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UER Forum > Archived Rookie Forum > Radio Frequency Emissions (Viewed 1810 times)
Yield 


Location: Look behind you
Gender: Male


I'd do you for a klondike bar

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Re: Radio Frequency Emissions
<Reply # 20 on 4/30/2011 12:50 PM >
Posted on Forum: UER Forum
 
Okay so I glanced through the tutorials board (http://www.uer.ca/...tid=120&currpage=1) and found nothing on how to tell what towers are safe and what towers aren't. I'm going to take the opportunity right now to ask the people with the most knowledge on the subject to make a basic guide. Anybody up for it?

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etchleon 


Location: toronto today...
Gender: Male


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Re: Radio Frequency Emissions
<Reply # 21 on 4/30/2011 6:53 PM >
Posted on Forum: UER Forum
 
Typically, most towers are not really safe unless the Transmitter is off. However, ones with highly directional antenna's can be approached more easily by staying out of the antenna's emission direction. This mainly applies to parabolic antenna's approached from the rear, as Yagi's have side and back lobes that at high RX power can still be very nasty. Active AM towers are a NO, as they carry very high voltages. A point regarding parabolic antenna's is they tend to be high freq and very high gain, making getting in front and up close very hazardous. SOME cell phone towers are reasonably safe, as cell phone technology, by its nature, calls for low emitted power. (in order to allow the cells to small and thus avoid overloading the spectrum, they are low power with a small service area that hand off your call from tower to tower as you move)

But in truth, you should generally avoid climbing any RF tower unless you know and understand its operating parameters and have been trained both in general RF safety and briefed/researched the tower in question.

Old RADAR towers from the cold war that are not shut down are safe option (RFwise..you still need to know how to climb safely) Another option for climbing up into the sky on a rickety steel structure is to climb cranes, which lack the RF and electrical hazards.

\/adder 


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Re: Radio Frequency Emissions
<Reply # 22 on 6/2/2011 7:06 AM >
Posted on Forum: UER Forum
 
In recent news: RF has been labeled carcinogenic by the World Health Organization.

I don't care I'll lick a transmitter next time I climb.

http://www.cnn.com...1/who.cell.phones/

WHO: Cell phone use can increase possible cancer risk
By Danielle Dellorto, CNN

Radiation from cell phones can possibly cause cancer, according to the World Health Organization. The agency now lists mobile phone use in the same "carcinogenic hazard" category as lead, engine exhaust and chloroform.

Before its announcement Tuesday, WHO had assured consumers that no adverse health effects had been established.

A team of 31 scientists from 14 countries, including the United States, made the decision after reviewing peer-reviewed studies on cell phone safety. The team found enough evidence to categorize personal exposure as "possibly carcinogenic to humans."

What that means is they found some evidence of increase in glioma and acoustic neuroma brain cancer for mobile phone users, but have not been able to draw conclusions for other types of cancers

"The biggest problem we have is that we know most environmental factors take several decades of exposure before we really see the consequences," said Dr. Keith Black, chairman of neurology at Cedars-Sinai Medical Center in Los Angeles.
Is your cell phone safe?
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The type of radiation coming out of a cell phone is called non-ionizing. It is not like an X-ray, but more like a very low-powered microwave oven.

"What microwave radiation does in most simplistic terms is similar to what happens to food in microwaves, essentially cooking the brain," Black said. "So in addition to leading to a development of cancer and tumors, there could be a whole host of other effects like cognitive memory function, since the memory temporal lobes are where we hold our cell phones."

Wireless industry responded to Tuesday's announcement saying it "does not mean cell phones cause cancer." CTIA-The Wireless Association added that WHO researchers "did not conduct any new research, but rather reviewed published studies."

The European Environmental Agency has pushed for more studies, saying cell phones could be as big a public health risk as smoking, asbestos and leaded gasoline. The head of a prominent cancer-research institute at the University of Pittsburgh sent a memo to all employees urging them to limit cell phone use because of a possible risk of cancer.

"When you look at cancer development -- particularly brain cancer -- it takes a long time to develop. I think it is a good idea to give the public some sort of warning that long-term exposure to radiation from your cell phone could possibly cause cancer," said Dr. Henry Lai, research professor in bioengineering at University of Washington who has studied radiation for more than 30 years.

Results from the largest international study on cell phones and cancer was released in 2010. It showed participants in the study who used a cell phone for 10 years or more had doubled the rate of brain glioma, a type of tumor. To date, there have been no long-term studies on the effects of cell phone usage among children.

