Aspect #04 18 января 1998

Железо

DIY - RC-filter for noise reduction telephone line.

I welcome you to the "pages" of our
Network newspapers ASpect newspaper! AND
offer you the very small
shemku, which is a little to help you in
Connect with the BBC.

 Shown in the figure the scheme (2
resistance and capacitor),
representing a primitive
RC-filter, which enables you to reduce the
noise of the telephone line and thereby increase
effective exchange rate. View
variety of operating conditions
(Different types of modems, the quality of the wiring
and PBX equipment, etc.) in the scheme introduced
variable resistors, allowing
tuned for specific
conditions.


      >>

     and C1 1 ... 2.0 microfarads to

     h

                                m

     L R1 80 ... 200 ohms on

     and Dr.

     NE

     and m

     and R2 <2 ... 10 ohms at

                 (Potentiometer)

      >>


       The order of the filter settings

Connect the filter, as shown in the diagram.
# Call the BBS, which had problems
because of the noise. # Once connected popechatayte
on the screen at the maximum possible
Speed ​​(2400) and see how
qualitatively they are vozvraschatsya.
# Try to play with the variables
resistors, while continuing to print. If
characters back to 100%, then this
is the best option.


             (C) Arny Sinen (500:812 / 00.02)