I bought a EU1KY designed analyser kit from Funtronics as a visual solution to my MFJ259. Thanks to the wonders of opensource software and clever people its been expanded on recently so I upgraded the sw yesterday.
Hans Summers (QRPlabs) uses the same DDS (SI5351) in his projects and he has found that they operate way above their 150MHz spec. So I was subconsciously thinking I wonder if the analyser would do that too…..so google led to updated software that does indeed use that facility. Not content with using the 3rd harmonic for access to 70cms someone thought about using the 5th harmonic to extend the upper range too. So if you take say 275MHz (the software determines Fmax of your own chip and saves it) x 5 you can cover 23cms=1375MHz. I also wondered if there was any spare A/D in the chip, but that too has been addressed and added to the hardware/software which now shows battery remaining.
It’s pretty amazing what it can now do. I checked a dummy load I’ve built (DC-1300MHz), some 70cms cavities from a junk sale for tuning range and my 23cms flat-plate 8, plus it measures coax lengths like a dream.
Latest capabilities http://wkiefer.de/x28/test/Analysator_1.4%20English.pdf
Kit/box bought from here https://www.elekitsorparts.com/product/ ... zer-eu1ky/
STM32-F7 Discovery board from here https://uk.farnell.com/stmicroelectroni ... /2480961or indeed digikey if you need to make up order value.
73
Gareth
A nice piece of kit....
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Re: A nice piece of kit....
Bit too late for Xmas for me, but looks most interesting and possibly an early birthday present next year!radiogareth wrote: ↑Sat Dec 08, 2018 8:56 amI bought a EU1KY designed analyser kit from Funtronics as a visual solution to my MFJ259. Thanks to the wonders of opensource software and clever people its been expanded on recently so I upgraded the sw yesterday.
Hans Summers (QRPlabs) uses the same DDS (SI5351) in his projects and he has found that they operate way above their 150MHz spec. So I was subconsciously thinking I wonder if the analyser would do that too…..so google led to updated software that does indeed use that facility. Not content with using the 3rd harmonic for access to 70cms someone thought about using the 5th harmonic to extend the upper range too. So if you take say 275MHz (the software determines Fmax of your own chip and saves it) x 5 you can cover 23cms=1375MHz. I also wondered if there was any spare A/D in the chip, but that too has been addressed and added to the hardware/software which now shows battery remaining.
It’s pretty amazing what it can now do. I checked a dummy load I’ve built (DC-1300MHz), some 70cms cavities from a junk sale for tuning range and my 23cms flat-plate 8, plus it measures coax lengths like a dream.
Latest capabilities http://wkiefer.de/x28/test/Analysator_1.4%20English.pdf
Kit/box bought from here https://www.elekitsorparts.com/product/ ... zer-eu1ky/
STM32-F7 Discovery board from here https://uk.farnell.com/stmicroelectroni ... /2480961or indeed digikey if you need to make up order value.
73
Gareth
73
Andy