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UER Forum > Archived Rookie Forum > Question about radio transmitters (Viewed 709 times)
Steed 


Location: Edmonton/Seoul
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Question about radio transmitters
< on 10/30/2013 7:53 PM >
Posted on Forum: UER Forum
 
I've got an opportunity to climb a radio transmitter on top of a radio station under construction. The thing has been switched off and a couple friends have made it up there, but at some point the thing's going to become active again and I know it will fry anyone who gets close.

Any advice on how to tell if it's transmitting? Will it be warm from a safe distance, or humming, or will there be warning lights, or will I hear Christian preachers in my fillings? Looking to not get fried alive.

This is the structure in question, courtesy of lshlsh:


GLP. 


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Re: Question about radio transmitters
<Reply # 1 on 10/30/2013 8:39 PM >
Posted on Forum: UER Forum
 
Possibly pick up an RF meter? They can get kinda pricey though.
https://www.google...ter&sqi=2&bav=on.2,or.r_qf.&bvm=bv.55617003,d.aWc,pv.xjs.s.en_US.2UGjtckCHYg.O&biw=1280&bih=637&tch=1&ech=1&psi=wW1xUq7 LAYaOyAG51IGgDg.1383165377882.5&sa=X&ei=AW5xUoiyLM_eyQHqtYCoCA&ved=0CH0Q8wIwAA

We are professionals pretending to be amateurs.
SDR69 


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Re: Question about radio transmitters
<Reply # 2 on 10/30/2013 11:28 PM >
Posted on Forum: UER Forum
 
Personal RF monitor is the way to go but is very pricey. You can also rent one for $100/month here...


http://www.us-inst...sp?product_id=3517


If it becomes energized while you are on it, you're still fucked, unless you can get away quick. Chances are you can't. Good luck.

“In wisdom gathered over time I have found that every experience is a form of exploration.” Ansel Adams
SDR69 


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Re: Question about radio transmitters
<Reply # 3 on 10/30/2013 11:35 PM >
Posted on Forum: UER Forum
 
Imi shimi peck pogi da. I think that is "good luck" in Korean.

“In wisdom gathered over time I have found that every experience is a form of exploration.” Ansel Adams
Steed 


Location: Edmonton/Seoul
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Re: Question about radio transmitters
<Reply # 4 on 10/31/2013 3:15 AM >
Posted on Forum: UER Forum
 
Posted by SDR88
Imi shimi peck pogi da. I think that is "good luck" in Korean.


I think I'd have to see that written out in Korean, but it doesn't look familiar.

Anyway, we're going there tonight, and I'm not renting expensive equipment for such a small thing. We're going to just hopefully strike before it goes online.

SDR69 


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Re: Question about radio transmitters
<Reply # 5 on 10/31/2013 5:56 AM >
Posted on Forum: UER Forum
 
Yo Steed, that was supposed to be a joke. Thought you would understand (and you probably did but took it the wrong way, oops!) Anyway, best of luck man. If you can lay your hands on an inductive amplifier that would be better than nothing. I really don't want to hear about you getting fried!!! Stay as safe as you can (IMHO not worth it but do what you will).

“In wisdom gathered over time I have found that every experience is a form of exploration.” Ansel Adams
Steed 


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Re: Question about radio transmitters
<Reply # 6 on 11/2/2013 12:50 AM >
Posted on Forum: UER Forum
 
Posted by SDR88
Yo Steed, that was supposed to be a joke. Thought you would understand (and you probably did but took it the wrong way, oops!)


Nope, none of the words made any sense to me.

Anyway, we went up last night, and when confronted with the thing, we both decided we weren't going to risk our lives for a couple pictures, no matter how likely it was the tower wasn't transmitting. The building itself is still empty an in late construction stages. The tower is hooked up to power but for lighting those airplane beacons. We climbed to the first platform below the transmitter and I found a cord that was unconnected.

