

Baycom modem. 1200-2400bps Packet on VHF...

 ,     ,  ""     - TNC (Terminale Node Controller).        (  , ,  RTTY-), TNC  "",      -25,    ASCII-,        .

TNC   ,  ,  ,    .., .. ,  ,     . , ,  :         ,       TNC,   ,          ?

  DG3RBU  DL8MBT       COMMODORE C-64,   DIGICO-64.    ,       -      .  DIGICOM-64     ,     COMMODORE C-64  .     IBM PC, ,         .   1988    N8KEI  ,       IBM PC  TNC.    PMP (Poor ManPacket -    ).     "73"  1991       .   1990    BAYCOM,    ,   DIGICOM-64.

 ,  ,       IBM PC,        .         TCM-3105, pp DG3RBU   .



GIF  -   GIF  - 20Kb ZIP  -     - 2 Kb ZIP  - PCB,    (5x9 )  PCX - 15Kb 

   3.5 ,       RS-232. BAYCOM      RS-232:  DTR     (   ), CTS -  , RTS - PTT (Push-To-Talk -  ),     . 

      1200  2200 ,       1200 .     (300 ,    200 )    .

B.3 (RW3DR) 
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   ,        25pin.         .


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   -   2400.        Exar - XR-2123   2400    CCITT - V.22  V.26.        ,      / (   TCM3105    1200)     (  ) .      DPSK      S/N,     ,       .             .   ,    ,      30-50%.

    ( 70%)   ,    TX/RX      TxDelay.      PacLen     1200  MaxFrame  ,         .   ,    Users        MaxFrame=1.  T1 - Frack,   1-2     3-5  .       T2 - RespTime.


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     / TCM3105    2400,   ,      .             AFSK .        2400  TCM3105.

 :



""  ( 1)   AFSK         /,  TCM      -   . ,    ,     AFSK        2400. ..            2400Hz.              AFSK  0  1. "__ AFSK" = 0.8*_/

 2400            1920Hz.       ( 0) ""              /. 

   -         2400    .   8,    ,   / -   2160Hz   2400,    3960Hz,     /.     ,     .        6.5536Mhz.



   2400     (  , ,   )   RxB.  Baycom      .     IPMSU, rxb_tune.arj


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