[Elecraft] P3, what lies ahead?

[David Gilbert]

Finally!  Someone actually gave me an answer.

Thank you.

73,
Dave   AB7E



On 2/24/2011 10:44 AM, Joe Subich, W4TV wrote:
>
>> They obviously didn't include it, though, and in spite of several
>> public and private queries from me regarding the reason for that
>> omission I never got a single answer.
>
> Examination of the P3 data would suggest that I/Q do not exist
> except in the digital domain.  I highly doubt that the hardware
> has sufficient I/O to support the add-in DAC necessary to provide
> analog I/Q for an external sound card.
>
>> (the other reason is that there is no capability to display the 2nd
>> receiver even if I hardware hack the K3 to bring out the 2nd IF)
>
> That's incorrect.  All you need to do is provide an IF signal from
> the KRX3 instead of the main receiver.  Th P3 will happily display
> that signal although the VFO A/VFO B controls will be reversed.  I
> don't think it would take a whole lot for Al to add an "A/B" function
> although I'm certain it is *way* down the priority list.
>
>> Anyone who wants to run CW Skimmer or any other third party SDR
>> software will have to buy another piece of hardware to do it, when
>> the P3 could have easily provided that capability.
>
> It is far from "easy" or cheap to provide that capability.  Given
> the structure of the P3 the necessary independent I/Q signals are
> not preset ... the only accessible I/Q are based on the selected
> display width and are locked to the display's center frequency.
> To provide the support you seek would take a second AD6620, a
> second control interface from the dsPIC, DAC and audio drivers
> - none of which are available in the P3.  The cost of the "add on"
> to drive a separate sound card for CW Skimmer would be substantially
> more than the LP-Pan hardware and provide no additional benefit.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 2/24/2011 12:06 PM, David Gilbert wrote:
>>
>> Don't hold your breath waiting for that.  I lobbied long and hard for
>> that capability (buffered IQ outputs) from the very beginning ...
>> starting back when Elecraft first announced they would be introducing
>> the P3.   They obviously didn't include it, though, and in spite of
>> several  public and private queries from me regarding the reason for
>> that omission I never got a single answer.  The lack of IQ outputs is
>> the single biggest reason why I will not buy a P3 (the other reason is
>> that there is no capability to display the 2nd receiver even if I
>> hardware hack the K3 to bring out the 2nd IF).   Anyone who wants to run
>> CW Skimmer or any other third party SDR software will have to buy
>> another piece of hardware to do it, when the P3 could have easily
>> provided that capability.
>>
>> 73,
>> Dave   AB7E
>>
>>
>>
>> On 2/23/2011 6:03 PM, Igor Kosvin wrote:
>>> I just assembled P3 two days ago. One of the things I would like to 
>>> see is
>>> the IQ output of the P3. The signals are definitely generated in P3 
>>> and I
>>> would guess it is just the matter of buffer and connector. With these
>>> signals and decent sound card one can play with PSDR software (open 
>>> source
>>> BTW) or number of other similar programs and even run skimmer for 
>>> the RBN.
>>> How cool is that?
>>> 73,
>>> Igor, N1YX
>>>
>>> -----Original Message-----
>>> From: elecraft-bounces at mailman.qth.net
>>> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill
>>> Sent: Wednesday, February 23, 2011 5:13 PM
>>> To: elecraft at mailman.qth.net
>>> Subject: [Elecraft] P3, what lies ahead?
>>>
>>>
>>> Has anyone figured out the possible purpose of those unused holes in 
>>> the P3
>>> backpanel?
>>>
>>> One of them labeled "sensor"  ???
>>>
>>> 73, K3UJ
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