ACMA Allocates spectrum for emergency services

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ACMA Allocates spectrum for emergency services

Post by vk6hgr » Fri Nov 02, 2012 8:06 am

An interesting analysis of ACMA's recent allocation of 10MHz of spectrum in the 800MHz band for emergency services.

http://www.radiocomms.com.au/articles/5 ... LL%20STORY
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Re: ACMA Allocates spectrum for emergency services

Post by robbage » Fri Nov 02, 2012 4:29 pm

This is quite important, as the laws of physics outline that as you move away from the fixed infrastructure point the data rate to a mobile unit falls away. Try it with your own Wi-Fi connection - move away from the service point and watch the data rate fall down fairly quickly. The same will happen with any PSMB system, so as the vehicles move away from the main transmitter location the data rate will fall. Effectively the 10 MHz will quickly be down to 5 MHz, with message retries and error correction techniques.
So does the 10 MHz reduce by 2.5 MHz either side of centre or does 5 MHz fall off one end?
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