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IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITTERS!

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IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITTERS!

Postby GarethRens » Tue Aug 14, 2012 10:52 am

From what I gather reading the attached file.
Most of the frequencies we use are licenced to other people, including the 2.5 and 5.8ghz bands.
What matters here I suppose is the wattage of your transmitter.
This however doesnt apply to the 900 and 1800mhz bands, as even a small mobile transmitter causes a call drop rate of up to 40% on cell towers.

Transmitting on any frequency is kinda alright (except the 900 and 1800 bands) provided its a low wattage transmitter. What is a low wattage transmitter? I have no idea!
Probably something below 250mw?

The only companies/bodies that have the ability to track your transmitter down would be the cell operators. They'll locate the disrupted cell, then drive around with a scanner till they find you. This is problematic for them as we dont transmit constantly. So unless you go to the field every saturday from 9am to 4pm. They're gonna have a bitch of a time finding you.
However if you do see a white van with aerials sticking out of it driving around, RUN! lol

The problem is mainly for us, with regards to interference and dropped calls. Especially for long range telemetry links.

If we have an RF Engineer anywhere on the forum, a comment or correction would be greatly appreciated!


The 900mhz band is a no go, as it is licenced by the cell phone operators.

1.3ghz is half fine, provided your transmitter is below 1.350ghz. Otherwise the traffice will be pissed off, not that they have scanners to find out who's doing what.

1517 - 1525 MHz is unused.

1710 - 1880 MHz is once again used by the cell phone operators. Ergo dual band 900/1800GSM.

1880 - 1900 MHz is used by telkom.

1900 - 1920 MHz is used by telkom again

2025 - 2110 MHz // 2200 - 2285 MHz is used by the CSIR and is kinda available for low capacity links.

1920 - 1980 MHz // 2110 - 2170 MHz (FDD) is used by the cell operators for 3G

2300 - 2483.5 MHz is also used by telkom, eskom and a few others.

2500 - 2690 MHz is used by Sentech

3400 - 3600 MHz is also used by Sentech, neotel and telkom.

3.6 - 4.2 GHz Telkom

4488 - 4684 MHz & 4800 - 5000 MHz SANDF (I didnt know they still existed...)

4400 - 4490 MHz & 4690 - 4800 MHz Telemedia and Mnet

5.85-6.725 GHz WBS, Neotel and telkom


for the rest of the bands see the attached file:
spectrum-usage_Q1-2012.xlsx
(31.85 KiB) Downloaded 436 times


Hope this helps

G:)
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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby JohanMoelich » Tue Aug 14, 2012 1:23 pm

2.4GHz is free to use as long as your power output is below a certain power output level (don't know what that level is)
1.5GHz or somewhere in that vicinity is used by GPS (including our OSDs which have GPS functionality)
5.8GHz as far as I know is open for use as long as you're below a certain power output level (no idea what that level is)

I might be wrong but that's what I remember from my sniffing around the 'net for answers.
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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby robone » Tue Aug 14, 2012 1:28 pm

I believe that 433Mhz is available for data links.
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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby JohanMoelich » Tue Aug 14, 2012 1:39 pm

433MHz or somewhere in that frequency range is used for garage door openers, car remotes, and two-way radios. That tells me that it is fairly open to use, as long as you're under a certain power output level.
It is also used for UHF long range radio systems such as for FPV use (EZUHF, Dragonlink, etc).
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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby hennisdk » Tue Aug 14, 2012 1:48 pm

I have heard that if you use the 433Mhz band, you have to have a HAM license, doesn't matter what power you are using.

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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby JohanMoelich » Tue Aug 14, 2012 1:55 pm

A HAM license might be a good thing to have.
It seems that SAMAA is not very eager to allow 433MHz at their fields. I was denied membership because of this.
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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby hennisdk » Tue Aug 14, 2012 2:01 pm

Moelich wrote:A HAM license might be a good thing to have.
It seems that SAMAA is not very eager to allow 433MHz at their fields. I was denied membership because of this.


Maybe if you have a HAM license they would accept your membership, then you are personally licensed for that range.

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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby JohanMoelich » Tue Aug 14, 2012 2:06 pm

They didn't even ask if I have a HAM license or not.
My guess is they don't want to go through the effort of doing some research into other frequencies, or they can't get ICASA to give them any concrete info.

In the end I'm almost glad I didn't get in, as it would get boring flying FPV at the same field every weekend.
Last edited by JohanMoelich on Tue Aug 21, 2012 2:04 pm, edited 1 time in total.
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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby GarethRens » Tue Aug 14, 2012 2:11 pm

Or can't find anything on the icasa website! ;)
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Re: IMPORTANT LEGAL FREQUENCIES 4 ANY1 BUYING VID. TRANSMITT

Postby JohanMoelich » Tue Aug 14, 2012 2:13 pm

Hehe that's probably it!

At the rate FPV is growing, SAMAA will have to look into this part of the hobby more closely sometime soon or lose out on a lot of members.
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