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.
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