Low frequency target strength

[Anonymous]

From what I've read, targets usually should have a stronger return with low frequency as well as better arches due to cone angle. I have a 1870 with a p66 and was fishing the other day and did well on the yellowtail (30lb). I ran my machine in dual frequency, and had much better returns on the high frequency side, i was expecting stronger returns and maybe arches on the low frequency. Is it due to using a 600w transducer with such a wide angle, and not enough power on target?

Lf gain about 53
Hf gain about 75
Clutter 10%
Color erase 20%
Very low tvg
1/1 speed.

Thanks

 

[Snips]

Hberit,
Thank you for your screen shot and settings. A couple of things I noticed. One is the amount of surface clutter. I can only imagine you lowered the TVG to help suppress the amount you were seeing. A lower TVG setting means you will need to have a higher gain setting which you have. This surface clutter will deaden a sounders over all sensitivity, specially on 50Khz. If you look at the bottom return of 50Khz you can see that it is not that strong. If you don't have a strong bottom return all the mid water column targets are going to be weak. Next time out I would recommend going back to the middle TVG setting. Also notice the correlation between the amount of surface clutter to the strength of your bottom and mid water targets.

Snips