M577B

Other

• Fixed frequency pulse magnetrons, replacing types Mb77, Mb77A and M578,

  578

  Fixed frequency pulse magnetrons, replacing types Mb77, Mb77A and M578,

• M578A. Frequency variants of 4J43 and 4J44

  44

  M578A. Frequency variants of 4J43 and 4J44.

• Typical peak output power

  900 kW

  Typical peak output power 900 kW

• Heater current

  3.1 A

  Heater current 3.1 A

• Heater starting current (peak)

  15 A

  Heater starting current (peak) 15 A

• Anode voltage (peak)

  30 kV

  Anode voltage (peak) 30 kV

• Anode current (peak)

  70 A

  Anode current (peak) 70 A

• Cathode terminal temperature

  100

  Cathode terminal temperature 100 °c

• V.S.W.R. at the output coupler

  1 V

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

• Heater voltage

  10.5

  Heater voltage 10.5 vV

• Anode current (peak)

  70 A

  Anode current (peak) 70 A

• Pulse length

  1

  Pulse length 1.0 us

• Anode voltage {peak)

  28 kV

  Anode voltage {peak) 28 kV

• Output power (peak)

  900 kW

  Output power (peak) 900 kW

• Output power (mean)

  450 W

  Output power (mean) 450 W

• Heater voltage (for test)

  10

  Heater voltage (for test) 10 10 \Y

• Anode current {mean)

  45 mA

  Anode current {mean) 35 45 mA

• V.S.W.R. at the output coupler

  1 V

  V.S.W.R. at the output coupler 1.156:1 1.156:1

• Anode voltage (peak)

  30 kV

  Anode voltage (peak) 26 30 — - kV

• R.F. bandwidth at % power

  25 MHz

  R.F. bandwidth at % power — 25 - — MHz

• Output power {mean}

  320 W

  Output power {mean} 320 W min

• R.F. bandwidth at % power

  2.5 MHz

  R.F. bandwidth at % power 2.5 MHz max

• 1. (a) With no anode input power.

  1 a

  1. (a) With no anode input power.

• minimum capacitance of 4000pF shunted across the heater

  4000

  minimum capacitance of 4000pF shunted across the heater

• {b)

  578

  {b) MB77B and M578B have hum-free heaters and have been tested

• of frequency 50, 60 and 500Hz. English Electric Valve Company

  500

  of frequency 50, 60 and 500Hz. English Electric Valve Company

• between 0 and —B5°C the cathode heating time is 3 minutes minimum

  3 °C

  between 0 and —B5°C the cathode heating time is 3 minutes minimum.

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

  80

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

• age of the number of input pulses applied during the last 30 seconds of

  30

  age of the number of input pulses applied during the last 30 seconds of

• Measured with heater voltage of 16V and no anode input power, the

  16

  Measured with heater voltage of 16V and no anode input power, the

• heater current limits are 2.8A minimum, 3.4A maximum

  3.4

  heater current limits are 2.8A minimum, 3.4A maximum.

• 11

  11

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

• 1| OUTPUT POWER

  1

  1| OUTPUT POWER

• The periphery of the anode will lie within a 2.160 inch (54.86mm)

  54.86 a

  The periphery of the anode will lie within a 2.160 inch (54.86mm)

• 13

  13

  13. The common cathode connection is indicated by letter C.