Thank you, Snips. I usually troll for surface-oriented fish (Sailfish, Marlin, Dorado) in 200m of water, but occasionally need to read the bottom very well at 700 m (2100 ft) to locate unchartered sea mounts. The SS270W is performing the first task well but beyond 500 m I get no digital depth measurement and by fine tuning DFF1 a lot, beyond 600m I can barely see a faint line at the bottom in the middle of a lot of clutter.
Would the DFF1-UHD with a B275LH-W be a whole lot better, on balance? Would a B265LH be a better choice ( balancing the two tasks )? I did notice that in Low, the beamwidth of the two is the same, so I thought the 275 might do as well in the very deep application as the 265? :questions
You may remember this previous thread (last two entries only ), on page 2:
Re: Somewhat disappointing DFF1 performance (NOT ANYMORE)
Postby southatlantic » Fri Dec 06, 2013 1:24 pm
Snips,
I finally made it back to really deep water (600 m - 720 m). At that depth, I could not get a digital readout and no real image (other than clutter) on the screen. After fiddling a lot with the controls that I think I understand :think , the best results came with the settings below. I will try to post a picture in the very next post. This allowed me to just see the bottom and at least try to find an elevation of about 120m that should be there, but no detail at all.
Here were my settings:
Trolling speed (8 its)
LF (the HF screen was blank)
Picture advance : ½
Clutter 67%
TVG 5 or 6
Bottom level LF : +13 (anything lower and the digital readout appeared, but showing a much lower depth
Any suggestions?
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Re: Somewhat disappointing DFF1 performance (NOT ANYMORE)
Postby Snips » Sat Dec 07, 2013 10:23 am
Southatlantic,
You are approaching the depth limits of the DFF1/SS270W combination. Changing the TVG settings will only affect the gain in the upper portion of the water column. Other than making sure your output power is set at 10 there is not much more I can suggest. I would like to see a screen shot when you have one.
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