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.
The systems usually operate in the half duplex mode. This is when the operator is capable of talking as well as listening but he or she is incapable of doing this at the same time. Typically, a button can be pressed so that the transmitter is activated. When released, the receiver is active. One notable example of the full duplex mode is the mobile phone, which transmits and receives at the same time.
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.
Taking a look at its history, the year 1907 was the year telegraphic traffic became commercially available in a two way form across the Atlantic Ocean. Pretty soon, both commercial ships and military ships started to carry transmitters and receivers by 1912. This allowed for distant ship communication.
The very first variant that was truly mobile was first developed in Australia back in 1923. It was developed by Senior Constable Frederick William Downie of the Victorian Police. It is recorded that the Victorian police were among the first to make use of wireless communication in their cars. As a result, the inefficient manner of status reporting through public phones was replaced.
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 considerable more topics that can be dissected and discussed as far as two way VHF radios are concerned. Among them would be the various frequencies that are assigned differently depending on the region or country that the user is currently located. These selections may be affected by the availability, the noise, presence of intermodulation and interference, the terrain, government licensing and regulations and many other varying 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.
The systems usually operate in the half duplex mode. This is when the operator is capable of talking as well as listening but he or she is incapable of doing this at the same time. Typically, a button can be pressed so that the transmitter is activated. When released, the receiver is active. One notable example of the full duplex mode is the mobile phone, which transmits and receives at the same time.
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.
Taking a look at its history, the year 1907 was the year telegraphic traffic became commercially available in a two way form across the Atlantic Ocean. Pretty soon, both commercial ships and military ships started to carry transmitters and receivers by 1912. This allowed for distant ship communication.
The very first variant that was truly mobile was first developed in Australia back in 1923. It was developed by Senior Constable Frederick William Downie of the Victorian Police. It is recorded that the Victorian police were among the first to make use of wireless communication in their cars. As a result, the inefficient manner of status reporting through public phones was replaced.
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 considerable more topics that can be dissected and discussed as far as two way VHF radios are concerned. Among them would be the various frequencies that are assigned differently depending on the region or country that the user is currently located. These selections may be affected by the availability, the noise, presence of intermodulation and interference, the terrain, government licensing and regulations and many other varying factors.
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