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Two way VHF radios are the ones that are capable of both transmitting and receiving. This is in contrast to other variants such as broadcast receivers where they only receive content and nothing more. For this variant, the user may converse with others utilizing the same or similar devices on practically the same frequency.
Note that there are several variations that exist in the world today. They range from mobile products all the way to hand held portable variants and stationary based ones. Popularly known as walkie talkies, the hand held variation can go by several other unique names, one of which being handie talkies and several others.
These systems operate in a half duplex mode where the operator can talk and he or she can listen, but never simultaneously. Usually, a button is pressed in order to activate the transmitter. Upon its release the receiver becomes active. A mobile phone is a notable example wherein it both receives and transmits at the exact same time. That situation is referred to as a full duplex mode.
As far as the full duplex is concerned, there exists two different frequencies to be utilized. The purpose is to carry on two directions at the same time and to make sure the conversation is occurring as smoothly as it can go. This is on the rise a few years back and is now very common.
As far as its history is concerned, two way telegraphy traffic was already commercially available across the Atlantic Ocean by the year 1907. By 1912, transmitters and receivers were being carried by both commercial and military ships. It allowed for communication between ships that were not within their respective sights.
Senior Constable Frederick William Downie, a man from the Victorian Police, was the one to develop the first mobile version. It was innovated in Australia, meaning the Victorian police utilized wireless communication well before everybody else in the world. This became the standard form of reporting statuses, effectively replacing every other method that came before it.
Different types exist, each one with its own unique and individual feature. One example would be the conventional variations. It is made to operate within fixed RF channels. A channel can be operated one at a time, even when there are multiple channels to choose from. It is within the discretion of the user to select the channel.
Another different type is the trunked system. The trunked has the inherent capability to be able to pick up frequency channels that are physical in nature and immediately at that. Protocols have been set so that the relationship between radio and its supporting backbone is appropriately defined. This protocol can also allow for assignments to automatically take place.
There are many more things to be discussed and dissected when it comes to two way VHF radios. One of these would be the many frequencies, which are assigned in a different manner depending on where you are since they vary from country to country. The selections are often affected by government regulations and licensing, the presence of interference, intermodulation and noise, the availability, the terrain and a lot of other factors.
Note that there are several variations that exist in the world today. They range from mobile products all the way to hand held portable variants and stationary based ones. Popularly known as walkie talkies, the hand held variation can go by several other unique names, one of which being handie talkies and several others.
These systems operate in a half duplex mode where the operator can talk and he or she can listen, but never simultaneously. Usually, a button is pressed in order to activate the transmitter. Upon its release the receiver becomes active. A mobile phone is a notable example wherein it both receives and transmits at the exact same time. That situation is referred to as a full duplex mode.
As far as the full duplex is concerned, there exists two different frequencies to be utilized. The purpose is to carry on two directions at the same time and to make sure the conversation is occurring as smoothly as it can go. This is on the rise a few years back and is now very common.
As far as its history is concerned, two way telegraphy traffic was already commercially available across the Atlantic Ocean by the year 1907. By 1912, transmitters and receivers were being carried by both commercial and military ships. It allowed for communication between ships that were not within their respective sights.
Senior Constable Frederick William Downie, a man from the Victorian Police, was the one to develop the first mobile version. It was innovated in Australia, meaning the Victorian police utilized wireless communication well before everybody else in the world. This became the standard form of reporting statuses, effectively replacing every other method that came before it.
Different types exist, each one with its own unique and individual feature. One example would be the conventional variations. It is made to operate within fixed RF channels. A channel can be operated one at a time, even when there are multiple channels to choose from. It is within the discretion of the user to select the channel.
Another different type is the trunked system. The trunked has the inherent capability to be able to pick up frequency channels that are physical in nature and immediately at that. Protocols have been set so that the relationship between radio and its supporting backbone is appropriately defined. This protocol can also allow for assignments to automatically take place.
There are many more things to be discussed and dissected when it comes to two way VHF radios. One of these would be the many frequencies, which are assigned in a different manner depending on where you are since they vary from country to country. The selections are often affected by government regulations and licensing, the presence of interference, intermodulation and noise, the availability, the terrain and a lot of other factors.
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