[Elecraft] K3 x RS232

[Don Wilhelm]

Claudio,

The RS-232 connector on the K3 is generally regarded as an input.  The 
computer COM port (or USB to serial adapter) is normally considered as 
the output device.

First assure yourself (or contact support for those devices to be 
certain there are no RS-232 DRIVERS (receivers are OK) in their RS-232 
ports, and if there are drivers, can they be disabled.  There must be 
only one driver on each line of the RS-232 connection or the circuits 
will not work because an active driver's voltage level will interfere 
with the inactive drivers.  See information on RS-232 for more complete 
information and voltage levels of active and inactive drivers.

You will need two RS-232 DE9 Y adapters (unless you can find one with 
one female 3 male connectors.  The female connects to the computer and 
one each of the male connectors go to the K3, your amp, and the antenna 
switch.

73,
Don W3FPR

On 5/28/2019 12:58 PM, PY2KP wrote:
> Hi Guys
>   
> I bought a K3 and only have an RS232 output, I need to control a linear OM and antenna switch.
> How could I control the two devices ?  I think of making a Y-cable, will it work?
> Thanks everyone for the answers.