MG4004

X-Band Magnetron

The data should be read in conjunction with the Magnetron

Preamble.

ABRIDGED DATA
Compact, rugged, lightweight, fixed frequency pulse
magnetron with very low levels of unwanted emissions.
Operating frequency ...................................... 9410 ± 30 MHz
Typical peak output power .......................................... 4.0 kW
Magnet ....................................................................... integral
Cooling............................................... conduction and natural

GENERAL
Electrical
Cathode ....................................................... indirectly heated TYPICAL OPERATION
Heater voltage (see note 1) ........................................... 6.3 V
Operating Conditions
Heater current at 6.3 V (see note 2) ............................ 0.55 A
Cathode pre-heating time (minimum) Heater voltage (for operation) ............................. 6.3 V
(see note 3) ............................................................... 60 s Anode current (peak) .......................................... 3.0 A
Input capacitance ................................................. 8.0 pF max Pulse duration ..................................................... 1.0 µs
Temperature coefficient of frequency ................... see note 4 Pulse repetition rate ...................................... 1000 pps
Frequency stability under mechanical shock ........ see note 5 Rate of rise of voltage pulse ............................. 40 kV/µs

Mechanical Typical Performance

Overall dimensions ............................................... see outline Anode voltage (peak) .......................................... 3.7 kV
Net weight ......................................................... 250 g approx Output power (peak) ........................................... 4.0 kW
Mounting position ............................................................. any Output power (mean) .......................................... 4.0 W
Output ........................................................ no. 16 waveguide
Coupler ............................................ IEC UBR/PBR/CBR 100
A minimum clearance of 25 mm must be maintained TEST CONDITIONS AND LIMITS
between the magnetron and any magnetic materials.
The magnetron is tested to comply with the following
A clearance of at least 50 mm is needed to prevent mutual electrical specification.
attraction between magnetrons when removed from
protective packaging. Test Conditions
Heater voltage (for test) ...................................... 6.3 V
Cooling ............................................. conduction and natural Anode current (mean) ......................................... 3.0 mA
Duty cycle ........................................................... 0.001
MAXIMUM AND MINIMUM RATINGS Pulse duration (see note 9) ................................. 1.0 µs
(Absolute values) VSWR at the output coupler ............................... 1.15:1 max
Rate of rise of voltage pulse (see note 7):
These ratings cannot necessarily be used simultaneously, using hard tube pulser ............................... 100 kV/µs min
and no individual rating should be exceeded. alternatively using line type pulser............... 50 kV/µs min
Min Max
Heater voltage (see note 1) ...........................5.7 6.9 V Limits
Heater starting current (peak) ........................ - 3.0 A Min Max
Anode voltage (peak) .....................................3.4 3.9 kV Anode voltage (peak) (see note 10) .............. 3.4 3.8 kV
Anode current (peak) .....................................2.0 4.0 A Output power (mean) .................................... 3.5 - W
Input power (mean) (see note 6) .................... - 25 W Frequency (see note 11) ......................... 9380 9440 MHz
Duty cycle ...................................................... - 0.0025 RF bandwidth at ¼ power
Pulse duration ................................................ - 2.5 µs (see note 12) ............................................ - 2.5 MHz
Rate of rise of voltage pulse Frequency pulling (VSWR not less
(see notes 7 and 8) .................................. - 100 kV/µs than 1.5:1) (see note 12) .......................... - 30 MHz
VSWR at the output coupler .......................... - 1.5:1 Stability (see note 13) .................................... - 0.1 %
Anode temperature .................................... -55 120 °C Heater current ....................................................... see note 2
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 the 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.

e2v technologies (uk) limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU United Kingdom Holding Company: e2v technologies plc
Telephone: +44 (0)1245 493493 Facsimile: +44 (0)1245 492492
Contact e2v by e-mail: enquiries@e2v.com or visit www.e2v.com for global sales and operations centres CR 123197

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LIFE TEST

The quality of all production is monitored by the random

selection of tubes which are then life-tested under the above
Test Conditions. 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 the above Test Conditions)

Anode voltage (peak) ......................................... 3.4 to 3.9 kV
Output power (mean) ............................................. 3.4 W min
RF bandwidth at ¼ power ................................. 3.5 MHz max
Frequency ................................................. 9350 to 9440 MHz

NOTES
1. No reduction of heater voltage is required at any value of 7. Defined as the steepest tangent to the leading edge of
mean input power. For optimum performance a value the voltage pulse above 80% amplitude. Any
within the specified ratings must be maintained. capacitance in the viewing system must not exceed 6.0
pF.
The magnetron heater must be protected against arcing
by the use of a minimum capacitance of 4000 pF 8. The maximum rate of rise of voltage for stable operation
shunted across the heater directly at the input terminals; depends upon detailed characteristics of the applied
pulse and the pulser design. The specified maximum
in some cases a capacitance as high as 2 µF may be
rating applies to typical hard tube pulsers. For minimum
necessary depending on the equipment design. For
starting jitter and optimum operation, the recommended
further details see the Magnetron Preamble.
rate of rise of voltage for most line type pulsers is from
2. Measured with heater voltage of 6.3 V and no anode 30 to 50 kV/µs.
input power, the heater current limits are 0.5 A minimum,
0.6 A maximum. 9. Tolerance ± 10%.
3. For ambient temperatures above 0 °C. For ambient 10. Measurements taken ‘as read' using suitably calibrated
equipment.
temperatures between 0 and -55 °C, cathode pre-
heating time is 75 seconds minimum.
4. Design test only. The maximum frequency change with 11. Measured at factory ambient. Anode temperature 40 °C
anode temperature change (after warming) is -0.25 approx.
MHz/°C.
5. Design test only. No permanent frequency shift will occur 12. Design test only.
when the magnetron baseplate is subjected to an
impulse of peak acceleration ≤50 g for 2 ms in any
direction. 13. Design test only. With the magnetron operating into a
VSWR of 1.15:1 over a peak anode current range of 2.0
6. The various parameters are related by the following to 4.0 A. Pulses are defined as missing when the RF
formula: energy level is less than 70% of the normal energy level
Pi = iapk x vapk x Du in a 0.5% frequency range. Missing pulses are
where Pi = mean input power in watts expressed as a percentage of the number of input
iapk = peak anode current in amperes pulses applied during a two minute period of
vapk = peak anode voltage in volts observation.
and Du = duty cycle.

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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.

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PERFORMANCE CHART

© e2v technologies (uk) limited 2016 Document subject to disclaimer on page 1 A1A-MG4004 Version 12, page 4
OUTLINE (Not for inspection purposes)
(Dimensions without limits are nominal)

Ref Millimetres
A 73.0 max
B 42.0 max
C 40.0 max
4.39 max
D
4.24 min
4.52 max
E
4.37 min
F 15.5
G 5.2
H 16.26
J 21.0 max
Outline Notes K 43.74
L 240.0 min
1. Positional tolerance 0.4 mm diameter. M 30.0 max
2. Anode temperature measured at this point. N 19.0
3. The mating surface of the magnetron baseplate will be P 16.0
flat to within 0.2 mm. Q 8.0 min
4. Silicone rubber insulated leads, 3.2 mm diameter, R 15.5 max
contained within dimension P. S 19.0 ± 1.0
4.1 max
T
3.9 min

© e2v technologies (uk) limited 2016 Document subject to disclaimer on page 1 A1A-MG4004 Version 12, page 5