[AusNOG] Bandwidth in Phillip Island

[Paul Wallace]

Craig -

24GHz class license in Australia has an extremely low 20dBm EIRP limit.

Also, TDD only.

I looked at the Ubiquity 24GHz solution recently & I doubt that it complies with Australian regulations.

EIRP is calculated as TX power at the antenna port
Plus antenna gain
Minus losses typically on the cable & connectors

If you look at the attachment you'll see that a one foot 23GHz dish provides around 35dBi of gain.
Therefore you comply, you'd need to limit your TX power to -15dBm (yes that's negative 15dBm)

Please ask your local Ubiquity reseller if -15dBm TX power is configurable in this model radio to be completely sure.

As someone else pointed out earlier, larger antennas offers great support in multiple ways.

However, four foot dishes @ 23GHz offer around 46dBi of gain therefore thus requiring -26dB TX power to be configured in the radio.

So .. pretty hopeless in Australia

Cheers
Paul Wallace
MTGI








From: ausnog-bounces at lists.ausnog.net<mailto:ausnog-bounces at lists.ausnog.net> [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Craig Askings
Sent: Friday, May 04, 2012 10:02 AM
To: Alex Maclaren
Cc: ausnog at lists.ausnog.net<mailto:ausnog at lists.ausnog.net>
Subject: Re: [AusNOG] Bandwidth in Phillip Island

I was speaking specifically about the AirFiber product which works in the 24GHZ band and has a built in antenna that can not be swapped out for something larger. I was not speaking about wireless links in general.

Craig.

On 4/05/2012 9:46 AM, Alex Maclaren wrote:
I beg to differ of all this discussion about the EIRP limits in Australia meaning wireless link distances can only be 2-3km.
We have many links of over 15km operating at legal limits.
It is just a matter of having enough gain on your dishes.
For instance, if you have two BulletM5 radios and 27dbi grid dishes, over 10km operating in the 5.4GHz range, your theoretical signal is -72dBm.
This would be more than enough signal to achieve full modulation on the link.

Regards,


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