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Digital on Kenwood TS-440s

Posted by @G5RAC (G5RAC)

to vote, or .

Looking for some help.

I have a kenwood TS440s with the 2 chips for digital/CAT fitted (I have 2 sets of chips, tried both) and a CAT cable.

No matter what I try I can not get CAT control to work.

I have fitted the chips, connected the cable, checked port evrerytime, reset radio many times (A=B and power buttons) and still no go.

Has anyone got any ideas?

TIA G5RAC

Comments

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@W1DVR ·
Hi @G5RAC,

I would first check that your CAT cable is the correct type for the TS-440S. The TS-440S does not use a basic serial cable; it needs the proper Kenwood/IF-232C style interface.

Also make sure you are using the ACC1 6-pin DIN port, not ACC2.

Try these settings:

4800 baud, 8 data bits, 2 stop bits, no parity, no handshake.

If that still does not work, I would suspect the cable/interface before the radio or chips.
@W1DVR ·
@G5RAC any luck?
@G5RAC ·
no joy yet, can't seem to find a genuine ftdi chip unit so have ordered a inverter to try inverting the signal seperatly. Will update my finding here for you when it arrives.
@G5RAC ·
fake chips can not be inverted via mprog software.
@G5RAC ·
@W1DVR, got it working lol. Bought a 6-bit inverter Level inverter 74HC04 module DC2.5-5.5V from aliexpress and wired the txd from the fake RS232 FTDI in on A1 as well as the TXD from the 6 pin on TS440s to A2, then wired RXD from TS440s to B1 and RXD from fake RS232 FTDI to B2. Also wired 5V and Ground from fake RS232 FTDI to 5V and Ground in inverter board to power it. then connected RTS and CTS direct from TS440s to fake RS232 FTDI. lastly connected Ground for TS440s 6 pin to ground on inverter board.

I use MSHV for ft8 ect. and it works fully.

Still got to look at WSJT-X as PTT does not work yet. lol
@W1DVR ·
@G5RAC nice! Glad you got it working.

That confirms it was the signal inversion issue and not the radio or chips. Good info on using the 74HC04 inverter board with the fake FTDI adapter. This should help someone else with the same TS-440S CAT problem.

Thank you for the update!

For WSJT-X PTT, I would double-check the RTS/CTS or try CAT PTT vs RTS PTT in the radio settings. Since MSHV is working.
@G5RAC ·
will try it tonight and update here.
@G5RAC ·
Tried all settings, no joy with WSJT.

Will have a further look at the wires for CTS and RTS again sometime soon.

Just enjoying having it connected for now lol.

G5RAC 73