#189 JUNTEK PSG 9080 External Reference and Ground Mod

#JUNTEK #PSG9080

[grosserkuchen]

thank you very much again, very nice mod

[cthoadmin]

Your workbench is so clean! Doesn’t look like it has even seen a drop of solder.

[thdrizzl]

how do the 3000 series hantek compare to this I'm torn I need a unit and can spend up to around 400$ this is for someone who I'm teaching and they need it to do whatever they will need and we know its now 1000+$ unit

[raindropsrising]

Really cool to see the inside and your lab. Thanks 🙏

[NikiBretschneider]

What is the lowest step you can tune that reference output? Despite there is no possibility to turn off the compensation inside the generator unit, there is still possibility, that if you tune that reference slightly off the 50MHz and input the "right" correction constant into that generator unit, you end up with much better results than you have now. The reference is stable. Even if it is tuned a little bit off the 50MHz. And that compensation is just a number that shifts the divisions/multiplications inside that generator unit, so if theese two things are stable, then the result must be stable too. Theese two things both goes in steps and the accuracy of the result depends on, well, stability of that reference, but also on how that two steps/values sits each other. So as I saw the long string of zeros in the reference programming software, I thought myself that maybe, maybe there is some space to improve the result of this modification. I know, it's a lot of fiddling with upredictable result, but, at least, it's easy to put it all back as it was if/when you realize that this was nothing more than nowhere leading bad idea.

Second thing. Are you a 100% sure that that compensation constant is only software frequency correction and does not affect frequency of that internal reference? I am pretty sure, that that constant does the software compensation, but I am not so sure that it does ONLY software compensation. I am thinking of things like two different compensations affected by one number, like e.g. some part of that number affects software compensation and other part varies some voltage applied to the internal reference. And it is easy to be sure if it is software thing only, or not, just hook up the internal reference to the counter and vary that compensation constant. If the output frequency stays stable, then it is software only. And on top of that all. I am not sure about some simple corelation between the entered number and the quantity of compensation. It's chinese product, which means be prepared to anything.

[arvelinoalmeidajunior]

I need to synchronize the generator with the oscilloscope
The port sync out phase syncs other generators
Is there some resource I can be using to extract the start sync pulse out?
thanks

[yurkshirelad]

Can you recommend a cheap signal generator for a beginner for audio frequencies, that doesn't need a ground mod?

[OctavMandru]

Dear Tony, I think you permanently referenced the PSG ground to the coax ground (with that short wire), which is permanently referenced to the main ground like you said.
Just connect the coax shield before the ground mod.

[hectorpascal]

Feeding signals to an "unobtainable" LSI control chip - even via a blocking C - is just a bit too scary for me! I'd feel much happier with better buffer isolation.

[davidadkins]

Which is better the Juntek PSG9080 or the Uni-T UTG962?

[vocal]

Здравствуйте, хотел спросить а генератор JUNTEK PSG9080 можно запрограммировать там где программируются последовательность различных сигналов во вкладке FUNC, чтобы работали SWEEP, VCO и модуляция?
Если не знаете, попробуйте пожалуйста, очень нужно знать, делаю выбор.
Hello, I wanted to ask if the JUNTEK PSG9080 generator can be programmed where the sequence of various signals is programmed in the FUNC tab so that SWEEP, VCO and modulation work?
If you don't know, please try, I really need to know, I'm making a choice.

[smith.randall]

Great video! Lots of info, toggle switch, why to reboot when switching from int. to ext., resistors…..👍
Bummer!! That the software worked against you.

It doesn’t seem that any of the AliExpress generators have an ext ref?? I think we would all pay $10 more more that option.

⭐️⭐️⭐️⭐️⭐️

[victorp]

In case of bricking due to firmware update failure, switch on ACmains button WHILE kepping pressed keypad "8" and push PwrOn once, then release keypad "8". This will bring up bootloader menu alowing you to reflash propper firmware. Just happened to me.

[SQDBF]

Hello. I'v made a GPSDO PCB for my almoust same generator JDS6600. You will have a problem - manufacturer put a little correction offset in the software of generator.
Therefore the output frequencies will be incorrect if you will inject exatly 24.000 MHz

[karlD]

Drifts terribly, even after 24 hours warm-up. A real shame it doesn't
have a 10MHz ref input to lock it down. I want to like the unit, but
it's useless for precision radio work.

[MultiSentence]

Hey Tony, I like your videos because you share a lot of information in a nice way.
I bought a PSG9080 last week and had a bad idea to make a firmware update!
Unfortunately, it bricks the device :-( Do you have an idea how the reactivate it ?
Any idea is welcome ;-)

[ppaolosan]

Nice Looking weak components ...mine faulted just 3 months of use ....faulty display ..no spare part, no support, the factory don't respond to my emails

[ivandrimal]

Tony, there is a video on Youtube with instructions on how to adjust the internal clock to some calibrated standard. It is not perfect, but it is possible to adjust the FY6900 to be as accurate as possible (within its capabilities). However, I also use a Juntek PSG9080 and I am quite happy with it. Otherwise, you are doing good and worthwhile work for others. Thank you.

[zxztv]

Maybe you should have tested the idea first, it is a shame it's not a perfect idea :-(.
I'm not picking fault, We all want to see the result Now!! :-D
That is a strange waveform, would a squarewave reference help at all?
Oh my frend said people from your area are the nicest and relaxed people in the world.
I'm not making that up.

[gtsaviation]

Hoi Tony. Ik heb me gelijk geabonneerd nadat ik je callsign tegenkwam via je vader, F4VUP. namens PA1JOS. Hele interessante onderwerpen, en goed belicht kerel. Wie weet tot werkens op 1 van de banden. 73 van PH5V :-) 😎