[Elecraft] K2: power-on current spike

Mon Jan 5 19:19:00 2004

Hi Trent!
Just a shot in the dark.
Have you checked if the electrolyte capasitor C13 and C15 on =
controlboard is put in the right way?
They have enough capasitance to draw high current during chargeup if =
mounted the wrong way.
Hope I hit the spike here.
Enjoy.
Tom LA1PHA

----- Original Message -----=20
From: "Trent - KD7WUR" <[email protected]>
To: <[email protected]>
Cc: "Trent - KD7WUR" <[email protected]>
Sent: Monday, January 05, 2004 1:56 AM
Subject: Re: [Elecraft] K2: power-on current spike

> Thanks to those who responded (incl. Tom, Don, and Jim).
>=20
> I'm in the middle of phase 2 build-out, so I can't do powered-on tests =
just
> at the moment, but I've double checked everything mentioned (shorted =
power
> connector, reversed relay, diodes, electrolytic caps, etc.), and I am
> scouring the board for solder bridges.
>=20
> I doubt it's any of the major parts (reversed diodes and the like) or =
it
> would be a *continuous* problem (read "exhibited during normal =
operation,
> not just power-on").  It *could* be something relay-related since =
those are
> energized during the power-on reset sequence.
> Howdy All!
>=20
> I'm building up my K2 (what a delight[*] this kit is) and have been =
having
> problems with power-line fuses:
>=20
> Once powered up and running in Stage 1 tests/alignment, the rig runs =
0.06 -
> 0.10 A (depending on day/nite, dot/bar, etc. settings) which is =
exactly what
> the manual says to expect.
>=20
> However, the 2A fast-blow fuse I had in the power line (directly fed =
from a
> hefty 12V gel-cell) blew IMMEDIATELY the first time I tried to power =
up.  I