Jonathan,
That is a great discovery. Yes, if U5 was getting hot it would be
dragging down the 5 volt supply and causing U1 to not function.
73,
Don W3FPR
On 1/4/2020 12:18 PM, Jonathan Taylor, K1RFD wrote:
Don,
Z1 is resonating away, but in the course of verifying that, I noticed
that the
Don,
Z1 is resonating away, but in the course of verifying that, I noticed
that the U5 op-amp was getting hot to the touch. I replaced it, and
now all is working normally. Perhaps it was loading down the 5V
supply excessively.
I'm guessing that U5 made the ultimate sacrifice in the same
Jonathan,
Yes, replacing KAT100 U1 would be the prudent first step. But if you
can, first determine if the resonator Z1 is providing clock pulses to U1
pins 13 and 14. Without those clock pulses, U1 will not be functional.
If you have a local ham who also has a KAT100, see if you can swap
Thanks Don.
I had the same thought about U1, but unfortunately the symptoms remain
after re-seating it a couple of times.
Regarding AUXBUS, I believe continuity is good, since a logic probe on
the KAT100 side shows activity when certain K2 controls are
manipulated such as Power, Tune, and Band.
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
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.
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