Re: [Elecraft] Gentlemen, we have SSB! ( I think )

[Bill Coleman]

The K2SB was absolutely the hardest kit to build out of the entire K2. There 
are a lot of parts, and it is a very small board. 

> On Jun 30, 2021, at 10:06 PM, jerry  wrote:
> 
> So I got up at 5:30 this morning and continued stuffing the SSB adapter card. 
>  Finished it up this afternoon.
> 
> Trying it out, the CPU came up... CW still worked... But no SSB transmit, and 
> the SSB receive was very very soft.  Had to turn the AF gain up all the way 
> to hear
> anything at all.
> 
> My untutored diagnosis - something was wrong with that 7-crystal SSB filter.
> 
> So I pulled the card out, scrubbed it again with IPA, stuck it under the 
> microscope to look - again - for solder splashes and  cold joints.  Scraped 
> off a little something here & there.  Also, I had doubts about the 
> connections to the input & output transformers.  So I hit those again with 
> the soldering iron.
> 
> Put the card back in the K2 - and ...Wow!  Lively SSB receive!  RF out on 
> transmit!
> 
> Still need to align the rig.  Piping the output into another ham rig through 
> a big attenuator - it sounds pretty good.  One niggle - carrier suppression.  
> If it's nulled out for LSB, it's not for USB.  The nulls are in different 
> places on the pot.  I guess you set a compromise position, and make sure the 
> carrier is off the skirts of the filter, so that can help.
> 
>   - Jerry KF6VB
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Bill Coleman, AA4LR, PP-ASELMail: aa...@arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
   -- Wilbur Wright, 1901

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Re: [Elecraft] Gentlemen, we have SSB! ( I think )

[Don Wilhelm]

Jerry,

Yes, there is a bit of compromise between LSB and USB on the carrier 
null, but it should not be much.  Settle for a compromise position.


73,
Don W3FPR

On 6/30/2021 10:06 PM, jerry wrote:
So I got up at 5:30 this morning and continued stuffing the SSB 
adapter card. Finished it up this afternoon.


Trying it out, the CPU came up... CW still worked... But no SSB 
transmit, and the SSB receive was very very soft.  Had to turn the AF 
gain up all the way to hear

anything at all.

My untutored diagnosis - something was wrong with that 7-crystal SSB 
filter.


So I pulled the card out, scrubbed it again with IPA, stuck it under 
the microscope to look - again - for solder splashes and cold joints.  
Scraped off a little something here & there. Also, I had doubts about 
the connections to the input & output transformers.  So I hit those 
again with the soldering iron.


Put the card back in the K2 - and ...Wow!  Lively SSB receive!  RF out 
on transmit!


  Still need to align the rig.  Piping the output into another ham rig 
through a big attenuator - it sounds pretty good.  One niggle - 
carrier suppression.  If it's nulled out for LSB, it's not for USB.  
The nulls are in different places on the pot.  I guess you set a 
compromise position, and make sure the carrier is off the skirts of 
the filter, so that can help.


    - Jerry KF6VB


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