Screef 


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Re: Question about radio transmitters
<Reply # 7 on 11/3/2013 10:51 AM >
Posted on Forum: UER Forum
 
Take the street address and do a database search of the governing body for radio spectrum.
As a radio station there will be a list of transmitters in that location with frequencies.

Purchase a small radio and tune it to the frequency of the radio station. If you can hear the radio station without the antenna. I wouldn't climb it.

Carry a CFL light bulb. It will light up with then is a lot of RF. (More then 5 watts). If it lights up GTFO quick. Sources: I repair radios for a living.

“If you don’t start showing some peace, love, and unity, I’ll break your faces.” - Dj Bones
Steed 


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Re: Question about radio transmitters
<Reply # 8 on 11/3/2013 11:18 AM >
Posted on Forum: UER Forum
 
Thanks. Keep in mind I'm in Korea and we don't have the same public access to things like radio stations you guys do. I checked their website and they are currently based in another place south of the river, presumably broadcasting on the same frequency. The light bulb thing sounds like the best idea.

Since you seem to know, how close can one get before the effects become dangerous, hypothetically? How long until you feel the effects?

Screef 


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Re: Question about radio transmitters
<Reply # 9 on 11/3/2013 9:59 PM >
Posted on Forum: UER Forum
 
Posted by Steed
Thanks. Keep in mind I'm in Korea and we don't have the same public access to things like radio stations you guys do. I checked their website and they are currently based in another place south of the river, presumably broadcasting on the same frequency. The light bulb thing sounds like the best idea.

Since you seem to know, how close can one get before the effects become dangerous, hypothetically? How long until you feel the effects?


It can become dangerous before you feel it.

Are they broadcasting on AM or FM?
AM commercial radio broadcasting can hurt you quickly.
http://www.youtube...v=lMuJKsUjD_o#t=89
That guy gets burned with rubber gloves on, just by touching weeds to an AM tower.
AM towers THEMSELVES are loaded up with RF. They are the antennas. If it's AM, don't bother.
Respect ALL "Danger high voltage" signs near an AM transmitter.
AM towers usually put out over 1000 watts.

FM typically operates around 90mhz or so. It is line of site transmission so the output power is usually lower (Less then a 1000 watts). Being directly below or above it is usually safe (on a tower).
However, there are many different kinds of antennas with different propagation patterns. Some examples of this: http://www.shively...nav-fmantennas.php
If you touch an FM source, you will get a burn.
Being around strong FM waves isn't good for you either. Try and limit your exposure. At that frequencies soft tissues like the eyes will get burned quicker then skin.


You'll probably do this anyways, so make sure it's a CFL light bulb. Bring it close to any point you are going to move to.

Oh and RF burns suck. It's the flesh being cooked in an instant. It will heal over time. 5 watts ouch, hot damn. 50 watts F*CK F*CK F*CK. 1000watts you might will probably loose that appendage.
5-50 watts will light up a CFL, if it lights up. Back off.


Other thoughts:
If they are transmitting from the other side of the river, and that building is there base station. The base will probably have a microwave link to control the transmitter. It's typically highly directional. I wouldn't be too worried about it as long as you stay behind and/or below it (not to the sides or in front).

[last edit 11/3/2013 10:02 PM by Screef - edited 2 times]

“If you don’t start showing some peace, love, and unity, I’ll break your faces.” - Dj Bones
Steed 


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Re: Question about radio transmitters
<Reply # 10 on 11/3/2013 11:23 PM >
Posted on Forum: UER Forum
 
Yeah, we felt safe-ish being below it. It's all just a question of when this thing goes online, but there was absolutely no sign saying whether it was so. I'm not ready to risk my life for this, so thanks for your information.

Screef 


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Re: Question about radio transmitters
<Reply # 11 on 11/4/2013 3:25 AM >
Posted on Forum: UER Forum
 
Posted by Steed
Yeah, we felt safe-ish being below it. It's all just a question of when this thing goes online, but there was absolutely no sign saying whether it was so. I'm not ready to risk my life for this, so thanks for your information.

