[Elecraft] K3 Sync AM receive freq. response

Grant Youngman nq5t at tx.rr.com
Sun Mar 22 21:56:55 EDT 2015


That's something I plan to experiment with ...
but the 13 KHz filter is considerably wider than the 5 KHz DSP bandwidth in sync mode. 

For what it's worth, the identical effect occurs with the 6 and 2.8 KHz filters also.

Grant NQ5T

Sent from my iPhone

> On Mar 22, 2015, at 8:25 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
> 
> Grant,
> 
> Synchronous AM reception is rather like SSB, so the edges of the filter are significant rather than the center.  For non-synch AM, the center is significant as you state.
> The filter slope on the low frequency side will not be the same as on the high frequency side.
> Even though the 13kHz filter theoretically has zero offset, you may find a better balance for the bass response by experimenting a bit with the offset value for that filter.
> 
> 73,
> Don W3FPR
> 
>> On 3/22/2015 4:50 PM, Grant Youngman wrote:
>> That could be. But the DSP bandwidth (10 kHz or 5 kHz in sync mode) is sitting in the middle of a 13 kHz filter.  There's a lot of room for slop before the filter edges should come into play ...
> 


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