[Elecraft] K3: DSP Bandwidth Limit

[Lyle Johnson]

Fred,

The audio CODECs in the K3 have a 12 kHz sample rate.  This puts the maximum audio bandwidth at 6 kHz.  Practical limits of DSP filtering in the context of the K3 implementation limit audio to 4.5 kHz or so.

Aliasing around the 12 kHz sample rate of the CODECs required that “brick wall” low pass filter as well as additional analog filters after the audio DACs to eliminate those aliasing artifacts.

73 ,

Lyle KK7P (at the Grand Canyon)


Sent from my iPhone

> On Dec 13, 2019, at 11:24 AM, Fred Jensen <k6dgw at foothill.net> wrote:
> 
> Could you explain a little more?
> 
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
> 
>> On 12/13/2019 6:19 AM, Joe Subich, W4TV wrote:
>> Remember, the DSP display is audio.  5 KHz represents 10 Hz at
>> RF (IF).
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to kk7p4dsp at gmail.com