[Elecraft] SDR-IQ and K2

[Jack Smith]

Steve:

1. 4898 KHz is the nearest to 4915 KHz cheap, off-the-shelf crystal that 
Tony (developer of Softrock) found. It has the advantage for anyone not 
using a high isolation buffer amp such as the Z10000B, that the local 
oscillator leakage is outside the K2's crystal filter bandpass. This 
avoids hearing the Softrock local oscillator as a steady carrier in the K2.

2. Yes, the K2 shifts frequency with mode changes. You can measure your 
K2's shift by tuning a strong stable signal and working through the 
modes and observing the shift on the Softrock/software display.

Jack K8ZOA


On 11/10/2011 11:06 AM, Steve Bunting wrote:
> Hi Folks,
>
> I have a Z10000 buffer board in my K2 and have used it to drive a
> softrock as a panadapter for some time. It works just fine, but I have
> left this uncalibrated and my PC doesn't really have enough horsepower
> to run my external soundcard.
>
> I have been trying to reduce PC overhead and introduce "click to tune"
> by using an SDR-IQ instead. The system displays OK, but I cannot get
> Simon's SDR-Radio software to calibrate the panadapter to zero beat the
> radio RX. I know about the cal functions, but can't dial in enough
> offset for all modes. I suspect I am doing something fundamentally
> incorrect - can anyone help?
>
> 1) I am using telling the SDR that the IF is 4.915MHz. I assume that is
> correct? I see that the soft rock radios are at 4.898MHz and I am not
> sure why.
>
> 2) I assume the K2 offsets the frequency when modes are changed? If so,
> by how much on each mode? Does any mode have no offset at all? This
> would be the one I need to perform my initial calibration with.
>
> If any one has a K2 working with an SDR-IQ (either with SDR-radio or any
> other software that provides click to tune) I'd really like to hear from
> you - i have plenty to learn!
>
> Thanks es 73
> Steve
> M0BPQ
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