The primary mode of propagation for VHF radio waves is through direct waves . These travel in a straight line, becoming weaker as distance increases. Transmitting and receiving antennas must be able to ‘see’ each other for communications to be effective, so antenna height is critical in determining range.
Read moreWhat causes VHF propagation?
This is the result of the movement of cool, humid air shortly after sunset when the ground air cools more quickly than the upper air layers . The same action may take place in the morning when the rising sun warms the upper layers.
Read moreWhy is UHF used for aircraft?
Ultra High Frequency (UHF) radio stations are currently used for Air Traffic Control air-ground voice communications for military aircraft flying as operational air traffic (OAT) and for the handling of non-8.33 kHz State aircraft which may operate as General Air Traffic/Instrument Flight Rules (GAT/IFR) in 8.33 kHz …2 Haz 2010
Read moreIs there a difference between UHF and VHF?
VHF radios are suited for long distances in and outdoor use. UHF radios operate at a higher frequency. This makes them ideal for wireless communications that need to penetrate through buildings, walls, or concrete. UHF radios are suited for indoor communication solutions, where obstacles are easily penetrable.
Read moreWhat is the best frequency to listen to aircraft?
To listen to your local air traffic control, you’ll need to obtain a radio scanner that’s capable of receiving frequencies between 118.0 and 136.975 MHz . Then, go on sites like skyvector.com to find an aeronautical sectional chart of your local area.
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