I have few more images about it which show the different mode. The unit was not connected to a signal or component. Would you like me to post them?
I have few more images about it which show the different mode. The unit was not connected to a signal or component. Would you like me to post them?
Could you elaborate how you think the phase is being affected and how is this relevant if you are comparing the phase at the input to the output?
It’s a relative measurement after all.
I'm not sure why you are being so dismissive. This topology definitely works.
Dear DC1MC,
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I'm not sure why you are being so dismissive. This topology definitely works.
Definitely not being dismissive, although I would've been before the PE42020 came out. What you posted could very well be what they're doing.
But through personal experience I've learned that there are very few free lunches in a VNA block diagram. Spectrum analyzers are downright trivial by comparison.
As you get up into the GHz range, isolation in particular is hard.
I'm not sure why you are being so dismissive. This topology definitely works.
Definitely not being dismissive, although I would've been before the PE42020 came out. What you posted could very well be what they're doing.
But through personal experience I've learned that there are very few free lunches in a VNA block diagram. Spectrum analyzers are downright trivial by comparison.
As you get up into the GHz range, isolation in particular is hard.AFAIK what makes things extra difficult is the fact that a 50 Ohm directional coupler works well for looking at a '50 Ohm system' but if you are looking at a system with an impedance of 1k Ohm or 1 milli-Ohm then the VSWR will be very far off anyway and thus measurement accuracy and resolution are going to suffer. I have a low frequency VNA (10Hz to 300MHz) and that offers various ways of doing measurements. I think this Siglent VNA will be handy for measuring antenna's and other typical circuits in the 50 Ohm or 75 Ohm realm but it may be less usefull for measuring milli-ohm impedances in circuit board power distribution.
AFAIK what makes things extra difficult is the fact that a 50 Ohm directional coupler works well for looking at a '50 Ohm system' but if you are looking at a system with an impedance of 1k Ohm or 1 milli-Ohm then the VSWR will be very far off anyway and thus measurement accuracy and resolution are going to suffer. I have a low frequency VNA (10Hz to 300MHz) and that offers various ways of doing measurements. I think this Siglent VNA will be handy for measuring antenna's and other typical circuits in the 50 Ohm or 75 Ohm realm but it may be less usefull for measuring milli-ohm impedances in circuit board power distribution.
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?
I guess market for lower end VNAs is not very big? If something like this would be priced so that its attractive to "average" Amateur Radio hobbyist, Siglent probably would sell orders of magnitude more....
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?
Looking at the port labels I am guessing that it will need an external coupler for S11 measurements...?
So the explicit answer is no – and maybe that’s also one reason why the frequency range is limited to 1.5GHz. It’s pure speculation on my side, but I recon it would be difficult to cover an even wider frequency range with just one coupler or even bridge and for now Siglent sure didn’t want to have to switch between several of them – not to mention the increase in cost.
I guess market for lower end VNAs is not very big? If something like this would be priced so that its attractive to "average" Amateur Radio hobbyist, Siglent probably would sell orders of magnitude more....
We don’t know the price yet, so why starting to complain already?
There are still lots of folks buying the Rigol DSA815-TG, aren’t there? The new Siglent SVA1015X will cover the same frequency range, but with supposedly better specs, e.g. lower resolution bandwidth and lower phase noise. I don’t think the fact that this machine can be easily upgraded to a VNA, Fault locator and Digital Modulation Analyzer makes it less attractive for potential users.
Price will be around 1.5k$ what makes it quite interesting (of course including TG).
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?
1.5Ghz seems rather low for a VNA these days.
Is there a 3.2 and or 6Ghz version as well?
Rohde&Schwarz do not think so.
Just ago launched new FPC1500 Spectrum & VNA base model is 1GHz.