Started by planeman, October 07, 2012, 21:19:31 pm
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Quote from: Michael_Rolls on October 08, 2012, 08:31:43 amA few years back there were a number of reported instances in which interference of a Tx by a mobile phone seemed a probability. IIRC all were in the days of 35. Have to admit that after getting a bit twitchy over it at the time and always leaving my phone in the car, nowadays it is always in my pocket at the field.On the question of folk using a phone whilst actually flying - back on here at the time when folk said 'But I have to have my phone available at all times' I responded with'So if it rings will you answer?' one or two said, effectively, yes - how is it different from using the phone whilst driving/ (! ).Mike
Quote from: Michael_Rolls on October 08, 2012, 08:31:43 amhow is it different from using the phone whilst driving
Quote from: markg on October 08, 2012, 10:42:12 am"similar, except probably a thousand times less dangerous"
Quote from: bobt on October 08, 2012, 10:53:19 amunless its you in the path of an out of control model... there are millions of people who still use mobiles while driving (I know its stupid, but you see it all the time) and thankfully, few accidents. I'm not sure about the 'thousand times' bit, Mark....
Quote from: Bad Raven on October 08, 2012, 07:43:57 amRumour? OK, no definitive statement, but if you read your BMFA Handbook.......................Mobile Phones(a) Although mobile telephones operate on frequencies far removed from our model control frequency bands they are a major addition to the increasing background radio 'noise' that our equipment has to filter out. In addition, there is some evidence that there may sometimes be an interaction between mobile 'phones and microprocessor controlled transmitters.(b) Many mobile 'phones transmit powerful signals regularly even when on standby and BMFA recommends that they are not taken into the pits area and especially not on to the flying area. Many 'phones also emit a powerful signal pulse when switching off, which is also something you may have to consider. Your radio equipment has a hard job to do filtering out background RF radiation and you could make it much worse with your mobile 'phone.
Quote from: Jeezeypeeps on October 08, 2012, 11:34:27 amMobile phones transmit powerful signals when "on standby" and a "powerful signal pulse" when switching off? Really First I've heard of it.
Quote from: stukno on October 08, 2012, 18:20:02 pmI am still flying on 35meg so this may not apply to later 2.4 sets, but I had a couple of models going into momentary failsafe earlier this year. The trail to find the cause was both long, expansive and expensive.To cut to the chase, I am satisfied now that the cause was my mobile phone on my belt. I have had my phone on or about me for years but changed to a Blackberry this year. It was then I discovered that 'not all phones are the same'Since keeping the phone well away from me while flying, normal service has been resumed!stu k
Quote from: planeman on October 08, 2012, 19:16:52 pmAny comments?
Quote from: RGN on October 08, 2012, 19:03:21 pmI work in a company that has lots of audio conferences and where many have a BB company phone and their own mobile (usually not a BB).Whenever there is interference on an audio call it is virtually guaranteed that there is a BB near one of the star phones or on a desk near a phone. Moving it away cures the problem. Other mobiles (Android, iPhone and older phones) seem to have no effect at all, or perhaps just the very faintest interference.
Quote from: CF-FZG on October 08, 2012, 18:50:35 pmThey transmit on a regular basis to maintain contact with a cell tower(s), or else how is the system to know which tower to transmit from, (or do you think every tower transmits your incoming calls and hopes it gets one of them right , Also, they transmit when you switch off to let the system know your phone is 'off' and send a busy signal if someone tries to call you.
Quote from: Jeezeypeeps on October 08, 2012, 22:24:06 pmMobile phones transmit all the time.
Quote from: RGN on October 09, 2012, 07:38:33 amThe BMFA have had two safety bulletins in this regard. They seem to indicate that the memories can be erased by mobile phones.See here http://www.bmfa.org/news/bulletins/index.htmlRichard
Quote from: Pup Cam on October 09, 2012, 07:23:34 amPerhaps the Smart phone telemetry concept with the phone stuck to the Tx is not such a good idea!
Quote from: markg on October 08, 2012, 11:07:06 amI'm not advocating using a phone while trying to fly but equally I wouldn't start fearing for my life if I saw someone doing it, just in my own personal risk assessment it doesn't seem deadly dangerous. Basically RC planes just aren't generally all that dangerous. If you were driving along and you just closed your eyes and began randomly poking at all the controls until there was an accident then you would be pretty lucky if nobody got hurt. If you did the same with a plane then you would be pretty unlucky if someone did get hurt.I've seen people fly planes badly for all sorts of reasons, chief among which being a chronic shortage of ability. I've never felt scared or wanted to ask them to stop it, though. (obviously my own risk assessment varies according to model type and location, so if it were someone flying a 1:2 scale Lancaster Bomber at a crowded show then I'd probably be keeping a keen eye on the thing)
Quotebut my comments have been badged "scaremongering" and "negativism" by those who (whilst they hold power in this forum) aren't qualified to judge on matters of engineering science.
Quote from: Bad Raven on October 09, 2012, 09:08:00 amWiz, I'm confused now, how can something that does not transmit or receive be used for telemetry??
Quote from: JohnP on October 09, 2012, 01:05:50 amNo they don't. Obviously when making a call they transmit, but when not calling or texting (or surfing the net on a smartphone etc.) they are not transmitting. Except that every 30 mins or so (time is probably network-dependant) they transmit briefly to update the network with their position and status. Also when switching on or off they transmit briefly to update the network.
Quote from: Jeezeypeeps on October 09, 2012, 09:48:51 amJeeeeeezus - is it national pedants week or something . When I said "all the time" I didn't mean every millisecond of every day. What you have said concurs exactly with how I understood they worked; it just isn't accurately refelcted in the BMFA statement.I'l give up now
Quote from: Jeezeypeeps on October 09, 2012, 09:48:51 am When I said "all the time" I didn't mean every millisecond of every day. What you have said concurs exactly with how I understood they worked; it just isn't accurately refelcted in the BMFA statement.
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