WF44

Broadband X-band TR gas-discharge cell with separate DC and pre-pulse keep-alive electrodes, designed for branched or balanced radar duplexer systems.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Ferranti WF44 is a broadband X-band T.R. gas-discharge cell with separate D.C. and pre-pulse keep-alive electrodes. It supports branched or balanced duplexer systems and is rated to 200 kW peak transmitter line power.

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

Frequency

Frequency range
8500 to 10000 Mc/s

Other

Maximum transmitter line power
200 kW
Peak
Minimum transmitter line power
4 kW
D.C. primer supply voltage
-1500 to -950 V
Negative D.C.
D.C. primer current
100 to 185 uA
Maximum pre-pulse primer voltage
-650 V
Peak, ±10%
Maximum pre-pulse primer current
10 mA
Pre-pulse duration
2 us
Peak amplitude 650 V ±10%, precedes RF pulse by 0.2 us
Storage ambient temperature
-40 to 100 C

Characteristic

Maximum VSWR, low band
1.4
8500-8850 Mc/s
Maximum VSWR, mid band
1.25
8850-9850 Mc/s
Maximum VSWR, high band
1.3
9850-10000 Mc/s
Maximum insertion loss
1 dB
Primer energized
Maximum total leakage power
100 mW
200 kW peak, unpulsed
Maximum spike leakage energy, unpulsed
0.3 erg/pulse
200 kW peak
Maximum spike leakage energy, pre-pulsed
0.1 erg/pulse
200 kW peak
Maximum primer breakdown power
250 mW
Maximum recovery time to -6 dB
3 us
Maximum arc loss at 4 kW
0.8 dB
D.C. primer operating voltage
180 to 280 V