RF Electronics & Analysing the Magnetron Drive Circuit
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This solution deals with the analysis of a given Magnetron Drive Circuit to derive the circuit characteristics as applied to a resulting Radar pulse. Circuit parameters are given including Delay Line parameters and from this such things as the number of turns on the secondary winding of the drive transformer, the pulse period and duration, DC input power requirements and outgoing RF pulse power are derived.
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Solution Summary
This solution deals with the analysis of a given Magnetron Drive Circuit to derive the circuit characteristics as applied to a resulting Radar pulse. Circuit parameters are given including Delay Line parameters and from this such things as the number of turns on the secondary winding of the drive transformer, the pulse period and duration, DC input power requirements and outgoing RF pulse power are derived.
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Determination of circuit parameters for a Magnetron Drive Circuit - RF Electronics
PROBLEM:
A Magnetron Drive Circuit is described by the circuit shown in Figure 1. In addition the said Magnetron has the following circuit parameters defined.
Magnetron Definition parameters:
Input impedance of Magnetron (ZMAG ) = 625 Ohms
DC to RF conversion efficiency of Magnetron (Eff (DC-RF) ) = 75 % = 0.75
Magnetron Drive circuitry definition:
{SEE ATTACHMENT FOR CIRCUIT DIAGRAM}
VS = 1 kV, LCH = 3.12 H, L = 160 nH, C = 260 pF, no. sections in LC delay
line n = 20
Figure 1: A Magnetron Drive Circuit
(Q1) Determine an estimate for the required number of turns (N) on the secondary of
the transformer.
(A1) Theory states that the output impedance as seen by the transformer (in this case
the input impedance of the Magnetron) is given as the input impedance (in this
case the delay line impedance) multiplied by the transformer turns ratio squared. ...
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