[Elecraft] Does the KXUSBa (USB to 3.5mm) Have a Level Converter Inside?

[Don Wilhelm]

Ken,

I do not know the signalling voltage developed by the KXUSB.  I do know 
that the KX3 (and other devices using the KUSB cable) are capable of 
receiving the full RS-232 levels, but will only send a 5 volt level.
The KXUSB FTDI chip is powered from the USB 5 volt source, so it is a 
possibility that the voltage will not exceed 5 volts.

HOWEVER, I would suggest measuring the voltage levels at the plug of the 
KXUSB to be certain before connecting it to your FT-817.

73,
Don W3FPR

On 8/27/2016 2:39 PM, Ken Alexander wrote:
> Hi All,
>
> I'm thinking of using a KXUSB cable for CAT control of an FT-817ND. 
> The 817 apparently cannot use RS232 straight from a computer (as the 
> K2 couldn't as I recall) and requires a level converter.  However, I 
> have a handful of KXUSB cables now and was wondering if using one with 
> my 817 will be as simple as making an adapter to go from the 3.5mm 
> plug to the 8-pin mini-DIN that plugs into the 817.
>
> So, long story short; can I go straight from a KXUSB to an FT-817 
> without a level converter or do I need to add one inline.  I'd prefer 
> not to find out the hard way!  :-)
>
> Many thanks,
>
> Ken Alexander
> VE3HLS
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