Hi Don...

Well,  so far I'm pretty certain I did the A > B changes,  and I did do the IF and the SSB crystal and cap filter mods.  I'll be reading thru that again,  in my first look I got the impression there might have been a later, better, version of the Xtals? Wasn't sure.   PSK was just starting out, and I recall doing the IMD improvement change. (What ever happened to PSK-31 and keyboard ragchew contacts, anyway?  Ooops, don't want to start anything...)


Finally building and using the KIO2 is pretty slick,  have been running WSJT-X and monitoring some WSPR and FT8,  kinda cool to have computer control of the rig, watch it do auto bandswitching while collecting WSPR spots.  I still have to find the spare mic connectors I used to have handy and build the TX half of the cabling.  Don't worry K9YC,  there will be #31 ferrite involved...   And, I'm pretty sure I did the Pin 1 issue mods, grounding the mic shell and headphone jack solidly...

OK, the AT issue sounds like it happened after my board.  And, someday I might get the KPA100 and do the two box setup, so the KSB2 FW update is something to remember.

I know I used to have my S/N in posts here... kinda surprised I haven't been able to find a single post of mine,  going back thru the reflector site archives. I had the kit around 2000,  would think I was chatting away into 2001 or longer,  where the archive ends.  I dont see any easier search method than opening a month at a time though,  might be missing them.  Anyone know if there's a more comprehensive search method?  My S/N was in the 1500's,  if I remember right...

Definitely need to go thru my filters,  had been tweaking them a bit,  not in the way you're supposed to,  and I know they're not right now.  Have a few audio spectrum programs that we wish we had back then,  so will be doing a full filter setup/alignment shortly.

Jon, KA6MOK  K2 #????


On 4/12/2018 6:35 AM, Don Wilhelm wrote:
Jon,

I don't think the serial number information for older K2s is still available from Elecraft.

As for the upgrades, I suggest you download the instructions for the K2 A to B upgrade.  That is only the basic upgrade.  The 1st page of the instructions lists several other upgrade kits. Download the instructions for each of them to determine which (if any) have been installed on your K2.  Installing all of them will give you a K2 that is almost equal to a new K2.

In addition, changing the IF crystals to the current crystals will improve the filters on your K2.  If you have the KSB2 board, change those crystals as well - Elecraft sells a set of 14 matched crystals for the K2 and KSB2 as well as a set of 7 for the base K2 only. While you have the crystals off the KSB2 board, it is easy to change the filter capacitors to extend the filter bandpass from the original 2.1kHs to the new 2.4kHz - the capacitor kit is SSBCAPKT.

As far as firmware, upgrade the MCU and KIO ICs to the new version.  The only other firmware upgrade that is needed may be the KSB2 which should be upgraded if you ever add the KPA100.

The KAT2 wiring change was only valid for a short run of boards when the vendor printed the boards upside-down.

Download the KSB2 PSK mod instructions to see if you have the updated resistor and capacitor changes - if not, change them.

If all that is done, your K2 will perform like a new one.

73,
Don W3FPR

On 4/12/2018 2:28 AM, Jon wrote:
Hello all!

Long time no mailing list...   I have a nice, vintage K2,  that I want to spruce up, tune up, and bring back to it's full MOJO.   Kind of a it's not dead yet,  it's just resting. Actually, it's been in use, off and on over the years,  am now getting more serious about plying the airwaves.

Been looking over the various places of K2 lore, for updates and so forth,  Sverre's site, Don's, and of course the Elecraft site.

First order of business ,  is it possible to have my S/N looked up? Found a database that I don't seem to be in,  found that the Elecraft list archives go back to 2001,  but I'm not finding a post of mine in there,  so hopefully the Elecraft Records Repository would still contain it somewhere. Then I can proudly post it on the bottom of my mails, like it was done back in the day.  ;-)

Next,  I have a range of boards for it, the NB, SSB, Antenna tuner, 160m antenna, and just built my long languishing KIO2 kit, to bring this K2-10 into the 21 (20th?) century.   I have started to go thru them and see if I have all the mods and etc that should be done on them,  have done many already,  but back about '03-04.  Guess this is just a matter of looking things up,  though I have a few questions there and probably will have more.

Another next,  I've been having difficulty checking to see which versions of firmware are the latest,  and what the various versions add.  Is there a version change log or something like that?

Here's what I have so far,  looks like the two main ones are down a bit,  but I don't know what I'm missing,  or if I really need the updates.

MCU    2.01f
RF        1.02
KSB2    1.04
ATU     1.03 f

Here's the PCB versions marked on the boards:

Main     rev A
Control rev A
ATU     rev C (note, the board does NOT match the picture of the recent note stating some cut and jumper rework should be done on a rev C)
NB and 160m  rev D
SSB    don't have,  will have to yank it to read

So, the beginning of a journey.   Will greatly appreciate whatever tips and directions I could be pointed in.

Jon - KA6MOK   K2 #????
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