ACMA Allocates spectrum for emergency services

News and information about the use of radio technology in commercial or industrial environments.

Moderators: vk6hgr, Zebedee

Post Reply
vk6hgr
Site Admin
Site Admin
Posts: 2610
Joined: Thu Feb 24, 2005 10:33 pm
Amateur callsign: VK6HGR
Scanners and Receivers: Various Yaesu, Kenwood, Tait, Simoco and Philips'
Location: Perth, Western Australia
Contact:

ACMA Allocates spectrum for emergency services

Post by vk6hgr »

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
Gavin Rogers; VK6HGR
http://vk6hgr.ampr.org/
WARSUG forum administrator
Site and stream donations: https://www.paypal.me/vk6hgr
robbage
Moderator
Moderator
Posts: 2993
Joined: Sat Feb 09, 2008 10:06 am
Amateur callsign: VK6UFO_VK6RN
Scanners and Receivers:  
Scanners/receivers
Diamond Welz WS1000 wideband handheld
Radioshack Pro 28 handheld
Uniden UBC72XLT handheld
Uniden UBC73XLT handheld
Uniden UBC330CRS desktop

Two-way
Yaesu VX-3R 2m/70cm Ham TRX and wideband RX handheld
Yaesu FT-1802M 2m Ham TRX mobile x 2
Yaesu FT-7800R 2m/70cm Ham TRX and wide band RX mobile
Icom IC-208H 2m/70cm Ham TRX and wide band RX mobile
Icom IC-706MKIIG all-band all-mode Ham TRX mobile
Icom IC-V85 2m VHF Ham TRX handheld
Wouxun KG-UVD1P VHF/UHF wideband Ham TRX handheld
Wouxun KG-679P VHF wideband Ham TRX handheld
Wouxun KG-713 UHF wideband Ham TRX handheld
Location: Just on the border of your waking mind

Re: ACMA Allocates spectrum for emergency services

Post by robbage »

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?
Rob
OF78WD
 Amateur moderator
.
Arguing with a fool proves there are two
Post Reply