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pkhooper
join:2008-07-05
2259
| reply to Equis
Re: Power Limits in Australia?
Equis,
Yes, the documentation is confusing, however the LIPD document that you have linked to is the correct source for the information that you are looking for. There are a few other things to know though.
I will step through things for you. I will focus on frequencies that are of interest for a Wireless ISP.
1. What frequencies can we use in AU?
I will mention the LIPD Item number for reference.
915-928 - 1W EIRP - Item 45
2400-2483.5 - 4W EIRP - Item 45A
5150-5250 - 200mW EIRP - Item 44 (Indoors Only)
5250-5350 - 200mW EIRP - Item 44A (Indoors Only)
5470-5600 - 1W EIRP - Item 46
5650-5725 - 1W EIRP - Item 46
5725-5850 - 4W EIRP - Item 45B
2. What things are special about the AU bands?
915-928
Most products are developed for the US market, which is 902-928. In AU the 902-914 area is used by Vodafone for mobile RX, and if you don't use the australian band correctly you will certainly be visited by the ACMA.
Above 928 Vodafone have their GSM TX, so you do get some interference here. I suggest that you use cavity filters where you can to make your links work better.
2400-2483.5
Most products are configured the use the FCC channel plan which is 11 channels. In AU the 2.4GHz frequency band does allow for 13 channels. With the 13 channels you have more options for channel plans, with the ability to do a channels plan of 1 - 5 - 9 - 13, with 4 channels with no overlap. With 11 channels, you only have 1 - 6 - 11 with no overlap, or 1 - 4 - 8 - 11 with some overlap. Important thing to note if you are planning to use 13 channels, make sure your CPE devices can support 13 channnels also.
5470-5600
5650-5725
This band is normally called the 5.4GHz band. This is normally from 5470-5725. In AU we have been given a 50MHz exclusion zone in the middle, which is different from all other implementations around the world that I know of. This makes it tricky to deliver a solution that is fully compliant.
We also need to implement DFS (dynamic frequency selection), and TPC (transmit power control).
This band has the EIRP of 1W, that is defined as "Averaged over the entire transmission burst). Most radios are not full duty cycle, as they switch between TX and RX, and therefore you can set the EIRP over 1W to achieve the average value of 1W. I am not sure how the ACMA will police this value.
5725-5850
The EIRP in this band is limited to 4W, for both point to multipoint and point to point. In the US for point to point links you can use higher power, but not in AU, unless you are in a low population area.
If you are in a low population area, less than 20,000 people, you can apply for a registered 5.8GHz link from the ACMA and then you can implement a 200W EIRP system. This can only be used for point to point links, and you need to pay the small fee per link of $80 PA.
I think that just about covers the things that you need to know about the unlicensed bands in AU.
If you have any further questions please feel free to drop me an email.
Regards,
Patrick Hooper
Wireless Data Solutions - »www.wirelessdata.com.au | |
robbin
Premium,MVM
join:2000-09-21
Leander, TX
| said by pkhooper  :Equis, Yes, the documentation is confusing, however the LIPD document that you have linked to is the correct source for the information that you are looking for. There are a few other things to know though... Regards, Patrick Hooper Very nice explanation of a very confusing document Patrick. Thanks to a new member of our forum!  | |
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