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

[Bob McGraw K4TAX]

I agree with Joe in the procedure.   As to using or the need for a 
"splitter", I don't find the input impedance of the SDR Play/RSP1 to be 
anywhere near 50 ohms.   In fact it is much higher.    Thus the result 
of using a simple BNC "T" does not load the signal of the main 
receiver.  If your SDR receiver does present a 50 ohm input, then you 
can expect to loose about 3 dB of received signal.

And correct, the SDR will be protected when one is transmitting.

73

Bob, K4TAX


On 4/8/2019 3:22 PM, Joe Subich, W4TV wrote:
>
>
>> 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...
> Connect a splitter, input to the RX Ant Out jack, one output to the
> RX ANT IN jack and the other output to the Antenna input of your SDR.
>
> Press the RX ANT button to activate the RX ANTENNA Out/RX ANT IN path.
>
> > Also, is the output from the K3 at zero or close to zero when
> > transmitting? i.e. is it safe for the SDR?
>
> Yes, the RX ANT Out/IN path is on the receive side of the T/R switch.
> There is no RF (or only leakage) present in transmit.
>
> 73,
>
>    ... Joe, W4TV
>