This RF probe is useful for small RF power levels up through the microwave frequency bands, and simply connects to your DVM (Digital Volt Meter). The voltage shown will not be accurate, since this is a rectifier probe (diode probe), but the measurements are good enough for you to be able to determine where the RF stops, or if a stage is not giving the gain you think it should.RF Probe Schematic
RF Probe Notes:
- Maximal rated power is defined by 50 Ohm resistor (use more resistors connected in parallel) and maximal reverse voltage of diode. (for BAS70 70V)
- Compute output power from measured voltage:
Pout=(( Vmeasured + 0.35 V ) / 2^0.5 )^2 / 50
where:
Vmeasured is RF probe output voltage.
0.35 V is diode forward voltage (actual for BAS70)
/ 2^0.5 is peak to effective voltage
50 is load impedance
Source: RF Detector / RF Probe
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