QF40

Integral-cavity high-Q 3-cm-band TR cell for radar duplexer and crystal-protection service. Gas discharge protects sensitive receiver components during transmitter pulses.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Integral-cavity high-Q 3-cm-band T.R. cell for radar duplexer and crystal protection service.

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.

Published Ferranti ratings and characteristics promoted where applicable; additional electrical, pulse, regulator, microwave, and operating data 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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

MicrowaveTRSwitch

Application

Application
3-cm-band radar T.R. duplexer protection cell

Other

Transmitter peak power maximum
50 kW
Pulse
VSWR maximum
2
Insertion loss maximum
1.5 dB
Leakage spike energy maximum
0.04 erg/pulse
Pulse
Leakage flat power maximum
15 mW
Pulse
Breakdown power minimum
100 mW
Recovery time to 6 dB loss maximum
15 us
Keep-alive breakdown voltage maximum
1000 V
Typical VSWR
1.4
Typical insertion loss
1.2 dB
Typical leakage spike energy
0.02 erg/pulse
Pulse
Typical leakage flat power
10 mW
Pulse
Typical breakdown power
40 mW
Typical recovery time to 6 dB loss
2.5 us
Typical keep-alive breakdown voltage
700 V
Typical keep-alive potential drop
350 V
Keep-alive supply voltage
-1000 V
Keep-alive current minimum
100 uA
Keep-alive current maximum
150 uA
Keep-alive series resistance minimum
1 Mohm

Characteristics

Nominal tuning frequency
9500 MHz
Tuning range tolerance
5 %