> has anyone done any study on Amateur Radio Operators and their families?
There have been many such studies done. No correlations have been found.
Likewise there have been many studies on people living near high power Broadcast and TV transmitters. Originally these transmitters were build way out in the country but as suburbia spread, thousands of houses were built close to the transmitting masts.
This uncontrolled development was initially a big concern with the authorities, but needless to say, no correlations with health were ever found.
>... the British regulator says that objections to powerline all come from radio amateurs
The truth is that BPL interferes with ALL radio systems, however the Radio Amateurs are the only qualified observers who are bothering to express their concerns at this time. The Commercial and Official bodies will finally start to panic when the interference becomes disastrous.
Blaming in Hams merely proves that you are biased or lying.
> Phones are "full duplex" because there are 2 wires involved. One wire coming in to the receiver and going up to the earpiece, and one wire going out from the mouthpiece. (Yes, telco engineers, I know it's not quite that simple, but for purposes of this conversation, it is)
Utter screaming gibberish.
The phone IS actually full duplex. The Receive and Transmit signals travel on the same wires at the same time (in opposite directions), thanks to a gadget called a Hybrid.
And believe it or not, the same thing can be done on wireless. Single Frequency Duplex radios were demonstrated decades ago.
As a Pilot and an RF/EMC engineer, I am certain that if a planes fuel guages started acting up as described, I would land immediately. And very carefully.
There has to be something seriously wrong with the plane.
The GPS phone interferes with a speaker (with built in amplifier) because the speaker is appallingly badly designed and tested. It is cheap plastic rubbish.
Aircraft electronics however is designed with a "money is no object" approach. If a small phone could interfere, the planes own high-power Radar, HF, VHF and other Transponders would cause absolute chaos.
Stop and think for a moment. How does the sensitive receiver in your phone manage to work if the phone can interfere with "everything".
It is illegal for Government Officers (in Oz and probably elsewhere) to use a Government Data Base for anything outside their authorisation. Like searching for a friends address.
Yes BPL affects Hams, but more importantly it also wipes out Ambulance, Fire, Marine, Aircraft, Miltary, SW Broadcasting and any other essential service which uses ShortWave for emergency communications.
Whenever you read an idiot moaning about ham interference, you know you are reading a troll or someone trying to spin the issue. Hams are largely protected by notching, but there are many other vitally important services which are at risk.
There are other issues as well. The Power Lines are very, very noisy. BPL cannot work because of the inherent interference. Power Lines are also poorly balanced and shielded. Not only do they radiate, but BPL suffers catastrophically from interference coming from outside. Like SW broadcasting.
Even if BPL did work, it would be capable of only low overall speed which in turn must be shared between multiple users.
BPL is an appalling scam which is regularly dragged out and then quickly abandoned when the trials inevitably fail.
Slashdot Mirror
> has anyone done any study on Amateur Radio Operators and their families?
There have been many such studies done. No correlations have been found.
Likewise there have been many studies on people living near high power Broadcast and TV transmitters.
Originally these transmitters were build way out in the country but as suburbia spread, thousands of houses were built close to the transmitting masts.
This uncontrolled development was initially a big concern with the authorities, but needless to say, no correlations with health were ever found.
Paid Posing ?
Was supposed to be "Paid Posting", but I think I like Paid Posing better...
Notice all the negative comments? Rather a lot even for Slash Dot.
This event must have the "powers that be" worried.
Do a Google search on Paid Posing. Rather scary.
LED's are frequently used as photo-detectors. They aren't wildly efficient, but they do work.
www.parallax.com/Portals/0/.../LEDLightEmitterandDetector7-31-07.pdf
It makes the optics so much simpler if you can use just one device for TX and RX.
> As a physicist that studies medical ultrasound, there actually ARE radio waves emitted by a ultrasound scanner
Most any electronic device emits some level of RF, but an ultrasound scanner doesn't use RF to scan the body.
Holy misinformation indeed.......
Very similar to the "Educ-8" TTL computer from Electronics Australia mag in 1974
see http://en.wikipedia.org/wiki/File:EDUC-8_Microcomputer.jpg
and http://www.sworld.com.au/steven/educ-8/
Wasting my breath I know, but...
> ... the British regulator says that objections to powerline all come from radio amateurs
The truth is that BPL interferes with ALL radio systems, however the Radio Amateurs are the only qualified observers who are bothering to express their concerns at this time. The Commercial and Official bodies will finally start to panic when the interference becomes disastrous.
Blaming in Hams merely proves that you are biased or lying.
> Did you miss the part where I said it was simplified?
