Splash drone modification
Hi I'm new here from Melbourne, I bought a splash drone fishing drone. It was ok never flew quite as nice as my old phantom 3 ever did. Anyway it run out of battery 350m out to sea and took a load of water and everything is toasted. It does turn on but won't arm. Im thinking of gutting it but motors and the drop mechanism and putting a custom drone internals Now I literally have no idea where to begin with this. All I need is 500m range and GPS return to home and a trigger for drop mech . I…Read more…
I believe you'll find that the range for 433Mhz@25mW is about the same as 913Mhz@100mW the signal strength and propagation loss for the 913 is about 6db greater than the 433.
From a purely technical perspective theres no reason to chose 915 over 433. The lower the freq the more range and penetration thru objects. Given 433 is also legal in oz, why would anyone pick 915 here ?
915 MHz it is, then :)
Heh... What Adam said :p
@Hotwire, that i just not true - check your facts. 915-928MHz band is covered by the LIPD Class License 2000 of the 1992 Telecommunications Act. The only overlap here is with ISM devices (ie. non telecommunications uses). 915-928MHz may be used by Frequency hopping transmitters up to 1Watt (Paragraph 52).
Sorry "item number " not article number :/
Yes certain types of transmitters are used for 3G on this band, HOWEVER Frequency hopping transmitters may be used between the frequencies of 915-928 up to 1W of power as long as at least 20 hopping frequencies are used. Both the 3DR radios and the RFD900's fall into this category.
this is outlined in article 52 in this Gov regulation document: http://www.comlaw.gov.au/Details/F2011C00543
which is why companies selling items such as this can claim it can be used license free in Australia:
Whereas the only provisioned use of 433mhz is up to the power of 25mW for any type of transmitter unless you hold an amateur radio license.
915MHz is used for the 3G phone network in Australia. It has no legal threshold and you will get fined if you get caught. 433MHz is mixed use with threshold restrictions and is legal for this kind if stuff. 433Mhz has better qualities for telemetry.