[Elecraft] USB/3.5mm Extension?

[Jim Brown]

On 11/29/2023 7:47 AM, Andy Durbin wrote:
> The MAX3232 terminates the input with 5k which is almost identical to the KAT500 transmitter source impedance.

The impedance that must be matched to preserve waveshape is that of the 
transmission line. The RS232 protocol does not do that. Most other 
protocols do. Zo of practical cables is in the range of 50-100 ohms.

73, Jim K9YC