[Elecraft] K2 initial impressions

[jerry]

Just for yuks, I opened it up to see....what if the SSB adapter had been 
installed,
and somebody pulled it out?

    Sure enough, C167 was tacked messily to the top of the board.  
According to the
schematic, you remove that when you install the SSB adapter.

   That's good news.  It means I just build the adapter, remove messily 
tacked-on C167,
plug the adapter in, and align.  Don't have to take the front panel 
apart.

...or so I hope.

                    - Jerry KF6VB


On 2021-06-25 15:24, Don Wilhelm wrote:
> 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.
>> 
>> 
>> 
>> 
>>      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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