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Have you been switching to the LOW power mode?... from 400 watts to 200 watts in less than 20 fow?Found it on this youtube vid.http://www.youtube.com/watch?v=6AofSohfGwk
Do you have any friends with a vex so you could try either a single or dual-beam ducer on the 22?I think all the ducers are interchangeable ?
It sounds like a shortcut and it's like a full scale zoom of 20' cut in half. I thought the 10' was going to be the base for the unit, not a double magnification of the 20' setting. What's the initial dead zone in the 20' setting? Is it still about 2-3' feet of dead zone?
Try going to Vexilars website. THey have a forum there. I'm sure one of their pros can get you in the right direction. Youll usually get a response very quick.
I know the purpose of the FL-22 was to use 10 foot increments so the entire screen would be visible for that depth. I can see by the pics that the zero mark extends over 1/4 of the screen. What hapens or what does it look like in 20 feet of water? Does it go back to the top? At exaclty what depth does it do it? Just in the ten foot setting?
Have you tried it on a different body of water?
I just think it could be murky or full of plankton, something. Might be worth trying it in a 5gal bucket of tap water. I would definitely try it in some sort of clear water jut to eliminate the possibility of that being an issue. Is there noise from another sonar? It doesn't usually look like that, but you never know.
Is your transducer set to far under the ice? It could be a reflected signal bouncing back down? I'd try lifting and lowering it while running to see if it improves.
From what I've heard from other users, the FL18 has less of a initial dead zone than the FL20. Not sure what gives.
Just a few easy things to try, good luck. Let us know how you make out.