[Elecraft] K3S RS232 "Y" Connector causing port conflict

[Don Wilhelm]

Charles,

You should find the amp has a driver connected to pin 2.
To make sense of the signal directions, you have to know whether the 
device is configured as DCE or a DTE.  Data Communications Equipment or 
Data Terminal Equipment.  The 'transmit' and 'receive' signals are 
relative to the DTE.  In other words, the signal on pin 2 (RXD) will 
have a receicver in the DTE and a Driver in the DCE.  The PC is the DTE 
and devices like the K3 and your amplifier are DCE type.

I know that the DTE/DCE designation for the PC does not make sense, but 
the serial port of the PC started out to be a port which allowed the PC 
to behave as a terminal.

73,
Don W3FPR


On 12/14/2015 2:50 PM, charles at k5ua.com wrote:
>   
>
> Thanks for the detailed explanation Don. It seems like that is what is
> happening, the OM2500 may be sending info back on the line into the "Y"
> connector, confusing Na3P on the computer end on making the OM2500 jump
> frequency rapidly back and forth between the correct frequency and the
> out-of-band phantom frequency. From the responses, there may be 3
> possible solutions:
>
>