[Elecraft] KX3 I/Q out span

[DF5RF]

Tom,
tnx for the info. Did you tried higher sampling rates already? Or is 
48kHz the one you found to be best?
73
Gernot
DF5RF

Am 09.06.2012 23:53, schrieb Tom Azlin N4ZPT:
> With the KX3 and I/Q audio very nice display of spectrum at 48ks/s.  
> but the resolution and niceness to me of the SDR on the computer 
> displays are not very good compared to the P3 display.  P3 with K3 is 
> perfect display out to 200 KHz span. Spectrum analyzer quality 
> exceeding that of the LP-PAN or other SDR programs in my opinion. But 
> the P3 does not add extra demodulators.
>
> So pick what you want.
>
> 73, tom n4zpt
>
> On 6/8/2012 5:46 PM, DF5RF wrote:
>> Thanks Matt, that fully answers my question.
>>
>> Anybody out there who used that feature already? I'm interested in
>> comparing this to solutions like K3+LP-PAN.
>>
>> tnx es 73
>> Gernot
>> DF5RF
>>
>> Am 07.06.2012 23:42, schrieb Matt Maguire:
>>> The I/Q bandwidth is discussed in the "SDR Applications" section of
>>> the manual. I quote:
>>>
>>>   *
>>>
>>>      The RX I/Q outputs from a receiver are not “flat” over an infinite
>>>      frequency range; the signal-conversion process results in some
>>>      slope (decrease in gain) as you move farther from the center
>>>      frequency. In the case of the KX3, the signal will be reduced by
>>>      about 2.5 dB at +/- 24 kHz, 4 dB at +/- 48 kHz, and 7 dB at +/- 96
>>>      kHz. The spectrum amplitude on the display, including the apparent
>>>      noise floor of the receiver, will “roll off” by these amounts.
>>>
>>> 73, Matt VK2ACL
>>>
>>> On 08/06/2012, at 6:49 AM, DF5RF wrote:
>>>
>>>> The KX3 seems to have direct I/Q outputs to the sound card - which
>>>> sounds really attractive to me.
>>>> The manual says the span depends on the sound card sampling rate, like
>>>> 48/96/192kHz. But it does not tell what kind of band width one can
>>>> expect.
>>>> As I read further, there seems to be a 15kHz limitation imposed by a
>>>> default roofing filter, and this will go narrow automatically under
>>>> certain conditions.
>>>> Again, what kind of span can I expect, and will it depend on any 
>>>> filter
>>>> settings or not?
>>>> Thanks and 73
>>>> Gernot
>>>> DF5RF
>>>> K2 #2328
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