KX 1 WITH 20M PROBLEMS

[k1um]

Thanks to all that helped me with this 20m loss of T/R issue...

My final solution (after this groups' help and much schematic study and
rumination) was to remove K1 relay and replace it.  THIS IS NOT EASY amd I
almost sent it to Elecraft Tech support....

First You need to remove the capacitor soldered across K1 relay pins 2 and
        Then take a pair of side cutters and cut (and crunch) the relay down to the
circuit board (carefully!).
        Then take a desoldering tool - and without melting any of the very close
adjacent components like transistors,pots and several caps, melt, section
and suction away K1 and remove the remaining leads and solder...

NOTE: Removing K1 is made more difficult because I was talked into using
63/37 solder ("it is the industry standard"  HUMBUG!)and not my old favorate
(and hard to find) 60/40 which stays plyable and workable longer.  (this
reworkability is a big advantage, I have now discovered, to using 60/45)


Well I replace K1 and the jumpered cap and that was the problem. The board
survived; the rig works great; I got a few more gray hairs!!!

Thank you all again for the guidance and suggestions......

NOW to build the KX-1 antenna tuner


73 DE Ken K1UM

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[Paul Playford]

> NOTE: Removing K1 is made more difficult because I was talked into using
> 63/37 solder ("it is the industry standard"  HUMBUG!)and not my old
> favorate
> (and hard to find) 60/40 which stays plyable and workable longer.  (this
> reworkability is a big advantage, I have now discovered, to using 60/45)


Chip Quick is a low melting temperature solder and works well for removing
multi-pin components.  You apply the flux, glob on the solder, and it stays
molten for a long time as you remove the component.  Then you use solder
wick to clean up the solder from the board and alchohol to remove the flux.

Looks messy while in process but works very well.

Available at Fry's Electronics and Circuit Specialists, Inc.
(www.web-tronics.com)

Not cheap, but very effective.

de Paul, W8AEF

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