legitimate 5.8GHz frequencies in Aus?

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legitimate 5.8GHz frequencies in Aus?

Postby pldb64 » Tue Apr 10, 2012 4:22 am

Hi All,

I've been combing the ACMA website trying to find a statement that indicates what frequencies can legitimately be used for FPV use in the 5.8GHz band.

I know that Bruce has indicated in either previous posts and/or youtube videos that the immersion frequencies are NOT usable in NZ, but was trying to find a statement as to what IS usable.

To that end, i've found that FPV appears to be covered under the Low Interference Potential Devices class license.

http://www.acma.gov.au/WEB/STANDARD/pc=PC_297

Within the policy there is a statement as follows:

"Video sender transmitters

Video sender transmitters are used to transmit signals from video appliances such as video cassette recorders to nearby television receivers, by means of radio transmissions. "

Kinda sounds like us right?

Then within the condition of operations section it refers to industrial, scientific and medical devices (ISM) as follows:

"LIPDs operating in bands designated for industrial, scientific and medical (ISM) applications will not be afforded protection from interference which may be caused by ISM applications (e.g. microwave ovens). The ISM bands are:

2400-2500 MHz
5725-5875 MHz"

That seems to indicate to me that the 5725-5875 frequencies shouldn't be used?

And thats all i've been able to find.

Can anyone point to something more definitive (perferably a positive statement) that indicates which frequencies can be used legitimately?

Thanks
Peter
Turnigy 9x, FrSky 2-Way/Telemetry DHT DIY, Smartieparts BRD, ER9x FW
AXN-Floater (stock esc, motor & prop, HK orange 9g servos)
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Re: legitimate 5.8GHz frequencies in Aus?

Postby RCModelReviews » Tue Apr 10, 2012 9:43 am

From what I can see, the legal 5.8GHz frequencies for Australia are those allocated to the ISM band (5.725 to 5.875MHz).

The adjacent parts of the 5.8GHz band (ie: around 5.7 to 5.9 seem to be allocated for similar uses -- albeit not on an ISM basis.

This means that the FoxTech type 5.8GHz systems are probably not strictly legal - since their frequencies are actually outside the ISM band on a range from 5.645 through 5.945GHz.

The reality is that unless you're a radio HAM, there aren't many legal frequencies you can use for FPV with useful power levels or freedom from 2.4GHz RC interference.

The benefit of 5.8GHz (legal or otherwise) is that it's a signal that doesn't carry very far (compared to lower frequencies) and any other service which might be using the 5.8GHz band for anything significant will almost certainly be using directional antennas that will make the chance of interference to/by those services very, very low indeed when you're flying FPV.
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Re: legitimate 5.8GHz frequencies in Aus?

Postby Allan Warner » Tue Apr 10, 2012 12:23 pm

Is the list below of any use. Copied(post#30) from this thread on FPVLABS http://fpvlab.com/forums/showthread.php ... GHz-ranges

about the channels and wifi:

WIFI 5,8GHz:
channel freq. GHz
36 5,180 EU, USA, Japan
40 5,200 EU, USA, Japan
44 5,220 EU, USA, Japan
48 5,240 EU, USA, Japan
52 5,260 EU, USA
56 5,280 EU, USA
60 5,300 EU, USA
64 5,320 EU, USA
100 5,500 EU
104 5,520 EU
108 5,540 EU
112 5,560 EU
116 5,580 EU
120 5,600 EU
124 5,620 EU
128 5,640 EU
132 5,660 EU
136 5,680 EU
140 5,700 EU
147 5,735 USA
151 5,755 USA
155 5,775 USA
167 5,835 USA

Airwave 5,8GHz
1 5,740
2 5,760
3 5,780
4 5,800
5 5,820
6 5,840
7 5,860

SKY-RF 5,8GHz (Foxtech, BEV, ...) (not Rangevideo)
1 5,705
2 5,685
3 5,665
4 5,645
5 5,885
6 5,905
7 5,925
8 5,945
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Re: legitimate 5.8GHz frequencies in Aus?

Postby rogueqd » Sun Apr 15, 2012 1:30 am

I followed the acma link in the first post and found a table of frequencies that included this...

Code: Select all
Class of transmitter     Permitted operating frequency band (MHz)              Maximum EIRP
                         (lower limit exclusive, upper limit inclusive)
   
All transmitters         5725–5875                                             25 mW


Based on this, a Foxtech/HobbyKing transmitter is legal only on channel 2 (5865) and only if it transmits at 25mW or less.

Yarrrr, baton down the airwaves thar be skallywags a-flying today.
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Re: legitimate 5.8GHz frequencies in Aus?

Postby RCModelReviews » Sun Apr 15, 2012 5:30 am

Yet strangely enough -- not a single publicised reported instance of a 5.8GHz FPV system interfering with any other (legal) users of the 5.8GHz band :D
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