Electronics > Beginners
Triggering on AM modulated signal
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aneevuser:

--- Quote from: alsetalokin4017 on December 01, 2018, 05:40:38 am ---It's in the Trigger Coupling menu. I haven't tested it to see if it will work in this particular case; I'll leave that to the OP.
--- End quote ---
I see. That's another menu that I've yet to investigate. This thing is swarming with hidden features.


--- Quote ---(Doesn't the FY6800 have a TTL output on the back...? My MHS5200 does...)

--- End quote ---

Yes, but how does that help?

It also has sync in/sync out connectors but the manual seems to suggest that they are used to synchronise multiple devices - I have no idea how that works though, or what signals it supplies on the sync out. I'll have to plug it into the scope to see if i can see anything useful there.
tggzzz:

--- Quote from: aneevuser on December 01, 2018, 12:52:42 pm ---
--- Quote from: alsetalokin4017 on December 01, 2018, 05:40:38 am ---It's in the Trigger Coupling menu. I haven't tested it to see if it will work in this particular case; I'll leave that to the OP.
--- End quote ---
I see. That's another menu that I've yet to investigate. This thing is swarming with hidden features.

--- End quote ---

That's a classic problem with modern scopes. The older analogue scopes had the advantage that all controls were visible on the control panel.


--- Quote from: aneevuser on November 28, 2018, 01:16:27 pm ---In fact, one of my reasons for playing around with modulated signals is to try to overcome my previous negative experiences of RF electronics (in brief: nothing I made ever worked properly, AFAIR), so this is something that I will definitely be trying at some point, regardless of the fact that the "trigger on CH2" technique works fine.

--- End quote ---

You might like to keep in mind that scope are often the wrong tool for looking at RF signals. They are insensitive, have lots of non-linearities (think intermodulation products), and work in the time domain whereas many RF operations are better considered in the frequency domain.

Consider the usefulness of:

* spectrum analyser: sensitive, linear, show amplitude vs frequency
* modulation domain analysers: show frequency (or time-interval) vs time - very good for FM, chirps, VCO settling times and similar
* network analysers: show transfer functions and impedances vs frequency
aneevuser:

--- Quote from: tggzzz on December 01, 2018, 01:40:49 pm ---
That's a classic problem with modern scopes. The older analogue scopes had the advantage that all controls were visible on the control panel.
--- End quote ---

Right. I think that I may have to break the habit of a lifetime and read the manual.


--- Quote ---
Consider the usefulness of:

* spectrum analyser: sensitive, linear, show amplitude vs frequency
* modulation domain analysers: show frequency (or time-interval) vs time - very good for FM, chirps, VCO settling times and similar
* network analysers: show transfer functions and impedances vs frequency
--- End quote ---

All good points and true.

I have indeed considered the usefulness of such devices, and then my wife considered the prices on my behalf. She's so helpful like that!
RJSV:
Perhaps more to the point of exploring RF concepts and modulation,  I have a project designing a hardware circuit for FFT (audio spectrum detector).   Exploring the demodulation concepts, and simpler detection methods,  I came up with, at last,  an explanation of the software FFT
routines starting with a synchronous detector.  The circuit must align with both frequency and phase, by trying each possible combination.  That is essentially what a FFT routine does,  using classic 'butterfly' shaped diagrams...
   I possibly will post more details.  Yes, I know all this can be performed on a 1 dollar PIC chip, or other. 
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