[Elecraft] K2 & Power Line Noise

[Michael Babineau]

Larry :

I installed the KAF2 in my K2 about 1 month ago and have played with it a lot.  
What I have found it does allow me to do in many cases is to turn off the K2 preamp 
and still being able to copy weaker signals. 

In general the AF1 and AF2 settings on the KAF2, in addition to the active audio filtering, 
add back a little bit of extra gain to compensate for the losses induced by the IF filter in the narrower positions.  

There is also a low pass audio filter that is always in the audio chain (at least in CW mode) to reduce
high frequency hiss  but its' effects are most noticeable on a fairly quiet band.

I can't compare with the KDSP2, but I am happy with the performance KAF2 considering its' price.

It sounds like maybe you need the noise reduction capabilities of the KDSP2.

Michael VE3WMB / VA2NB 

--- On Mon, 1/10/11, Larry Kendall <k5end at att.net> wrote:

> From: Larry Kendall <k5end at att.net>
> Subject: [Elecraft] K2 & Power Line Noise
> To: elecraft at mailman.qth.net
> Date: Monday, January 10, 2011, 1:42 PM
> I'd like to get some opinions on the
> K2 audio filter options.
> 
> In last year's mobile QSOPs running with the K2, the power
> line and similar noise were show stoppers in some areas. 
> 
> I've already ordered the K2 noise blanker and am also
> considering one of the 2 audio filter choices. As this K2
> will be used for mobile contesting, I can't see me fiddling
> with complex menus in real time during a mobile run. So, I'm
> not sure what the best choice is for me.
> 
> So far I've used the K2 for CW only and CW is my primary
> need for noise abatement.
> 
> Can someone who has had CW experience with the K2 AF
> option(s) and NB for wideband/pulse noise interference
> provide an opinion?
> 
> I'm also curious just how much more effective the KDSP2 is
> than the KAF2 for reducing interference.
> 
> Thanks,
> Larry
> K5END
> ______________________________________________________________