The notice[1] says it was operating in the 700 MHz band. The wavelength for this band is 42.9cm. A few sources I found (StackExchange, Anandtech) say a Faraday cage is effective with a mesh 1/20th the wavelength.

Surrounding the device with metal containing 2.1cm (0.85in) holes would probably work and only require minor modifications to support heat dissipation.

Side note, now everyone knows Victor Rosario in Brooklyn probably has a bunch of cryptocurrency...

[1] https://transition.fcc.gov/Daily_Releases/Daily_Business/201...

> Victor Rosario in Brooklyn probably has a bunch of cryptocurrency...

At 1155 GH/s, he has probably mined upwards of several dozen dollars worth of cryptocurrency this month. And an extra hundred dollars on his power bill, assuming it’s not included in his rent.

Brooklyn apartments this time of year are often poorly heated. If you're paying for the electricity to run a space heater, it might as well produce bitcoins.

Heat pumps are more efficient. A miner makes an inefficient heater.

And heat pumps are more expensive to buy and impossible for a tenant to install themselves in an apartment they rent from, which is why people use small portable and cheap resistive heaters.

And in that case, a miner is just as efficent if not more efficient since it's making the user some money (maybe).

First thing I found on Amazon US

https://www.amazon.com/Honeywell-MM14CHCS-Portable-Condition...

Portable heat pump + air con. I've had something like this before, typically comes with something to slot/seal up into a gap from leaving the window open. Can be moved between rentals.

Efficient in what units? Heat pumps are more efficient in BTUs/kWh, but I doubt you've done the pricing to say they're more efficient in BTUs/dollar, because that's fairly complicated.

Sure, lets say $500 for a heat pump, $50 for a heater. Then what 'yield' are you getting on the $450. Let's say heat pump is 2x as efficient (should be understimate). Let's say that you run 2kw normal heater for 1 hr / day winter only for 3 months. That's 180kwh. @12c that's $21.6. So you save $10 a year. A 2.2% yield tax fee. So admittedly not great.

OTOH a mining rig, well who knows that IS complicated. You might lose money, or spend a lot of time tweaking but break even.

Strangely, the Antminer comes in a metal case with holes smaller than that. Maybe it wasn't grounded or something? Or it was radiated through the external power supply wires?

EDIT: mixed them up, Spoondoolies ones had a nice mesh but the Antminer ones don't behind the fans. That 1" of plastic must be enough to let a significant amount through (or the power supply wires still)

Profit margins?

You dissipate the heat into the faraday cage. There's been a patent for this: https://patents.google.com/patent/US5901040

A metal mesh shouldn't compromise heat dissipation or forced air cooling.

You could literally just wrap it in chicken wire...