Close
  • '

    '. , , ... ? GPS

     

    , , , . , , " "  " .  , . , , . . . .

    – .

    – , , .

    , – ,

    ? --. , "" () , .

    – . (Hz), . . (MHz) .

    – "" .  (, Watt) . " ".

      , :

    ( ) 20 20,000 . , :           ( ? ) .  

    " " , . (Modulation). – () , . – () , . 

    (AM – Amplitude Modulation) – , . " , . , , . - "".

    (FM – Frequency Modulation) – . " ,   . . . , -   . AM FM - .

    AM , . , . FM , .

    " , :

    1) .

    2) , .

    " :

    1)     , , ( ) ( ).

    2)     " , , ( )

    - (Half-Duplex). , ( ), . – .

    – , , , , , .

    – . , .

    . . . , , , . " (), Squelch , ( , ). . PTT ( , Push to talk)   . , , . 

     

    . , ( - wire . . .). , . ( ) , " (). , , , , , . , ( ), (, ). , (). : = . = 300,000,000 . , CB 27 MHz 2.77 .   , , " , . ( ). , ( ). , . , . , .

    " , " ( ), " , . " . ( -PTT), , (1) , , , (). , " ( ).

    . , . . . , . ( , ), " " , , (, , ). , , = .

    , , , . , , . ( ), ( ), ( , ).

    CB – Citizens Band

    CB -27 Mhz, ( "), 4 . 40 , -CB 40 . 9 .

      4 , 4 . AM,    . 26.965 Mhz – 27.405 Mhz CB, -, , . CB , 0.5 2 .

    CB

    FRS – family Radio System :

    FRS , -460 Mhz, . 14 . ( ). , 38 - (" ), , ( , ). . 2 , 0.5 -2 . FM.           

     

    FRS

    Maxtrac

    " . , . , ( ) ( ) , . / , . 16 / 32 , ( " ). -CB. -800 Mhz, -400 Mhz. -800 -400. 25 40 , !  " , , 2, 13, 24. -400 Mhz -FRS FRS . -400 Mhz, 4 .

    :

    CB: (50$ "), CB , 40 . , , , .

    FRS FM, , , , . , , .

    400 " , , , FRS - , . , .

    . ?

    : ' . CB , FRS, . , , CB , ",

    : , ?

    : ( " ). , , = . . , , , . ( ) .

    : ?

    : , , ( ). (, , ). , ( ), , . ( , ). , . , .

    : , ?

    : , . , ? , - ? . ( FRS   CB) , ( ). , , . , , , . – . , .

    : ?

    : , , ( " ), ( ). FRS ( ) ,  . CB , " ( -CB), . , . , " ( -FRS), . , , , , .  , , ( ).

    : ?

    : . , ( ) " . . CB FRS  . , , ( ), . , . , , (" , ), . . . , ( , , ).

    13
    1. zivo's Avatar
      zivo -
      ...

      1- (BAOFENG, PUXING...) 136-174MHZ VHF. , VHF UHF.
      (5W 4W 8W 6-7W).
      , ', , , , .
      - , VHF?

      2- (") , ( Windeband Narowband) , "" (50K-2.5K).
      , (" )?
    1.  's Avatar
      -
      "" .
      .
      . (-:
      , . .
      . .
      , .
      , .
      .
      .
    1. zivo's Avatar
      zivo -
      , , .
      ( ) " ?
      ?
    1. erezgur's Avatar
      erezgur -
      , 2 , 2.5K .

      / - "", - .

      , .
    1. Pageup's Avatar
      Pageup -
      ( )

      ( :
      ).
    1. zivo's Avatar
      zivo -
      \ , .
      ( ).
    1. ruby572's Avatar
      ruby572 -
      = .
      , , .

      25khz.
      90 12.5khz.
      .
      12.5khz.
      .
    1. 's Avatar
      -
      DBI
    1. boaz avrahami's Avatar
      boaz avrahami -
      ?
      ?


      Jeep Grand Cherokee ZJ 98 V8
      Honda TRX300EX
    1. biranit50's Avatar
      biranit50 -
      . ...
    1.  's Avatar
      -
      .
    1. biranit50's Avatar
      biranit50 -
      :
      frs pmr446 pmr
      2018 pmr 8 " 16
    Untitled Document