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9.375 GHz 20 kW (peak) magnetron assembly for an early commercial airport radar in 1947. In addition to the magnetron (right), it contains a TR (transmit/receive) switch tube and the superheterodyne receiver front end, a 2K25 reflex klystron tube local oscillator and a 1N21 germanium diode mixer. The waveguide aperture (left) would be connected ...
Microwave tubes: Frequency in GHz; Rectifying tubes: DC output voltage in kV; Thyratrons: Peak inverse voltage in kV; Transmitting tubes: Maximum anode voltage in kV; The following group of digits indicate the power: Backward-wave amplifier or Traveling-wave tube: Output power; 2nd letter: A – in mW; 2nd letter: B – in W; Klystrons: Output ...
The simplest klystron tube is the two-cavity klystron. In this tube there are two microwave cavity resonators, the "catcher" and the "buncher". When used as an amplifier, the weak microwave signal to be amplified is applied to the buncher cavity through a coaxial cable or waveguide, and the amplified signal is extracted from the catcher cavity.
The klystron tube transmitter operates in the S-band between 2.5 and 2.9 GHz in circular polarization with a peak power of 1.3 MW and a pulse duration of 1 μs and pulse repetition frequency between 325 and 1200 pps. It can be switched to a second reserve frequency if interference is encountered on the primary frequency.
In early 1941, JRC was given a contract by NTRI to design and build a microwave surface-detection system for warships. Designated Type 22, this used a pulse-modulated, 10 cm (3.0 GHz) magnetron with water-cooling and producing 2 kW peak-power. The receiver was a super-heterodyne type with a low-power magnetron serving as the local oscillator.
Many electron paramagnetic resonance (EPR) spectrometers operate near 9.8 GHz. Particle accelerators may be powered by X-band RF sources. The frequencies are then standardized at 11.9942 GHz (Europe) or 11.424 GHz (US), [ 10 ] [ 11 ] which is the second harmonic of C-band and fourth harmonic of S-band .