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27mhz vs 75mhz

Old 06-13-2005, 01:23 AM
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Rondo1
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Default 27mhz vs 75mhz

Hey guys. Newbie here and my first post!

Can someone please tell me what the difference is between 27mhz vs 75mhz radios? I'm going to get the new Airtronics MX-3S, but don't know what the difference is between the 27mhz and 75mhz versions. Can someone help me understand the difference or advantage of one over the other?

Thanks
Old 06-13-2005, 06:10 AM
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gerwen
 
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Default RE: 27mhz vs 75mhz

For your synth radio, 75Mhz has the advantage of more channels. 27Mhz only has 6 channels where 75Mhz has 30(iirc).

Also, much more consumer radio equipment runs on 27Mhz (radio shack toys and such) so you have less likelihood of interference.

Unless you have a reason not to go with 75Mhz, use it over 27Mhz.
Old 06-13-2005, 07:36 AM
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Engrose
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Default RE: 27mhz vs 75mhz

I guess that you're from the US, but if you aren't then you should be aware that 27 mhz is allowed over most of the world. In US 75 mhz is allowed and 40 mhz is illegal where it in Europe is the opposite.

27 mhz does have more than 6 channels, there can be up to 36 legal channels on the 27 band depending upon the local rules. But it's correct that the chances of interference is much greater on the 27 mhz band.
Old 06-14-2005, 08:34 AM
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Default RE: 27mhz vs 75mhz

ORIGINAL: Engrose
27 mhz does have more than 6 channels, there can be up to 36 legal channels on the 27 band depending upon the local rules.
While this may be true elsewhere or previously, in north america, there are only 6 channels available on 27Mhz. A1 through A6.
I don't believe there are any consumer level radios made recently that have any 27Mhz capability outside these six channels.

I could be wrong, but any [link=http://www.commandline.net/Radio%20Frequency%20Chart1.htm]radio frequency chart[/link] I've ever seen only has A1 through A6.

Old 06-14-2005, 01:54 PM
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Default RE: 27mhz vs 75mhz

ORIGINAL: gerwen

ORIGINAL: Engrose
27 mhz does have more than 6 channels, there can be up to 36 legal channels on the 27 band depending upon the local rules.
While this may be true elsewhere or previously, in north america, there are only 6 channels available on 27Mhz. A1 through A6.
I don't believe there are any consumer level radios made recently that have any 27Mhz capability outside these six channels.

I could be wrong, but any [link=http://www.commandline.net/Radio%20Frequency%20Chart1.htm]radio frequency chart[/link] I've ever seen only has A1 through A6.

Engrose is right! But he should have put this way: there WERE...
I have a pair of crystals freq 27.998. I guess they are older than me! I don't know why, but today there are only 6 channels available on the 27Mhz band.
Old 06-14-2005, 06:18 PM
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Default RE: 27mhz vs 75mhz

No not were - In Denmark the following frequencies are allowed for the 2005 season:

The normal ones that you can be sure of:

26.995 Mhz
27.045 Mhz
27.095 Mhz
27.145 Mhz
27.195 Mhz
27.255 Mhz
40.665 Mhz
40.685 Mhz
40.695 Mhz

And the following, which has to be approved every year:

26,815 - 27,085 - 40,735 -
26,825 - 27,105 - 40,765 -
26,835 - 27,115 - 40,775 -
26,845 - 27,135 - 40,785 -
26,865 - 27,155 - 40,815 -
26,885 - 27,165 - 40,825 -
26,905 - 27,185 - 40,835 -
26,935 - 27,205 - 40,865 -
26,965 - 27,215 - 40,875 -
26,975 - 27,235 - 40,885 -
26,985 - 27,245 - 40,915 -
27,005 - 27,265 - 40,925 -
27,015 - 27,275 - 40,935 -
27,035 - 40,640 - 40,965 -
27,055 - 40,715 - 40,975 -
27,065 - 40,725 - 40,985 -

I admit that there isn't 36 channels on the 27 mhz band - there is only 35

Old 06-17-2005, 05:10 AM
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Default RE: 27mhz vs 75mhz

Just wondering if im allowed to use a 75Mhz radio in the UK? Is it illegal? I wouldnt be racing only bashing. Reason is I want to buy a radio from the US (obviously because its cheaper) but i dont want it to come and then find out its illegal!

Thanks
Old 06-17-2005, 06:13 AM
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Default RE: 27mhz vs 75mhz

75 mhz is not allowed to be used in Europe. And it doesn't matter if you're racing or bashing. The 75 mhz-band is reserved for other purposes in Europe. In Denmark it's for the army and propably it's the same in UK.
When you look at the prices in the US, then you need to remember that the shipping rates are high and there is taxes and vat to consider.
If you want to buy abroad, then look at Hong Kong where they have 40 mhz. Another possibility is to search the german market where prices can be rather competitive.

The chance of getting in trouble if you use the 75 mhz for bashing is slim, but the penaltie can be rather high since you could in theory create troubles for airtraffic communication.
Old 06-17-2005, 06:26 AM
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Default RE: 27mhz vs 75mhz

ORIGINAL: Engrose

I guess that you're from the US, but if you aren't then you should be aware that 27 mhz is allowed over most of the world. In US 75 mhz is allowed and 40 mhz is illegal where it in Europe is the opposite.

27 mhz does have more than 6 channels, there can be up to 36 legal channels on the 27 band depending upon the local rules. But it's correct that the chances of interference is much greater on the 27 mhz band.
Why is 40mhz illegal? Or any other frequency other than 27, 49, 72, & 75?
Old 06-17-2005, 06:34 AM
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Default RE: 27mhz vs 75mhz


ORIGINAL: zr1s10

Why is 40mhz illegal? Or any other frequency other than 27, 49, 72, & 75?
There is only a certain amount of available frequencies and then it is up to the authorities to decide which bands that are allowed to be used for what. So in US 40 mhz aren't illegal in general, but it's illegal for r/c-use.

In my opinion it's rather irritating that they haven't agreed to use the same frequencies to the same purposes all over the world.
Old 06-17-2005, 07:57 AM
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Default RE: 27mhz vs 75mhz

I dont quite understand what are those other frequencies used for?
Old 06-27-2005, 07:38 AM
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nedMX
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Default RE: 27mhz vs 75mhz

well mate, in australia the 75mhz frequency is disallowed for Rc use cause that band is reserved for national forces. the governent controls the different frequencies and they desengate which frequencies different things operate on.

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