Mark,
When you have the problem, look at the voltage at P1 pin 6 (that is
VRFDET signal)?
If that is high, the MCU will limit power drastically.
Make sure Q1 is properly oriented. If that does not help, try a mod to
the KSB2 - reduce R9 to 1.5k and cut the trace between P1 pin 6 and the
Mark,
Pin 5 of U2 provides ALC threshold voltage to the emitter of Q1 on the KSB2
board. The 5.89 V you measured on Pin 5 suggests that the DAC input
register B didn't properly load the data word from the MCU. I would check
the solder joints on all U2 pins and Pins 14, 16 and 17 of the MCU
Today I finished the KSB2 adapter and installed it into my K2. It worked
first time but was intermittent. I found the issue as I had omitted to
solder the outer top pins of the twin three pin interconnects. That done
everything seems ok and then
No Apparent RF output. USB/LSB/CW Pressing
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