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.
SETMODE
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
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
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