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SDR-IQ and K2

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STEPHEN BUNTING

SDR-IQ and K2

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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N8LP

Re: SDR-IQ and K2

Steve, you might want to look at the combo of LPB2 and NaP3. LPB2 allows
sharing of the rig port with an SDR and up to 5 apps, like LP-Bridge
does with K3. NaP3 is the latest iteration of Flex's open source
PowerSDR, has some really neat features. A version of NaP3 is in
pre-release which fully supports K2, with extensive support for offsets
for all modes.

Larry N8LP

On 11/10/2011 12:00 PM, [hidden email] wrote:

> Message: 4
> Date: Thu, 10 Nov 2011 16:06:11 +0000
> From: Steve Bunting<[hidden email]>
> Subject: [Elecraft] SDR-IQ and K2
> To:[hidden email]
> Message-ID:<[hidden email]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> 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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Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Jack Smith-6

Re: SDR-IQ and K2

In reply to this post by STEPHEN BUNTING

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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>