72 mhz remote control band

[Suwaneeguy]

I got to thinking about why UAV's today are using such high frequency bands.
That is, 2.4ghz and 5.8ghz.

72 mhz has been set aside strictly for aerial remote control use.
So why not use it?
There are 50 designated channels.
No license required.

A 1 watt signal should give you ten times more range.
Less likely to have other interference.

Comments por favor.

 

[Nidge]

72MHz is still used but usually on large scale aircraft. The reason is that 72MHz has a wavelength of about 4 metres and therefore the minimum length of the receiver antenna, to be efficient, would have to be about a metre in length, a quarter wavelength.

Regards

Nidge

 

[locoworks]

the problem with all the old flying frequencies is that they are not locked once selected like 2.4 ghz stuff. if you used old stuff and flew near someone else on the same frequency it would likely result in a crash/loss of aircraft. if you are at a flying field where you can see all the pilots and have a peg system so no one switches on on the same frequency it is relatively safe ( stupid people do get round that though :evil: ). that is why certain frquencies were used for specifically for air and land based models so an rc car didn't bring down rc aircraft in the same area. i'd use 72 on camera controls cos they aren't flight critical, but not on flight controls.