John,
The diode drop is likely the primary culprit. If you must use a series
diode, use a Shottky diode (like a 1N5711) and not a silicon diode (like
a 1N4148).
The key input goes to a microprocessor digital I/O pin inside the
KXPA100, and a diode drop - especially with a significant series
resistance -- puts the detected voltage in the indeterminate region.
73,
Lyle KK7P
So, I got my KXPA100 kit and have assembled it. But I'm having trouble
keying it with my transceiver ...There is a 560 ohm resistor in series
internally, along with diodes...
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