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4s6ggs RF Probe

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This configuration is made so that it's a simple detector to detect both positive and negative half of the RF signal. The resultant DC voltage will be peak to peak at C1 with respect to the input RF voltage

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4s6ggs RF Probe

  1. 1. RF PROBE 4S6GGS This configuration is made so that its a simple detector to detect both positive and negative half of the RF signal.www.4s5gs.gayan@gmail. com
  2. 2. RF PROBE This configuration is made so that its a simple detector to detect both positive and negative halfof the RF signal. The resultant DC voltage will be peak to peak at C1 with respect to the input RF voltage C1 – 0.001uF D1 – IN34A or similar Germanium diode Rx - 4.7 ohms. R = 4.7 Meg for Zin = 11-Meg; R = 4.3 Meg for Zin = 10-Meg; R = 430 K for Zin = 1-Meg . Rx For best accuracy, size the resistor to match your DC Voltmeters inputimpedance: The value of the resistor Rx The peak value is about 1.414 times the RMS voltage. Rx has to drop this excess voltage so themeter indication is accurate. If we know the input resistance of the meter, we can calculate the value ofRx as follows. 10,000,000 X 1.414 = 14,140,000Rx = 14,140,000 - 10,000,000 = 4,140,000 Ohms = 4.14 Meg Ohms4.7 meg ohms is the value chosen in all circuits since digital Multimeters have input resistance of 11 megohms. RF probe and the DMM resistance. This ratio is 10/(10+4.7) or .68 which is less than 5%from .707
  3. 3. RF PROBEThis RF Probe can use 1 - 400MHz
  4. 4. RF PROBE
  5. 5. RF PROBE
  6. 6. RF PROBEPower Meter Reading (dBm) Power (Watts) RF Probe Reading (Volts)-20 10u 0.002-10 100u 0.013-6 .25m 0.030-3 .5m 0.0510 1m 0.1007 5m 0.2708 6.4m 0.35011 12.5m 0.56014 25m 0.93017 50m 1.35020 100m 2.20026 0.4 4.50027 0.5 5.00030 1.0 8.00032 1.6 10.40033 2.0 11.00034 2.5 12.75036 4.0 14.50037 5.0 16.250
  7. 7. RF PROBE38 6.4 18.90039 8.0 20.30040 10.0 22.500

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