[time-nuts] DIY VNA design

Bob Albert bob91343 at yahoo.com
Sun Aug 21 00:46:10 EDT 2016

I was interested in this, but my needs are mostly below 100 MHz.  I wonder what could be done similarly for this lower range...

    On Saturday, August 20, 2016 8:54 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:

 Another great posting, Attila.

When I was with Agilent, we looked at all kinds of
simplified network analyzer architectures, and I
would have to say the author is really well informed.
One issue he doesn't seem to be aware of is that the
ADL5801, when driven single ended, has some quirks
below 100 MHz that I discovered experimentally.
(The data sheet is silent on this).  IMHO, it
would be worth 7 Euro's to use a balun, however,
I would like to know the part number of this
supposed component.  I am not so sure about MCL
actually covering 30 MHz to 6 GHz in the same
balun.  Sometimes their advertising is confusing,
and when they say .03-6 GHz baluns, they mean
that the range can be covered in several bands
by several model numbers.

Still, quite impressive work by an individual


On 8/20/2016 7:19 PM, Attila Kinali wrote:
> Moin,
> I stumbled over a new open hardware/source VNA design:
> http://hforsten.com/cheap-homemade-30-mhz-6-ghz-vector-network-analyzer.html
> Unlike other designs out there, this one is very well done and has very
> little room for improvement, without increasing the price considerably.
> About the only things i would do different is to use two receiver
> channels, one fix connected at the TX source to be able to do a
> difference measurement between TX and the RX channels and thus
> improving precision. And the other would be to use a dual ADC
> with an FPGA for the data processing, again in order to increase
> performance.
> But as I wrote, both changes would increase complexity and price.
> Other than being a well thought through design, the website also
> explains all the big design choices and why this or that has been
> done instead of one of the many alternatives. That alone makes it
> worth reading, IMHO.
>             Attila Kinali
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