What is TVG?? (Time Variable Gain Explained!)

In this video I explain what Time Variable Gain is (TVG) and how it effects your sonar picture!
A lot of people will tell you to set it at "Low" or "Off", but not many people can explain WHY!
There's not a ton of information out there to explain this vaguely covered topic, so I found as much as I could and tried to make sense of it. Different brands of fish finders might calculate TVG a little bit differently or have more customization on how to adjust it, but in the end, they all produce similar results.
I want to add this disclaimer: The information presented in this video is MY interpretation of the vague info I could find online. That said, it makes sense to me, and I think it's pretty accurate.
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[@QuietWildernessFishing]

Anything I can do to make fish look bigger I am all for. 😁 Great explain Jeff 🤘

[@jeffdicks]

Haha aren't we all!

[@thegreatlakesfisherman]

Great video! Companies that produce these units do a poor job of explaining their features. Very helpful!

[@jeffdicks]

Thanks so much! It is a shame that great companies like Garmin missed the mark when it comes to documentation on this in particular

[@InstinctBassin]

This was great

[@8DeereFarm]

Great explanation with very helpful animations. Thanks for helping clear this up!

[@jeffdicks]

I'm super glad you found it informative!

[@markjungdahl3054]

Excellent. I finally understand TVG.

[@jeffdicks]

I'm glad I could help you get it!

[@MarcinKantor]

Very good man, thank you

[@jeffdicks]

Thanks so much! I'm happy you got some value out of this one!

[@toilatheanh6497]

meaningful explanation! thank u so m!

[@jeffdicks]

I'm so glad you found it helpful!

[@Ryanbarbosaoutdoors]

Huge help!

[@jeffdicks]

I'm glad you liked the video!

[@Brad-id7ge]

Does tvg work the same with chirp?

[@jeffdicks]

Now thats a good question and I don't know the answer. In theory I can't see why it would work any different. All CHIRP does is use multiple frequencies within a certain range to draw the image on your screen, so my guess is that yes, it would work the same with CHIRP.

[@jhoskins4913]

Awesome says a RF tech, thx

[@jeffdicks]

Thanks so much! I'm happy to hear from someone who would have much more experience in that field than I approve of the video! I have quite a bit of RF experience, but it's not from a marine point of view, but I guess RF is RF is RF!