Unless the interface is poorly designed (like some "low price"
amateur only devices), the noise floor is generally set by the
IF noise in the transceiver on the higher bands and by the
"no signal" atmospheric noise on the low bands.
A 24 bit sound card has the potential to provide greater dynamic
range than the more common 16 bit cards but *only* if the software
is written to take advantage of the "extra bits". Swapping a 24
bit sound card for a 16 bit sound card will make no difference
on existing software like MMTTY, FLDIGI/DM780, etc.
73,
... Joe, W4TV
On 2021-01-03 6:50 PM, Courtney Krehbiel wrote:
> I have a K3... the best radio I've ever owed in my 50+ year ham life. I'm currently using a US Interface Navigator with it for digital modes. This is now sold as the Time Wave Navigator and has worked really well for me for many years.
>
> My understanding is that the K3S and now the incoming K4's have sound cards built-in via the USB port. So perhaps I won't need the Navigator anymore when my K4 eventually arrives. But my question is whether there is still something to be gained using a newer transceiver interface with the K3S or K4? I've been looking at the Microkeyer III with its 24 bit audio processing. Does anyone have any hands-on experience with the Microkeyer III with Elecraft radios? I'm particularly interested if it has a lower noise floor or other features that might not be found in the stock K3S or K4.
>
> Thanks for any input or feedback!
>
> -- Courtney KD6X
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