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From: POR018@POR018.#STB.EMD.POR.EU
To  : PACKET@EU


Hi to all de Sergei, POR018.

In this bulletin I send an excert of the manual of TFPCX 2.71 which shows
how to work with your squelch open with TFPCX 2.71. 
EX.: When using Graphic Packet edit the config file and add a line with:

  TNCINI = @C25

This will activate the Soft-DCD. You should try other values, if you have
problems. For more info, read the information below.

ÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜ

            ÛÛÛÛÛÛÛÛ  ÛÛÛÛÛÛÛ  ÛÛÛÛÛÛ     ÛÛÛÛ   ÛÛ    ÛÛ
            ÛÛ±ÛÛ±ÛÛ±  ÛÛ±±ÛÛ±  ÛÛ±±ÛÛ   ÛÛ±±ÛÛ  ÛÛ±   ÛÛ±
            Û±±ÛÛ± Û±  ÛÛ±  Û±  ÛÛ± ÛÛ± ÛÛ±±  Û±  ÛÛ  ÛÛ±±
             ± ÛÛ±  ±  ÛÛ±Û  ±  ÛÛ± ÛÛ± ÛÛ±    ±   ÛÛÛÛ±±
               ÛÛ±     ÛÛÛÛ±    ÛÛÛÛÛ±± ÛÛ±         ÛÛ±±
               ÛÛ±     ÛÛ±Û±    ÛÛ±±±±  ÛÛ±        ÛÛÛÛ
               ÛÛ±     ÛÛ± ±    ÛÛ±     ÛÛ±   Û   ÛÛ±±ÛÛ
               ÛÛ±     ÛÛ±      ÛÛ±      ÛÛ  ÛÛ± ÛÛ±±  ÛÛ
              ÛÛÛÛ    ÛÛÛÛ     ÛÛÛÛ       ÛÛÛÛ±± ÛÛ±   ÛÛ±
               ±±±±    ±±±±     ±±±±       ±±±±   ±±    ±±

                       The Firmware PC Extended
                     Version 2.71 (23. March 1998)

                   Resident AX.25-Controller for PC
              and BayCom-Modem, SCC-Boards, PAR96, YAM96
                     PA0HZP-OptoPcScc Board, KISS
                    with WA8DED-Hostmode-Interface
                            and DRSI cards


@C  DCD-Working

  TFPCX has a Soft-DCD  (software squelch). When using  slow tranceivers
  (slow meaning  a slow  squelch cirquit)  you can  leave the squelch of
  the receiver fully  open. TFPCX will  determine for itself  whether or
  not a packet signal is being received.

  The  Soft-DCD  can  be  controlled  by  means of the '@C' command, the
  given parameter controlls the noise-cancelling level.  This  parameter
  can be a  number between 0  and 63. When  using '@C0' the  Soft-DCD is
  switched off (default)- all other  values activate the Soft-DCD.   The
  lower the  value the  more unstable  and faster  the Soft-DCD becomes,
  the  higher  the  value,  the  more  stable and slower it becomes. The
  ideal DCD should be both  stable and fast. Therefore the  best setting
  will good compromise between the two extremes. To simplify the job  of
  finding the  right value  you can  use the  DCD indicator  (see option
  '-C').   When  using  a  small  value  you  will  see the unstable DCD
  indication, when using a large value you will see slow and  inaccurate
  recognition of  signals.   The best  way to  set this  correctly is to
  slowly increase the parameter value while listening to the signals  on
  the PR QRG,  until the indication  is correct. A  good start value  is
  '@C25'.

  When using  SCC, PAR96  or PICPAR  ports an  adjustment is  not really
  needed, all  values above  0 will  activate the  Soft-DCD and they all
  have the same meaning for  the operational software.  I  was, however,
  annoyed by the constant flickering of the indicator, so you can  still
  adjust the value  to reduce the  flicker. For the  YAM96 modem the  @C
  command will not work at all since it always uses a hardware DCD.

  IMPORTANT!

  The soft-DCD  only recognises  PR-Signals at  the same  baud rate. You
  can _not_ use the  soft-DCD on packet QRGs  which carry PR signals  at
  different baud-rates.

  When  using  KISS,  the  TNC  handles  the  DCD, and this command only
  defines the time  (in 10ms-Units) after  which the RX  indication will
  be removed from the  screen if no further  data was received from  the
  TNC.

  When you are connected to a  DAMA station the DCD will be  ignored for
  the used  port. The  DAMA station  will regulate  the traffic and will
  ensure a free QRG when it  sends a DAMA-poll to you, so  TFPCX doesn't
  need to double-check this. The advantage is a very fast response  from
  TFPCX, which makes the DAMA handling better. This was introduced  with
  TheFirmware TF2.7b, and is also used in TF2.7b based TNCs.

ÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜÜ

                   73/51 de Sergei, SysOp of POR018 PG BBS
                    QTH: Setubal, South Portugal (IM58NM)
                       POR018 @ POR018.#STB.EMD.POR.EU