[Elecraft] K3: Using a K3 to route antenna signals to external devices...

[Martin Sole]

I've been playing with this sort of setup recently. I have a K3 with a 
KXV3 and an SDRPlay RSP1. For my usage I find that theP3 is a better 
option and when I want the display on the PC I have the RSP1 connected 
to the P3 IF Out and use the software set to accommodate it is working 
at a fixed IF.

I tried connecting the RSP1 with a tee piece and two short pieces of 
coax to have a separately tunable third receiver but found a lot of 
unwanted responses on the SDR receivers display. Although I did not 
investigate very far, switching back to the much more acceptable P3 IF 
out technique in short order, I can only presume leakage from the K3 is 
the cause.

It could be that I had things 'set wrong' so please feel free to comment 
but although an impedance matching splitter might not be a necessity it 
seems to me at least that some sort of buffer ahead of the SDR might 
well be.

Martin, HS0ZED


On 09/04/2019 03:06, Dave Cole (NK7Z) wrote:
> A few months ago someone asked how to move the antenna signal coming 
> in on the main antenna connector of a K3 to an external SDR via some 
> connector in the rear of the K3.
>
> The answer indicated connecting the SDR antenna to some connector in 
> the rear of the radio, and pressing some number of front panel keys to 
> route the signals from the antenna to the SDR...
>
> Can someone point me at that post, or tell me how this is 
> accomplished? The RF Signal flow on the K3 has always eluded me.
>
> Also, is the output from the K3 at zero or close to zero when 
> transmitting? i.e. is it safe for the SDR?
>