Ken,
Since the KX3 I/Q bandwidth is limited to something like 48kHz, you do
not need an exotic soundcard which will give you a 192 kHz span, most
external soundcards will do the job just fine.
The Creative X-Fi soundcard is available at a modest price, and will do
a 192 kHz span should you need it, but there may be other less costly
options that I am not aware of. The X-Fi can be modified with a couple
of added capacitors to reduce the noise level - Google for the mod
information.
The biggest consideration for use with the KX3 RX I/Q output is the
noise level rather than the bandwidth of the soundcard.
73,
Don W3FPR
On 6/24/2013 10:11 PM, Kenneth A Christiansen wrote:
Hi Don
You answered and confirmed my suspicion. I suspect since I have a new Elecraft
cable and the sound card only has the MIKE input that it is MONO. Do you know
of a USB sound card that you will work? I would rather by something good that I
know will work than spend money on something cheap that may not. I have got my
use out of this sound card on digital ham programs.
Sent from my iPad
On Jun 24, 2013, at 8:51 PM, Don Wilhelm <[email protected]> wrote:
Ken,
Are you getting a signal to the soundcard from both the I and Q channels? What
you are seeing is normal of only one channel is fed to the soundcard.
In other words, check your cables. Plug in the left channel only into the
soundcard and see if you have a signal present, then do the same with the right
channel.
It may be a cabling problem, or your sound adapter may have only mono input.
Many external soundcards have mono input when the mic input is selected, but
may (or may not) when the Line In is selected - I/Q decoding requires stereo
soundcard input - if the input is mono, you will see exactly the condition you
report.
73,
Don W3FPR
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