How much damage is done partially depends on the hardware mod version of
your K2. The "B" mods includes some modifications that should limit some
of the most serious damage, like blowing up the main processor of your
K2. There is a document somewhere that describes what damage a K2
suffers because of this; it's a long list
Apologies for replying to my own post - didn't want Dave to sustain any
more damage! - but for those who have done the unthinkable and connected
a regular RS232 device to KIO2,
https://folk.universitetetioslo.no/sverre/LA3ZA/blog/K2/N0SS/k2_wrong_ser_cbl_damage.pdf
should be helpful information.
Step 10 of the K2 "Upgrading the elecraft K2 to revision B" document on
the Elecraft website has a valuable step that I missed when I did other
upgrades.
BTW, if your K2 is the 10W version, you don't use the RS232 port and you
don't have the "K2 amplifier keying circuit" that can be found on the
Elecraft website, it is possible to put that circuit inside a DE9
connector hood: have a DE9-M connector that plugs in the KIO2, and a
cable to key your amplifier. I added another transistor to switch a
small LED so that the connector now lights up when the K2 is
transmitting. I use this to key a chain of transverters for the QO100
satellite. And it avoids drilling a hole for the PTT key plug.
73,
Geert Jan
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