enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Moxon antenna - Wikipedia

   en.wikipedia.org/wiki/Moxon_antenna

   Moxon antenna for the 20-meter band.The antenna is the faint rectangle of wires held in tension by the bent X-shaped support frame. Moxon antenna for the 2-meter band. The Moxon antenna or Moxon rectangle is a simple and mechanically rugged two-element parasitic array, single-frequency antenna. [1]

3. Klystron - Wikipedia

   en.wikipedia.org/wiki/Klystron

   The Varians went on to found Varian Associates to commercialize the technology (for example, to make small linear accelerators to generate photons for external beam radiation therapy). Their work was preceded by the description of velocity modulation by A. Arsenjewa-Heil and Oskar Heil (wife and husband) in 1935, though the Varians were ...

4. AN/URM-25 signal generator - Wikipedia

   en.wikipedia.org/wiki/AN/URM-25_signal_generator

   The AN/URM-25 was part of a series of vacuum tube-based signal generators built for the U.S. military in the early Cold War-era.. Today they are collected and used by vintage amateur radio and antique radio enthusiasts who say they provide reasonably high accuracy and stability for a low cost, with build quality reflecting tough military construction requirements and standards.

5. High-frequency Active Auroral Research Program - Wikipedia

   en.wikipedia.org/wiki/High-frequency_Active...

   The HAARP project directs a 3.6 M W signal, in the 2.8–10 MHz region of the HF band, into the ionosphere. The signal may be pulsed or continuous. Effects of the transmission and any recovery period can be examined using associated instrumentation, including VHF and UHF radars, HF receivers, and optical cameras. According to the HAARP team ...

6. Super high frequency - Wikipedia

   en.wikipedia.org/wiki/Super_high_frequency

   The rotating bar sweeps a vertical fan-shaped beam of microwaves around the water surface to the horizon, detecting nearby ships and other obstructions Microwaves propagate solely by line of sight ; because of the small refraction due to their short wavelength, the groundwave and ionospheric reflection ( skywave or "skip" propagation) seen with ...

7. Beamforming - Wikipedia

   en.wikipedia.org/wiki/Beamforming

   Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception. [1] This is achieved by combining elements in an antenna array in such a way that signals at particular angles experience constructive interference while others experience destructive interference.