[Elecraft] K3 power switching.

[G4GNX]

I'm going to bring this up at the next discussion evening. We should be able 
to disable the voltage control pot, or replace it with a fixed resistor.

The guy in question is actually very knowledgeable, so it's just bad luck 
this time. Even if we'd 'fixed' the PSU, it may have developed the fault 
anyway.

73,

Alan. G4GNX

-----Original Message----- 
From: Robert Wood
Sent: Sunday, May 10, 2015 9:22 PM
To: 'G4GNX'
Subject: RE: [Elecraft] K3 power switching.

after the fact this is clear but we don't allow variable voltage power
supplies at club
too many fumble fingers with membership over 100 and no telling who shows up
at Field Day!!

73 W5AJ


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of G4GNX
Sent: Sunday, May 10, 2015 1:43 PM
To: Elecraft Reflector
Subject: [Elecraft] K3 power switching.

Following a mishap with a PSU, our local club's K3 is in need of repair and
I don't want anything similar to happen to mine.

The PSU is a linear device with a voltage control potentiometer and a meter.
The operator had an issue with the PSU which was showing an output of 15
volts; the K3 was connected and working. He switched off the PSU to
'exercise' the potentiometer and unfortunately turned it back on with the K3
still connected and switched on. The reading was still 15 volts, so he
touched the potentiometer again and the K3 started to emit smoke and died.
At this time, we're assuming that the PSU grossly over-volted.

My question: is the power switch on the K3 mechanical? If it is, then my
fears will not be realized because I ALWAYS turn on my PSU AND check the
output voltage on its meter before turning on the K3.

It will be interesting to find out what died in the K3. I hope it's not too
expensive.

73,

Alan. G4GNX
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