[Elecraft] Using external SDR and a K3 as antenna splitter

[Martin Sole]

I think that's pretty much it Dave. Take a cable from the Rx ant out, 
feed it to one port of a 3 way tee, take the second port to Rx Ant in. 
Take third port of the tee to the SDR. There will be loss of course in 
both paths depending on the impedance of the SDR. If your fussy you can 
invest in a mini circuits splitter and use it to replace the tee. There 
will still be loss but the impedances will be better matched and 
defined, if that's important. To make it work you need to use the Rx Ant 
switch on the K3 to send signal out the Rx ant out jack and receive on 
the Rx ant in so feeding the SDR as well otherwise the jacks are 
bypassed and only the K3 works, as normal.

Martin, HS0ZED


On 18/11/2019 23:06, Dave Cole wrote:
> A few years ago someone posted a method of using a splitter, and the 
> External Antenna jacks to feed an external SDR with the direct 
> antenna, not a IF, but a wideband signal from the primary antenna...
>
> I think it was something along the lines of add a splitter, between 
> the RX Antenna in/out, and then picking off the antenna feed to the 
> SDR from an output of the splitter...   Does this make sense?
>
> Is there a high level block diagram showing the antenna pathing for a 
> K3, with the ATU installed, and how the front panel switch labeled RX 
> ANT controls the signal path?
>