[Elecraft] Suggestions for good 192kHz external sound card fordigital modes

[Don Wilhelm]

David,

Some time ago, Wayne posted the expected falloff of the RX I/Q levels in 
dB as the width of the display increased.  That info should be available 
in the archives if you do a search.

If you have a Panadapter application loaded on your computer and a good 
quality wideband soundcard, you will be able to see the falloff on the 
display.  When receiving no signals, but only band noise, the panadapter 
passband will take on an upside down "U" shape if your soundcard is 
capable of 192 kHz.
That shape will indicate the actual falloff for your particular KX3.

The PX3 does compensate for this loss of gain as the spectrum width is 
increased.  Most of us do not have the capability to build special 
soundcard software, but if you do have that capability, perhaps you can 
make a KX3 panadapter application available to KX3 users which does the 
same "boost at the edges" as the PX3 does.

73,
Don W3FPR

On 11/11/2014 9:27 PM, David Orman wrote:
> I am using it for wide-frequency viewing, which is why I made my request as
> such re: 192kHz. I definitely want a 24bit card for the reasons you
> mentions. You also have mentioned the noise floor - this is very important
> to me. I'm often operating in non-optimal conditions, so every little bit
> helps.
>
> I posted requesting feedback on 192kHz sound cards (I should have specified
> 24-bit or better) specifically for a reason. You've basically hit the
> hammer on the head for the reasons. :)
>
> As to the falloff, can you point me to a thread so I can understand it? If
> it's something the PX3 (which I also own) compensates for, I can probably
> write code to do the same in my favorite applications.
>
>