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

[Don Wilhelm]

Martin,

Connecting the SDR to the ANT OUT/ANT IN jacks allows the SDR to see the 
enitire spectrum of the K3 antenna below the cutoff of the Low Pass filters.
Thaqt is apt to pick up any responses that are within the range of the 
SDR tuning, and if there are spurs coming from your antenna (which have 
nothing to do with the K3) then they will be seen.

Using the K3 (or P3) IF OUT will restrict the bandwidth to that near the 
K3 IF and may not show you those spurs - which are likely coming from 
devices throughout your house and your neighborhood.

73,
Don W3FPR

On 4/8/2019 10:24 PM, Martin Sole wrote:
> 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?
>>
> 
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