Celestian EMF Surveying, Newcastle Emlyn (2026)

Emission safety levels of power lines, transformers and mains wiring for home buyers, ES folks. Property surveys carried out within a 120 miles radius of Cardigan, bookings taken 7 days a week to suit you. Various survey packages available and comprehensive reliable data-driven reports are provided on survey completion. I use top of the range industry-grade surveying equipment and cover an entire frequency range to 20Ghz as well as highly sensitive electrical field measurements.

07/12/2021

EMF exposure safety guidelines as set by medical experts

https://www.celestian.net/post/emf-safety-limits-set-by-the-experts

10/08/2021

*DOMESTIC ELECTROMAGNETIC RADIATION EXPOSURE *

Here it is folks, - the latest EMR study on health risks related to radio frequency devices in the home and a full evaluation of what it means to the user with a comparison to safety guidelines.

As always, this test was carried out in a controlled environment using top of the range industry and military grade measurement equipment by Anritsu and Aaronia costing in excess of £30,000 and fully calibrated for the most accurate results possible.

The indoor tests were carried out in a typical size living room (5x7m) of double cavity wall construction. The devices were placed 5.5 meters from the transmitting router with one plasterboard wall between and not other furniture obstructions in the immediate vicinity. The tests were carried out with a Log periodic directional antenna pointed directly at the device at various distances. The house located in a small valley with no other phone users present at the time.

The smartphone used was an HTC U11 (2018 model) and the laptop was a Dell Alienware R4. The router was a standard Talktalk home wifi router (2.4Ghz).

And on to the emissions results from the tests:

0.3m Laptop wifi upload avg mV/m: 486 | Max mV/m: 649
1.0m Laptop wifi upload avg mV/m: 186 | Max mV/m: 235
2.0m Laptop wifi upload avg mV/m: 122 | Max mV/m: 162
0.3m Laptop wifi download avg mV/m: 503 | Max mV/m: 730
1.0m Laptop wifi download avg mV/m: 195 | Max mV/m: 324
2.0m Laptop wifi download avg mV/m: 170 | Max mV/m: 203

0.3m Smartphone wifi upload avg mV/m: 365 | Max mV/m: 567
1.0m Smartphone wifi upload avg mV/m: 154 | Max mV/m: 223
2.0m Smartphone wifi upload avg mV/m: 73 | Max mV/m: 97
0.3m Smartphone wifi Download avg mV/m: 681 | Max mV/m: 1062
1.0m Smartphone wifi Download avg mV/m: 243 | Max mV/m: 430
2.0m Smartphone wifi Download avg mV/m: 113 | Max mV/m: 186

0.5m Wifi router Tx avg mV/m: 932 | Max mV/m: 1281
1.0m Wifi router Tx avg mV/m: 778 | Max mV/m: 1046
2.0m Wifi router Tx avg mV/m: 365 | Max mV/m: 454
3.0m Wifi router Tx avg mV/m: 203 | Max mV/m: 251

0.3m Smartphone LTE data up avg mV/m: 5780 | Max mV/m: 7900
1.0m Smartphone LTE data up avg mV/m: 1413 | Max mV/m: 2030
2.0m Smartphone LTE data up avg mV/m: 1220 | Max mV/m: 1503
3.0m Smartphone LTE data up avg mV/m: 437 | Max mV/m: 873

0.3m Smartphone LTE data down avg mV/m: 5511 | Max mV/m: 6483
1.0m Smartphone LTE data down avg mV/m: 389 | Max mV/m: 3015
2.0m Smartphone LTE data down avg mV/m: 143 | Max mV/m: 1394
3.0m Smartphone LTE data downl avg mV/m: 52 | Max mV/m: 823

0.3m Smartphone phonecall avg mV/m: 177 | Max mV/m: 280
1.0m Smartphone phonecall avg mV/m: 50 | Max mV/m: 177
2.0m Smartphone phonecall avg mV/m: 28 | Max mV/m: 85
3.0m Smartphone phonecall avg mV/m: 25 | Max mV/m: 50
0.5m Smartphone call init Pk avg mV/m: n/a | Max mV/m: 849
0.5m Smartphone call exit Pk avg mV/m: n/a | Max mV/m: 922

Notes from the above tests... the smartphone data and phone call tests were carried out in the yard approx 7 meters from a building on one side and trees and a hill on the other side. The nearest mast was 250 meters away and without line of sight. The measuring equipment was pointing away from it.

The smartphone download tests are underestimated figures as the test should have been evaluated with an omni antenna to capture EMR from the mast as well. So it is likely that a further 10 to 20% needs to be added to the values to account for this.

