[Elecraft] Kx3 RxIQ

[Barry LaZar]

Chris,
     If you are going after the K3 IF output, it is a single audio 
signal at the IF frequency. You will need to downconvert it to baseband 
and split it into two streams, one of which will need to be shifted by 
90 degrees. It is these signals that go to a good sound card for 
playing. It will be the only way it will work. The P3 does everything it 
needs for spectrum display. The KX3 already gives baseband audio streams 
that are separated by 90 degrees meaning all you need to do is feed the 
streams to your sound card and operate on it with software.

73,
Barry
K3NDM


On 2/16/2015 9:34 AM, Chris Hallinan wrote:
> I'm quite interested in experimenting in this area.  I've been playing
> around with SDR via gnuradio with a cheap TV tuner dongle.  Can
> someone please explain the characteristics of the signal coming from
> the IF Out port on the K3?  Is it basically in the audio domain? Is it
> this connector that would plug into the P3?  I'd like to experiment
> with viewing the signal spectrum using something similar to gnuradio.
>
> Brian, how did you connect your KX3 to the iPad?
>
> Thanks,
>
> Chris
>
>
> On Mon, Feb 16, 2015 at 8:54 AM, Brian Waterworth
> <brian.waterworth at gmail.com> wrote:
>> Yes you can.
>>
>> I used to do this with an iPad (a tablet computer) running iSDR and a
>> piglet connected into the ACC1 jack.  I used Hamlog to control the KX3 and
>> iSDR to view the RX I/O.  I decided to buy the PX3 (i.e., a specialized
>> computer) instead, though, as its power consumption seems better than the
>> iPad.  Plus, flip flopping back and forth between iSDR and Hamlog wasn't
>> helping me be productive.  You can never have too many screens :-)
>>
>> Now I use the PX3 as my panadapter instead of iSDR and can still use
>> another computer to control the KX3 (PX3 has a pass through ACC1 jack).
>>
>> On the horizon...I am excited about the Raspberry Pi 2 (on back order) as
>> this platform can support a number of Ham oriented programs I like to use
>> (FLDigi, WSJT-X).  Current draw for field work is about an amp-hour and I
>> can use my iPad to VNC into the R-Pi.  For field day or more coordinated
>> events, I would just bring a monitor and connect that to the R-PI.
>>
>> regards,
>> Brian
>> VE3IBW
>>
>> On Mon, Feb 16, 2015 at 8:34 AM, Suite, Wayne <wsuite at dfwairport.com> wrote:
>>
>>> Can I use this output to a separate computer as a 2nd receiver while using
>>> another computer to run HRD etc?
>>>
>>> KD5SPX
>>> Wayne
>>>
>>>
>>>
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