ICOM CAT Interface CI-V

I did not use the CI-V  Icom CAT interface much after i got the K3 few years ago.
But it is always good to have a backup or /P station.
The CI-V i have    http://www.qsl.net/g3vgr/civ.html
Needs the RTS and/or DTR lines in high state as a pull up voltage to let it work.
That worked always very nice with a 2nd serial-port for the R/T and CW keying.
Now I wanted to use 1 USB-serial  comport for both CAT and T/R CW switching.
 Had to press in 2 more transistors 1 for T/R switching  and 1 for  CW keying. And use the 8V as pullup supply from the ICOM
Conventional  electronic parts    only I filed the  transistors flat.
This way you can make your own SMD format...
SMD parts would be the best for these things..  It took the whole afternoon ...  but it was storm  and rain anyway
4 transsitors 6 R's  1 diode 1 tan-C

Finally it worked
The IC706 is CAT controlled  from WSPR  and  N1MM   plus T/R and CW switched using the USB-serial Prolific  interface 
The ICOM IC706  settings regarding the CI-V are all default.
item 21  CV-address  48H
item 22 CI-V BAUD Aut  ( 19k2)
item 23 CI-V TRN   on  to command WSPR band switching f.i.
item 24 CI-V 731  OFF it did not work to have it on
One tricky thing: I needed to cut the RTS-CTS   pin 7-8  bridge because the RTS was also activating DTR for unknown reason. That was tough because the deepest  point in the wiring....
I kept it as simple as possible using the 8V regulated Voltage from the ACC connector
Removed the diode  the 2 switching NPN  have only a 4k7 to the base  no protection diodes since they only have to operate the low level IC706 SEND  and KEY inputs. 
 The  settings for N1MM and WSPR are   19200b 8bits  1 stop


PE4BAS, Bas said…
Pffff, Jaap ik doe het je niet na. Wat een gepriegel op die paar vierkante centimeter. Ik heb een tijdje geleden wat geprobeerd met een USB soundcard, helaas kreeg ik het niet werkend. Het idee was ongeveer hetzelfde. 73, Bas