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A radio that is capable of transmitting and receiving is known as two way VHF radios. They are different from broadcast receivers that are only capable of receiving content. Here the operator is allowed to have conversations with other similar devices that are being operated on the same radio 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.
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.
There are various types depending on their individual attributes. One would be the conventional, which has the capacity to operate on fixed RF channels. They will only operate on one channel at a time even in the case of there being multiple channels to begin with. The proper channel would be selected by the user.
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.
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.
There are various types depending on their individual attributes. One would be the conventional, which has the capacity to operate on fixed RF channels. They will only operate on one channel at a time even in the case of there being multiple channels to begin with. The proper channel would be selected by the user.
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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