Electromagnetic Details?

Mudita Products
39

I bought a Stolp through Mudita. I don’t yet have EMR measurements for it, but I ordered an EMF meter and will post my measurements later.

Meanwhile, I can tell you that putting my Android-7 cellphone inside my Stolp DEFINITELY blocks the cellular connection to my T-Mobile-based MVNO.

If I put my 4G-connected phone in the Stolp and then call the cellphone’s #, the audio in the calling phone goes quiet for at least 30 seconds before my MVNO plays the voicemail greeting associated with the cellphone #.

BUT, if I turn on Airplane mode BEFORE putting my cellphone in the Stolp and then call the cellphone #, then my MVNO takes only about five seconds to answer the call and play the voicemail greeting.

This suggests two things:

  1. Activating Airplane mode on my cellphone sends a signal to my MVNO that I have done so BEFORE my cellphone turns off its Bluetooth, Wi-Fi, and cellular radios.
  2. If my cellphone’s cellular radio is active when I put my cellphone in the Stolp, then my MVNO will make SEVERAL attempts to ring my cellphone – probably through several cellular towers – before giving up some 30 seconds later and rolling the incoming call to voicemail.

Analogy:

  • Putting my cellphone in Airplane mode is analogous to letting a secretary know that I am leaving the office. If someone subsequently asks the secretary for me, then the secretary knows immediately to take a message for me.
  • Putting my cellular-radio-connected cellphone in a Stolp is analogous to sneaking out the back door of the office. If someone subsequently asks the secretary for me, then the secretary will waste a lot of time before finally taking a message for me.

Update:

I got a TriField TF2 EMF meter, switched it to its “RF” mode, and tried to get milliWatt/square-meter (mW/m2) readings of my Android-7 phone in various radio modes (Bluetooth on or off, Wi-Fi on or off, and 4G cellular on or off). Because I made all my readings in an environment that is full of other RF signals (I don’t live in a Faraday cage.), I could not get a ‘calm’ baseline reading no matter whether the phone was away from the meter and outside the Stolp, near the meter and outside the Stolp, or near the meter and inside the Stolp. However, I can say that the meter readings jumped upward tremendously when I had the phone with the phone screen on and all three radios on inside the Stolp and then opened the cover to the Stolp.

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