> my probe using diode on scope probe tip

The problem is the very poor impedance match and coupling, not the diode.
There is another version of the same probe that uses a closed loop
(crocodile clamp to ground of probe. It can have 1 or more turns. This is
usefull in testing RFID systems and such (at low frequency). You can test
the straight probe quickly using a cellular phone. 1N23 is a microwave
germanium diode. The closed loop probe can be tested with a computer
monitor or tv (it picks up the field from the deflection yoke 1-2 meter
away). The probes are useful for seeing modulation and for snooping for
heavy rf leakage. Both probes pick up 50Hz mains hum and requre some
care to avoid that.

Peter

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