The NASA one. In English please?

Holy shit I can explain that one! I work with military satellite antenna, and this makes sense to me. So the signal out to the probe and coming back both have assigned freqs that they use. Now the ones I see never have a Doppler effect because I only talk to geostationary satellites. But at the distance of that probe the Doppler ( think the sound of a fire truck coming and going are shifted in pitch) would be noticeable. The shift also effects the bitrate, which you can read as bandwidth. The difference between bandwidth and bitrate is bitrate has redundancy to cover weather screwing up your data stream. So the workaround was changing the angle of the probe’s path so the Doppler effect changed, and the modem would work again.

the Doppler is a result of the objects moving away from each other (post separation) in this case. Cellular radios have to account for this effect as well for when you are driving in a vehicle and you are approaching or regressing the mobile station relative to the base station. in "olden days" circa up to mid 2000's, this was done by using a DAC to adjust the actual reference clock going into the modem to shift the frequncy of transmission to account for the Doppler. modern designs just use a DSP to "fix it in post" effectively.

The bandwidth comment from the article has to do with the sampling rate of the ADC within the radio - Nyquist theory for SNR, you have to be able to sample at twice the rate of your signal wafeform to be able to de-alias it. with the frequency shift due to Doppler, the sampling rate was no longer the minimum 2x needed, and this is largely due to them having a fixed reference clock for the ADC, i would guess. other signalling methods like NRZ encode the clock in the bitstream, but that's more for wireline than wireless (or optical). Cellular networks have the benefit of GPS timing to aid both the BS and ME to synchronize their clocks to be able to keep themselves phase and frequency aligned. for CDMA(95 /2000) this was a requirement for the handset to support GPS, whereas for GSM/WCDMA they just started with an assumed clock rate and used a carrier channel for broadcast of sync messages.

TBH i still don't understand the work around, since they seem to be implying that Doppler is directional only in one field - i assume these are using parabolic and not omnidirectional antennas, so the Doppler would be present regardless of orientation between the two components. They make it sound like they just reduced the impact of the frequency shift to be able to fall within the sampling window available by making the two probes separate at a slower rate (which may be exactly what they did, just isn't clear).

Thank you! Also see previous joke. :)

I said IN ENGLISH PLEASE!

No, it was very clear, thank you. It was a bit hard to parse.

Sorry about the formatting. I was on my phone on SE while in a waiting room when I wrote that.

I once had a problem with my motherboard no longer recognizing that it had built in wifi. It turns out to be a known bug on that model, and the only way to fix it is to physically unplug the power cord and plug back in. A reboot won't work, needs an actual interruption of the power supply.

this is because your motherboard is never really "off". it is in a deep sleep state, but certain functions remain powered so that you can do wake-on-LAN and other functions. if you every got around to changing the clocks and multiples in your BIOS system, you'd also find that the changes were stored in a batter-backed RAM,and not a true non-volatile storage medium. So if you were fucking around trying to overclock your system and got it into an unstable config, the fix was to yank the power cord as well as pop out the coin cell battery, then plug the system back in without the cell, and it would revert to the (ROM-based) defaults.

Batter-backed RAM was merely a tempura solution.

or Hot Prawn?

i'm not even going to fix my typo(s) now. Uni'd to get out more.

I once had to boot a motherboard, and then unplug the BIOS chip and plug in a different BIOS chip, so that I could flash new new BIOS with updated firmware for a different motherboard. Amazingly, it worked.