How does radio communication work?
Radio works by transmitting and receiving electromagnetic waves. The radio signal is an electronic current moving back and forth very quickly. A transmitter radiates this field outward via an antenna; a receiver then picks up the field and translates it to the sounds heard through the radio.
What type of communication does a radio use?
In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking and satellite communication among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information …
How much frequency is harmful for humans?
Despite the advent of numerous additional research studies on RF fields and health, the only established adverse health effects associated with RF field exposures in the frequency range from 3 kHz to 300 GHz relate to the occurrence of tissue heating and nerve stimulation (NS) from short-term (acute) exposures.
Which is better continuous air flow or cycle Sentry?
Continuous air flow allows for more consistent temperature throughout the trailer for the duration of transport. All reefer units have a ‘Set Point’. For example, if you have a set point of 33°F, the temperature reading displayed by the set-point will stay constant on a smart reefer download.
When to use cycle sentry or continuous on a reefer?
Below is an example of a temperature recorder printout for a reefer in continuous mode (note spike at end of 41°F is at unloading point: Cycle Sentry: Cycle-Sentry setting should only be used for frozen loads, i.e. loads that are intended to ship colder than 24°F.
When to use continuous air flow in a trailer?
Continuous setting must be used for produce loads, as they need continuous air flow to handle the heat of product respiration. Continuous air flow allows for more consistent temperature throughout the trailer for the duration of transport.
When to use cycle sentry on a load?
Cycle-Sentry setting should only be used for frozen loads, i.e. loads that are intended to ship colder than 24°F. Frozen loads can handle more significant temperature variances without causing damage to the product.
How does a radio station need backup power?
1. Assess station requirements 2. Design backup power system 3. Purchase & Install 4. Test Monthly Equipment Decisions Generator –Plug 120v stuff in –Need power supplies to run 12vdc equipment –Gas, oil, maintenance Battery System
How did the 24 hour news cycle come about?
Although all-news radio operated for decades earlier, the 24-hour news cycle arrived with the advent of cable television channels dedicated to news and brought about a much faster pace of news production with an increased demand for stories that could be presented as continual news with constant updating.
Is there a way to power up a radio?
Below is a diagram of a simple device you can make that will enable you to power up your radio without destroying the power transformer or causing damage. You will need to be able to make this simple test jig using a light bulb, lamp socket and AC receptacle.
What happens when you power up an old radio?
Applying power to them for the first time in many years can be catastrophic. Few of these old radios (and this applies to old TV’s as well) have no fuse protection. When something shorts out (such as a filter capacitor), something’s going to smoke or burn out.