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22

Disclaimer: Any modification to this circuit will likely make it illegal to operate under FCC regulations(in the US), and likely other regulatory bodies in other countries! The antenna is the section highlighted in the photo. The PCB trace between the collector of Q1 and the top of L1 is the antenna load, and the trace wrapping across the top of the PCB is ...


14

The antenna is the rectangular loop trace at the top edge of the PCB. Transistor Q1 is the oscillator. L1 is probably used to provide DC power to Q1, and C1 and C2 are part of the matching and resonating network.


1

Firstly, you should try and draw schematics so that they can be displayed properly: - Secondly, you should not use the Rser statement because it hides the important fact that there is 60 Ω in series with the AC source. Well, I say it hides it; I'm not actually sure what it does with LTspice so, better to explicitly show it as a resistor. And, with Rser at ...


4

DSSS vs OFDM: these are different standards (a/g/n vs b, which is obsolete). This situation where you'd need to detect the differences never arises: a beacon from an access point is either of these standards, and that defines what the whole network does. Since the channels for these different modes don't even match, there can't be interoperability. A card ...


0

That's two diagrams in one: The background one, the turquoise zig-zag, is called a waterfall; the vertical axis is time, the horizontal is frequency, and power is coded into color. the line at the bottom is something else; maybe just a time trace; it's at the very least not a representation of the spectrum at the same bandwidth, because otherwise, the ...


0

These are two different traces. The blue one at the bottom is the raw signal with its received power (in dBm, left scale) vs. time. -90 dBm is 1 pW of received power. The colored one is the spectrogram with time on the vertical axis and frequency on the horizontal axis.


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