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2N3055:

--- Quote from: BillyO on May 06, 2024, 09:33:49 pm ---
--- Quote from: 2N3055 on May 06, 2024, 09:13:03 pm ---I still wait for actual use case that requires external clock in in general use.

--- End quote ---
Do you consider ham radio general?  Or networking or any other pursuit that deals with a lot of cabling?  Time domain reflectometry requires an accurate time base.

--- End quote ---

TDR?  If clock on scope has 20ppm absolute error , how much is that going to influence measurement of the length of the cable? That is 20m on 1000km length type of error. I assure you cable dielectric will have much greater span of propagation velocities than 20 ppm.

As for HAM and accurate frequencies, if 7 digits frequency readout is enough that could benefit from better accuracy, that would be good example.

Martin72:
I can well imagine that a highly accurate clock and the ability to synchronize other devices to it has its special justification.
In general, however, I have certain doubts.

radiolistener:

--- Quote from: tautech on May 05, 2024, 07:51:36 am ---This is current supported for 4ch X-E DSO range as an option......these are 200 MHz max DSO's operating well below any 2.4 GHz WiFi.

--- End quote ---

They produce very wide bandwidth noise from 10-20 kHz to 5 GHz (for 5GHz protocol) and above. On SDR receiver I clearly see noise floor raising for about 5 dB when I enable WiFi on my router, I also see noise from neighbors WiFi routers.

I also can see 20-30 dB spikes from DC up to 300 kHz when my WiFi router transmits the packets (in idle state it produce pulse with about 0.5-2 Hz rate), the same I can see about 2-5 dB spikes from my neighbors WiFi routers in 0..300 kHz band.

WiFi router has about 2 Watts TX power at 2.4 GHz, or even more for some models, which is pretty high to affect your measurements.


You may not notice these interferences in usual oscilloscope mode on display, but it don't means that it is missing. You can found it if you record sample and analyze it on computer.

temperance:
If the ref. clock is important, you will probably also need an appropriate trigger system and some other requirements related to to delays in the ADC when also considering that the ADC are in interleaved mode when only 1 ch for 1 ADC is active.

Who has the ability to measure for example aperture delay jitter when the ADC's are working in interleaved mode? If you happen to have that kind of equipment available I can only wonder why you are toying around with a budget scope. For those interested I can dig up a book on high speed ADC's from Analog device and scan some pages if I'm not too lazy with all formulas you need to perform such a "simple" measurement for which you will probably need equipment of which many in here (including me) don't even know the price.

As someone else said:

--- Quote ---I'll be blunt.  Customers want everything, and want to pay nothing for it. That is just the way it is.
--- End quote ---

2N3055:

--- Quote from: radiolistener on May 06, 2024, 10:18:33 pm ---
--- Quote from: tautech on May 05, 2024, 07:51:36 am ---This is current supported for 4ch X-E DSO range as an option......these are 200 MHz max DSO's operating well below any 2.4 GHz WiFi.

--- End quote ---

They produce very wide bandwidth noise from 10-20 kHz to 5 GHz (for 5GHz protocol) and above. On SDR receiver I clearly see noise floor raising for about 5 dB when I enable WiFi on my router, I also see noise from neighbors WiFi routers.

I also can see 20-30 dB spikes from DC up to 300 kHz when my WiFi router transmits the packets (in idle state it produce pulse with about 0.5-2 Hz rate), the same I can see about 2-5 dB spikes from my neighbors WiFi routers in 0..300 kHz band.

WiFi router has about 2 Watts TX power at 2.4 GHz, or even more for some models, which is pretty high to affect your measurements.

--- End quote ---

I agree with you.

Problem is not 2.4GHz but demodulated artefacts.
It is same problem like when your can hear interference in cheap computer speakers when phone is close...

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