[Elecraft] KAT100 problems...

[jrueschenschmidt at t-online.de]

Hello Mike,

the problem sound familar to me. When i build KAT100 everything worked
fine for some hours. After a while same problem like you described
appeared on my KAT100. 

One relay click sounds a bit different and i could not match all bands
anymore. I thought a relay would be not okay, but the reason was a
defect in one of the small condensators connected to a relay. 

How i identified the component :

I turned ATU to Cal mode and meassured voltages on all 6B595 pins
connected to a relay. I found one voltage below power supply voltage.
After replacing the condensator it was working fine again.

It happends two times allready that a small condensator failed in my
KAT100.
 

73 de Joerg (DL3QQ)

-----Original Message-----
Date: Tue, 29 Nov 2005 16:36:02 +0100
Subject: [Elecraft] KAT100 problems...
From: "Mike Sexsmith" 
To: elecraft at mailman.qth.net


Hello all,

  I have a K2 setup (#4819) with the 100 watt tuner/amplifier in
separate 
EC2 enclosure. Things have been FB for 3-4 months, but recently while
using 
100 watts the tuner is unable to get below a 9.9 SWR on 80 meters, even 
though other bands tune fine. KAT100 Tuner also does not seem to
remember 
tune settings anymore when returning to a previously tuned frequency. It

will retune from scratch each time...  I rotated through the relays and
all 
seem to click ok, although the relay for 80 m seems to sound slightly 
different...When using just the base K2 separated from EC2 the KAT2
internal 
tuner works fine and remembers settings. Board parts placement and 
solderwork appears ok.

   Is the relay itself the most likely culprit, or should I be looking
at 
something else first?

Could someone please point me towards things to check in order of 
likelyhood? Thanks for any help!


Mike Sexsmith
W7MSX


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