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Specialized - Magnetron ·Magnetron

M505

Fixed-frequency pulse magnetron intended for short-duration high-peak-power microwave generation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
3.5 V / 3.5 A

Description

Fixed frequency pulse magnetron

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
3.5 V
Nominal heater current
3.5 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Magnetron

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Promoted values mapped from printed rating/approximate-data tables; additional operating points and capacitances retained as parameters.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Magnetron

Other

  • Starting Heater Voltage Minimum

    3.3 V

  • Starting Heater Voltage Maximum

    3.7 V

  • Heater Voltage at Maximum Input

    2 V

  • Heater Current at 3V

    3.5 A

  • Frequency Minimum

    9360 MHz

  • Frequency Maximum

    9460 MHz

  • Tuning Pulling Range

    14 MHz

  • Rate of Rise of Voltage Maximum

    100 kV/us

  • Duty Cycle Maximum

    0.001

  • Magnetic Field Minimum

    3200 Oe

  • Magnetic Field Maximum

    3300 Oe

  • Input Power Maximum

    150 W

  • Peak Anode Current Maximum

    12 A

  • Pulse Duration Maximum

    1 us

  • Anode Temperature Maximum

    140 C

  • Typical Peak Anode Voltage

    12 kV

  • Typical Peak Anode Current

    12 A

  • Typical Magnetic Field

    3250 Oe

  • Typical PRF

    1000 pps

  • Typical Peak Output Power

    60 kW

Data set 02

1971 English Electric Valve

Published operating points and test conditions from this source.

SECTION 1

Magnetron

Other

  • Frequency range

    9460 MHz

    Frequency range 9360 to 9460 MHz

  • Typical peak output power

    45 kW

    Typical peak output power 45 kW

  • Heater current at 3.0V

    3.5 A

    Heater current at 3.0V . 3.5 A

  • Cathode heating time (minimum)

    20 s

    Cathode heating time (minimum) 20 s

  • Anode voltage (peak)

    16 kV

    Anode voltage (peak) 10 16 kV

  • Anode current {peak)

    12 A

    Anode current {peak) — 12 A

  • Pulse length

    2

    Pulse length . . . . . . . . . - 2.0 MS

  • V.S.W.R. at the output coupler

    1 V

    V.S.W.R. at the output coupler . — 1.6:1

  • Heater voitage

    1.5 A

    Heater voitage . 1.5 A

  • Anode current (peak)

    12

    Anode current (peak) 12 Al

  • Pulse length

    1

    Pulse length 1.0 us

  • Pulse repetition rate

    1000 s

    Pulse repetition rate 1000 p.p.s.

  • Anode voltage {peak)

    1.1 kV

    Anode voltage {peak) 1.1 kV

  • Output power (peak)

    45 kW

    Output power (peak) 45 kW

  • Output power {mean)

    45 W

    Output power {mean) 45 W

  • Heater voltage (fortest)

    1.5

    Heater voltage (fortest) . 1.5 1.5 1.5 \%

  • Anode current {mean)

    12 mA

    Anode current {mean) . . 12 12 12 mA

  • Anode voltage (peak)

    12.5 kV

    Anode voltage (peak) .10.5 12.5 - - - - kV

  • Output power {mean) . 35

    35 W

    Output power {mean) . 35 — - - - - W

  • Frequency pulling

    15 MHz

    Frequency pulling . . — — — 15 — — MHz

  • Output power (mean)

    28 W

    Output power (mean) . . .. . . . . 28 W min

  • R.F. bandwidth at % power (Oscnlauon2)

    3 MHz

    R.F. bandwidth at % power (Oscnlauon2) .. 3.0 MHz max

  • Frequency

    9460 MHz

    Frequency . 9360 to 9460 MHz

  • 1. With no anode input power.

    1

    1. With no anode input power.

  • mum capacitance of 4000pF shunted across the heater directly at the

    4000

    mum capacitance of 4000pF shunted across the heater directly at the

  • input terminals; in some cases a capacitance as high as 2uF may be nec-

    2 a

    input terminals; in some cases a capacitance as high as 2uF may be nec-

  • teading edge of the voltage pulse above 80% amplitude. Any capaci-

    80

    teading edge of the voltage pulse above 80% amplitude. Any capaci-

  • At anode temperature 25°C

    25 °C

    At anode temperature 25°C.

  • The maximum bandwidth in MHz is given by 3.0/(pulse length in us)

    3 MHz

    The maximum bandwidth in MHz is given by 3.0/(pulse length in us).

  • The mean anode current is varied between 12 and 14mA

    14

    The mean anode current is varied between 12 and 14mA.

  • of the number of input pulses applied during this 30 second period

    30

    of the number of input pulses applied during this 30 second period.

  • Pulses are definea as missing when the r.f. energy level is less than 70%

    70

    Pulses are definea as missing when the r.f. energy level is less than 70%

  • of the normal energy level in the frequency range 9360 to 9460MHz

    9460

    of the normal energy level in the frequency range 9360 to 9460MHz.

  • 11

    11 a

    11. When a signal of the same frequency as the valve operating frequency is

  • The v.s.w.r. is tested to be greater than 6:1 and its phase such that a

    1 v

    The v.s.w.r. is tested to be greater than 6:1 and its phase such that a

  • 12

    15

    12. Over the range 8 to 15mA, no pulses shall be missing when viewed with

  • 13

    3

    13. Measured with heater voltage of 3.0V and no anode input power, the

  • heater current limits are 3.0A minimum, 4.0A maximum

    4

    heater current limits are 3.0A minimum, 4.0A maximum.

  • 14

    14

    14. Design test only. The maximum frequency change with anode tempera-

  • 2. The common cathode connection is indicated by a letter ‘C' on this

    2 a

    2. The common cathode connection is indicated by a letter ‘C' on this