[Elecraft] K2 initial impressions

[Don Wilhelm]

Many filters constructed using the newer crystals do not have that tilt, 
especially at narrow filter widths.
Wide filter widths do have both tilt and passband ripple.

Having aligned almost 2000 K2s, I can say this with certainty.

73,
Don W3FPR

On 6/25/2021 6:06 PM, Louandzip via Elecraft wrote:
>   The passband of the filter has a tilt (the SSB module's filter is much better)  When you switch between CW and CWR, the slope of the filter reverses with respect to the base band, so it sounds different.  It's not that unusual for other rigs to do this to a lesser degree.  Of course where the filter is centered depends on BFO alignment which must be done for each width and both USB and LSB.
>
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>      On Friday, June 25, 2021, 4:04:34 PM MDT, Don Wilhelm <don at w3fpr.com> wrote:
>   
>   Jerry,
>
> You will quickly get used to the UI.  If you do not have a manual,
> download one from Elecraft.
> As another 'helper' one of my friends who was just getting used to the
> K2 created a chart of all buttons with their functions as well as the
> menu.  You can download that chart from my website www.w3fpr.com.  Look
> near the bottom of the home page for the link to the chart.  If you
> print it, you can make it into a handy tri-fold that is a convenient
> 'accessory' to the K2.
>
> The CW/CW-R situation is definitely associated with the BFO frequencies.
> There are 4 filter widths for each mode and a BFO for upper sideband and
> another for lower sideband associated with each filter.
>
> I would wait until you have the KSB2 installed and do any upgrades that
> you want before trying to align the filters and their BFOs. If you
> change the RF board crystals, you will need to realign the filters and
> BFOs - likewise with the addition of the KSB2 option. The KSB2 option
> instructions give you some suggested settings, but you can do a lot
> better by running the K2 audio into an audio spectrum analyzer running
> on your computer - the visual display of the receive passband makes that
> task easy.
> You will need the internal counter probe if one was not included with
> your K2, Elecraft does sell a kit of parts.
>
> I can give you help with the Dial Calibration and Filter alignment.
>
> 73,
> Don W3FPR
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