Anyone know some material that could shield/block radio frequency pulses (around 58kHz.) I think aluminum works a little, anyone know what the best material would be, or any other material that would come to mind?
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I'll add to Barney's good answer. The coupling at this frequency is going to be dominantly magnetic, so I prefer something ferromagnetic. And, Maxwell said that there is no field inside a conductor but in practice that is true when the thickness of the shield is 3+ times the skin depth at the frequency in question. And, for 58KHz, the skin depth calculation makes for thick copper or aluminum. But, there is also a permittivity term in the equation and you get a big boost by using something like (nobody will believe this) common galvanized steel. Like garbage cans and tin roofs. And, it is cheap, can be soldered, and can be had at any hardware store.
58kHz seems pretty low to be a radio frequency, unless this is the modulation rate of an RF signal on a high frequency carrier. You called these pulses, which makes me think maybe this is the pulse repetition frequency of an RF carrier, as in the case of a radar. If that is the case, a Faraday shield/cage could work and knowing the RF carrier frequency would allow the proper material to be selected. If 58KHz is indeed the actual signal that is offending you, then ZORCH's answer above is a great one. Maybe this is not practical, but sometimes it is easier and cost effective to shield at the SOURCE of the offensive signal. Where is this signal coming from and why is it only bothering you? Do you have sensitive equipment?
58 KHz will sneak around anything, so you need to enclose whatever you are building on all sides, with the corners connected. At that frequency , the wavelength is very long (5100 meters), so you dont have to worry about seams. In other words, cracks are OK. You are basically sheilding the magnetic portion of the wave. All entrances such as power , audio, to the box must go through filters, such as 1uF capacitors grounded very close. To emphasize, you cannot put up a plate or even a 5 sided box to shield this frequency. Although its the magnetic portion of the wave you need to shield, you dont need iron. Any metal will do because it's AC. Copper sheet is available from a lumber store as roofing flashing, and it can be soldered.
