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My home made RC Submarine

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  • #16
    No way to convert a GHz radio to mhz as far as I know, sorry...

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    • #17
      Unless you are are better then average with electronics, I'd steer away from a used unit from Ebay-Bob's radio is one of the best deals for a 6 channel MHZ radio ($79!!) .
      Last edited by Bob Gato; 12-21-2019, 12:52 PM.

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      • #18
        Hi, and thanks for you suggestion. The transmitter is not expensive, but adding the receiver will make it a little expensive. Plus I had a, dare a say, brilliante idea, well more accurately, I found RC sub already using that principle, using a float connected to the sub via a wire, and the float will have the antenna on it, so no radio problems anymore. I need a piece of advice: If I want to extend the antenna by a wire, can I use any type of electric wire, or does an antenna requiert a specific type of wire (coaxial....). I am planning to solder a 2m50 long wire to the base of the antenna on the receiver (I am lucky because my rc receiver has 2 antennas, so if I fail this, their will be another antenna: redundancy..). Thank in advance for you help!

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        • #19
          You need to insulate any antenna extension by using coaxial cable. Standard cable will not work.

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          • #20
            ah thanks, this is precisely the point I was wondering about. What would you suggest I buy as coaxial antenna? Any diameter required ( for about 2 to 3 meters long antenna), any other technical specification I must be aware of before buying coaxial cable (type, diameter... ?), I know nothing about it. Thank in advance, very helpful information, Best

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            • #21
              Originally posted by SubHuman View Post
              You need to insulate any antenna extension by using coaxial cable. Standard cable will not work.
              Can you tell me if " this https://www.aliexpress.com/item/3282...chweb201603_53 " coaxial would do the trick please? Need any-further information? Thanks a lot!
              Attached Files

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              • #22
                Sorry batter late then never.
                all in Japanese but you get the idea.

                I see you are using meter and a "," not '.' , so some where in Europe, switch to a used 40 MHz system, just to make things easier.


                 

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                • #23
                  Yes correct, France! Well spotted. And thank you, I am still waiting for the delivery of my coaxial cable, hope it will do the trick and be souple enough. We shall see...I will keep you posted ! Best,
                  William

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                  • #24
                    Hi again! And just to update you and also to ask for advise maybe... I have been fitting the "antenna on a float". I have bought a coaxial cable, 5 meters long, and "connected" one end to the sub (via a 3 pin RC type plug, using the middle red cable for antenna cable, and the other two exterior cables for the "parasite coaxial cable". (hope the terms a understandable.)... And it ..... DOESN"T WORK!!! If we consider the soldering was done properly (very delicate) can it be the exterior antenna part, in the water bottle floating on the water that is not picking up the signal? Any need to solder the inner part of the coaxial cable (hence the antenna wire) to a straight stick of metal (To simulate an antenna)? Any suggestions.... ? Best to all and thanks in advance... advancing slowly but surely... ;)

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                    • #25
                      Oh and what about a 35MHz radio control???? I have one... any chance under water? well you know what I mean I am not suggesting to use it underwater.. 35MHz would go through water?

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                      • #26
                        35MHz will travel through water and into your WTC.
                        If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

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                        • #27
                          Lets see if I have this right-you have a 5 meter coax cable soldered to your receiver where the old antenna was. Then it terminates in a floating water bottle. Then you asked about a straight stick of metal for an antenna. So you just have the coax with nothing on it? the shielding of the coax blocks all the signal and keeps it traveling to the end where there should be , yes, an antenna-EXACTLY the same size as the antenna that came off of the receiver.Also 5 meters might be too long to allow this to work. I also think the RCA plug will let water short out the signal from the center pin-IT MUST be watertight.There are more details that might cause failure but those are the big ones.

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                          • #28
                            Great ! Thanks for all these precious informations! I might go for the 35MHz! But FIRST if I just have to make a few adjustments I will continu trying the float! So about your advice: the 3 pin plug is not in the water it is in the dry sub. In the water passes the coax cable fully waterproof. I will dismantle the float (bottle) to add an solid antenna to the central cable! (How should I do this properly?) should I remove insulation from the coax cable? (Should i uncover both the antenna wire and the parasite wire!?) or just the antenna wire? Then can I solder it to a solid metal antenna? ( and finally the length of that antenna: you say the same as the existing receiver antenna: it is itself a coax with 2 lengths: one long length with both antenna and parasite coax, and the end of it is just the antenna without the surrounding coax! Which length should I measure!?). Thanks a lot that is all great info to me! Very best!

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                            • #29
                              Any kind of metal type or shape for a efficient antenna?

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                              • #30
                                This guy explains it the best so here's a link: https://forum.rc-sub.com/forum/gener...r-c-submarines Also note that its the second post in "Tips and Tricks" on this forum...you might want to check the rest of them out.

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