Faraday cages are imperfect and designing a high quality cage does take work but GP is absolutely incorrect in that they are a "myth," or that they would be ineffective without precision engineering.
700MHz is a 42cm wave. A hole 1/10th of the wavelength is about an inch and a half. Not exactly tight tolerances.
Perfection generally isn't necessary - mitigation is usually sufficient. Reducing the interference signal by some percentage (likely a very, very high percentage) goes a long way.
Dropping a wire cage around a device broadcasting in the 700MHz band is going to very significantly reduce the signal.
I made a bet once, claiming that a cellphone wouldn't work in a microwave (obviously, with the microwave not operating) because it's a Faraday cage. We'd get a call going, put the phone in the microwave and close the hatch. See if the call drops. The tech back then was 900Mhz GSM.
I lost that bet.
While we were at it, we tried all sorts of metal containers one can find in a household, and couldn't find anything that would make that GSM call drop.
Not taking any position on the actual effectiveness of Faraday cages, but I'm pretty sure cell phones can handle a order of magnitude or two (10-20dB) drop in signal strength on a good day, especially if your Faraday cage is also blocking all the background noise the signal would usually be competing with.
> "Reducing the interference signal by some percentage (likely a very, very high percentage) goes a long way."
Sure, that's true. But the point is that even a high percentage may not be sufficient; a 90% reduction only improves the situation by 10 dB; a 99% reduction is an improvement of only 20 dB. As the sibling post illustrates, today's receivers are very, very sensitive; cell phones, I believe, have sensitivities below -80 dBm.
700MHz is a 42cm wave. A hole 1/10th of the wavelength is about an inch and a half. Not exactly tight tolerances.
Perfection generally isn't necessary - mitigation is usually sufficient. Reducing the interference signal by some percentage (likely a very, very high percentage) goes a long way.
Dropping a wire cage around a device broadcasting in the 700MHz band is going to very significantly reduce the signal.