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kufungua FM radio transmeter!

Discussion in 'Tech, Gadgets & Science Forum' started by XOXOQY, Nov 24, 2011.

  1. X

    XOXOQY JF-Expert Member

    #1
    Nov 24, 2011
    Joined: Feb 7, 2011
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    Nataka kufungua mtambo wa kurusha matangazo ya radio ktk mawimbi ya FM kwa umbali wa 100km mkoa flani hivi,Vifaa vyote ninavyo.SWALI NI JE UTARATIBU WA SHERIA YA MAWASIAN0 UNASEMAJE?NA ULIPIAJE WAKE UNAKUWAJE?KWA WANAOFAHAMU HILI NAOMBA KUWAKILISHA!
     
  2. King Kong III

    King Kong III JF-Expert Member

    #2
    Nov 24, 2011
    Joined: Oct 15, 2010
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    TCRA Frequency zimejaa za kurusha
     
  3. King Kong III

    King Kong III JF-Expert Member

    #3
    Nov 24, 2011
    Joined: Oct 15, 2010
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    It is not possible to have hundreds of miles of range on FM broadcast band (87.5MHz to 108MHz), even if terrain is perfectly flat and you have your antenna on the top of the mountain and you're using killowatts of power. It is occasionally possible due to special atmospheric conditions, such as inversion etc. Such special conditions happen rarely and only last for a very short time so it is not possible to rely upon them in any way. In order to cover so many square miles it is necessary to setup a grid of transmitters and link them via wireless audio links, making sure they do not transmit at the same frequency as they could interfere.

    Finally, for absolute novice, there is no difference in range between transmitters of different manufacturers, provided they're operating at the same power level. The difference can show in audio quality, reliability, life span and spurious emissions. There are no secret designs or techniques to reach further with the same amount of power out there.

    2. What are the building blocks of a radio station, what do I need to setup a radio station
    Incidentally, we have provided a number of prepared complete packages for you, containing everything you need to start broadcasting immediately and explaining what is included in the package. These complete packages can be found here. It is recommended that you check them out even if you do not intend on purchasing any of them, just to get some feel of what you need.

    Here is a quick list of things you need to start your own radio station:

    A.) FM radio Transmitter
    This can be any of our FM transmitters, depending on your budget and your target range. If you just want to cover your property (house, apartment, yard), think about PCI MAX. This transmitter is a PC card, you can insert it into your PC (just like any other computer board) and it turns your PC into a FM radio station.

    If you want a higher quality solution, think about our boxed standalone transmitters. This is the way to go for everything but the most basic setups. Note that you can still use your PC to play audio and simply connect your sound card to the external stand-alone transmitter. Beginners are advised to consider either Cyber Max Micro or Cyber Max FM+ 15W (v2) for their first radio station. 15W will satisfy most small comunity radio stations, college radio stations, drive-in cinemas, village setups, tunnel radios or small transponders. If you need more power, consider stronger unit or get 15W or 25W now and add a 1KW amplifier later.

    Yet cheaper are our FM KIT boards (either assembled or in a KIT form). They are just the FM exciter and require a stereo encoder to produce stereo signal. They also require a bit more knowledge to mount into a case, wire audio and other connections and operate. A novice is advised to check our boxed units instead.

    B.) Antenna.
    PCI MAX comes with a very rudimentary short-range small handy antenna. All other transmitters require a proper antenna and as a consequence provide vastly superior range. There are two major antenna groups, the directional (transmit most of the power in one direction and thus provide substantial gain) and omnidirectional (transmit in all directions, lower gain). You need to be carefull about several things:
    - Antenna needs to be placed as high as possible, preferably on a roof or a highly elevated tower.
    - Keep your coaxial cable as short as possible, but still make sure antenna is at least a few meters away from the transmitters and other audio equipment.
    - Choose a good location. A mountain top is just about perfect
    - Keep your antenna away from audio gear and computer/power supply/transmitter. Also well away from TV or other antennas, cable TV coax and other installations.
    - A good antenna system is a much better investment than an amplifier.

    Also check our antenna guide.

    C.) Coaxial cable
    T transfers the energy from your transmitter to the antenna. The exact type needed depends on the length of cable, power level and your budget. Short cable and low-power installations are happy with RG-58 or RG-213, for longer runs and higher power levels use a better cable. You can check specs and buy coaxial cable here.

