How is the experiment going? I’m going to be trying this soon, increasing gain between 11pm and 6am in the UK and seeing how that affects numbers.
Since a few days i have to shutdown my main receiver during nighttime.
My wife has a confirmed intolerance regarding environmental stress which includes electric power of devices close to her.
She’s wearing a watch which monitors stress, breathe and blood oxygene, it was immediately recognized once the device is not running.
Bought a network attached power socket which disconnects the RPi (after a clean shutdown) at a specific timeand bring it up again in the morning hours.
Unfortunately i cannot move the device as i would immediately lose signal strength and range. It is ok for me.
1 Like
@chrislfa My experiments and the use of graph1090 led me to identify some periods where I wanted different gain values.
For my location I came up with 21:30 to 06:29, 06:30 to 10:00, 10:01 to 14:00 and 14:01 to 21:29
pi@raspberrypi:~ $ crontab -l
30 21 * * * ./gainD.sh
30 6 * * * ./gainE.sh
1 10 * * * ./gainF.sh
1 14 * * * ./gainE.sh
So currently I have three simple scripts to adjust the gain values.
The gain values I use are peculiar to my site and its location.
What I try to do is ensure that I don’t have more than roughly 2% to 3% > 3dBFS over 24 hours (though that is just a ballpark - other users seem happy with 5%)
The other thing I kept an eye on was the ADS-B Signal Level to try and get the widest range between Weakest and Peak Levels.
So far I’ve noticed the number of Positions has improved, Aircraft not so much, but I think this has more to do with my location and proximity to RAF base at EGVN
1 Like
Thanks, we’re trying something similar which is related to mate’s location. For now I’ve got 3 differently named copies of the piaware-config.txt with the 3 different gains, and at set times and days via root’s cron they are copied to piaware-config.txt and dump1090-fa restarted. It’s working to adjust the gain, so I’ll let you know in a few days how it’s going.
0 8 * * 1-5 cp /boot/piaware-config-254.txt /boot/piaware-config.txt; systemctl restart dump1090-fa
0 18 * * 1-5 cp /boot/piaware-config-280.txt /boot/piaware-config.txt; systemctl restart dump1090-fa
0 23 * * 1-5 cp /boot/piaware-config-496.txt /boot/piaware-config.txt; systemctl restart dump1090-fa
0 6 * * 1-5 cp /boot/piaware-config-280.txt /boot/piaware-config.txt; systemctl restart dump1090-fa
0 6 * * 6-7 cp /boot/piaware-config-280.txt /boot/piaware-config.txt; systemctl restart dump1090-fa
0 23 * * 6-7 cp /boot/piaware-config-496.txt /boot/piaware-config.txt; systemctl restart dump1090-fa
1 Like
Curious what watch your wife has that monitors all that without electricity.
1 Like
we do not have any electric power in our bedroom. Everything runs on battery. So what are you talking about?
I’m just curious what you think batteries produce to run electronics that’s not electric power.
1 Like
You know exactly that I am talking about the high power devices running on 220V, not on the 5V of a battery. As your question is suspected to be provocative, i ignore it now.
1 Like
But you can’t fault his logic!!
Electric fields weaken at the rate of the inverse of the cube of the distance, so I think @K4HLW has a fair point.
A (incandescent) torch globe is about the only thing I can think of (that you are likely to find in a bedroom) that doesn’t turn the batteries DC into some sort of AC (or pulsed DC)
Have you considered running the Pi on a battery overnight? You could use the timer to control a charger during the day.
I am not saying he is wrong. But the way he is asking is somewhat instructive.
The electric field from a 220V power supply can be measured and approx 15% of all people are impacted. Some feel it, most do not. Unfortunately my wife belongs to the first part. It’s not there or at least not recognizable for devices running on battery or things like a bedlight connected directly without anc voltage change like a RPi power supply.
the device is currently down between midnight and 5am where we have the lowest traffic, so it’s not a big deal to have it down that time.
At some point i will decrease the downtime step by step checking if something changes for my wife.
But thanks for asking.
You could try to power the Pi with PoE (Power over Ethernet IEEE 802.3at) and leave the power supply at the other end of the house.
S
No way, device has to use WiFi, i cannot use additional cabling. The power connector is outdoor where the device is now getting it’s power from.
Rented flat, i am now allowed to drill any holes for cabling.
Just to be clear; she can hear a power supply operating outside the bedroom with the window closed?
I was suggesting PoE for the power so that the power-supply is further remote. The cable does not need to be used for data.
One of my Pi is powered with PoE but the data is still Wi-Fi.
S
Not hearing, but feeling.
https://www.who.int/peh-emf/publications/facts/fs296/en/
And again, everything which needs cable is not possible as i need to go through a wall and place cabling through different rooms.
Not worth just for operating an ADS-B Raspberry and we are bringing this thread to off-topic 
1 Like
From that paper:
“The majority of studies indicate that EHS individuals cannot detect EMF exposure any more accurately than non-EHS individuals. Well controlled and conducted double-blind studies have shown that symptoms were not correlated with EMF exposure.
…
There are also some indications that these symptoms may be due to pre-existing psychiatric conditions as well as stress reactions as a result of worrying about EMF health effects, rather than the EMF exposure itself.
…
…there is no scientific basis to link EHS symptoms to EMF exposure. Further, EHS is not a medical diagnosis, nor is it clear that it represents a single medical problem.”
That means… there is no “EMF exposure”.
I was part of the team conducting a such study in my college years. We put plants under HV lines and far away, no differences detected.
We measured people’s vital signs… double blind. Indeed a couple of females did developed stress indicators when they were placed in the proximity of power lines (visual distance, nothing dangerous), but that was regardless if the power lines were powered or not.
From the same document you can look into this:
“It has been suggested that symptoms experienced by some EHS individuals might arise from environmental factors unrelated to EMF. Examples may include “flicker” from fluorescent lights, glare and other visual problems with VDUs, and poor ergonomic design of computer workstations. Other factors that may play a role include poor indoor air quality or stress in the workplace or living environment.”
Good luck!
3 Likes
Well controlled and conducted double-blind studies have shown that symptoms were not correlated with EMF exposure.
There are also some indications that these symptoms may be due to pre-existing psychiatric conditions as well as stress reactions as a result of worrying about EMF health effects, rather than the EMF exposure itself.
It’s an interesting read, but doesn’t offer any specific treatment.
That’s a very high proportion of the population.
Did that number come from anywhere in particular?
The “what” is on topic. The “why” perhaps less so.
1 Like
I stand with Foxhunter on this topic. Just because someone wrote a paper and said EMF sensitivity cannot exist means nothing. Foxhunter supports his wife and she supports his hobby. He chooses to change how his own system works and some of you are giving him crap about it. Way off topic and small minded. Which is more important in the real world? Supporting your family or pushing them aside for a hobby?
Get real, enjoy every day, see the smile on your family members and understand what you do every day affects those around us. Foxhunter understands what is important and seems like some do not. I stand with him on how he chooses to support his wife.
3 Likes
I don’t think that is a fair assesment.
Several of us have quoted from the paper that Foxhunter posted - is that “giving him crap about it.”?
All of us have offered suggestions and work arounds - is that “giving him crap about it.”?
That’s not what the the paper says.
What it says is that under scientific testing, there is no evidence that it exists.
2 Likes
My wife is feeling better without having the device running during night. That’s what counts.
And it is independent if she knows it or not. I turned it on during night randomly without letting her know.
And she recognized it…
That’s for me more important than simply count some aircraft
4 Likes
3 Likes