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Anybody knows how to increase the walkie talkie range?

Discussion in 'General Electronics Chat' started by buloi123, Sep 30, 2003.

  1. buloi123

    buloi123 New Member

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    Hi, I have bought a pair of talkies and I want to increase its power for longer range. It's range is just 50 meters. I want to increase the range. What should I do?
     
  2. Sebi

    Sebi New Member

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    This is a toy category, very primitive and cheap. Buy another, the modification expensive and hard.
     
  3. Nostrafus

    Nostrafus New Member

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    Well you could always get a really huge antenna for broadcasting, like unscrew the case, and take out the antenna, solder a piece of copper wire to where the antenna was, and the other side to say, a light pole, or a satellite dish, or a car, or anything that is really really big, and made of metal, perhaps piggy backing on a cell phone tower would work.

    I myself decided the best antenna is actually a cars frame, since it's metal, a conductor, and big, which is why the bottom of a car makes a good place for placing bugs, and other kinds of transmitters.
     
  4. dave

    Dave New Member

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  5. olly_k

    olly_k Member

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    A shopping trolley would be a good one - at least it will remain portable!!! :D
     
  6. Nostrafus

    Nostrafus New Member

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    HAHAHAHAHAHA!

    Aiight, well, in all seriousness, I need a bit of info from you first.

    A. Your age
    B. Your average height, and if you can be more specific your torso height
    C. How much you can carry on your shoulders for a comfortable amount of time, I can carry 50 lbs for an indefinate amount of time but that's because I have a lot of back/leg strength working in retail/stocking (I can convert to pounds if you live out of US)

    Because if possible I could get you the general idea of how to make a battlefield long range artillery/air strike radio, the principal is a backpack mounted antenna that has enough conductor space for an antenna booster and a large enough antenna to broadcast roughly one mile in proper conditions (which usually aren't present in a battlefield, but it still works)

    I can't garauntee that it'll work because if you're running off a cheap walkie talkie it may not have to power to use the antenna efficiently.
     
  7. vin92

    vin92 New Member

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    I had a Motolora 2 way FRS/GMRS Radio with a 5 mile range under optimal condition. Its model is FV200. Well in order to increase the range of your radio, you will need to tune the transmitting power of your radio. Mine had a transmitting power of 500mW which is fairly low. I would like to know how to tune the power output of my radio, but very unsure of how to tune it. This picture shows my walkie circuit board and I had found 3 tunning screws on it. It may be very risky as some of the screw is to tune the frequency. I wanna tune the power output. Can someone expert help me in this? Thanks

    [​IMG]
     
  8. mneary

    mneary New Member

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    You have posted a pointer to a picture on your local hard drive. We cannot see it.

    No matter, really. The advice given to the original poster six years ago is still valid.
     
  9. gary350

    gary350 Well-Known Member

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    You can use a Linear amplifer and talk to the person with the other walkie talkie over 100 miles away but he won't be able to talk back to you.
     
  10. ke5frf

    ke5frf New Member

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    What country are you in?

    Typically it is illegal to modify a radio transceiver unless you have a license which permits it.
    Also, the amplifier is most likely adjusted for the gain that is most efficient for its design. If you attempt to increase the gain it may get too hot. The nominal amount of gain that the adjustment may provide is not going to make much difference in your range. Say your range is 300 meters without adjustment. You may stand to gain an extra 25-50 meters. Most of the limitation is within the antenna and not the amplifier. It really isn't worth doing when you consider the possible damage that can occur from overheating the transistor.
     
  11. mbarazeen

    mbarazeen Member

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    since the one you are talking about is only 50m ranged, it may be a very low quality one. if you put amplifier to boost it you will probably suffer from mutipple harmonics and unstable condition and oscillations.
    tuning the existing capacitors will not help you to boost your power, instead they are normally tuned to give maximum out put and when you disturb it you may get you range reduced.
    also you should look into local regualtions before get into boosting it.

    if you provide an external antenna the height of the antenna will boost your range. when you make it 4times your range should increase two times theoritically
     
    Last edited: Dec 26, 2009
  12. vin92

    vin92 New Member

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    I had a Motolora 2 way FRS/GMRS Radio with a 5 mile range under optimal condition. Its model is FV200.

