I like the KPA100 as part of the two-box solution with the EC2. Looks like
the EC2 has been retired.
Lou W7HV
On Friday, July 2, 2021, 7:20:50 AM MDT, Frank Krozel <[email protected]>
wrote:
I also agree on the KPA100.
One box solution!
-73- Frank KG9H
[email protected]
> On Jul 2, 2021, at 8:07 AM, Bill Coleman <[email protected]> wrote:
>
> Go with the KPA100. It’s designed and integrated with the K2. Anything else
> is going to be a maybe-fit or have problems.
>
> Plus you get the RS-232 computer interface as well (although you have to use
> a special cable!)
>
>> On Jul 1, 2021, at 9:15 AM, jerry <[email protected]> wrote:
>>
>> All,
>>
>> So the K2 yielded up its first sideband QSO this evening. 10M roundtable of
>> the local ham club. People gave me good reports.
>>
>> The next step is to organize up some power. The KPA100 is a mighty elegant
>> package, but I'm having trouble getting my head around the price tag.
>>
>> An alternative might be one of those Chinese amp
>> kits off Ebay. I actually have one in hand. It requires a bit of redesign
>> to work well. Mostly,
>> going to a bifilar-transformer power feed and verifying/optimizing the input
>> and output turns ratios. And providing a proper switched LPF.
>>
>> - Jerry KF6VB
>>
>>
>>
>>
>>
>>
>>
>> On 2021-06-30 19:54, Bill Coleman wrote:
>>> 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 <[email protected]> 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-ASEL Mail: [email protected]
>>> Web: http://boringhamradiopart.blogspot.com
>>> Quote: "Not within a thousand years will man ever fly!"
>>> -- Wilbur Wright, 1901
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>
> Bill Coleman, AA4LR, PP-ASEL Mail: [email protected]
> Web: http://boringhamradiopart.blogspot.com
> Quote: "Not within a thousand years will man ever fly!"
> -- Wilbur Wright, 1901
>
> ______________________________________________________________
> Elecraft mailing list
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