All
Found this thread on a web site when surfing this afternoon....
http://www.largemodelassociation.com/viewtopic.php?f=6&t=1954 (http://www.largemodelassociation.com/viewtopic.php?f=6&t=1954)
Now im pretty new to the fpv game but havnt these guys got some of there facts wrong about the legalities etc of FPV.
Ant
:o "If you stick your head up an elephants a£$%&ss you couldn't come up with so much sh*(***&^%it".
Lol, oh another 1, let em get on with it. Same sh1t, same unfactual crap, they wont listen.
Watch as the thread goes alone, people who do know what they are on about pitch in, then discredit the authors. Then it becomes yet another epic fail lol
Just took a look at that LMA site.
I noticed this comment, early on in the thread ...
The reason there is interference is because the flying model is the source of transmission. If you are flying and one of these planes happens to fly towards where you are, it will swamp the 2.4Ghz channels. One of my local clubs lost 2 planes in the last few weeks due to the one fpv craft - which has now been tracked down.
Not 100% sure, but I think that this is pure supposition ... not to imply that unfounded assertions have no place on the internet ;D
I'm not a true FPVer, but I have dabbled a bit. One of my experiments involved a 2watt Vtx and a Spektrum setup ... on the living-room floor. Try as I might, I could not interrupt the Spektrum link. Now, when I did the same experiment with the 2W Vtx and my 35 Meg gear ... all hell broke loose. I've no idea whether those results accord with the real-life experiences of the FPV' community. Just my "2 Cents"
Did you notice that the contributor, Glenn Masters, injected a bit of sanity into the witch-hunt? He suggested that the likely reason for the crashes was pilot error ... still up there as the Number 1 cause of aircraft' demise.
Then, there was the usual uninformed crap about insurance. More sinister was the implied intent to "appeal to authority" ... that is, to ask the CAA to "do something".
i noticed this reply in the link
Not sure, it is a lttle club near Redcar and our leader went out and got it. It was £70 I think and can be downloaded into a pc to show total spectrum analysis over time.
I'll find out which one it is if you want to know.
We fly next to a housing estate and one of our thoughts is that someoen might be doing this deliberately. :(
cheers, Andy
Andy Boylett
Look at what Andy says, 2.4 everywhere.
We fly next to a housing estate and one of our thoughts is that someoen might be doing this deliberately.
cheers, Andy
http://www.largemodelassociation.com/viewtopic.php?f=6&t=1954 (http://www.largemodelassociation.com/viewtopic.php?f=6&t=1954)
WiFi hot spot.
:opps: posted at the same time.
I'm so bored of this kind of twoddle...
UK pilots need to fly within the regs and reframe from putting up videos if there is any doubt that the flight goes ouside the boundrys in any form.
Its all fuel for the fire at the moment.
I would suggest not using 2.4 either, that way the main bulk of mud slinging is dealt with.
But um, well um, (?) can't think of nothing good to say about this, :( you are always going to get people moaning whatever you do, whether they are uneducated of FPV and don't now what there talking about or not.
Just ;D and leave them to it.
Gordon
I wouldn't use 2.4Ghz anyway - it's swamped with all sorts of broadcasts - not just RC, but WLAN, Cordless Phones, Security Cams etc... We have plenty of legal Frequencies to choose from which arn't swamped... 459/1.3/5.8 that the Old BMFA geriatrics havent discovered yet...
459 and 1.3 are not legal frequencies to transmit video on
Sorry - I didn't put that very well...
I was trying to say there are enough frequencies for Video _and_ Control without having to use 2.4Ghz...
i.e. 459Mhz + 5.8Ghz
Re. 1.3Ghz - are you sure this isn't a Video channel?
I thought I'd check on 1.3Ghz for video - and came across this!
Ofcom UK Frequency Allocation Table 2010 (the latest I could find)
http://stakeholders.ofcom.org.uk/binaries/spectrum/spectrum-policy-area/spectrum-management/ukfat2010.pdf (http://stakeholders.ofcom.org.uk/binaries/spectrum/spectrum-policy-area/spectrum-management/ukfat2010.pdf)
Annex B Table 2 - 10. Model Control
| Code | Frequencies or Frequency Band | Radiated level |
| M.1 | 26960-27280 kHz | 100 mW |
| M.2 | 34·945-35·305 MHz | 100 mW |
| M.3 | 40·66-41·00 MHz | 100 mW |
| M.4 | 433·05–434·79 MHz | 10 mW |
| M.5 | 458·5-459·5 MHz | 100 mW |
This was a surprise to me - 433Mhz can be used for control legally in the UK! Okay - 10mW is a bit small - but it's there in black and white on the Ofcom website!
Annex B Table 2 - 16. Wireless video cameras – Non Broadcasting.
| Code | Frequencies or Frequency Band | Radiated level |
| V.1 | 1389-1399 MHz | 500 mW |
| V.2 | 2400·0–2483·5 MHz | 10 mW |
| V.3 | 5725–5875 MHz | 25 mW |
As you can see from these tables, not only video broadcast on 1.3Ghz legal, but it has the highest output of any video source. The only thing I cant be sure of is the use of 1.3Ghz in the air... I have just spoken with both Ofcom and the CAA and am awaiting their confirmation... :P
Nic.
Yes it is legal to use 1389 - 1399 MHz but you have two problems
First off, Try and find a transmitter on that frequency. Most of the 1.3 MHz tx's available operate from 12xx - 1360. I've not seen any that sit in the uk band.
Second problem would be it's very narrow (10mhz) so if everyone jumped on to 1389, the channel is going to get very swamped making it next to useless.
433-434mhz is an amatuer frequency and there are repeaters dotted around the country that are transmitting all the time. (when they are working.) But I feel sure that a lot of you know this.
Where I fly there are 3 or 4 of these not to far away that I can access if I had a mind to.
Snaggles - 2 very good points.
I managed to find one transmitter in the UK range - but they only do 1.5W or 5W outputs... http://www.rf-links.com/newsite/transmitters/1400.html (http://www.rf-links.com/newsite/transmitters/1400.html). Regarding the narrow bandwidth - I guess no-one is using these frequencies at the moment, and FPV tends not to be a group sport... I agree though - this is not a comercial option.
Flypoppa - Are you saying we could actually use the relay stations to increase our control range on 433?
Swissnic. No. What I am saying that there would be interference. The input frequency of these is 433 + a few KCs. The output is 434 + a few KCs. In most cases they are off untill one transmitts a tone or code. But every 15 minutes they do transmitt a callsign. So if in the area and on their frequency... One FPV lawndart. :o
Ah - I see what you mean... Luckily most of the 433mhz control systems out there are frequency hopping spread spectrum... I am assuming this would get around this callsign transmissions?
Quote from: Swissnic on May 18, 2011, 10:27:43 AM
Ah - I see what you mean... Luckily most of the 433mhz control systems out there are frequency hopping spread spectrum... I am assuming this would get around this callsign transmissions?
Yes it would. As I said they TRANSMITT of 434mhz, only RX on 433. The chances of anyone tranmitting close to you on 433 would be rare.
In my area it is almost dead. Very few players.