[Elecraft] Manual notch In K3

[Arie Kleingeld PA3A]

Johnny,

This is correct. Same experience here.

Although I would like that the notch would take the carrier out like a 
conventional IF notch.

It has been said several times in the reflector that taking out the 
carrier and increasing the gain again would degrade performance, 
especially the dynamic range.  If I do not reproduce this right, please 
anyone in the group, please correct me.

What I think of this? I disagree strongly. Not on the IMD thing, I 
cannot measure such things here anyway. I disagree because I feel the 
performance has already degraded. There is a great reduction in 
sensitivity because of something that I cannot hear  (the notched carrier).
Why care about dynamic range in this case? Signals must be very strong 
to even bring up a spurious on the noise level of the K3. Now I have 
something I donot hear and dont want to hear that messes up the sensitivity.

There must be enough spare performance in the K3 to reduce ( I donot say 
eliminate) the effect of the notched carrier?
Say up to the level of what the DSP filtering normally does if working 
with a wide roofing filter.

I plee for a solution.

73
Arie PA3A


Op 10-11-2010 5:18, Johnny Siu schreef:
> I attempted to manual notch a strong carrier adjacent to a weak station. 
> Although I was able to notch out the strong carrier (from the audio), there was
> no reduction in S meter level caused by that strong carrier.  In other words,
> the weak station did not pop out from the noise because the stronger
> carrier de-sensed the K3 AGC.
>
> Johnny VR2XMC
>