[Elecraft] Shortwave filters for K3

[Don Wilhelm]

Frank,

13 kHz comes quite close to the 15 kHz DSP IF, so using the 13 kHz 
roofing filter for AM transmit exposes the possibility of transmission 
at an IF image as well as the desired frequency.

As I recall, that was a wish expressed by someone, but I also recall the 
Elecraft designers saying that it has a high probability of creating 
spurs, but would be further evaluated sometime in the future.
If it has already been evaluated, then the answer is that it really does 
create spurs and cannot be used.  If it has not yet been evaluated, then 
it is still on the list for future consideration.

73,
Don W3FPR

Frank Ross W4NHJ wrote:
> Don,
>
> I thought I read some where that you can use the 13 kHz filter to transmit 
> AM by using the transmit DSP to limit modulation bandwidth.
>
> Frank
>   
>