295 with ss175hw

[Stabi2750]

Hi team, new member with some question for all the knowledgeable furuno guys and girls.
I’m running the above and have some question please. I don’t wuiet understand the stc can someone explain it? I’m fishing in around 20m of water. Is the higher number of arc stronger or weaker? As the tvg is strongest at 1 and weakest at 8. Should I be adjusting my pulse lenghs? I’m not 100% sure about this feature. Also I find that in water which the current is running fast, when I boost the tvg depth I’m getting less clutter on my screen. Is it a mistake that the tvg depth is as per the depth you are fishing in? I do play around with the clutter and gain however the only way I get a clear screen is boosting the tvg depth to 100m when fishing in 20m of water. I have a berley cage which I throw overboard and retract when I’m in doubt and it picks it up well. My gain is set to 6.8 and clutter around 30%, is that too high you think for snapper around 5kg?

Your help is greatly appreciated

 

[Deep Blue]

Stabi2750,

TVG = “Time Variable Gain”. The TVG function looks at the overall strength of a fish target and reduces the signal strength in shallower water or increases the signal strength in deeper water. With this setting, less is more.

STC stands for “Sensitivity Time Control.” This is a near-range echo suppression control that improves overall clarity by preventing surface clutter from dominating the screen. This is a fish finder processing feature used to reduce the intensity of strong echoes from objects that are very close to the transducer, such as: Surface clutter, Air bubbles or boat turbulence, and very shallow targets. When the sonar pulse is first transmitted, nearby objects reflect a very strong return. Without STC, these strong “near-field” echoes can overwhelm the display and make it difficult to see fish or structure that is farther away.

Pulse length (or pulse duration) on a fish finder is the amount of time each sonar “ping” lasts. It’s usually measured in microseconds (µs) or milliseconds (ms). When your fish finder sends out a sonar pulse, it can be: Short pulse (short duration), or a Long pulse (long duration).
The pulse length affects how the sonar reads the water in resolution, depth capability, and fish target separation.

Shorter Pulse Length: Pros: Better target separation (can distinguish fish close together), Higher detail in shallow water, and clearer definition of structure and smaller fish. Cons: Less energy per ping, resulting in reduced depth penetration

Longer Pulse Length: Pros: More energy sent into the water, with better deep-water performance, Stronger returns from weak or distant targets. Cons: Lower target separation (fish close together may appear as one), Longer Pulse Lengths provide reduced fine detail.

In simple terms:

• Short pulse = higher detail, in shallower water.
• Long pulse = more power, for deeper water.

Tips to reduce clutter: Lower the gain/sensitivity slightly. Use surface clutter/surface filter settings. Turn on the noise rejection / interference filter. Ensure the transducer is mounted properly (solid contact with water, minimal turbulence). Keep any cables separate and all electronics properly grounded.

- Deep Blue