The Retevis RA89 has 10 watt Ultra High Power. large FR power for better penetration of radio waves. RA89 has good communications even under collapsed buildings.
Radio interference from buildings
Everyone knows that dense buildings have a significant impact on radio propagation. There is another situation that may have a more deadly effect on RADIO. It is the collapsed building. Radio can propagate through the air, not really within the walls. With a collapsed building, space is drastically reduced. This almost completely blocks the propagation of radio. It’s radio that relies on reflection, refraction, diffraction, traveling through tiny gaps. Knowing that the energy is depleted.
If we increase the transmitter power, the radio waves will be able to travel farther through the collapsed rubble. the RA89’s fr power is 10 watt, and with a longer antenna, he’ll be able to transmit energy in a given direction. If we go with a longer antenna, we’ll have much more power to propagate in a given direction. It could be useful in a crisis.
How Rainstorms Affect Radios？
Let’s talk more about the effect on radio of a weather storm that is common in disasters. A light rain may have a negligible effect on radio. But the effect of a rainstorm on radio is close to the same as in a dense urban building.
Direct interference is caused by weather conditions that directly alter the radio waves path; it’s either reflected, refracted, or blocked. For example, heavy rain causes the waves to bounce around as the signal attempts to travel through the water droplets.
Raindrops are made of water, which has a significantly larger dielectric constant than air. The presence of heavy rain makes the space between the transmitter and receiver appear like an inhomogeneous medium. This leads to scattering (just like the much smaller droplets of fog scatter visible light). As a result the there is an additional power loss between transmitter and receiver.
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