[Elecraft] K3: DSP Bandwidth Limit

[Fred Jensen]

OK, I think I read something into Joe's post that wasn't really there, 
that's how I thought it worked and I I think Joe was referring to the 
DSB BW at the 15 kHz 2nd IF.  Enjoy the GC, we stayed in a cabin maybe 
50 meters from the edge ... awesome!

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 12/13/2019 12:33 PM, Lyle Johnson wrote:
> 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
>>