[Elecraft] Kx3 RxIQ

[Chris Hallinan]

Thanks Barry, that explanation helps alot.  So I'm assuming that the
IF output of the K3 is a very traditional IF as in other radios, ie
it's not Quadrature, etc.  Would that be correct?

If so, another approach would be to feed into an A/D, and then do the
rest in software, ie gnuradio.  I wouldn't be surprised to find out
that gnuradio already supports similar configurations, including down
converting (for certain), splitting and creating the quadrature output
(unknown).  Sounds like a fun project.  Wish I had time to pursue it!!
;)

If I'm reading the block diagram correctly, it looks like an 8.125 MHz IF.

-Chris

On Mon, Feb 16, 2015 at 11:03 AM, Barry LaZar <k3ndm at comcast.net> wrote:
> 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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>
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