    D.) Power supply
    Some transmitters require external power supply, others don't. Make sure to check the specs of your chosen transmitter and include mains power supply in your order, where necessary. If you're low on your budget, build your own.

    E.) Audio equipment
    This can be a limiter - compressor, tape decks, mixing tables, cd players or even a PC. Note that it is not necessary to use PCI MAX in order to use your PC as audio source. In fact even professional radio station use PC's today to stream their audio. Next, you need a good microphone, preferably on a noise-free boom (won't annoy listeners while you move it), a convenient mixing table and a good library of music to play, depending on your target audience.

    F.) Radio Etiquette; act responsibly on the air!
    Remember, people out there will be listening. There might be children out there so act responsibly.


    3.) CYBER MAX FM 15W installation example
    Here we will show you a typical small radio station. Simply scale-up power or substitute another antenna/transmitter for your particular application.

    Cyber Max FM+ is our most popular boxed unit and it forms the heart of many small community radio stations worldwide. Probably for its simplicity and features at a great price. It has built-in LCD display and makes it really easy to control frequency and power simply with the push of a button. SWR and TEMP protection make it fairly rugged and almost indestructable even for a novice. This unit runs on 12-15V DC so it can even be used in remote areas and powered with solar cells or a car battery. A small mains power supply can be used for fixed installation and can be purchased together with the transmitter. Another strong point is the optional built-in RDS encoder (This is a system which makes it possible to send radio text messages to your radio receiver). We have chosen the DSP version (Model B) as we want to comply with regulations which call for sharp lowpass filtering and 19KHz notch filter. The non-dsp versions work fine for most applications, but provide weaker audio filtering out of the box.

    
    Cyber max FM 15W with Comet antenna, coaxial cable and a PC, a simple radio station primer



    WHAT WAS INCLUDED IN THIS SAMPLE 15W SETUP?
    - 15W FM transmitter
    - Comet antenna
    - 10m of Belden H-155 coaxial cable
    - Universal mains power supply (works worldwide), this item is listed under transmitter

    ADVANTAGES
    Exceptional price/performance ration, easy to handle and suitable for beginners.

    DISADVANTAGES
    Hardly any, you can substitute more power or a better antenna depending on your needs.

    RANGE
    It is never easy to predict range. It basically depends a lot on your antenna location, soil conductivity, antenna height and other factors. You can expect anywhere from 1Km to 10Km range, perhaps less in extremely unfavourable conditions and possibly even 20Km in extremely favouorable conditions. Check the top of this page to get more info.

    WHAT ELSE YOU (MIGHT) NEED AND WASN'T INCLUDED?
    - SWR meter to tune your antenna (optional).
    - If you need RDS, select Cyber Max FM 15W with RDS encoder.
    - Various audio or RF connectors.
    - CD players, mixer, microphone, a PC...
     
  4. Inkoskaz

    Inkoskaz JF-Expert Member

    #4
    Nov 24, 2011
    Joined: Nov 6, 2010
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    mkuu kwa Dar masafa yameisha .unaweza kupata licence kwa ajili ya mikoani tu
     
  5. KIBURUDISHO

    KIBURUDISHO JF-Expert Member

    #5
    Nov 25, 2011
    Joined: Mar 28, 2011
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    Mkuu nisidie na mimi japo na wewe umeuliza swali lakini linalohosu upande wa usajiri.Kuhusu vifaa ni vifaa gani vinavyotakiwa?ili uweze kufungua hiyo fm radio tafadhali naomba uniorodheshee vifaa hivyo na vimeghalimu sh ngapi.
     
  6. Ozzie

    Ozzie JF-Expert Member

    #6
    Nov 25, 2011
    Joined: Oct 9, 2007
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    Acknowledge source!!!

     
  7. Lambardi

    Lambardi JF-Expert Member

    #7
    Nov 25, 2011
    Joined: Feb 7, 2008
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    Freq za mikaoni nyingi pia zimeisha...ila wajanja wanazo mifukoni wanazilipia nakumbuka mwenye radio moja arusha mpya mpya hivi amenunua freq kwa 50m tsh....toka kwa mdau aliewahi nunua ....
     
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