Titre: OPTO'S with BAYCOM -MODEM

From: OZ1CSE@OZ4BOX.SAX.LOL.DNK.EU
To  : BAYCOM@WW



Hello all BAYCOM -MODEM users..

I have made this small OPTO PCB for a wile ago.. And have no problems at
all using it with baycom/tfpcx or BPQAX25 !!!
So therefor i thougt it would be a god idea for YOU ! Try it.. and i'm open
for any improvements or ?? ...

Here it is:


8  NOTE(1)           OPTO1
O--RXDATA------PIN4 -|e  |
    +----------PIN5 -|c  |-PIN2----< 470E >------c\      2,2K to 10K
    !               -|   |-PIN1-- +5V -----+        |--b---< R >---- RXDATA-O
    !                                      !     e/
7   !  1,0 K            OPTO2              !     !
O-- ! -< R >-PTT--PIN1 -|   |              !     !
    !      +-PIN2 ------|  c|-PIN5 --- +5V +     +-----------O GND (MODEM)
    !      !           -|  e|-PIN4 --------------------------O PTT (MODEM)
    !      !*NOTE(2)                       !
4   !      !     1,0 K         OPTO3       !
O---+-- TXDATA -- R -----PIN1 -|   |       !
O----PC-GND+-------------PIN2 -|  c|- PIN5-+--5 volt ---O
5                              |  e|- PIN4----TXDATA ---O

NOTE 1: YOU may be able to insert a resistor between pin 8 and 7 to switch
the level between -10 to +10 volt ! But i don't think that it makes any
differens on the receiving. I havent yet tryed it.. so...
NOTE 2: PIN2 from OPTO 2 and PIN2 from OPTO3 are connected to the GND from
your PC.. I'm only writing this, so you don't think that it is conntected
to TXDATA ..hi

VY 73's DE Egon / OZ1CSE @ OZ4BOX.SAX.LOL.DNK.EU