RF Trap With Attenuator Calculator

Calculates the attenuation, 'impedance', reflection coefficient, VSWR and return loss of a circuit that incorporates a RF tank circuit into a Pi attenuator. Preferred resistor values are entered into the text boxes, similar to the way that values for a prototype may be selected. Values for the tank circuit may be selected with the Tank Circuit Resonant Frequency Calculator. A FLEXI-BOX is available with a dedicated PCB for this circuit and there is a selection of connectors. This is supplied as a kit, or as a ready built RF Trap With Attenuators

[circuit diagram]

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The calculator uses simple Ohms law formulas, and more comprehensive formulas for Voltage Reflection Coefficient and VSWR which are available at:-

http://www.spectrum-soft.com/news/fall2009/vswr.shtm

This calculator is provided free by Chemandy Electronics in order to promote the FLEXI-BOX

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Characteristic impedance of the system:	Ohms	Attenuation:	dB
Enter the value of R2/R3 resistor:	Ohms	Impedance:	Ohms
Enter the value of R1/R4:	Ohms	VSWR:
		Reflection Coefficient:
		Return Loss:	dB