**A. Calculate 2 Resistor Voltage Divider Bias**

Enter Voltage: Enter R1: Enter R2: Bias voltage =

**B. Calculate Inductive Reactance**

Enter Inductance in uH: Enter Freq in MHz: XL (ohms) =

**C. Calculate # of Turns To Obtain a Desired Inductance on a Ferrite Toroid**

Enter Inductance in millihenries: Select Core: Turns =

The

*AL for this ferrite core is*=

**D. Calculate Cut off Frequency for an RC Pi Low-Pass Filter**

Enter resistor value in ohms: Select capacitor values in uF:

3 dB down frequency (Hertz) =

**E. Calculate Power in dBm and mW from Peak-to-Peak Voltage**

Enter measured peak-to-peak voltage into a 50 ohm load: dBm, mW

Application Note: This web site follows the EMRFD standard for dBm power measurement. dBm = the power delivered into a 50 Ohm resistive load which is temporarily substituted at that point in the signal chain.

**F. Calculate Lm and Cm For a Crystal using the G3UUR Method**

Enter frequency in

**MHz**written on crystal (series resonant frequency):

Enter measured frequency in

**MHz**with switch open: Enter measured frequency in

**MHz**with switch thrown:

Enter crystal capacitance in

**pF**: Enter open switch circuit capacitance in

**pF**:

**Cm**= femto Farads ,

**Lm**= Henries

**G. Calculate Decibel Power Gain or Loss from 2 Peak-Peak Voltages**

Enter voltage 1: Enter voltage 2 dB gain or loss =

**H. Calculate Decibel Power Gain or Loss from Input and Output Power**

Enter input power in watts: Enter output power in watts dB gain or loss =

**I. Calculate dBm and mW from RMS Voltage (50 ohms)**

Enter RMS voltage dBm mW

**J. Calculate Return Loss and VSWR (50 Ohms Detector)**

Enter the detector signal in pk-pk volts when the unknown port is terminated in an open circuit:

Enter the detector signal in pk-pk volts with the ? impedance connected:

Return loss = dB, VSWR=1: Measurements per Figure 7.41 EMRFD.

**K. Calculate Power from the DC Output of an AD8307 Meter**

**1. Linear calibration steps:**

Enter measured DVM voltage at -10 dBm: Enter measured DVM voltage at -20 dBm:

**2. Calculate power in dBm from DVM voltage:**

Enter measured DVM voltage: Power =

**L. L-C-C Tee Network**

Enter

**frequency**in MHz:

Enter

**R1**in Ω: Enter

**R2**in Ω:

*R1 must be < R2, but the network is bi-directional*

Enter Q:

*Perhaps start with 2-5*

C1 = pF, C2 = pF, L = uH

**M. Parallel Resistor Values**(2-4 resistors) [ also may use for series caps etc. ]

Enter R1: Enter R2 Enter R3: Enter R4:

R = ohms

**N. LCR -- a Reactance Calculator**In beta -- do not use !

Mode: Inductance: Enter frequency in MHz