[Elecraft] KAT100 General Failure

[Don Wilhelm]

Johnathan,

Since the KAT100 is not recognized in the K2 menu, you either have a 
problem with the KAT100 firmware, but do check the cable for continuity 
of the AUXBUS signal that is used to communicate among the various 
pieces of firmware ICs throughout the K2 system.

Since the KAT100 has not been in service for a while, it may be that 
there is oxidation on the KAT100 firmware IC pins.  Removing and 
reinserting the firmware IC may bring it back to life by wiping away any 
oxidation on the pins.

As for the LEDs, that is also controlled by the firmware IC, so fix the 
firmware problem first, and then you can find any problems that remain.

73,
Don W3FPR

On 1/3/2020 11:13 PM, Jonathan Taylor, K1RFD wrote:
> I am testing my KAT100, which had been sitting idle for a number of
> years.  It is connected to the K2/100 via the DB9 cable as described
> in the KAT100 manual.  The two are interconnected with a coax cable
> and Ant1 is connected to a dummy load.
> 
> 1. Apply power to KAT100.
> 2. Turn on K2/100.
> 3. Almost immediately, all LEDs on the SWR bar graph illuminate, the
> S-meter bar graph on the K2 goes full scale, and both remain in this
> state.  The receiver is silent. (There is no indication of any output
> power, as if it were transmitting.)
> 
> Pressing the ANT1-2 button on the K2 produces the "not inst" message.
> Turning off the K2 power, all LEDs on the KAT100 remain illuminated.
> With KAT100 powered off, K2 functions normally.
> 
> I have verified the wiring of the DB-9 cable.  What's the next best
> thing to check?
> 
> Thanks
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