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Technical content
The data should be read in conjunction with the Magnetron Preamble.
DESCRIPTION
Compact, rugged, lightweight, fixed frequency pulse magnetron, designed for marine radar applications. GENERAL DATA Electrical Cathode pre-heating time (minimum) Temperature coefficient of frequency ....s e e note 4 Mechanical (22.86 x 10.16 mm internal) A minimum clearance of 25 mm must be maintained between the magnetron and any magnetic materials. MAXIMUM AND MINIMUM RATINGS (Absolute values) These ratings cannot necessarily be used simultaneously, and no individual rating should be exceeded. Min Max Input power (mean) (see note 5) . . . – 100 W Rate of rise of voltage pulse TYPICAL OPERATION Operating Conditions Typical Performance # e2v technologies (uk) limited 2016 A1A-MG5436 Issue 7 June 2016 e2v technologies (uk) limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU, UK Telephone: +44 (0)1245 493493 Facsimile: +44 (0)1245 492492 e-mail: enquiries@e2v.com Internet: www.e2v.com Holding Company: e2v technologies plc MG5436 X-Band Magnetron
TEST CONDITIONS AND LIMITS The magnetron is tested to comply with the following electrical specification. Test Conditions Oscillation 1 Oscillation 2 Rate of rise of voltage pulse (see note 6): Limits Min Max Min Max MG5436, page 2 # e2v technologies LIFE TEST The quality of all production is monitored by the random selection of tubes which are then life-tested under Test Conditions Oscillation 1. If the tube is to be operated under conditions other than those specified herein, e2v technologies should be consulted to verify that the life of the magnetron will not be impaired. End of Life Criteria (under Test Conditions Oscillation 1) NOTES 1. For optimum performance a value of 6.3 V is recommended. However, this magnetron will work satisfactorily within the specified limits. The magnetron heater must be protected against arcing by the use of a minimum capacitance of 4000 pF shunted across the heater directly at the input terminals; in some cases a capacitance as high as 2 mF may be necessary depending on the equipment design. For further details see the Magnetron Preamble. 2. Measured with heater voltage of 6.3 V and no anode input power, the heater current limits are 0.5 A minimum, 0.6 A maximum. 3. For ambient temperatures above 0 8C. For ambient temperatures between 0 and755 8C, cathode pre-heating time is 90 seconds minimum. 4. Design test only. The maximum frequency change with anode temperature change (after warming) is 70.25 MHz/8C. 5. The various parameters are related by the following formula: Pi = i apk xv apk xD u where Pi = mean input power in watts iapk = peak anode current in amperes vapk = peak anode voltage in volts and Du = duty cycle. For mean pulse input power greater than 45 W the heater voltage must be reduced within 3 seconds after the application of HT according to the following schedule: V h = 0.08 (1107 Pi) volts where Pi = mean input power in watts. 6. Defined as the steepest tangent to the leading edge of the voltage pulse above 80% amplitude. Any capacitance in the viewing system must not exceed 6.0 pF. 7. The maximum rate of rise of voltage for stable operation depends upon detailed characteristics of the applied pulse and the pulser design. The specified maximum rating applies to typical hard tube pulsers. For minimum starting jitter and optimum operation, the recommended rate of rise of voltage for most line type pulsers is from 60 to 90 kV/ms. 8. Tolerance + 40%. 9. Other frequency ranges can be supplied on request. 10. With the magnetron operating into a VSWR of 1.15:1 over a peak anode current range of 6.0 to 10 A. Pulses are defined as missing when the RF energy level is less than 70% of the normal energy level in a 0.5% frequency range. Missing pulses are expressed as a percentage of the number of input pulses applied during a two minute period of observation. 11. Measurements taken ‘as read’ using suitably calibrated equipment.
PEAK ANODE VOLTAGE (kV)PEAK OUTPUT POWER (kW) PEAK ANODE CURRENT (A) PEAK CURRENT RATING LIMITS MAXIMUM TYPICAL MINIMUM TYPICAL MINIMUM 7102 PERFORMANCE CHART HEALTH AND SAFETY HAZARDS e2v technologies magnetrons are safe to handle and operate, provided that the relevant precautions stated herein are observed. e2v technologies does not accept responsibility for damage or injury resulting from the use of electronic devices it produces. Equipment manufacturers and users must ensure that adequate precautions are taken. Appropriate warning labels and notices must be provided on equipments incorporating e2v technologies devices and in operating manuals. High Voltage Equipment must be designed so that personnel cannot come into contact with high voltage circuits. All high voltage circuits and terminals must be enclosed and fail-safe interlock switches must be fitted to disconnect the primary power supply and discharge all high voltage capacitors and other stored charges before allowing access. Interlock switches must not be bypassed to allow operation with access doors open. RF Radiation Personnel must not be exposed to excessive RF radiation. All RF connectors must be correctly fitted before operation so that no leakage of RF energy can occur and the RF output must be coupled efficiently to the load. It is particularly dangerous to look into open waveguide or coaxial feeders while the device is energised. Screening of the cathode sidearm of high power magnetrons may be necessary. X-Ray Radiation High voltage magnetrons emit a significant intensity of X-rays not only from the cathode sidearm but also from the output waveguide. These rays can constitute a health hazard unless adequate shielding for X-ray radiation is provided. This is a characteristic of all magnetrons and the X-rays emitted correspond to a voltage much higher than that of the anode. # e2v technologies MG5436, page 3
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(All dimensions without limits are nominal) Ref Millimetres A 113.0 max B 41.53 max C 36.0 max D 86.0 max E 10.0 min F 3.33 max G 240.0 min H 52.5 max J 30.0 max K 21.5 max L 4.52 max 4.37 min M 87.95 N 4.39 max 4.24 min P 20.2 max Q 5.15 + 0.10 R 15.5 S 5.00 min T 16.26 Lead Connections Colour Element Green Heater Yellow Heater, cathode Outline Notes 1. The mating surface of the magnetron baseplate will be flat to within 0.20 mm. 2. Positional tolerance of holes +0.2 mm with respect to waveguide aperture. Printed in EnglandMG5436, page 4 # e2v technologies Whilst e2v technologies has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also reserves the right to change the specification of goods without notice. e2v technologies accepts no liability beyond that set out in its standard conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein.