Constructor - For modem owners, an article about ways to improve communication.

   The next note is for owners of mo-
demos. Perhaps your connection problems
will now be resolved?



 NOISE REDUCTION
PHONE LINE WHEN USING A MODEM
══════════════ ════════════════════════════
 based on an article by Mike McCauley
           "Modem Noise Killer"

   The circuit shown in Fig. 1 (3 resistors)
connection and capacitor), representing the con-
battle primitive RC filter, will allow you
reduce telephone line noise and thereby
increase the effective exchange rate. Vvi-
due to the variety of operating conditions (various
personal modem types, wiring quality and
PBX equipment, etc.) are included in the scheme
variable resistors allowing us to
triple in relation to specific conditions
Viyam.

 Filter settings order

- Connect the filter according to the proposed circuit.
- Call the BBS with which there were problems
because of the noise.

- After connection, evaluate the noise level and
quality of communication.
- Try to rotate the variable axis
resistors ("roughly" - R1, "precisely" - R2) andmonitor changes in quality
communications. If you don't notice the difference, then
perhaps this is the optimal position.

      >────┬──────────────────────>
          ═╪═ C1: 1-1.SmkF x 200V
           │
      L ┌─█ R1: 10 kOm M
      and │ │ o
      n └─┐ d
      and ┌─█ R2: 2 kOm e
      i │ │ m
         └─┐
           █ R3: 100 Ohm x 0.25W
      >────┴──────────────────────>

   That's all for today. We will be waiting for yours
new works, designers!

                 ──════──