Information

Australia

UAV's In Australia

Location: Australia
Members: 187
Latest Activity: on Sunday

Discussion Forum

CASA's manufacturers training requirements for modified/self-built system

Started by Nikita. Last reply by Hotwire Mar 14. 3 Replies

Hi all,I am trying to get a Controller Certificate for a self-built system. Since manufacturer training is not an option, I understood that I need to generate my own “manufacturers training” and…Continue

Sydney meetup?

Started by Tommy Le. Last reply by Alex Wong Nov 10, 2014. 10 Replies

Hi guys,I'm Tommy, based in Sydney. I'm a beginner. Wondering whether there is a recent/active group of builders, flyers. Most of the 'fly day' proposals were in the past.Tommy.Continue

For sale

Started by Todd Oct 9, 2014. 0 Replies

Just in case anybody is interestedhttp://pages.ebay.com/link/?nav=item.view&alt=web&id=111482077882Continue

ARRIS 2 Axis 360 gimbal for sale

Started by JimmyO. Last reply by JimmyO Sep 13, 2014. 1 Reply

Hi All,Now that I am moving to fixed wing UAS, I no longer require the gimbal that I had bought when I thought that I would be building a Hex.  The gimbal is still in the original box and has not…Continue

Comment Wall

Comment

You need to be a member of Australia to add comments!

Comment by Warren Eather on March 16, 2015 at 11:15pm
Yep, Tim it's exactly the same document. Smug rights are all yours.
And your right again. You would need an antenna of a gain greater than 10db to get yourself in trouble with the 3DR 915 at maximum output. That's another reason to get the 915 over the 433.
Comment by Tim on March 16, 2015 at 10:42pm

At the risk of sounding smug, that ACMA document is precisely the one I linked to previously...

Warren, your EIRP point is a very pertinent one. However for the 3DR radios at least, they max out at 20 dBm which is far below the 30 dBm threshold with a vanilla setup.


Developer
Comment by Bill Bonney on March 16, 2015 at 10:42pm

@Mitchell Berry: Radio Amateur take undertake study of how radio transmission work. How to build antenna and how to detect and mitigate the reception and the transmission of radio waves on unwanted frequencies (interference). Due to this expert knowledge they are allowed to do more with more power. 

They still have a non-commercial license, and the expectation to help with communications in emergency situations.

Comment by Mitchell Berry on March 16, 2015 at 9:53pm

Supposedly you are allowed much more power from 433MHz with an amateur radio license.

I can't actually work out what a licensed radio operator does that makes them more capable of using that band? Is there some sort of CB frequency to announce your intentions to other people around? Doesn't make any sense to me.

Comment by Warren Eather on March 16, 2015 at 9:35pm
Thanks Hotwire, that's a good document.
It's important to note that the maximum power stated refers to the Equivalent isotropically radiated power EIRP, that is transmitter power + antenna gain and not just the transmitter power.
So for example if you had your RFD900 and a 3db antenna the maximum transmitter power setting to achieve a EIRP of 1W or 30dBm would be 30dbm-3db= 27dbm = 500mw that's half power!!
Comment by Hotwire on March 16, 2015 at 2:55pm

I have written to ACMA and I'm happy to concede I am wrong.

Attached is the document that ACMA sent to me. It contains schedule 1 radio users regulations and is most likely what you have already referenced or a derivative.

Thanks Mitchell & Tim. Ego bent but not broken.

LIPD.pdf

Comment by Duncan Greer on March 15, 2015 at 1:27pm

Its worth noting that the band in Australia is 915 to 928 MHz, as opposed to North america where the band is 902-928 MHz.. perhaps this is where the confusion is coming from??  

Comment by Mitchell Berry on March 15, 2015 at 12:32am

I'm amazed you keep persisting Hotwire, despite so much evidence to the contrary. Tim's link has the actual legislation regarding transmitter power, the law is a much more complicated than your pdf overview.

Item 52 explicitly says 1W of power at 915 MHz if there is a minimum of 20 hopping frequencies.  

Item 17 says a max of 25mW for 433Mhz

52

Frequency hopping transmitters

915–928

1 W

A minimum of 20 hopping frequencies must be used.

17

All transmitters

433.05–434.79

25 mW

The 3DR Radio regulations page says the same and provides settings for telemetry radios used in Australia to comply with these standards. 

http://copter.ardupilot.com/wiki/common-optional-hardware/common-te...

Australia 3DR 900 MIN_FREQ: 915000
MAX_FREQ: 928000
NUM_CHANNELS>=20
LIPD-2000 item 52
Australia 3DR 433 MIN_FREQ: 433050
MAX_FREQ: 434790
TXPOWER<=14

LIPD-2000 item 17

Comment by Tim on March 15, 2015 at 12:15am

That's a very pretty way of proving my point. Thank you.

Comment by Hotwire on March 14, 2015 at 11:51pm

Follow the link and know the spectrum HERE

 

Members (187)

 
 
 

© 2015   Created by Chris Anderson.

Badges  |  Report an Issue  |  Terms of Service