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15:23

allan2

56:22

nerds97

nerds99

For nerds only! This is the 99th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. The channel 2 reference oscillator had significantly more phase noise than the one in channel 1. Increasing power made a significant improvement, but below 0.5Hz offset from the carrier channel 2 is still more noisy than channel 1. The improvement will make measurements significantly faster.

Відео

15:23

nerds98

Переглядів 44021 день тому

For nerds only! This is the 98th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. There have been noise bursts - and finally I have found the problem. Teflon dielectric trimmer capacitors in LC circuits are now replaced by fixed capacitors and slug tuned inductors.

56:22

allan2

Переглядів 6683 місяці тому

Various measurements of Allan deviation and comparisons of results between TinyPFA with TimeLab, Linrad and Linrad with TimeLab. An error by a factor 1.4, the square root of two is found an corrected in Linrad.

45:11

nerds97

Переглядів 4064 місяці тому

For nerds only! This is the 97th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. Here I use a TinyPFA to measure Allan deviation. Results from Linrad agree reasonably well..

11:18

Allan

Переглядів 2694 місяці тому

I have added the computation of Allan deviation in Linrad. In this video I try to verify that the new code is correct by a comparison with the results from a HP5370A with TimeLab. Results are questionable. The 5370A is noisy in the short time scale while my Linrad setup is noisy in the long time scale. Only at tau about 20 seconds both systems see (perhaps) the noise from the test oscillator.

1:24:08

nerds96

Переглядів 2574 місяці тому

For nerds only! This is the 96th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. Here I focus on close range phase noise and how it looks in the time domain with Allan deviation and frequency vs time. Several problems with correlation measurements are discovered and correct...

1:28:56

sidebandnoise2

Переглядів 2415 місяців тому

Here the phase noise measured with a Rohde & Schwarz FSUP is compared to new measurements with Linrad. Agreement is very good except for an oscillator with high amplitude noise. An oscillator from Wenzel shows much lower phase noise at 0,1 Hz offset when the frequency control potentiometer is set to its end position. Filtering the DC supply to suppress AC down well below 0,1 Hz is important eve...

32:24

nerds95

Переглядів 5286 місяців тому

For nerds only! This is the 95th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. Here I continue to look for noise sources in my oscillator that starts in nerds80. The flat noise floor is good, -182 dBc/Hz, but the noise very close to the carrier is not. I find I need to re...

16:45

nerds94

Переглядів 1796 місяців тому

For nerds only! This is the 94th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. Here I improve the isolation between the oscillators in my correlation setup and find it was not necessary. Further I check flicker noise from the attenuators in the interferometer.

1:37:05

nerds93

Переглядів 2036 місяців тому

For nerds only! This is the 93rd in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. More on the low noise oscillator with two crystals. I am trying to reproduce the very good performance I saw initially with this design. I found reasons to modify my correlation setup before co...

57:40

nerds92

Переглядів 2,1 тис.8 місяців тому

For nerds only! This is the92nd in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. More on the low noise oscillator with two crystals.

1:18:37

nerds91

Переглядів 2,5 тис.9 місяців тому

For nerds only! This is the 91st in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. Here I rebuild my first 10 MHz 3-rd overtone oscillator which I have used for sideband noise measurements. As it turns out, the main problem was the stiffness of the PCB material used to build ...

1:07:58

nerds90

Переглядів 66110 місяців тому

For nerds only! This is the 90th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. Here I look at the influence of noise on the power supply on the phase noise of the two-crystal oscillator and discover why the amplifier in front of the soundcard needs to be DC-coupled. Sudde...

1:48:23

nerds89

Переглядів 60711 місяців тому

For nerds only! This is the 89th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. More on the low noise oscillator with two crystals. Phase noise: @1Hz -127 dBc/Hz @10Hz -156 dBc/Hz @200Hz -175 dBc/Hz @2kHz -182 dBc/Hz The advantage of using two crystals is small. 3 dB only ...

32:48

nerds88

Переглядів 467Рік тому

For nerds only! This is the 88th in a series of videos about sideband noise in oscillators, frequency multipliers, the components we use to build them as well as the tools used to measure sideband noise. More on the low noise oscillator with two crystals. Here I try to reduce the sensitivity to infrasound, low frequency changes in the air pressure. Some components were found to be sensitive, bu...