Where precise frequencies are needed, other devices such as the klystron are used.
From the en.wikipedia.org
High-powered klystron amplifier tubes can provide hundreds of kilowatts in the UHF range.
From the en.wikipedia.org
Klystron 9 has the ability to see storms other radards can't see and see deeper into those storms.
From the en.wikipedia.org
In this case the radar transmitter must be a power-amplifier, e.g. a klystron tube or a solid state transmitter.
From the en.wikipedia.org
The klystron, a powerful but narrow-band radio-frequency amplifier, is commonly deployed by broadcasters as a high-power UHF television transmitter.
From the en.wikipedia.org
The TDX was improved to the TD2, which still used klystron tubes in the transmitters, and then later to the TD3 that used solid state electronics.
From the en.wikipedia.org
However, the German military considered the frequency drift of Hollman's device to be undesirable, and based their radar systems on the klystron instead.
From the en.wikipedia.org
Most peninsula technology pioneers had Stanford connections, from 1911 grad student Cyril Elwell to the Varian brothers and their revolutionary 1939 klystron tube, developed on the campus.
From the sfgate.com
However some vacuum tube electronic devices are still in common use including the magnetron, klystron, photomultiplier, x-ray tube, traveling-wave tube and cathode ray tube.
From the en.wikipedia.org
More examples
An electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation
A klystron is a specialized linear-beam vacuum tube (evacuated electron tube). Klystrons are used as amplifiers at microwave and radio frequencies to produce both low-power reference signals for superheterodyne radar receivers and to produce high-power carrier waves for communications and the ...
Type of high-power amplifier that uses a special beam tube.
An electron tube used as a low-power oscillator or a high-power amplifier at ultrahigh frequencies. Noted for exceptional stability over long periods of transmission.