For those wanting to build a post 3000 SN K2 to the latest level without going through the interim steps of building as instructed FIRST and THEN adding the changes to bring it up to level... You already have a Rev E manual - go to the Elecraft website and download the REV F manual and print pages 20, 49, 52, 54, 56 and page 110. You may want to print the schematics and parts list too, but not mandatory.
If you don't have the keying waveshape mod instructions already, download that too and print page 3. Now make the following modifications to your Rev E manual: 1) Following page 19 - add the sheet from page 3 of the keying waveshape mod (do only the 1st instruction step from the mod page - the rest of the steps are covered on the Rev F manual page) and insert page 20 from the Rev F manual. (this is the major part of the keying waveshape change) 2) Page 47 of the Rev E manual Last step of the 2nd column, delete RP3 and replace it with the steps on page 49 from the Rev F manual. (this adds the thermistor board for the PLL stability mod). 3) Page 49 of the Rev E manual (last step) - delete this step and do the steps shown on page 52 from the Rev F manual - NOTE the trace indicated in step 1 will NOT be cut on your RF board, so make this cut. (This adds C88, RFC15 and C91). 4) Page 54 of the Rev E manual next to the last component - change D36 from a 1N4007 to a 5082-3081 (fragile glass diode) - this completes the keying waveshape change. 5) Replace page 56 of the Rev E manual with the contents of page 59 from the Rev F manual (this adds the strong signal handling changes). 6) - optional - Replace page 110 of the Rev E manual with the contents of page 113 from the Rev F manual. 7) - optional - Replace the parts list and the schematic pages of the Rev E manual with the parts list and schematic information from the Rev F manual. Now you have the instructions to build a K2 to the latest level - Happy Building. In addition to the K2 kit you have in hand, you will need parts from the PLL temperature stability mod kit, the keying waveshape mod kit, a 68 pf capacitor for C88, a 100uH minature choke for RFC15, a .001 capacitor for C91 and 2 - 1N4148 diodes for D40 and D41. You should compare the Rev E manual with the Rev F manual and verify for yourself that I have not missed anything. All I can say is that I have gone through these steps for a customer with an unbuilt 37xx SN K2 and everything performed as advertized. The firmware levels needed to support these changes are MCU 2.04p or above and IOC 1.09 and above. Of course, another way to approach it (the safe way) is to build to the Rev E manual with the errata that was shipped with your kit and then apply the changes after it is built according to the instructions for each change. In either case you will end up with a current level K2. Other than the 2 trace cuts that are being made at the factory, the boards are the same. 73, Don W3FPR _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
