[Elecraft] KPA100 problem

Sun Jan 19 13:14:00 2003

Hi Don

If you changed the firmware for the KAT100 and you got the INFO 201 message
then all of your settings will need to be reset. This is because some of the
look up tables were moved to the IOC IC to save space in the MPU. This
required a hard reset so all of the factory defaults are loaded when first
powered on.

It sounds like the cal temp is not set up right. Q3 is the temperature
sensor. If you used lock washers on the mounting screws they may have
cracked the case on the transistor. I usually use a fiber washer on the
screw so the lock washer does not dig into the transistor case. Anyway it
would be a good time to check the screws on Q1 and Q2 to see if they need
tightening. Another thing you may want to do is set R27 20% higher than R26
per the instructions in the KAT100. Measure the resistance from groung to
the wiper of R26 and set R27 20% higher on its wiper.

Don Brown
KD5NDB

----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Sunday, January 19, 2003 11:29 AM
Subject: [Elecraft] KPA100 problem

> For the last couple of days when I power up my K2/100, the fan begins
running
> immediately, and when I attempt to key the xmtr at more than 10 watts out,
I
> get a PA hot report as well as high swr.  This is into a resonant antenna.
> The problem occurs when the heat sink is cold to the touch.  When I bring
up
> CAL tpa on the menu, the heat sink temp shows very high readings.  I
recently
> changed out the firmware for the KAT 100.  Do I need to do another temp.
> calibration?  If so, do I need to reset R6 fully counter-clockwise?
Thanks
> in advance for any suggestions.
>
> 73,
>
> Don W5EI
>
>
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