Pokemon myths

To start off, a hermetic seal is a airtight seal on a container. So the question is how is the seal made? A metal container would make a good Faraday cage and EMI (Electromagnetic Interference). If plastic, it would depend on the container. Most plastics are non-conductive and would not protect from EMI, but some are. Another option is to line the inside of the case with foil. This is very common with most modern small transmitters like cellphones and handheld two-way radios. They make plenty of models that are air, dust, and water sealed.

So without knowing more about the devices, it's really impossible to say.

In short hermetic seal =/= EMI shield and vice versa. Some electronics are EMI shielded without being hermetically sealed and some are. Purely depends on the design of the device.

What is the equipment in question? In a high EMI area, the usefulness of a device will depend on the function. Just some random examples: A DVD player would work fine if it is properly shielded. Where as a GPS,would not even if shielded. The GPS relies signals from outside to calculate position. If interference is strong enough to overwhelm the GPS signals, then it doesn't matter how well shielded it is, it won't be able to pick up a signal to work off of.

The question is how broadband is the interference and what signals are you trying to get?

You can have navigation devices that work of a compass and accelerometers to map a course, but they are not nearly as accurate or reliable.

so, in short, the shielded items would function, but might or might not get a usable signal.

Thing is, the headset is shown getting perfect signal no matter what is happening.

EM radiation. Space alien. Explosion. Nothing kills the signal.

cooling a hermetically sealed device is easy - you just put the heat sink outside the seal. (or more specifically, you make the heat sink part of the sealed enclosure)

so once again you are looking for a way to do something without using any of the bits and bobs that were designed to do what you want.

Like, say, an underwater camera.
www.scuba.com/scuba-gear/Underwater-Camera.html

hey, you do what you want to for a hobby. I mean, I go into burning buildings, who am I to judge. but don't expect me to not point out that if your hobby is reinventing the wheel, you might advertise it as such.

Back to the OP, on the headset, where is the signal that it uses coming from? If it is close enough to the transmitter, it could work, but if it is a long way away, then no.

Op states that birds and GPS are both affected, so that means a VERY broadband interference. Just going off of what the OP describes. Blame the writers.

Sorry, I wasn't overly clear in my last post. I meant that the comm headset could work if it was close enough the the transmitter of the comm signal. If it is close enough, a reasonable powered signal would have enough strength to be received over the EMI in the background if the receiver was close enough. Something like say a Bluetooth headset talking to a cell phone on someone's hip. However, a headset communicating with a base station several miles away would get lost in the EMI.

Also, frequencies above 100 MHz don't carry well over the horizon. Frequencies in the upper VHF and UHF+ bands are used for high data bandwidth but relatively short range communication, basically line of sight comm. Higher frequencies are also used because they penetrate better things like buildings, forests, etc. A UHF transmitter is lucky to get 50 miles with a high, tower, clear line of sight and a strong amplifier. To get further ranges, you need to get into repeaters. If you want to go long distances, you want lower frequencies. Something in the, say, 30 MHz and down range where you can get some atmospheric bounce to give you range. IF you are out in the middle of nowhere, If you want to hit a satellite, you want UHF to penetrate the atmosphere. HF to bounce a signal off the atmosphere and hug the ground for a long distance.