QF42A

Medium-Q X-band integral-cavity TR gas-discharge cell for circular waveguide, using a preset tuner for radar receiver protection.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: -

Description

Ferranti QF42A is a medium-Q X-band integral-cavity T.R. gas-discharge cell intended for circular waveguide. It incorporates preset tuning and a primer electrode, with 50 kW peak transmitter rating and defined high-power leakage behavior.

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

MicrowaveTRSwitch

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Microwave T.R. gas-discharge cell; device-specific primer, breakdown, leakage, recovery, frequency and power data are retained in parameter rows.

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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

MicrowaveTRSwitch

Other

Maximum transmitter power
50 kW
Peak
Primer supply voltage
-1500 to -700 V
Negative D.C. supply limits
Primer current
100 to 200 uA
Primer electrode

Characteristic

Preset tuning span
75 Mc/s
Approximately ±75 Mc/s
Loaded Q
- to 160
Low power, approximate limit
VSWR at resonance
- to 1.4
Low power; average and limit
Insertion loss
- to 1.2 dB
Low power; average and limit
Flat leakage power
- to 30 mW
40 kW high-power test
Spike leakage energy
- to 0.1 erg/pulse
40 kW high-power test
Breakdown power
- to 250 mW
High power
Recovery time to -6 dB
- to 4 us
High power
Primer operating voltage
250 to 450 V
Approximate operating range from table

Frequency

Operating frequency
9005 to 9155 Mc/s
QF42A suffix range as listed on sheet