> VHFHomepage >VHF Introduction
> VHFHomepage >VHF IntroductionI have been working with applications of VHF radios for the past ten years.
The radio design has changed for the better over the years and a lot of industrial data/voice application can be designed using them. The VHF radios will
always be compared with cellular radios, which though being more popular and versatile have some disadvantages like low cell range and recurring monthly
air time rental cost.
The VHF radios can also be used for DTMF signaling and remote relay
operation which is quite beneficial in industry. This requires programming the radio accessory port pins accordingly. One of my projects required
transferring of numbers from 000-999 between two points which was done with the help of a
micro controller connected to the accessory port of a VHF radio . Similarly a sensor ON/OFF signal can be
transferred between two points with help of programming the accessory port port pins as emergency switch &
emergency alarm functions in master & slave radio respectively.
The chargeable Ni-cd batteries is another aspect of the radio manufacturers
typically give a warrantee of two years on the radio but NOT on the battery.
The average life of the battery is two years, but in industry if proper charge control is not followed up (seldom happens), the battery dies in a
year.
All these aspects are covered in the VHF section of my web .
Any comments are welcome.
> VHFHomepage >VHF Introduction