[Elecraft] K1: Eleven pre-newbie queries

[Lloyd Lachow]

What will I need to power my K1 - can I use a wall
wart? What's the connector needed for the jack on the
rig? What's the optimum VDC? Will anything between
9-15 V work equally well? Will there be any hum from
using a wart versus batteries? What is needed to hook
up external batteries?
Is there an adjustment for weight in the keyer
circuit? 
The rig I'm getting is set for 150kHz bandwidth. I
would have chosen 80 kHz; is there enough of a
difference in the tuning to make it worth swapping out
the capacitor?
I've got a 90' wire that goes up into my attic that
I've been using with my HW-7. Using a tuner, I can get
a 1:1 SWR on 40, 20 and 15. Can I expect the same
performance with the KAT1 in this rig?
Finally, does anyone out there have a spare, unbuilt
KFL1-4 they'd like to sell, or one that's built with
40-30-20-15? Thanks! 73/72, N3WSH

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