[Elecraft] KX2 Offset I.F.

[Don Wilhelm]

Mike,

The KX2 is fully an SDR with the "computer" in the enclosure.  Yes, it 
has a permanent 8kHz shift, so all the DSP operation is conducted at 
8kHz (not audio), including the nulling and suppression.

You are hearing the actual VFO freuency - it is 8kHz from the operating 
frequency of the KX2.

If you turn on the preamp, the locally heard VFO signal level should be 
reduced.  The KX2 is designed to operate normally with the preamp on.

If your KX2 and your other SDR receiver are close to each other, you 
could be hearing some leakage from the KX2 circuitry rather than from 
the antenna alone.

73,
Don W3FPR

On 12/22/2017 9:38 AM, Michael Zabel wrote:
> Hello group,
> 
> I received a new KX2 from Elecraft  a few days ago and I am really enjoying
> the little GEM!
> 
> As many of you already must know, the receiver performs brilliantly. I have
> been comparing with a couple of SDR receivers in the shack and the KX2 is
> preferred for weak signal reception in any mode.
> 
> I plan to use it portable of course, but for now have it set up in the
> shack with an SDR receiver tracking with it as a panadapter.
> 
> I have noticed that the KX2 produces about a  -74dBm signal into the SDR
> that is connected in parallel to the same Rx antenna (through a T/R switch).
> 
> The signal is offset about 8 kHz from the VFO , so the KX2 must use the
> offset full time where it was a menu option on the KX3 I had?
> 
> For anyone using a similar setup I wonder if you see the signal at about
> the same power level?
> 
> Am I correct that the nulling or supression is done at the audio stage
> within the KX2 (because I can't hear it when I tune the 2nd VFO to it in
> Dual Rx)?
> 
> Thanks Elecraft for another great transceiver and thank you all on the
> group for being there as a great resource!
> 
> KV4TT - Mike
> 
> KX2 s/n 2300
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