I would work out if it was AM or FM first. Call them up or something.

Oh and that's one thing to look into, a radio station might shut down for a bit during the night.

“If you don’t start showing some peace, love, and unity, I’ll break your faces.” - Dj Bones
Steed 


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Re: Question about radio transmitters
<Reply # 12 on 11/4/2013 5:12 AM >
Posted on Forum: UER Forum
 
Posted by Screef

Oh and that's one thing to look into, a radio station might shut down for a bit during the night.


Hmm, that's a strong possibility.

I'm still not sure what to make of it, as the building is pretty well empty with no equipment yet, and with light security in the lobby. Although they did have an opening ceremony last month with the former president of Korea in attendance, so despite appearances something has been opened. However, when the risk is having your face melt off, it's harder to take that risk.

SuchundFind 


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Re: Question about radio transmitters
<Reply # 13 on 11/14/2013 8:59 PM >
Posted on Forum: UER Forum
 
You could use a frequency counter that will show you if there are any frequencies nearby.
It doesn't show you the normal ones that are around us, it only works in close proximity to a strong sources.

So if it shows some frequency you will know that it comes from this tower or another transmitter nearby.

Some show you how strong it is, and as it shows the frequency.

They sell them for 50 bucks instead of 300 of a RF meter.

entropy 


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Re: Question about radio transmitters
<Reply # 14 on 11/15/2013 11:17 PM >
Posted on Forum: UER Forum
 
Out off topic, the antenna is really nice !


I do love old transmitter site and this kind of structure is unusual.

For me it looks like a old shortwave transmitter (so AM). From what I know, Fm and TV antenna are verticaly polarized so to me it can't be that. But anyway the design is new to me

Keep posting pictures of it !



Steed 


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Re: Question about radio transmitters
<Reply # 15 on 11/27/2013 7:33 AM >
Posted on Forum: UER Forum
 
Last time I went by it, it was brightly lit up and I suspect it is in active use now, so no more going back.

Here are a couple of my pictures of it.





Vectored Approach 


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Re: Question about radio transmitters
<Reply # 16 on 11/27/2013 5:40 PM >
Posted on Forum: UER Forum
 
The lights on the top are for aircraft avoidance. Does not specify whether it is transmitting or not. There is no good way to know for certain though, so better safe than toast.

Honesty may be the best policy, but it's important to remember that apparently, by elimination, dishonesty is the second-best policy. -George Carlin (1937 - 2008)
Steed 


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Re: Question about radio transmitters
<Reply # 17 on 11/27/2013 6:12 PM >
Posted on Forum: UER Forum
 
Posted by Vectored Approach
The lights on the top are for aircraft avoidance. Does not specify whether it is transmitting or not. There is no good way to know for certain though, so better safe than toast.


No, not those lights. Since these pictures were taken, I passed by the building and the tower was lit up by many floodlights from below. The change in lighting, as well as more of the building being inhabited, convinced me it's past the safe window for going up there.

Steed 


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Re: Question about radio transmitters
<Reply # 18 on 2/13/2014 1:40 AM >
Posted on Forum: UER Forum
 
This picture was taken by some friends of mine who went earlier than I did. One of them was so drunk he passed out up top. The red light is coming from a beacon for airplanes.



Abby Normal 


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Re: Question about radio transmitters
<Reply # 19 on 2/13/2014 4:54 AM >
Posted on Forum: UER Forum
 
Posted by Steed
This picture was taken by some friends of mine who went earlier than I did. One of them was so drunk he passed out up top. The red light is coming from a beacon for airplanes.

https://fbcdn-spho...6_1417394302_n.jpg


What could possibly go wrong with that scenario?

Abby

"Government is not a solution to our problem, government is the problem." Ronald Reagan
UER Forum > Archived Rookie Forum > Question about radio transmitters (Viewed 709 times)
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