Existing VHF Systems: Already a problem

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Presentation transcript:

Existing VHF Systems: Already a problem Existing VHF Systems: Already a problem. Not able to use adjacent channels at close distances. 20KHz Bandwidth WideBand WideBand WideBand Overlap Overlap Adjacent channels 15KHz Channel Spacing 15KHz Channel Spacing 155.745 155.760 155.775 Joe Kuran Oregon SIEC

After Narrowband: Still a problem Narrowband channels not usable until wideband users vacate. 20KHz Bandwidth 20KHz Bandwidth Wide Band Wide Band 20KHz Bandwidth Overlap Overlap Wide Band ANALOG NARROWBAND ANALOG NARROWBAND 7.5KHz Channel Spacing 11KHz Bandwidth 155.745 155.775 155.760 155.7525 155.7675 Joe Kuran Oregon SIEC

After all convert to Narrowband Still some overlay with analog modulation . This represents analog voice with a 11KHz necessary bandwidth ANALOG NARROWBAND ANALOG NARROWBAND ANALOG NARROWBAND ANALOG NARROWBAND ANALOG NARROWBAND 7.5KHz Channel Spacing 11KHz Bandwidth 155.745 155.775 155.760 155.7525 155.7675 Joe Kuran Oregon SIEC

Convert to Project 25 Digital Phase I Digital Modulation allows tighter packing of channels Still a very minor overlay in the VHF band. UHF band will have no overlay because of 12.5KHz Channel Spacing. P25 with C4FM Modulation only requires 8.1KHz Necessary Bandwidth DIGITAL NARROWBAND DIGITAL NARROWBAND DIGITAL NARROWBAND DIGITAL NARROWBAND DIGITAL NARROWBAND 8.1KHz Bandwidth 7.5KHz Channel Spacing 155.745 155.775 155.760 155.7525 155.7675 Joe Kuran Oregon SIEC

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