# Tag Info

Accepted

### Could the electromagnetic field (EMF) from a power station disrupt wireless signals?

Not generally. Power stations generate signals at 60 (50) Hz, while 'wireless' signals start from AM radio (~ 1 MHz) up to many GHz. A sensitive radio will have a front-end filter that prevents any 60 ...
• 12.4k

### Why does the quality factor include 2*pi?

There is no fundamental reason -- it's a convention, and happens to be convenient. 'Q' could have been defined to not use the 2π term, but then many calculations using it would require a 2π factor ...
• 12.4k
Accepted

### Unreliable wireless comunication between 2 arduino boards

Apparently, the EMI gods are not kind to your layout of ground and signals so motor current pulses might be interfering somewhere. Without a full layout and list of assumptions from known good designs ...

### Why does the quality factor include 2*pi?

Let me start with an example: Parallel connection of Rp and C (a lossy capacitance). Energy: W=Integral (from 0 to t=To) over v(t)*i(t)dt. Using i_c=C(dv(t)/dt) and i_r=v(t)/Rp with v(t)=Vmax*sin(wt) ...
• 22.5k

### Can I solder a wire antenna to the exposed PCB antenna of a BBC Micro Bit to boost its bluetooth signal?

Sure you can. Cut the trace antenna and solder a suitable 50 ohm 2.4ghz tuned antenna to it, and ground. But should you? You may find that you have little to no performance increase. The trace antenna ...
• 70.6k
1 vote

### Unintentional Beamforming

If you send the same signal on horizontal polarization as on vertical polarization, you end up with a slant polarized signal at +45 deg, and nothing at -45 deg (or vice versa). If you can CHOOSE ...
• 1,719
1 vote
Accepted

### Multipath destructive and constructive fading and the law of conservation of energy

Yes it obeys conservation of energy. All areas of constructive interference have a corresponding area of destructive interference. The additional energy you see in constructive areas is taken from ...
• 10.4k
1 vote

### Coding and SNR gain

Noise is an unwanted part of the physical signal which is used to transfer the data bit stream along wires or radio path. A part of the noise cannot be avoided because it exists as a part of the ...
• 21.1k
1 vote

### Wireless power transfer through stainless steel

At my opinion, typical double U-shaped transformer divided into two parts will solve the problem due to low permittivity and conductivity of vacuum steel. But there will be problems due to vacuum. ...
• 176
1 vote

### Is it possible to measure the distance of a WiFi access point from the receiver?

I would have to say in my opinion, long answer yes (with some work) short answer no. The way I see it would be either through signal strength or the amount of time it took to get the signal. Correct ...
• 11

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