Re: Antuino - the antenna analyzer
I was assuming the Antuino would have a set of front end filters for each region of interest.toggle quoted messageShow quoted text
Though the 25mhz IF is kind of low for this to be convenient.
Arv's DC receiver as a spectrum analyzer is also worth considering.
I've had parts here for a year or so to build a 0-55mhz spectrum analyzer
around two of the PX1002 86.85mhz SAW filters.
Seeing the Antuino, I'm inspired enough to have parts splayed out on my workbench,
an enclosure selected, am about to cut the bare PC board to fit.
Will build ugly style, use 3/4" copper pipe cut into 1/4" high cylinders
to provide a shield for each section, bolt a plate over the top once it works.
Signals going off to the next shielded section will have a wire through a hole
in the board to to where it's held down to the back groundplane using copper tape.
So almost coax, the one inch runs short enough that impedance won't be an issue.
But by selecting appropriate wire diameter and insulation thickness, might hit 50 ohms.
And if it works, maybe add another stage up front using a 915mhz SAW filter.
That first VFO would have to do something like 915 to 1500mhz.
Either a clock doubler on the 1000mhz si5340, or perhaps the si549.
But of course, I'll have a hard time looking at that stuff when it doesn't work.
Anybody have a feel for how well the cheap $200 laptop based spectrum analyzers
are doing? Is there much reason to homebrew other than as a hobby?
How do those $200 units compare to a Rigol SA?
On Fri, Dec 28, 2018 at 08:05 PM, Ashhar Farhan wrote:
the challenge would be to eliminate the if image. this could be done when you sweep to both sides and eliminate the image reading in software. here is an example :