e2v MG5239T Quick Start Manual

MG5239T

123197

X-Band Magnetron

The data should be read in conjunction with the Magnetron
Preamble.

ABRIDGED DATA

Fixed frequency pulse magnetron.

Operating frequency ...... 9375 + 25 MHz

Minimum peak output power ...... 25 kW

Magnet ...............integral

Output ............ no.16waveguide

(22.86 x 10.16 mm internal)

Coupler ..............UG-40B/U

(NATO S.N. 5985-99-083-0051)

Cooling ...........natural or forced-air

GENERAL

Electrical

Cathode ............indirectly heated

Heater voltage (see note 1) ........6.3 V

Heater current at 6.3 V .........0.55 A

Heater starting current, peak value,

not to be exceeded ..........3.0Amax

Cathode pre-heating time (minimum)

(see note 2) ........... 60 s

Mechanical

Overall dimensions ...........seeoutline

Net weight ............1.5kgapprox

Mounting position ............. any

A minimum clearance of 50 mm must be maintained between
the magnet and any magnetic materials.

Cooling ...........natural or forced-air

e2v technologies (uk) limited, Waterhouse Lane, Chelmsford, Essex CM1 2QU, UK Telephone: [phone] Facsimile: [phone]
e-mail: [e-mail] Internet: www.e2v.com Holding Company: e2v technologies plc

MAXIMUM AND MINIMUM RATINGS

(Absolute values)

These ratings cannot necessarily be used simultaneously, and
no individual rating should be exceeded.

Heater voltage (see note 1) ..... 5.7 6.9 V

Heater starting current (peak) .... – 3.0 A

Anode voltage (peak) ....... 7.5 8.2 kV

Anode current (peak) ....... 6.0 10 A

Input power (peak) ........ – 75 kW

Input power (mean) (see note 3) . . . – 85 W

Duty cycle .......... – 0.0015

Pulse duration ......... – 2.0 ms

Rate of rise of voltage pulse

(see notes 4 and 5) ....... – 200kV/ms

Anode temperature (see note 6) . . . – 120 8C

VSWR at the output coupler .... – 1.5:1

TYPICAL OPERATION

Operating Conditions

Heater voltage ......... 6.3 6.3 V

Anode current (peak) ....... 8.0 8.0 A

Pulse duration ......... 1.0 0.1 ms

Pulse repetition rate ...... 500 1000 pps

Rate of rise of voltage pulse .... 120 120kV/ms

Typical Performance

Anode voltage (peak) ....... 8.0 8.0 kV

Output power (peak) ...... 27 27 kW

Output power (mean) ...... 13.5 2.7 W

Min Max

Oscillation

12

# e2v

technologies limited (uk) 2016

A1A-MG5239T Issue 7, June 2016

TEST CONDITIONS AND LIMITS

The magnetron is tested to comply with the following electrical specification.

Test Conditions

Oscillation Oscillation

12

Heater voltage (for test) ................. 6.3 6.3 V

Anode current (mean) ................. 4.0 0.8 mA

Duty cycle ..................... 0.0005 0.0001

Pulse duration (see note 7) ................ 0.5 0.05 ms

VSWR at the output coupler ............... 1.15:1 1.15:1 max

Rate of rise of voltage pulse (see note 4):

using hard tube pulser ............... 200 200 kV/ms min

alternatively using line type pulser ............ 120 120 kV/ms min

Limits

Min Max Min Max

Anode voltage (peak) ................ 7.5 8.2 7.5 8.2 kV

Output power (mean) ............... 12.5 – 2.5 – W

Frequency (see note 8) .............. 9350 9400 – – MHz

RF bandwidth at

Frequency pulling (VSWR not less than 1.5:1) ....... – 23 – – MHz

Stability (see note 9) ................ – 0.1 – 0.1 %

Heater current ...................................seenote 10

Temperature coefficient of frequency ...........................seenote 11

1

/4power .............. – 5.0 – 50 MHz

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)

Anode voltage (peak) ......7.5to8.5 kV

Output power (peak) ....... 16 kWmin

RF bandwidth at

Frequency ....... 9350 to 9400 MHz

Stability (see note 9) ........ 1.0 %max

1

/4power ...... 5.0 MHzmax

NOTES

1. With no anode input power.

For average values of pulse input power greater than
40 W the heater voltage must be reduced within 3 seconds
after the application of HT according to the following
schedule:

V

= 0.08 (110 7 Pi) volts

h

where Pi = average input power in watts.

