[Elecraft] RX I/Q output planned or thought about for the K3/P3?

[Geoff Wolf AB3LS]

Thanks for the input guys.

I wanted to see if this was possible. Oh well.

I'll go look at the Softrock again.

73
DE AB3LS

On Wed, May 9, 2012 at 2:03 AM, Joe Subich, W4TV <lists at subich.com> wrote:

>
> Geoff,
>
>
> > I suppose the thing I'm trying to get at is a direct I/Q line from the
> > K3... Whether a software update is possible to add this to the current
> > Stereo Line-Out jack (on the back of the K3) or not.
>
> At present, there simply *is no hardware* capable of providing a direct
> I/Q output to the stereo line out jack.  Line Out audio is "0 Hz based"
> following the main/sub RX.  I doubt the K3 has enough processing power
> to do a separate 15 KHz to 6 KHz I/Q conversion and even if it did the
> output bandwidth would be severely limited by the 1st IF ("roofing")
> filters.
>
> The P3 certainly has no provision for separate I/Q audio output.  Other
> than the display. the entire P3 electronics would need to be duplicated
> to generate an I/Q output otherwise the audio (if it could be extracted
> from the P3 and there is no DAC to do so)would be limited to the span
> and resolution of the P3 display.
>
> As Tony has suggested, the proper way to get wideband I/Q audio from
> the K3 is by use of a SoftRock with Clifton Labs isolation amplifier
> or an LP-Pan connected to the K3's wideband IF output. Other solutions
> would essentially be reinventing the Softrock or LP-Pan and any USB
> based solution would likely be limited to a 48 KHz sample rate if it
> used one of the commercial USB sound chips.
>
> 73,
>
>   ... Joe, W4TV
>
>
>
> On 5/9/2012 12:03 AM, Geoff Wolf AB3LS wrote:
>
>> Tony,
>>
>> Yes I am aware of Softrock and LP-Pan, as well as a whole slew of other
>> SDRs you could use with the K3's Buffered IF Output.
>>
>> I suppose the thing I'm trying to get at is a direct I/Q line from the
>> K3... Whether a software update is possible to add this to the current
>> Stereo Line-Out jack (on the back of the K3) or not.
>>
>> 73
>> DE AB3LS
>>
>> On Tue, May 8, 2012 at 11:31 PM, Tony Estep<esteptony at gmail.com>  wrote:
>>
>>  On Tue, May 8, 2012 at 10:14 PM, Geoff Wolf AB3LS
>>> <liltechdude13 at gmail.com>**wrote:
>>>
>>>  ....way to get I/Q data to a computer from ...an extra module....?
>>>> =============
>>>>
>>>
>>> Well Geoff, one way is to use a Softrock-IF (a kit, available from KB9YIG
>>> for less than 30 bucks); another way is to use an LP-Pan (available from
>>> http://www.telepostinc.com/LP-**PAN.html<http://www.telepostinc.com/LP-PAN.html>).
>>>  The LP-Pan costs way more but
>>> has
>>> better dynamic range and other fancy features; nonetheless the little
>>> Softrock is a dynamite piece of engineering and does a great job.
>>>
>>> In either case you will get much better results by adding an outboard
>>> sound
>>> card instead of your computer's on-board card. I use an EMU0202, no
>>> longer
>>> made, but others are good too. You take IF out of the back of the K3 and
>>> feed the Softrock or LP-Pan, and get I-Q out.
>>>
>>> Tony KT0NY
>>>
>>>
>>>
>>>
>>> --
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