The values measured from the wifi router were with a single device connected at just 20mbits speed. These values would be significantly higher with more devices and/or full 54 or 300 mbits speed. (By a factor of at least 2x).

These tests (particularly the wifi parts) do not account for overall summed radiation exposure accounting for whole bandwidth or any MIMO characteristics of the wifi router, which would generally make total radiation exposure somewhat higher than shown here. Particularly as 3G and 4G LTE have 4 times narrower bandwidth than Wifi.

CONCLUSIONS:

1. Laptop download and upload make little difference to overall exposure.
2. Keeping almost a meter from the laptop (use an ext keyboard) will reduce exposure significantly by 250%.
3. Smarphone data use (watching a 2K youtube video) at 30cm distance irradiates the brain with nearly 3 times more EM radiation than at 1 meter from the phone. Better to watch videos etc on a larger phone or tablet and keep it at least arms length from you.
4. Sitting within 1.5 meters of an active Wifi router is an even higher health risk than near laptop or mobile Wifi as it is constantly transmitting and at higher powers. Keep the wifi router the other side of the room.
5. A simple voice call (with data not switched on in the background) will output a comparitively low dose of radiation owing to modern Volte technology, meaning voice calls (especially on hands free) are the very lowest of all the device dosage scenarios tested here. But a poweful pulse is emitted on initiating and exiting a phone call, so keep the phone at arms length when these take place.
6. The worst possible scenario is using constant 3G or 4G data connection in a low or medium signal area (such as watching social media videos) which at 30cm irradiates the human head with over 6500 mV/m EMR peaks every few seconds. This is over and above most safety levels in many European and Asian countries. The phone ideally needs to be used 2 meters or more away to be anywhere near recommended safety levels.

As usual, here is a list of safety levels set by various countries, European commitees, scientific consensus and independent safety organisations on EMF (all values in average millivolts per meter mV/m):

60 day / 9 night (Salzburg committee)
40 day / 30 night (Bio Initiative)
60 day / 20 night (IGNIR report)
200 day / 62 night (EuropaEM report)
613 day / 200 night (EU parliament 2001 report)
800 day / 253 night (Seletun scientific consensus)
1900 day / 1900 night (Austrian govt)
1900 day / 1900 night (Austrian govt)
3000 day / 3000 night (Brussels govt)
4000 day / 4000 night (Swiss govt)
6000 day / 6000 night (Russian govt)

And here we have the outdated, controversial British government safety limits:

47000 day / 47000 night (British govt!)
61000 day / 61000 night (British govt! - lower frequencies)

On a final note... SMS messages emit very little EM radiation.
And using your own phone is always going to be worse than passive EMR from others around you, as long as they are at least 3 meters away from you, owing to the fact that radio waves decrease in strength by distance by inverse squared law (decrease very much more rapidly than in the linear fashion that many people expect).

03/08/2021

** How much radiation leakage comes form a microwave oven? **

Good afternoon folks, welcome to another Celestian lab test.
Today we will be looking at the radiation dosage from a typical cheap consumer grade microwave oven at various distances and making some comparisons and safety levels checks.

As always, I am using top of the range industry grade equipment for these lab tests which costs a lab upwards of £35,000 typically. The tests are carried out empyrically with the most precise measurements possible using fully calibrated equipment and cabling. For this test I'm using an Anritsu spectrum analyzer and an Aaronia log periodic antenna.

So, - on to the test results for this 800watt small microwave oven placed 20cm from a kitchen wall with door and left side facing towards the measurement equipment:

30 cm : 4691 mV/m peak and 2679 average
100cm : 3945 mV/m peak and 2115 average
200cm : 1974 mv/m peak and 1880 average
300cm : 1410 mv/m peak and 846 average

The measurements were each carried out over a 30 second period of the microwave being operational whilst heating a bowl of water at standard power setting. Bear in mind this is a small microwave that is probably putting out about 700watts max. Larger variants of up to almost a kilowatt may give somewhat higher results.

Let's do some comparisons with typical measurements for other RF transmitters...
Mobile phone at 1m: 2650 mV/m
Wifi at 1m: 1700 mV/m
Smart meter at 1m: 4000 mV/m

As usual, here is a list of safety levels set by various European commitees, scientific consensus and independent safety organisations on EMF:

IGNIR: Day avg: 60 mV/m / night avg: 20 mV/m
Bio Initiative: Day avg: 40 mv/m / night avg: 30mV/m
Salzburg comittee: Day avg: 61mV/m / night avg: 9mV/m
EuropaEM report: Day avg: 200mV/m / Night avg: 62mV/m
EU parliament: Day avg: 613mV/m / Night avg: 200mV/m

And the outdated and controversial British government safety limits:
Day or night at high frequency: 47000mV/m
Day or night at lower frequency: 61000mV/m

If you wish further information, or would like your house testing for RF radiation sources and levels, then please see my website at www.celestian.net or message me as I am available to be booked for professional surveys.