    [​IMG]

    Well in order to increase the range of your radio, you will need to tune the transmitting power of your radio. Mine had a transmitting power of 500mW which is fairly low. I would like to know how to tune the power output of my radio, but very unsure of how to tune it. This picture shows my walkie circuit board and I had found 3 tunning screws on it. It may be very risky as some of the screw is to tune the frequency. I wanna tune the power output. Can someone expert help me in this? Thanks

    Overview of the Circuit board:

    [​IMG]

    Close up view:

    [​IMG]

    Tunning screw 1:

    [​IMG]

    Tunning screw 2:

    [​IMG]

    Tunning screw 3:

    [​IMG]

    Unknown Component (Should be related to Tunning screw 1) What is that? Any Idea?:

    [​IMG]


    Thanks in advance.
     
  13. vin92

    vin92 New Member

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    FRS/GMRS Two way radio: Motorola FV200

    The Motorola FV200 is a FRS/GMRS Two way radio with a 500mW TX Output Power. It was said on the box packaging that it is able to communicate in a range of 5 miles under optimum condition. I just wanna check since mine is a FRS/GMRS radio set, will my range increase if I use the GMRS channels rather than FRS channels? Thanks.
     
  14. vin92

    vin92 New Member

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    Hey guys, I 'm using a Motorola FV200 2way radio. It has a transmitting power of 500mW. Just wanna ask you some questions:

    1. I am able to hear communication made on the radio by a school which is located 100m away from my home. However, when I replied back, no one could actually hear me. Since the UHF signal needs to make its way from school to my house, it undergoes the same obstruction as when the UHF signal travels from my house to the school. I am pretty sure that may radio is working and fully functioning well. I am also using a fully recharged 3 AAA batteries, but when I pressed the PTT button, the LCD screen faded till no indication. My battery is freshly recharged you know. Does it mean that my batteries are too old which causes the power to transmit to drop till no one could hear me 100m away? Or other possibilities can surface?

    2. Since my FRS radio is a 500mW transmitting power, will I have a longer range if I use those GMRS channels presetted on my FRS/GMRS radio with 500mW transmitting power as compared to FRS channels with 500mW transmitting power?

    3. If I want to modify my antenna, I heard from some forums that it has to be in a certain length inorder for resonance to occur which makes the transmision optimum. Or I can use any length? I also noted that it is illegal to do such modification under the FCC rule, but I wish to know more about it. Thanks.
     
  15. Ross Craney

    Ross Craney New Member

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    Non of the advice given so far in this thread will work. The equipment you have is a toy , accept it as such.
     
  16. haze10

    haze10 New Member

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    I saw a youtube video about increasing the range of a RC transmitter. Basically, you build a reflector to install around the antenna to increase the gain. You would have to know where the other person was as you would have to point the antenna to them. But this is low cost and will increase range.
     
  17. mneary

    mneary New Member

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    These radios also have "privacy codes". Sort of a misnomer, since turning them off enables you to hear everything. But if the school has them turned on, they won't be bothered by transmission on the same channel (as you are) if you have a different (or none) privacy code setting.

    Ideally this allows several families to share a channel and they won't have to listen to one another. If they overlap, it does mean 'unexplained' interference.
     
  18. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    Dont believe half of what you see on UTUBE!!!!

    RC frequencies are ~75MHz. Wavelength (λ) at that frequency is ~4 meters. A corner reflector for that freq would be huge, 2λ high x1λ wide, or 8m x 4m.

    Even for 450MHz (GMRS or FRS), a corner reflector would be 1.2m by 0.7m!
     
  19. Vizier87

    Vizier87 Active Member

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    I've tried that.. not impressed with the result, that's it.
     
  20. Ross Craney

    Ross Craney New Member

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    OK here is the ONLY way to do it . Build a stacked bi-phase yagi. Then you will have a walkie talkie the size of a pack of ciggies runing an antenna the size of a small car. What a hoot ! And the performance difference will be un noticeable
     
    Last edited: Apr 5, 2010
  21. JimB

    JimB Super Moderator Most Helpful Member

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    With these requests to increase the range of toy radios, the emphasis is usually on increasing the transmitter power, sometimes on improving the antenna, but nobody ever considers the possibility of improving the receiver.
    Why is that?

    JimB
     

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