[Elecraft] KX3 and Data Mode Interface

[Don Wilhelm]

Frode,

The KX3 does not contain isolation transformers - there is not adequate 
room inside.
Yes, you may connect to the mic and phone jacks directly, and that can 
sometimes be done if the computer and the KX3 are properly bonded 
together (see K9YC's papers).  If the bonding does not cure hum and 
noise pickup, you will probably have to add isolation transformers 
outside the KX3 (or use an interface box).

73,
Don W3FPR

On 3/17/2012 3:29 PM, Frode LA2RL wrote:
> The K3 Manual says clearly that the Line In and Line Out signals are
> isolated with transformers and that these ports therefore can be connected
> directly to a computer sound card.
>
> I have read carefully through the KX3 Preliminary Manual but I have not
> found any information about isolation of the input and output analog
> signals. I therefore suppose that the KX3 does not have any isolation on
> these ports, however on page 18 the manual says that you can connect the
> computer audio to the MIC jack and the KX3 phone jack to the computer's
> audio input. So I am still somewhat confused.
>
> 73
> Frode LA2RL
>