[Elecraft] KXUSB Signal Levels Was: Re: Connecting a KXUSB to the K2 RS232

[Don Wilhelm]

Mark,

All I can tell you is that the KX2/KX3 and XG3 will respond to input 
levels (on the tip) from 3.3 volts up to the maximum RS-232 voltage.  
The output (ring) from the XG2 is an FET drain connected to a drain 
resistor which connects to +9 volts.  I don't know about the KX2 or KX3.

73,
Don W3FPR

On 8/6/2018 11:17 AM, Mark Goldberg wrote:
> HI, can you confirm that the KXUSB uses TTL signal levels rather than 
> standard RS232 levels? I got an extra one with my PX3 and repurposed 
> it to talk to a GPSDO that requires TTL serial levels and it seems to 
> work fine. I just put a 3.5mm TRS jack on the GPSDO.
>