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. For ambient temperatures above 0 8C. For ambient
temperatures between 0 and 755 8C the cathode pre­heating time is 90 seconds.

3. The various parameters are related by the following
formula:

Pi = i

apkxvapk

xDu

where Pi = mean input power in watts

i

= peak anode current in amperes

apk

v

= peak anode voltage in volts

apk

and Du = duty cycle.

4. 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.

5.

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 70 to 120 kV/ms.

6.

The anode temperature measured at the point indicated on
the outline drawing must be kept below the limit specified by
means of a suitable flow of air over the anode body and
waveguide attachment brackets which serve as cooling fins.

7. Tolerance + 40%.

8. Other frequency ranges can be supplied on request.

9. With the magnetron operating into a VSWR of 1.15:1.
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
the period of observation after a period of 10 minutes
operation.

10. Measured with heater voltage of 6.3 V and no anode input
power, the heater current limits are 0.43 A minimum,

0.60 A maximum.

11. Design test only. The maximum frequency change
with anode temperature change (after warming) is

70.25 MHz/8C.

MG5239T, page 2 # e2v technologies

TYPICAL PERFORMANCE CHART

10

PEAK ANODE VOLTAGE (kV)PEAK OUTPUT POWER (kW)

35

30

25

7897

MAXIMUM

8

MINIMUM

6

4

2

0

PEAK CURRENT
RATING LIMITS

TYPICAL

TYPICAL

MINIMUM

20

15

10

5

0

024681012

PEAK ANODE CURRENT (A)

# e2v technologies MG5239T, page 3

OUTLINE

(All dimensions without limits are nominal)

TO FIT 4BA

TERMINALS

LEADS Z LONG

SEE NOTE 11

7936

SEE NOTE 1

SEE NOTE 2

R

REFERENCE PLANE C

SEE NOTE 5

SEE NOTE 10

N

ML

K

Y

J

REFERENCE

PLANE A

2 HOLES 1D
SEE NOTE 6

T

S

AA

W

SURFACE A
SEE NOTES 2, 3 AND 4

Lead Connections

Colour Element

Green Heater
Yellow Heater, cathode

SEE NOTE 7

Ref Millimetres

A 113.11 + 0.38

1H

B 104.22 + 0.10
C 4.318 + 0.076
D 4.445 + 0.076
E 4.368 + 0.41
F 32.5 + 0.1

P

BA

G 31.0 + 0.1
H 25.4 max
J 5.18 + 0.38
K 41.28 + 0.41

SEE NOTE 8

Q

F

L 52.4 max
M 55.55 max
N 30.15 max

4 HOLES 1C

G

E

REFERENCE PLANE B
SEE NOTE 9

P 101.6 max
Q 46.0 min
R 84.12 max
S 63.5
T 12.7 max
W 3.175
Y 30.99 + 0.10
Z 311.2 + 12.7
AA 33.0

MG5239T, page 4 # e2v technologies

Outline Notes

1. Recommended direction of air flow if required.

2. Anode temperature measured at this point.

3. With surface A resting on a flat surface plate, a feeler
gauge 0.51 mm thick and 3.18 mm wide will not enter more
than 3.18 mm at any point.

4. Surface A and interior surfaces of the waveguide will be
plated with 1.55 mg/cm
but will not be plated if the parts are made of monel or
equivalent corrosion resistant materials. All other metal
surfaces will be painted with heat resistant paint or
otherwise treated to prevent corrosion.

5. Reference plane C intersects plane B at the centre of the
mounting plate hole as shown and is mutually perpendi­cular to reference planes A and B.

6. These holes will lie within 0.127 mm of the indicated
centres. A cylinder of 8.38 mm diameter and centred on
these holes will clear the side of the magnet.

7. The position of the waveguide hole is not specified on this
drawing since tubes are tested and used with coupler
UG-40B/U (NATO S.N. 5985-99-083-0051).

8. The centre of this hole will lie within 0.102 mm of reference
plane C.

9. Reference plane B passes through the centres of the two
holes of the mounting plate as shown and is perpendicular
to reference plane A.

10. The north seeking pole of the magnet will be adjacent to
the cathode sidearm.

11. Length of flying leads measured from the centre line of the
anode block.

2

of gold or 4.65 mg/cm2of silver,

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.

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.

Printed in England# e2v technologies MG5239T, page 5