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[rathikrishna]

Hay..friends...can we use toy remotes on our crafts..?..will it work with model boats...?..and once ired an article, that some freequencies never work over water...is it true..?

[Shipmate60]

Rathi
Only 2.4 Gig wont work UNDER the water as the signals bounce off the water not penetrate so cant be used in submarines.

Bob

[Pirate]

Many toy radios do not transmit very far (some no further than 3 meters) add to this that the frequencies used are rather mixed. We have laws that states any r/c for air is 35 MHz, any land based is 27 MHz and water is 27 or 40MHz with the new broader spectrum of 2.4 ghz for any land/air or water. Toy manufacturers are not always so exact and even when declaring a definite wave lengh for example 27MHz Brown, you may find that the transmitter may interfere with another user on either side of this designated frequency. BUT if you have no law or are out of its jurisdiction and there are no other r/c users nearby then use toy radios, with there limitations. Occasionally you will find a toy radio that is very well built to a high standard and performs very well. Not knowingyour circumstances I relate this in hope that it helps you.
Regards
Pirate

[tigertiger]

Toy RC is usually 27 MHz.
But these radios are not very powerful. They have a range of about 20 meters.

The standard RC transmitters are much more powerful. If anyone is using a standard 27 MHz transmitter anywhere near the toy RC, the toy RC signal will be jammed.
This means that no signal will get to the toy and it will stop working. If you use the toy grade RC in any boat, that boat will also stop working.

How do I know?
In the past I have stopped every toy in our local pond from working, because I was sailing my boat with a standard RC set.

[malcolmfrary]

Often, the toy RC responds to the entire band, so it doesn't matter what particular frequency the set claims to be, it will get swamped by anything broadcasting on that band.  Very occasionally, a toy transmitter at very short range and with a nice new battery, will interfere with a hobby grade setup.
As long as the aerials are above water, all the bands work.  Signal strength and thus range are reduced when underwater, more so in salt water, and the GHz frequencies just don't penetrate water at all.

[rathikrishna]

Ohhh...its too complicated...thank you all...i wasnt thinking about all criteria....thank you all for the valuable advices...but..i got an rc helicopter from a scrapyard..its rc is based on 35 Mhz.i tested its antena out in my oscilloscope..it shows a carrier wave about the same freeq mentioned over it..but when i operates any of the cont sticks, a new wave is appearing within the main carrier freeq..it works around a 150 meters.thats why i asked...and i do not know any mandatory about using radios in my country...so i have to ask some authority, of my ham radio officials. thanks you all...