HF, VHF, and UHF Systems and Technology.
A wide variety of unique systems and components inhabits the HF, VHF, and UHF bands. Many communication systems (ionospheric, meteor-burst, and troposcatter) provide beyond- line-of-sight coverage and operate independently of external infrastructure. Broadcasting and over-the-horizon radar also operate in these bands. Magnetic-resonance imaging uses HF/VHF signals to see the interior of a human body, and RF heating is used in a variety of medical and industrial applications. Receivers typically employ a mix of analog and digital-signal-processing techniques. Systems for these frequencies make use of RF-power MOSFETs, p-i-n diodes, and ferrite-loaded transmission-line transformers.
|Main Author:||Raab, Frederick H.|
|Other Authors:||Caverly, Robert H., Campbell, Richard., Eron, Murat., Hecht, James B., Mediano, Arturo., Myer, Daniel P., Walker, John L. B.|