[Btw, why you need sync from sweep generator.
It is because of the problem described in my first post if you read it. I thought the title of this thread is self-explanatory.
Do i have too much time on my hands to create problem for myself? Shall i go out to pay more money to buy higher end signal generator if what i got is not working as expected? I am not a gearhead with a deep pocket.
SDS1002X-E have really lot of different trigger and other features for this
It can be done with manual adjustment by setting a high threshold level in order to stabilize the sweep pattern. It is time consuming and tedious to stablize sweep patterns without synch signal. I say it is hit and miss. I dont know if you know about alignment of FM IF stages and discriminator valve tube / transistor radios. Every time, you tune the ferrite slugs, the peak amplltudes of the sweep response pattern varies and you have to vary the trigger threshold level. I would describe it as fiddly. With S-curve for the ratio detector, this approach is even more fiddly if the ratio detector is badly out of alignment.
Just this: "It can be done with manual adjustment by setting a high threshold level in order to stabilize the sweep pattern. It is time consuming and tedious to stablize sweep patterns without synch signal. I say it is hit and miss."
Do you think scope really do not have any more sophisticated trigger functions. So I will write bit more.
If I am home I just make it for you with images and test setup and trigger setting guide.
Starting from 60's I have aligned IF filters in many kind of radios, including also professional communication radios etc etc and lot of other things in hobby and also later in profession. Of course in history and in work there was R&S SWOB etc tools and of course later more sophisticated tools. In hobby side mostly analog scopes and analog commercial or even DIY sweep gens controlled by scope.
Old times with analog scope in this case it is important to have ext trigger from generator. With analog scopes I have used method where analog scope generate ramp to control VCO what sweep syncronized with scope horizontal sweep ramp. Many Analg scopes have this output.
Also,
ancient digital scopes need in this case trigger from sweep generator (in this case from SDG830 working as sweep gen) But you do not have ancient digital scope, even when is is not expensive mode.
Modern digital scope, like Siglent SDS1000X-E series (in home I have them many but I can not demonstrate to you because I am thousands of km far from home) have lot of different trigger functions what also works quite accurately because these scopes have true digital trigger engine (deeply inside heart getting data from ADC directly and before any decimation) instead of ancient digital scopes analog side pathway trigger system, what in this price class was mostly poor)
Perhaps you do not need trigger pulse from SDG830 at all. It is fully possible you can set oscilloscope to sync to sweep output start. ( this depends SDG830 waveform details when it goes to sweep upper freq and then jumps to start freq. And this was why I ask you take screenshot just from this moment when it retract so we can see this special waveform for help you to find right trigger method and adjust it and also there is reason why I ask to use single direction sweep as example just from down to up)
And when it start down to up you can also set oscilloscope horizontal reference position example to left of display or example 5 dif left from center. After then it is fixed there and not center so it do not move if you change t/div.
But first work is adjust oscilloscope trigger so that it do enough perfect sync directly from 10M sweep output.
For this you need perfect image about signal what details happen just when it is reached upper limit and retract for start new sweep. There is key what you need for set scope to sync. I do not know what there is but sure there is fast frequency hop.
Now because your main signal go via filter under working it is very possible signal what is out from pass band is too weak for reliable trig for example to this frequency change instead of level change alone you need split signal from generator to two pathway. One where is constant level to Ch2 and other to DUT and then to Ch1.
Now you set all trigger things in Ch2 and signal for looking is Ch1.
Also for make this frequency step trigger bit more easy, specially if filer under work is very narrow, you can still sweep more wide and spread this image in scope. Trigger can be out from display.
Now there is one small "cosmetic" problem in this method. If it sweep, just example for thinking" one time in second oscilloscope do not trig exactly every second some times it keep 2 second pause, in worst case 3 second. Why.
Again, reason can find when looking this signal detail when frequency hop from end of sweep freq to start freq. It happen randomly what ever phase in signal. But when your sweep interval is more high and work is adjust filter it can do even when it some times drop out some single sweep.
You need learn what all trigger functions are and how these parameters are need adjust and how they affect.
Just normal trigger as rising edge and trigger level is not for this, not at all.
And again repeating, need know exactly this sweep retract waveform details in all cases also when frequency jump phase is moving. After then you can easy design what parameters you can use and set for trigger system.
This sync to sweep is fully oscilloscopes work and with advanced trigger functions you perhaps do not need at all separate trigger from sweep generator.
I know learning is hard work...
If I have, say example normal IF filter for commercial wide FM reception and IF is this usual 10,7MHz and I have SDS1x02X-E and SDG830 and normal other needed small things I can do normal center and width alignment etc. It is not even difficult. Of course due to oscilloscope linear vertical scale there need forget some things where need high dynamic range at once on display. So stop band check and possible alignment is not for this. (With SDS1x04X-E models can do lot of more... but it is totally other story)
First break your locked thinking circle road and try other roads without hitting head again and again to some same rock what is in this case missing trig out (sync) signal from generator even if it is bug or not. Generator have sweep output where is signal what change. Why not use these changes for sync. Your scope have quite impressive amount of trig functions. One example is that you can define slope angle if there exist just special enough different angle in signal once when sweep retract.
And, do not use this signal to trig what goes thru filter under work to scope for display bode. Split signal after generator also to other channel what you use only for produce sync (trig) so you are not in troubles when signal is low due to out from filter pass band. This splitted signal you have more stable signal level for detect example signal some edge rising or falling slope, what is one possible method. (Use other main channel, not ext trig channel, it can nolt produce this sync)
One possible method. You know this trigger function where you set two levels and then time window. Then ignal signal need cross over these points inside defined time window and direction. Of course it is more nice if there can AND / OR / XOR cascade these trig rules or more advanced method but there is not. But in this case I think one rule is enough. With previously told disadvantages.
Also for perhaps more nice bode like image you can use detector probe... no need tell to you because you work with radios.
It give more usable dynamic range for you for working without overload scope front end amplifier. (you can then set bode straight bottom (what is now your vertical center line) to display area bottom and then you have some more dynamic range (6dB).)
Because I can not demonstrate it now for give evidence I will stop here. If you still not understand perhaps some ones can help.
I am sure you need only SDG830 and SDS1x02X-E.
You do not need separate trig (sync) signal from generator.
Just produce this sync inside your scope using features what are there and all you need for this is generator sweeping output signal. It need some skills but no need any extra tools or investments.