The technical stuff:

This microwave oven has a magnetron transmitter (the same thing used in many radars) which in this case is probably transmitting at around 600watts, and is surrounded on most sides by protective metal shielding made of copper or aluminium. Without this shielding you would be irradiated by nearly 139,000mV/m of EM radiation at a 1m distance.
Thus it has roughly a 34x shielding factor, making the effective wattage of radiation getting through its shielding equivalent to a 385mW mobile phone at 1m (that's nearly double the typical power of a mobile phone) or similar to a 190mw Wifi transmitter at 1m.

30/07/2021

Mobile phone exposure with distance from your head - a study:
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So, folks, - today I'm going to be carrying out a lab experiment to evaluate the question:
How much worse is RF exposure in close proximity to a handset?
As usual, this study is carried out in an empyrical, scientific way with top of the range industry certified equipment costing upwards of £30,000 by Anritsu & Aaronia AG, and all fully calibrated.

The test was carried out in a 5x7m room in a standard cavity wall house with the phone resting in free space, 1M from a wall. During a call the antenna on a tripod was gradually moved further away from the handset (an HTC U11 smartphone).

The results:

0.5M = 4022 mV/m
1M = 3503 mV/m
2M = 1595 mV/m
3M = 891 mV/m
5M = 505 mV/m
The measurements are given in field strengths of millivolts per meter at 5 distances. A measurement was also made at 2cm proximity (as in standard usage scenario) however this result is not included as it is a Near-Field value and thus can't be relied on. But I estimate that the field strength with the phone next to the head is at least 10,000mV/m as a minimum and possibly as high as 15 or 18,000.

The results clearly show that using a wired hands free kit (not bluetooth) will reduce exposure by at least 2 or 3 times and as much as 5 fold.

Interestingly, you need to be almost 4 meters from your handset in order to be in compliance with EMR safety standards as set out by European RF research committee reports such as the Seletun consensus, and 12 meters away to adhere to safety standards set by EuropaEM 2016 and Salzburg, or 45m away to meet IGNIR and BioInitiative standards.

The science explained:

Modern mobile phones typically transmit with a power up to 250mW, though this is highly dependent on signal strength to the mast (obstructions etc) and whether the phone is plugged in, or in powersave mode etc).

Mobile phone antennas transmit in 360 degrees simultaneously on the horizontal plane and about 70 degrees vertically. Meaning anyone in the vicinity is receiving a similar EMF exposure dosage depending on distance from handset.

EMF exposure is also dependent on reflection (particularly indoors) where exposure may be higher than expected owing to radiowaves bouncing off walls and furniture around.

Handset exposure will be significantly lower in areas with good line of sight to a nearby mast owing to smartphones adaptive power feature which reduces transmit power to the lowest possible to reach the mast, which may be up to 4 or 5 times lower than in an area of poor signal where the handset must transmit max power.

27/07/2021

Why you're better off not using a phone while it's plugged in...

In this smartphone test, I will evaluate the RF radiation doses from several usage scenarios and post the results below.

The measurements from all my tests are obtained in the most empyrical ways available and using state of the art industry measurement equipment by Anritsu, as used in research labs around the world. This ensures accurate, calibrated results every time.

This small study utilised an HTC U11 smartphone as the transmitter and an Aaronia 60200X calibrated antenna as the receiver. It was tested inside a 4m x 5.5m room in a standard cavity wall construction house with a 3 bar signal strength on the phone and antenna mounted such that no other phones or masts had a possible interference line of sight.
All tests were carried out with transmitter and receiver in exactly the same location with a distance of 4 meters between them. Here are the results:

HTC LTE uplink (battery) : 301 mV/m
HTC LTE uplink (plugged in) : 408 mV/m

HTC LTE download (battery) : 307 mV/m
HTC LTE download (plugged in) : 452 mV/m

For comparison, I also tested WiFi uplink emissions at: 70 mV/m

Conclusions that may be drawn from this test:
Using your phone on data while it's plugged in for charging can result in around 40% stronger emissions, and corresponding field strengths hitting your body than when on battery power.
Keep in mind that these measurements were made 4 meters from the phone! Exposure levels would be considerably higher for a phone held close to the face.

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