"Children's skulls and scalps are thinner. So the radiation can penetrate deeper into the brain of children and young adults. Their cells are at a dividing faster rate, so the impact of radiation can be much larger." said Black of Cedars-Sinai Medical Center.

In February, a study by researchers at the National Institutes of Health, revealed radiation emitted after just 50 minutes on a mobile phone increases the activity in brain cells. The effects of brain activity being artificially stimulated are still unknown.

Neurosurgeon and CNN chief medical correspondent Dr. Sanjay Gupta says Tuesday's announcement, "dealt a blow to those who have long said, 'There is no possible mechanism for cell phones to cause cancer.' By classifying cell phones as a possible carcinogen, they also seem to be tacitly admitting a mechanism could exist."

Manufacturers of many popular cell phones already warn consumers to keep their device away from their body and medical experts say there other ways to minimize cell phone radiation.

The Apple iPhone 4 safety manual says users' radiation exposure should not exceed FCC guidelines: "When using iPhone near your body for voice calls or for wireless data transmission over a cellular network, keep iPhone at least 15 millimeters (5/8 inch) away from the body."

BlackBerry Bold advises users to "keep the BlackBerry device at least 0.98 inch (25 millimeters) from your body when the BlackBerry device is transmitting."

The logic behind such recommendations is that the further the phone is from the body, the less radiation is absorbed. Users can also use the speakerphone function or a wired earpiece to gain some distance.

Users can text instead of talk if they want to keep the phone away from their faces.

Finally, cell phones emit the most radiation when they are attempting to connect to cellular towers. A moving phone, or a phone in an area with a weak signal, has to work harder, giving of more radiation. So users can avoid using their cell phones in elevators, buildings and rural areas if they want to reduce their exposure, experts say.


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Eschaton 


Location: Louisville, KY
Gender: Male


Entry: Eschaton (es-kuh-tawn) noun | end of time, climax of history | Etymology: Greek for 'last'

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Re: Radio Frequency Emissions
<Reply # 23 on 6/25/2011 6:53 PM >
Posted on Forum: UER Forum
 
There's a lot of good info in this thread, so I thought I'd come here to take advantage of some of your knowledge.
Here's an antenna that I'm thinking about climbing. I'll be able to get some skyline shots that no one else has gotten before if I do. Can anyone identify the kind of antenna it is, and if it's safe to climb or not?




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tholcomb 


Location: Chattanooga, TN
Gender: Male


Captain Baghead!

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Re: Radio Frequency Emissions
<Reply # 24 on 6/25/2011 7:56 PM >
Posted on Forum: UER Forum
 
Posted by TheVicariousVadder
In recent news: RF has been labeled carcinogenic by the World Health Organization.

I don't care I'll lick a transmitter next time I climb.

http://www.cnn.com...1/who.cell.phones/



I'd take that with a grain of salt.
RF Waves are too big to penetrate human cells and cause mutations. UV Rays and X-Rays can and will cause cancer. RF Waves will just cook you. The WHO is wrong, physics is right.

geoff5093 


Location: New Hampshire
Gender: Male




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Re: Radio Frequency Emissions
<Reply # 25 on 7/3/2011 4:36 AM >
Posted on Forum: UER Forum
 
Posted by etchleon
ah, EMINT. I'd stay a good distance away. I got a nasty burn from a mere 200W 800mhz antenna, Id hate to see what 150kw does...

Depends on the frequency of the transmitter, frequencies in the GHz range are much more dangerous then those in the lower bands.


mesomewierdo 






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Re: Radio Frequency Emissions
<Reply # 26 on 7/10/2011 5:17 PM >
Posted on Forum: UER Forum
 
Posted by Lambda
I'm not too sure how valid this is, but I have read that when climbing radio towers, you should wear a flashbulb on your neck. If it flashes, then the field is strong enough to damage you. This sounds a little flaky to me, and I'm not about to go test it.
Your best bet is probably to avoid getting too close to the antennae themselves.


I think the idea is to use a flourescent bulb.

It's pretty helter skelter. If it's glowing, GTFO.

The locals in Cutler, ME, had flickery (not glowing unpowered) flourescent bulbs and humming bedframes when the submarine longwave transmitter was running.

JC 


Location: Augusta Georgia
Gender: Male


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Re: Radio Frequency Emissions
<Reply # 27 on 7/11/2011 12:22 PM >
Posted on Forum: UER Forum
 
50 Watts on my FT-8900 in my truck will make a fluorescent bulb light up quite nicely.


Will try to take a pic.

~JC


Keying up at KJ4ZNR

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UER Forum > Archived Rookie Forum > Radio Frequency Emissions (Viewed 1810 times)
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