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Thread: Simple CB

  1. #31
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    Default Re: Simple CB

    Quote Originally Posted by packmule1911 View Post
    Thanks. So "meter" is the length of the wave.
    You got it.
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    Default Re: Simple CB

    Quote Originally Posted by packmule1911 View Post
    Bought the radio.
    Knowing how to field/manually program the radio is always good knowledge, but for general use get the programming cable and download the CHIRP software.

    www.miklor.com is a great resource for the Baofeng/Pofung radios.
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    Default Re: Simple CB

    Quote Originally Posted by packmule1911 View Post
    Thanks. So "meter" is the length of the wave. That's probably obvious, but I thought it could have been the reading on a multimeter or something like it.




    A wave is the distance a certain radio frequency travels peak to peak (well I guess null to null looking at these pictures)

    Your antenna has to "fit" inside that distance for it to be resonant.

    When it doesn't fit, the some of the power is fed back to the transmitter.

    So as you change frequency you must change the length of your antenna for it to work 100% (well near) efficiency.

    Oh and I better throw this one in so every understands why a 1/4 wave antenna would work on our vehicles.



    That means that ANY vehicle that isn't made of metal (or has enough of it) cannot run a 1/4 wave antenna.

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    Default Re: Simple CB

    Quote Originally Posted by prerunner1982 View Post
    www.miklor.com is a great resource for the Baofeng/Pofung radios.
    Thanks. No luck loading a visible page, but I'll check back.

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    Default Re: Simple CB

    Quote Originally Posted by Mudderoy View Post
    A wave is the distance a certain radio frequency travels peak to peak (well I guess null to null looking at these pictures)

    Your antenna has to "fit" inside that distance for it to be resonant.

    When it doesn't fit, the some of the power is fed back to the transmitter.

    So as you change frequency you must change the length of your antenna for it to work 100% (well near) efficiency.
    An antenna being largely a fixed length physical thing, how would you change the length to match the variability of the frequency range?

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    Default Re: Simple CB

    Quote Originally Posted by packmule1911 View Post
    An antenna being largely a fixed length physical thing, how would you change the length to match the variability of the frequency range?
    You can use multiple antennas and a switch box, or you can use a loading coil. Coils are bad because they generate heat, which is a loss of power, but a mis-tuned antenna works better and is safer for the transmitter.

    There is a thing called a screwdriver antenna that allows you to move the contact point on the coil so that it electrically changes the length of the antenna. Screwdriver antennas are said to have a higher "Q" than my set up, but I get excellent signal reports for a mobile, and HAMs seem amazed it works as well as it does. I like the screwdriver antenna, but I have a problem with hanging a 300 to 600 antenna on the outside of my Jeep, plus you have to take it apart if you park in a garage.

    I almost forgot the "Bug Catcher" antenna. These things are as ugly as our Jeeps! They have the highest "Q" rating, if I recall, but they are a manual antenna. You literally take an alligator clip with a wire attached and move it to a place on the BIG coil that makes your antenna resonate for a specific band.

    Another way is with an automatic antenna tuner, they do have manual ones. I use the IC-AH4 antenna tuner and a 102" whip. I can tune from 40 meters to 6 meters by clicking the mic and in less than 3 seconds I'm ready to transmit.

    I have a 3' mast extension for the whip if I want it to work better on 40 meters, and I believe 75 meters will tune on it. It's been awhile since I messed with 75 meters (80m) via mobile.

    Oh! I forgot about HAM sticks. You have to pull over and physically change antennas, but it's not too bad on a long trip. I have 75 meter to 10 meter HAM sticks. Used those before I got the auto tuner.

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    Default Re: Simple CB

    Quote Originally Posted by packmule1911 View Post
    An antenna being largely a fixed length physical thing, how would you change the length to match the variability of the frequency range?
    If you want to get expensive... you could run a screwdriver antenna with a controller that will adjust the length of the antenna.


    Or there is an antenna that has a loading coil and you change out the whips depending on the frequency you want to operate in.

    This is really only for HF stuff.

    If you have a 2m and 70cm dual band radio there are antennas that operate on both without changing length.
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    Default Re: Simple CB

    Screwdriver:



    Bug Catcher:


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    Default Re: Simple CB

    Holy smokes, this is getting more complicated. If I ever take this plunge, I am going to have to do some reading. And yes I understand wave, and wave physics, just seems to be so many options in equipment.
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    Default Re: Simple CB

    yeah, but it can also be done fairly simply as well. VHF/UHF is easy. It's HF where you have access to a vast majority of frequencies (General and Extra class license) where you want a radio and antenna that can do it all that gets interesting/expensive. It too can still be done pretty simply and still work well as Tony's setup demonstrates, radio, tuner, and 102" whip antenna.

    Don't let the complexity of some of this stuff scare you off. VHF/UHF may meet your needs and you wouldn't have to worry about tuners and all the different HF antennas.

    "Amateur Radio" contains a wide variety of aspects, Morse Code (yep still used but not required to get your license), voice (AM, FM, Single Side Band), Digital (PSK31, JT65, APRS, etc...), Digital Voice (D-star, DMR, Mototrbo, P25, etc).... you can also bounce signals off the moon or meteor scatter, or talk through repeater satellites in space, or talk with the International Space Station... there are contests and fox hunts, you can build antennas and radios and kits.... and on and on.

    OR..... you can use it for local voice communications and be happy with that and that is great as well.

    The great thing about Amateur Radio is that there is something for almost anyone.
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  11. #41
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    Default Re: Simple CB

    Morse code. Yuk I had to memorize that in the service. Quickly forgotten
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  12. #42
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    Default Re: Simple CB

    It's fun to talk about the complexity. I like understanding how things work. I remember how fascinating it was to find out that different sized antennas meant they were used for different things. Once you understand this simple principle you can start "seeing" things you never saw before. Like little antennas on what otherwise looks like a standard car now you know it's police, or government.

    Now look for hubcaps, or not. Yep, it's the authorities!

    It's like Jon said though, it can be really simple.

    1) Buy 26 handie talkie
    2) Look up local repeater freq on Internet, make note of freq split and pl tone
    3) Program handie talkie with freq, freq split and pl tone
    4) Key up the mic, say your call, and wait for a response.

    Now that you can make it work with that repeater, start programming in the others and save them in your handie talkie memories.

    If you don't have your license yet, step 1 and step 2 (freq split and pl tone not needed to receive) and you can start listening to the local repeater!

  13. #43
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    Default Re: Simple CB

    At some point, I will go with a CB. The 102" whip has other uses, such as sand dune flags not to mention an LED on top. Looks crazy at night on the dunes. But I think I will start with CB
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
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    Griffin radiator
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    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

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    Default Re: Simple CB

    Quote Originally Posted by prerunner1982 View Post
    If you have a 2m and 70cm dual band radio there are antennas that operate on both without changing length.
    I bought the Baofeng UV-5R that was recommended. The antenna in the picture looks good.

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    Default Re: Simple CB

    it's short and has a very strong magnet.
    1993 2 door 4x4 4.0 5 speed
    1997 4 door 4x2 4.0 auto RIP 6/6/2016
    2000 4 door 4x2 4.0 auto


    Day of Dirt Adventure

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