There are certainly some cell antennas shown in the photo (the vertical rectangular boxes).
But most of those are round microwave dishes. This is clearly a major communication hub of some kind.
Both cell antennas and microwave dishes have very little RF radiation immediately below the antenna.
(Or above the antenna, for that matter.) Directing power above or below the antenna is quite wasteful.
The antennas have been designed for horizontal radiation for efficiency and coverage reasons.
The tower is much bigger than would be warranted by a bunch of smallish round microwave dishes.
There must be something higher up that would require a tower of that size.
There also appears to be rather a large bundle of cables and waveguides feeding antennas above the photo.
Is this also a broadcast TV and/or FM transmitting site?
Now that make sense thats tower must be use as end link to FO connection thats why its carry many microwave link. I have no expertise about health issue for this kind of situation.
I just talk from my no science experience I worked with high power transmitter with 1 to 250kw transmitter but nothing so far health issue connected to my work.
btw nice city with a fine beach but no surfing
I just noticed one thing looking at the info which says 34.7 dbW in a screenshot I posted. So 37.4 dbW is converted to Watts:
Pw = 1 * 10 ^(PdbW / 10) = 1 * 10^(34.7/10) = 2951.2 W
That is 3 kilowatts!!! Per sector!
or 64.7 dBm
Is that real? No wonder some people concerned.
One thing's for sure, the house isn't going to be at risk from direct lightning strikes!
On the other hand, I'm not sure about the possible effects of INDIRECT ones... just a thought. I'm guessing here that thunderstorms are fairly common in Sumatra.
That's not real for any cell system I've ever encountered.
That's not real for any cell system I've ever encountered.
Quote from UK-based site (http://www.powerwatch.org.uk/science/faq.asp):
"The area a macrocell is intended to cover is very variable, from at least 500 metres up to a maximum of about 35 km dependent upon capacity and clutter. The powers above need multiplying by the maximum number of active carriers and by the forward gain of the antennas, resulting in EIRPs between about 50 watts (17 dBW) and 1000 watts (30 dBW) per carrier frequency. Base stations typically have 4 carriers, but may have up to 16."
So, I am not sure if Cell Map has listed power at the output of PA or EIRP. But given max 1000 Watts per carrier frequency and given that 3 frequencies used (Usual here in North America 850MHz, 1900MHZ and 2600 MHz) it does in fact match 34.7dbW or ~2.9kW
Here is the map with all towers you can explore yourself:
http://www.ertyu.org/steven_nikkel/cancellsites.html
One thing's for sure, the house isn't going to be at risk from direct lightning strikes!
On the other hand, I'm not sure about the possible effects of INDIRECT ones... just a thought. I'm guessing here that thunderstorms are fairly common in Sumatra.
Hi
If you have ever spent time working on a tower based system .... Lightning strikes (often) ... current flows (lots of it) .... current spike is induced in anything nearby .... magnetic pulse does odd things to stuff nearby. Now hat CRT's are a lot less common, the magnetic part of that may not be quite as big a deal.
That's not real for any cell system I've ever encountered.
Quote from UK-based site (http://www.powerwatch.org.uk/science/faq.asp):
"The area a macrocell is intended to cover is very variable, from at least 500 metres up to a maximum of about 35 km dependent upon capacity and clutter. The powers above need multiplying by the maximum number of active carriers and by the forward gain of the antennas, resulting in EIRPs between about 50 watts (17 dBW) and 1000 watts (30 dBW) per carrier frequency. Base stations typically have 4 carriers, but may have up to 16."
So, I am not sure if Cell Map has listed power at the output of PA or EIRP. But given max 1000 Watts per carrier frequency and given that 3 frequencies used (Usual here in North America 850MHz, 1900MHZ and 2600 MHz) it does in fact match 34.7dbW or ~2.9kW
Here is the map with all towers you can explore yourself:
http://www.ertyu.org/steven_nikkel/cancellsites.html
I just noticed one thing looking at the info which says 34.7 dbW in a screenshot I posted. So 37.4 dbW is converted to Watts:
Pw = 1 * 10 ^(PdbW / 10) = 1 * 10^(34.7/10) = 2951.2 W
That is 3 kilowatts!!! Per sector!
or 64.7 dBm
Is that real? No wonder some people concerned.
I just noticed one thing looking at the info which says 34.7 dbW in a screenshot I posted. So 37.4 dbW is converted to Watts:
Pw = 1 * 10 ^(PdbW / 10) = 1 * 10^(34.7/10) = 2951.2 W
That is 3 kilowatts!!! Per sector!
or 64.7 dBm
Is that real? No wonder some people concerned.
I know that the backup batteries they put in these things for power outages wouldn't support 3Kw for more than a few seconds, so there is something fishy in the numbers.
I just noticed one thing looking at the info which says 34.7 dbW in a screenshot I posted. So 37.4 dbW is converted to Watts:
Pw = 1 * 10 ^(PdbW / 10) = 1 * 10^(34.7/10) = 2951.2 W
That is 3 kilowatts!!! Per sector!
or 64.7 dBm
Is that real? No wonder some people concerned.
I know that the backup batteries they put in these things for power outages wouldn't support 3Kw for more than a few seconds, so there is something fishy in the numbers.