27 MHz vs. 75 MHz

[AnimeKing]

I don't think I've ever come across this on the message boards. Can anyone tell me the difference, if there are benefits and what not.

I'm getting an Airtronics M8...also it's FM right? So FM and AM are on 27 and 75 MHz?

Thanks!

[Distro]

27mhz are spaced farther apart for less interference in close channel (like channel 72 and 73 may have some conflicts (rarly though)). The other hting is there are much more channels avalible for 75mhz, which is why most people use it. Check at your track though, if alot of people use 27mhz your better off with 75.

[atm92484]

75 mhz is a stronger signal compared to 27 mhz. Also though since all radios now are narrow band its extremely rare for interference to occur between close channels. Also remember "toy" cars are on 27 mhz so they can interfere with your car. This is the main reason why I'll never get a 27 mhz radio.

[Clayton]

75 band is for surface use in North America, we have 30 channels to chose from.

27 band is used in many Countries, the US it for Surface and air, Canada only surface. ALL toy RC companies ie: Radio Shack and Nikko use 27 band because their products get sold world wide. With only 6 of the 10 channels available, it makes it more difficult to avoid conflict/interference from others. This is why all RTR'rs are 27 band, with the exception of a few now offering 75 for the North American market.
40 band is for Asia, Europe and some other over seas companies...(Illegal in North America)

[ 07-19-2001: Message edited by: Clayton ]

[krayzie]

27mhz is NOT FCC ( the AMA does not allow it eaither)legal or used for aircraft ..only 72mhz is.. 27mhz has more space between each band but other then that there is not much difference between them( other then the 75's more bands and less spacing).........

Krayzie http://www.plauder-smilies.de/tales/grim.gif

[ 07-18-2001: Message edited by: krayzie ]

[Clayton]

27 band in the USA is legal for Aircraft, and if it isnt, they very recently changed the laws. I cant find the chart I use to have that explained all this.

[Leet TC3]

There is no difference in the strength of the 27 or 72 band.

Also, correct me if I a wrong - while it is true that toy cars use the 27 band, it is not narrowed down with a crystal like our cars are. What this means, as I understand it, is that a toy car controller will never be able to override our radios, and can only control our cars from a VERY CLOSE distance.

[atm92484]

I fly and I know 27 mhz is legal for aircraft use. No one uses it though because its such a general frequency. Glitching with a car means a flip or something usually; glitching with a plane means you just bought the farm. :D

27 is the weakest of the signals. Surface radios are at 75 mhz because they need the strongest and most reliable signal. They are close to the ground so its like having a tower for cell phones 5 feet off the ground; it wouldn't pick up as well and a stronger signal is needed. Since planes are up in the air they can run reliably on 72 mhz.

This is what I've been told and read many times. If someone finds and article to prove me wrong then I guess this isn't true.

[Clayton]

27 band is more susceptible to interference, As stated by someone already, 27 is not narrow band , this is noted by the silver tag on the controller, not the gold narrow band tag.

[clancy]

some of my sons radio shack toys are on 49mhz anyone know why this freq is used on toys but hobby grade equip does not use it? :confused:

[Clayton]

Methaneman, They probably run a very weak signal. Or are a specified channel for use with toys..

[steveaggie]

27Mhz is no more susceptible to noise than 75Mhz. Assuming both are frequency modulated, the only difference is the carrier frequency that is modulated. Also, one frequency is NOT stronger than another. Strength comes from the power of the transmitter not how often the carrier oscillates per second.

[Grizzbob]

Very true. I have radios on both bands(have used both for all of my 12+ years racing), & I haven't noticed any difference in resistance to glitching, or range. What really matters most is how you set everything up on your car, where the electronics are placed, how they're wired, & keeping your motor in top condition & set up correctly(for brushes & the right springs to prevent arcing)..... :)