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
Radio Telescope
A radio telescope
RADAR
some tools in space are RADAR, is a system for locating unseen objects the reflections of frequency radio waves. Another tool for space is the hubble space telescope (HST). Another space tool is a space suit so you can breate oxygen if you are outside the space shuttle.
R a d a r
There are various objects that can be responsible for radio emissions in space. These objects are referred to as astronomical radio sources.
There are various objects that can be responsible for radio emissions in space. These objects are referred to as astronomical radio sources.
in a car or radio or radio playing device :)
Pulsar, since you would need some mechanical device to produce radio waves.