[Elecraft] K3 LoCut/HiCut

[Gary]

Thanks Nate. The audible effects are as I expected them to be when adjusting
low or high cut but the visual representations on both the K3 and the P3
were not and had me a bit confused. I'll continue to experiment.
73,
Gary

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Nate Bargmann
Sent: Wednesday, November 24, 2010 1:32 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 LoCut/HiCut

Gary, it may be easier to visualize each control manipulating a variable
high pass and low pass filter.  The Lo Cut cuts off low frequencies, or
rather, sets the cutoff frequency of a high pass filter.  The Hi Cut
does likewise, except it controls the cutoff frequency of a low pass
filter.  They allow you to adjust either side of the passband 
independently.  You can acheive the same thing with the Width and Shift
controls it's just that the way the K3 is set up using Width works well
on CW as it adjusts both cutoff frequencies but maintains a constant 
center frequency of the passband.  On SSB using either the Lo or Hi Cut
controls can significantly reduce QRM from one side or the other.

On my recently departed FT-920 only the Lo and Hi Cut controls were
available in the DSP.  I like the K3's selection of either way of doing
it depending on the situation.  Over this past SSB Sweepstakes I found
the Lo/Hi Cut indespensible for digging stations from between others.

Experiment!

73, de Nate N0NB >>