Posted by
jrueschenschmidt@t-online.de on
Jun 04, 2006; 10:34am
URL: http://elecraft.85.s1.nabble.com/K2-power-control-tp390511p390513.html
Don,
I checked the voltages during quick keydown.
U5 pin 5 2,5 V
U5 pin 7 2,5 V
U6 pin 3 2,5 V
U6 pin 6 0,06 V
It looks like U6 is killed. Pin 6 does not show 2,5 V during transmit. I
think I know what was happend ;-)
I soldered a new cable for my KAT100 tuner to extent the length. I
forgot to disconnect the AUX connector from K2 side. Pin 6 of U6 is
connected to pin 7 of the AUX I/O port.
I will replace U6 and test again.
73 de Joerg (DL3QQ)
-----Original Message-----
Date: Sun, 4 Jun 2006 04:30:01 +0200
Subject: RE: [Elecraft] K2 power control
From: "Don Wilhelm"
To: , "Elecraft"
Joerg,
You either have something wrong with the wattmeter in the KPA100 or have
something wrong in the path from the wattmeter forward power circuit to
the
VRFDET output from the KPA100.
During a quick keydown period (with only the base K2 powered or with the
PA
turned off in the menu), check the following points on the KPA100 (in
order)to determine at which point the voltage disappears - these should
all
be DC voltages - you should expect about 4 volts when the base K2 is
developing 10 watts or more:
U5 pin 5
U5 pin 7
U6 pin 3
U6 pin 6
U6 pin 6 is the KKPA100 output signal for the VRFDET line, and if you
have
voltage to that point, look for an open in the ribbon cable (pin 10).
73,
Don W3FPR
> -----Original Message-----
>
> I need some help. I can not adjust my power anymore when K2
is
> connected to the 100 W PA. The PA is overloaded and
power
> meter shows 200 watt !!!
>
> I tried to switch off PA in menu, but in this ca=e it is still
> running with maximum QRP power.
>
> I assume something goes wrong with VRFDET.
>
> If I disconnect th= PA from K2 power adjustment works fine.
>
> How could I investigate to find the reason for this fault ?
>
> 73 de Joerg (DL3QQ)
>
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