[Elecraft] K2 CW filter alignment

[Don Wilhelm]

Sam,

Do not ignore the DAC values, they are all on the high side of the 
carrier which indicates that they are on the wrong sideband - as you 
have it now, you will transmit 1.2 kHz (double your sidetone pitch) away 
from your received frequency!  You may enter those values into the CWr 
filters, because they should be on the high side of the filter center.

Setup with Spectrogram again and turn the vfo knob so the DAC values go 
lower.  You will see the passband go lower on the screen and then will 
reappear and then go higher in frequency again - you just shifted to the 
opposite sideband.  When the passband is positioned more or less like it 
was initially, that is the correct setting.

73,
Don W3FPR

Sam Morgan wrote:
> Morning all,
> I have a new (to me) K2 #2481 it has the KSB2 and KAF2 .
> When I check the software version it reads "2.01 H   1.02" first 
> question is:
> does that mean that I am running version 2.01 or 1.02 software?
> 
> I don't yet have the dead tree version of the manual(s), so I have been 
> spot reading the ones I found onlne.
> 
> I really didn't want to get into the in depth BFO alignment stuff yet 
> and am hopefully assuming it's on the correct side. My question arose 
> when I wanted to move the previous owners cw center frequency up from 
> 500hz to 600hz. Using the instructions I found on: 
> http://www.n0ss.net/k2_filters_using_gram_v5r17.pdf
> 
> Everything went well, the center frequency is now 600hz and the filters 
> look and sound nice and tight.
> Referencing page 8 of the above pdf I ran in to a problem, so it says. 
> The DAC in CW Normal does is not lower than the determined center 
> frequency value.
> 
> Then I read on page 9 and it says *if* the BFO is on the wrong side, 
> (which the DAC readings would seem to indicate), one or more filter 
> setting would show a shift of the center freq and be more than 200hz 
> off. All the filter settings are dead on, no vfo changes needed when 
> cycling thru the 4 settings.
> 
> SO what's the deal here, do I ignore the DAC readings?
> Bandwidths used are 1400, 800, 400, 100.
> 
> Center freq DAO                              CW Normal DAO
> 142                                                   157
> 135                                                   154
> 130                                                   152
> 128                                                   151
> 
> Ah the joys of a rig you can actually work on, heheheh.
> TIA
>