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Old Feb 14, 2015, 11:41 PM
DLL
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Joined Feb 2015
5 Posts
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Underwater Crawler

Well a project I have always wanted to make is a FPV underwater car/crawler. So instead of swimming through the water it will be crawling on the bottom.
I really have no clue how im going to water proof it, but im sure there's away.
I will probably have to make a thread in the car/crawler section to find a good frame. Because I don't want to buy a $200 crawler to just replace all the stuff in it. So this will probably be a scratch build.

The main thing I need help with is what is a good transmitter/receiver? So far I have only found 75 MHz that can go through water and is legal. And how far will that get me, range wise??
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Old Feb 15, 2015, 12:22 PM
Submarines, etc.
tsenecal's Avatar
Arvada, Colorado
Joined May 2005
1,636 Posts
75mhz will penetrate 5 inches to 15 feet depending on what is in the water besides water (chlorine, salt, etc)
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Old Feb 15, 2015, 01:23 PM
DLL
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Joined Feb 2015
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Pure freshwater but the lake is high in iron............
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Old Feb 17, 2015, 04:02 PM
Registered User
Germany, NRW, Dusseldorf
Joined Sep 2012
13 Posts
That range is just for steering. No way you will get a video signal out -75 MHz is not fast enough. freek
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Old Feb 20, 2015, 12:33 PM
Build'em and Crash'em
Ken Lapointe's Avatar
Narragansett, RI
Joined Oct 2000
3,409 Posts
You could always connect a floating bobbin that carries an antenna to the surface
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