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Specialized - Traveling Wave ·TravelingWave

LD550B

Traveling-wave power amplifier for roughly 7.2–8.5 GHz service, providing about 10 watts typical saturated output and high small-signal gain.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
-

Description

The LD550B is a continuous-wave traveling-wave amplifier covering approximately 7.2 to 8.5 GHz, using depressed-collector operation for improved efficiency in microwave systems.

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
-
Nominal heater current
-
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

TravelingWave

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published maximum ratings and characteristics audited; remaining numeric data retained densely in parameter table.

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

1971 NEC

Published operating points and test conditions from this source.

SECTION 1

TravelingWave

Other

  • frequency range [1]

    7.2

    frequency range 7.2 kMc to 8.5 kMc. The nominal gain is 40db at 1

  • frequency range [2]

    8.5

    frequency range 7.2 kMc to 8.5 kMc. The nominal gain is 40db at 1

  • frequency range [3]

    40

    frequency range 7.2 kMc to 8.5 kMc. The nominal gain is 40db at 1

  • frequency range [4]

    1

    frequency range 7.2 kMc to 8.5 kMc. The nominal gain is 40db at 1

  • watt output level with a typical saturation output power of

    10 W

    watt output level with a typical saturation output power of 10 watts,

  • permanent magnet focusing mount, type LD

    550

    permanent magnet focusing mount, type LD-550B Mount, incorporated with

  • Published value

    1

    1. PPM Focused and Field Replaceable.

  • Published value

    2

    2. Depressed Collector Operation for Improved Efficiency.

  • Collector Voltage (Eb) [1]

    1600 V

    Collector Voltage (Eb) 1600 Vde 3000 Vdc

  • Collector Voltage (Eb) [2]

    3000 V

    Collector Voltage (Eb) 1600 Vde 3000 Vdc

  • Collector Current (Ib) . ooooo e

    34 A

    Collector Current (Ib) . ooooo e 34 mA dc

  • Helix Voltage (Bw) [1]

    2700 V

    Helix Voltage (Bw) . 2700 Vdc 34,00 Vdc

  • Helix Voltage (Bw) [2]

    3400 V

    Helix Voltage (Bw) . 2700 Vdc 34,00 Vdc

  • Accelerating Anode Voltage

    3400 V

    Accelerating Anode Voltage 3400 Vdc

  • Accelerating Anode Current

    1 A

    Accelerating Anode Current 1.0 mA dc

  • Focusing flectrode Voltage ~

    -20 V

    Focusing flectrode Voltage ~-20 Vdc

  • Collector Dissipation

    56 W

    Collector Dissipation 56 W

  • Collector Seal Temperature

    130

    Collector Seal Temperature 130 °C -

  • Mount Ambient Temperature Range [1]

    -10

    Mount Ambient Temperature Range -10 °cC +55 °C

  • Mount Ambient Temperature Range [2]

    55

    Mount Ambient Temperature Range -10 °cC +55 °C

  • Cathode Heating Time

    90

    Cathode Heating Time 90 sec,

  • Cold input and output match over [1]

    7.2

    Cold input and output match over 7.2 to 7.65, 7.65 to &.1 and 8.1 to

  • Cold input and output match over [2]

    7.65

    Cold input and output match over 7.2 to 7.65, 7.65 to &.1 and 8.1 to

  • Cold input and output match over [3]

    7.65

    Cold input and output match over 7.2 to 7.65, 7.65 to &.1 and 8.1 to

  • Cold input and output match over [4]

    1

    Cold input and output match over 7.2 to 7.65, 7.65 to &.1 and 8.1 to

  • Cold input and output match over [5]

    8.1

    Cold input and output match over 7.2 to 7.65, 7.65 to &.1 and 8.1 to

  • Heater Current at [1]

    6.3 A

    Heater Current at 6.3 Volts .. ..... . cereses 0.6 A

  • Heater Current at [2]

    600 mA

    Heater Current at 6.3 Volts .. ..... . cereses 0.6 A

  • Frequency [1]

    7.8

    Frequency 7.8 kMc 8.5 kMc

  • Frequency [2]

    8.5

    Frequency 7.8 kMc 8.5 kMc

  • RF Output Power [1]

    8.5 W

    RF Output Power : 8.5W 7.5 W L.5W

  • RF Output Power [2]

    7.5 W

    RF Output Power : 8.5W 7.5 W L.5W

  • RF Output Power [3]

    5 W

    RF Output Power : 8.5W 7.5 W L.5W

  • (

    0.5

    (0.5 mW input level)

  • RF Saturated Output Power [1]

    14 W

    RF Saturated Output Power 14,.0 W 12,0 W 10.0 W

  • RF Saturated Output Power [2]

    120 W

    RF Saturated Output Power 14,.0 W 12,0 W 10.0 W

  • RF Saturated Output Power [3]

    10 W

    RF Saturated Output Power 14,.0 W 12,0 W 10.0 W

  • Small Signal Gain Li, db

    43

    Small Signal Gain Li, db 43 db L0 db

  • (

    0.1

    (0.1 mW input level)

  • helix current due to other magnetic materials less than

    100 mA

    helix current due to other magnetic materials less than 0.1 mA.

  • Published value

    5 V

    5. Applications of Voltage

  • Published value

    5.1 V

    5.1 Apply the heater voltage and allow a minimum warm-up period

  • Published value

    5.2 V

    5.2 Set the focusing electrode, collector and helix voltages

  • Published value

    5.3 V

    5.3 Switch on all voltages. Accelerating anode voltage should be

  • Published value

    5.4 A

    5.4, Adjust tube position carefully to optimize current transmission

  • Published value

    5.5

    5.5 Apply the specified rf drive and adjust accelerating anode

  • Published value

    5.6 V

    5.6 Adjust the helix voltage for optimum operation. The helix

  • voltage should never be made to exceed

    3400 V

    voltage should never be made to exceed 3400 voltis or fall

  • below

    2700 V

    below 2700 volts. If the helix voltage is above or below

  • The collector voltage should never be depressed below

    1600 V

    The collector voltage should never be depressed below 1600 volts

  • Published value

    5.7 V

    5.7 Readjust tube position and adjust the focusing electrode voltage