Radar
An ancillary device is one that is not the primary one. For example in your motor car, the propulsion system is the primary device, otherwise there would be no purpose in having it. But the lamps are ancillary devices, but pretty important nonetheless. But your radio or cigar lighter are much less important, and are ancillary devices. Similarly with your cooking stove, the clock is likely an ancillary device and you use it rarely, if at all. This clock is an ancillary device.
Narrow-Band (also referred to as short-wave) is a term used to describe the amplitude of a radio device. Narrow-band devices are limited to an average of 400m.
All wireless / radio signals have the capability of passing through solid objects. The problem can best be described as a ratio of the density of the object to the frequency of the signal. A high frequency signal is more likely to bounce off a concrete wall, than, say, a shoji screen. To pass through the most dense objects, you need a signal of the longest wavelength.
It is an amateur radio {ham radio} callsign issued by the FCC.
QUite a bit of newer computer hardware is equipped with Infra-red beaming technology. It allows you to send data between computer devices without wires or radio frequency connections. The data is sent in much the same way your television remote works.
radar
R a d a r
Radar
One method for detecting and locating objects is through the use of RFID (Radio-Frequency Identification) technology. RFID tags are attached to objects and emit radio waves that can be picked up by RFID readers, allowing for the detection and location of the objects in real-time.
Radio Telescope
RADAR
R a d a r
A radio telescope is used to detect radio waves emitted from objects in space. These telescopes collect and amplify these signals to create images and study various celestial phenomena such as supernovae, pulsars, and other cosmic events. The information gathered helps astronomers to better understand the universe.
in a car or radio or radio playing device :)
Objects such as pulsars, radio galaxies, supernova remnants, and active galactic nuclei are known to emit radio waves in space. These emissions can be detected by radio telescopes and provide valuable information about the nature and behavior of these cosmic objects.
There are various objects that can be responsible for radio emissions in space. These objects are referred to as astronomical radio sources.
Pulsar, since you would need some mechanical device to produce radio waves.