as it is a weak return on the edge of the sonar cone, whereas if that fish passes under the center of the beam, it will show a larger, more continuous or arched shaped return as the fish moves from the outside of the beam, through the center of the beam, and out to the other edge of the beam under the boat.

Regarding the flasher... I would advise not to use this. It does work by showing a continuous top and bottom reading which displays as constant flashes around the circle readout. Anything it picks up in the beam will show as flashes in between the top and bottom readings. Using the display is far better and with practice allows you to better identify fish and bottom structure readings. Flashers were earlier forms of sonar readouts. Some older folk still like them but I believe the normal display is better for finding and identifying fish and can show structure shape as well (the flasher mode really cannot).

Hope that helps!

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I had the same problem and got the transducer changed. It now works perfectly. That could be the problem you are having... bad transducer.

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