[Elecraft] K3: Peculiar BW behavior?

[Frank Ross W4NHJ]

Walter,

This is probably not your problem, but might be worth checking.  Make sure 
you have the filter BWs entered correctly.  I had a problem, I entered the 
250 Hz filter as 250 and is should have been .250.  I got some crazy 
results.  KG4YLZ who was here when I installed the filters caught my 
mistake.

Frank - W4NHJ
----- Original Message ----- 
From: "Walter V. Gilles" <wvgilles at yahoo.com>
To: <elecraft at mailman.qth.net>
Sent: Thursday, June 11, 2009 12:49 AM
Subject: [Elecraft] K3: Peculiar BW behavior?


Greetings,

I just came across what seems to be a rather peculiar operational quirk in 
my K3/100 while reducing the BW on CW. I have 13, 2.8, 1.8 and 0.4 roofing, 
running current firmware release suite.

On 20M CW for example, as I reduced the DSP BW down, and as I hit 0.20 the 
signal dropped significantly; at 0.15 it completely cut out; at 0.10 it 
popped in again at a normal volume but shifted enough in freq such that it 
took a goodly RIT input to find signal pitch again, but stayed there at 
0.05. Going back up in BW, it just reversed the process, going out at 0.15 
and coming back in at 0.20 weak and shifted back in freq, then back to 
normal on up in BW. This behavior seems mostly to show up on 20M, and fairly 
repeatable. Occassioannly it will show up on other bands, but not as severe.

Also, on all bands, I hear a distinct click as the BW hits 0.10 going down, 
then another click as it hits 0.15 on the way up. No clicking sounds 
anywhere else on BW changes (i.e. no clicks as the roofing filters switch 
in/out). Clicks can be heard in the K3 speaker, and headphones. This 
clicking is repeatable on all bands.

The clicking is mildly annoying but new, and the BW behavior begs some words 
of wisdom if anybody has some ideas. I have not reloaded the firmware yet, 
as that would be my next step to see if something got corrupted. Note that 
this peculiar behavior was not present after I loaded the latest firmware - 
that went without a hitch as usual.

Soooo.....anybody have any ideas? Thanks. 73

Walter WB2IDK



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