Simplified and hopelessly wrong.
You said there were two wires to the handset. There actually are four.
There are only two wires in the line circuit because copper wire directly supports full duplex.
So what exactly has your babble achieved?
Wasting my breath I know, but....
Single Frequency Duplex radios were demonstrated decades ago.
It's just a matter of using an adaptive equaliser to exactly cancel the Transmit signal at the Receiver.
> Phones are "full duplex" because there are 2 wires involved. One wire coming in to the receiver and going up to the earpiece, and one wire going out from the mouthpiece. (Yes, telco engineers, I know it's not quite that simple, but for purposes of this conversation, it is)
Utter screaming gibberish.
The phone IS actually full duplex. The Receive and Transmit signals travel on the same wires at the same time (in opposite directions), thanks to a gadget called a Hybrid.
And believe it or not, the same thing can be done on wireless. Single Frequency Duplex radios were demonstrated decades ago.
"it had designed a little radio telescope"
Utter crap.
It used capacitive coupling, rather than a direct connection.
You and your friends must get excited easily.
A Wireless peer to peer messaging system. What a great idea!
You have just invented Ham Radio. About a 100 years too late.
Can I have a simple text based version please?
I frequently search for Engineering data sheets.
In the past, Google would give you the wanted pdf in the first few hits.
Now you get pages and pages of spam sites who don't actually have the file you want.
I'm desperately hoping for a Google replacement. Blekko comes close, but not yet.
As a Pilot and an RF/EMC engineer, I am certain that if a planes fuel guages started acting up as described, I would land immediately. And very carefully.
There has to be something seriously wrong with the plane.
I just can't believe this story.
The GPS phone interferes with a speaker (with built in amplifier) because the speaker is appallingly badly designed and tested. It is cheap plastic rubbish.
Aircraft electronics however is designed with a "money is no object" approach. If a small phone could interfere, the planes own high-power Radar, HF, VHF and other Transponders would cause absolute chaos.
Stop and think for a moment. How does the sensitive receiver in your phone manage to work if the phone can interfere with "everything".
Utter Rubbish.
I'm an RF/EMC Engineer, and if a planes electronics was this badly designed and tested, then they simply shouldn't be flying.
The idea that an aircraft fuel gauge could be affected by a motor in a CD player is utterly ludicrous.
BTW, hobbyists who listen to radio (as distinct from Transmitting) are traditionally known as SWL's (Short Wave Listeners).
You don't need a Ham License to listen.
> "..an arguably unconventional hobby given the technology of 2011"
Oh go away you silly person.
At my local newsagent the computer magazines are dwindling fast, while the electronics/radio mags are making a strong comeback.
Computers are just a commodity and excessively boring. Nerds are looking elsewhere.
Suddenly ham radio is cool again. Even morse is retro-cool.
This situation is quite common.
It is illegal for Government Officers (in Oz and probably elsewhere) to use a Government Data Base for anything outside their authorisation. Like searching for a friends address.
The logs are kept and frequently analysed.
Tesla was a Loony-Tune. After 100 years his wacky ideas are till considered wacky. Broadcast power anyone?
> with no interference and no problems would SEEM TO SUGGEST you have no clue about what you are speaking.
On the other hand, you have just proven that you have no clue about what you are speaking.
The interference to HF services by BPL is well documented.
HF services = Ambulance, Marine Rescue, Police, Fire, Aircraft, Military, Shortwave Broadcasting, Amateur Radio, and many others.
> So move all of those services to 3G cell-based systems..
And how exactly will I use 3G in the middle of the ocean?
idiot
Yes BPL affects Hams, but more importantly it also wipes out Ambulance, Fire, Marine, Aircraft, Miltary, SW Broadcasting and any other essential service which uses ShortWave for emergency communications.
Whenever you read an idiot moaning about ham interference, you know you are reading a troll or someone trying to spin the issue. Hams are largely protected by notching, but there are many other vitally important services which are at risk.
There are other issues as well. The Power Lines are very, very noisy. BPL cannot work because of the inherent interference. Power Lines are also poorly balanced and shielded. Not only do they radiate, but BPL suffers catastrophically from interference coming from outside. Like SW broadcasting.
Even if BPL did work, it would be capable of only low overall speed which in turn must be shared between multiple users.
BPL is an appalling scam which is regularly dragged out and then quickly abandoned when the trials inevitably fail.
I'm wasting my breath of course, but the good old Iambic Morse Paddle does all of this and is simple and easy to learn. Faster too.
(the dual paddle "squeeze key", not the old style morse key)