CAT Control on Yaesu 450D
Equipment needed
A PC, RS232 cables and luck..
Nothing special on the PC is needed. A simple USB->RS232 adapter and a CAT audio interface to connect to the data port. I used a Line In/Out audio interface to connect as I didn't have get the quality I wanted from a Microphone input on a cheap-n-nasty interface.
Audio Interface (PC)
The Behringer UCA202 from Ebay was picked as it used Line input and output levels. The interface is more suited for 600 Ohm line terminations that the Yaesu prefers.
For the Radio, I used the diagram at this site to connect to two RCA plugs. I tried with and without 600Ohm audio transformers but I didn't see any performance difference.
Digital interface
Nothing special here... a 1:1 straight through cable is needed. Pins 2,3,5 and 7,8 are wired 1:1 on a Female to Female DB-9 and that's all
PC Software
As most of the time I am on FT8 or WSPR, I will be showing how WSJT software setup works. I have had very ropey results with the CAT software and things go bad quite often.
To setup the PC, (WSJT-X)
I originally left everything at DEFAULT but that seemed to be the cause of randomness. I ended up adding an oscilloscope trace to the serial port and noticed that data was not being received properly - and thats when I realised things were not good.
Playing with numbers, I managed to get it all working again using 8 Data Bits, 2 Stop Bits and no handshaking
I set the baud rate to 4800 baud to give the best chance of good data over the link.
The Radio
On the radio, using the (F)unction menu, The option CAT TOT was set to 1000 (its defaulted at 10) and CAT RTS/CTS was disabled
