[Elecraft] Heil Proset & K3 Audio fixed, sort of.

[AD6XY]

You are right, I had set the width as high as I could, which was 4kHz. I
didn't move the centre frequency to 2kHz.  I have just done it again but
this time with the centre frequency set to 2kHz and I see 4kHz width. The
highest I can get it up to is 300Hz-4.2kHz.

But, I found something else. I managed to have LO at 0 and HI not go above
3.4kHz. I found out that LO was actually negative, but read as zero as a
result of switching mode from Shift/Width to Lo/Hi. It really was negative
too, the other sideband came through.

I don't understand the display logic here. Surely if LO is negative, which
is quite legitimate, it should read so? If negative LO is not really
intended if the bandwidth is not really 4 kHz because of Fc, why will it
display it as 4kHz?


Mike



P.B. Christensen wrote:
> 
>> The amplitude appears fairly consistent. I think a simple low pass filter 
>> is
>> all that is needed and a cut off of maybe 7 kHz would be appropriate. 
>> Maybe
>> even lower as this 4kHz ESSB plot with the FM filter shows, the audio
>> response is limited above 2.5kHz.
> 
> Mike:
> 
> You may want to revisit that last measurement.  My measured data closely 
> mirrors that shown on N1EU's website with the 6 kHz filter engaged:
> 
> http://n1eu.com/K3/K3_notes.htm
> 
> See chart entitled " Elecraft K3 SSB Receive Passband..."
> 
> Paul, W9AC
> 
> 
> 
> 
> 
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