I?m considering wiring up the KX3 RX I/Q to my computer for a wider
spectrum view, but the latest LP-PAN sound card tests I can find online are
almost a decade old, and the Behringer model they suggest (UMC202HD) seems
to be discontinued or at least sporadically stocked.
Does anyone have a sound card they recommend for interfacing the KX3 RX
I/Q? Behringer does have newer models with 192 kHz sample rate but they?re
significantly pricier.

The Behringer UMC202HD is available from stock from sources like Amazon, at least at this side of the pond. It has a low noise level, excellent dynamic range and can do 192kHz sampling.
It is supported by Win11 and MacOS.

It also has an "audio output" and headset output that can be used at the same time, independent with the two I/Q inputs.

Given that it is available (and the price has dropped, at least over here!) it would still be my prime choice. The disadvantage is that it has about the same size as the KX3 radio itself.

Some time ago, I got a Creative E-MU 0202 with the purchase of a LP-PAN box. The E-MU is not only out of production, it depends on a driver that I could not get working on Win11. For me it is a doorstop and I got an UMC202HD instead.

I would still recommend the Behringer today. It will not be available forever, but it is available today, it is supported by today's computers and works well. What is not to like?

73,

Geert Jan PE1HZG

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