User uhoh

24 votes

3 answers

3k views

Why is the reflector on this millimeter-wave antenna spinning?

asked Feb 12, 2017 at 8:53

23 votes

2 answers

21k views

Understanding the relationship between LoRa chips, chirps, symbols and bits

asked Jan 3, 2017 at 10:04

18 votes

3 answers

6k views

Wouldn't putting an electronic key inside a small Faraday cage render it completely useless?

asked Jul 4, 2019 at 8:13

15 votes

2 answers

795 views

Could a copper RF cavity like this be reasonably expected to have a Q > 7000?

asked Jan 22, 2017 at 11:52

14 votes

1 answer

10k views

Why is my fluorescent tube orange on one side, white on the other and dark in the middle?

asked Jul 30, 2019 at 13:49

13 votes

5 answers

1k views

GPS for Cubesats - is 8km/sec too fast for consumer chips?

asked Jun 6, 2016 at 12:42

12 votes

2 answers

3k views

Why do compass chips in cellphones require frequent calibration?

asked Aug 1, 2016 at 12:17

12 votes

1 answer

672 views

What are the ways in which semiconductor-grade neon is critical for manufacturing?

asked Mar 12, 2022 at 5:06

11 votes

2 answers

3k views

66 GPS channels for 22 satellites - why the factor of 3?

asked Jun 6, 2016 at 10:11

11 votes

4 answers

5k views

Are LEDs in modern streetlights usually pulsed? If so, roughly what frequency?

asked Jun 14, 2017 at 7:26

8 votes

5 answers

2k views

Are there types of standard coaxial cable with a propagation velocity of 0.9c? What would be the application?

asked Sep 24, 2017 at 15:52

8 votes

3 answers

656 views

In the recent Con-Ed transformer "fire", what exactly produced the color of the huge blue glow over New York City?

asked Dec 28, 2018 at 5:47

7 votes

3 answers

2k views

Why do the Duga-1 dipoles look like an array of birdcages?

asked Jul 6, 2019 at 3:52

7 votes

2 answers

692 views

What are the waveguide modes of twisted pairs as discussed here?

asked May 17, 2017 at 1:53

6 votes

2 answers

535 views

What is this antenna called, and what does the polarization and radiation pattern look like?

asked Apr 29, 2017 at 7:33

6 votes

2 answers

3k views

MPU6050 accel/gyro noise that behaves strangely - what might be doing this?

asked Oct 7, 2017 at 10:44

6 votes

5 answers

2k views

How low have mains frequencies gone? What areas once used 30 Hz, and why? [closed]

asked Jan 2, 2020 at 0:45

5 votes

2 answers

13k views

What exactly does C/No (dBHz) mean in u-Blox GPS data?

asked Dec 24, 2018 at 2:33

5 votes

1 answer

4k views

How deleterious is topping-off my Li-ion batteries (phone/laptop) every time they drop to 90%?

asked Apr 30, 2016 at 7:53

5 votes

2 answers

2k views

What is SEMTECH's "secret sauce" that makes LoRa Picocells viable?

asked Feb 8, 2017 at 8:48

5 votes

4 answers

2k views

How is the degaussing feature in the HMC5883L 3-Axis Digital Compass chip correctly used?

asked Aug 1, 2016 at 14:02

5 votes

3 answers

3k views

Electrical specification for minimum bias current available from 3.5mm cellphone microphone input?

asked Aug 4, 2016 at 2:05

4 votes

2 answers

136 views

Need help understanding why noise temperatures are added, but real temperatures aren't

asked Apr 27, 2017 at 6:44

4 votes

1 answer

671 views

Am I using Shannon-Hartley Theorem and thermal noise correctly here?

asked Jun 6, 2017 at 19:08

4 votes

2 answers

124 views

1960's video showing early computer design & simulation of a low-pass filter circuit?

asked Apr 16, 2019 at 13:54

3 votes

1 answer

257 views

Is there an industry term for IC "drop-in" circuits used for malicious or clandestine purposes?

asked Feb 3, 2019 at 0:32

3 votes

1 answer

6k views

How can I estimate the optical power that a single-color LED generates?

asked Aug 26, 2017 at 14:34

3 votes

1 answer

2k views

Can 900MHz and 2.45GHz Antennas be differentiated by shape?

asked Dec 27, 2016 at 15:23

3 votes

2 answers

1k views

How does the Infineon REAL3™ depth sensing imager chips measure time of flight for each pixel?

asked Feb 23, 2017 at 13:37

2 votes

2 answers

815 views

How does triple level cell FLASH memory achieve 3 bits per cell?

asked Mar 12, 2017 at 11:43

Stack Exchange Network

54 Questions

Why is the reflector on this millimeter-wave antenna spinning?

Understanding the relationship between LoRa chips, chirps, symbols and bits

Wouldn't putting an electronic key inside a small Faraday cage render it completely useless?

Could a copper RF cavity like this be reasonably expected to have a Q > 7000?

Why is my fluorescent tube orange on one side, white on the other and dark in the middle?

GPS for Cubesats - is 8km/sec too fast for consumer chips?

Why do compass chips in cellphones require frequent calibration?

What are the ways in which semiconductor-grade neon is critical for manufacturing?

66 GPS channels for 22 satellites - why the factor of 3?

Are LEDs in modern streetlights usually pulsed? If so, roughly what frequency?

Are there types of standard coaxial cable with a propagation velocity of 0.9c? What would be the application?

In the recent Con-Ed transformer "fire", what exactly produced the color of the huge blue glow over New York City?

Why do the Duga-1 dipoles look like an array of birdcages?

What are the waveguide modes of twisted pairs as discussed here?

What is this antenna called, and what does the polarization and radiation pattern look like?

MPU6050 accel/gyro noise that behaves strangely - what might be doing this?

How low have mains frequencies gone? What areas once used 30 Hz, and why? [closed]

What exactly does C/No (dBHz) mean in u-Blox GPS data?

How deleterious is topping-off my Li-ion batteries (phone/laptop) every time they drop to 90%?

What is SEMTECH's "secret sauce" that makes LoRa Picocells viable?

How is the degaussing feature in the HMC5883L 3-Axis Digital Compass chip correctly used?

Electrical specification for minimum bias current available from 3.5mm cellphone microphone input?

Need help understanding why noise temperatures are added, but real temperatures aren't

Am I using Shannon-Hartley Theorem and thermal noise correctly here?

1960's video showing early computer design & simulation of a low-pass filter circuit?

Is there an industry term for IC "drop-in" circuits used for malicious or clandestine purposes?

How can I estimate the optical power that a single-color LED generates?

Can 900MHz and 2.45GHz Antennas be differentiated by shape?

How does the Infineon REAL3™ depth sensing imager chips measure time of flight for each pixel?

How does triple level cell FLASH memory achieve 3 bits per cell?