Reginald,
for the sake of accuracy, Erik designed the tinySA, inspired by
the nanoVNA. The nanoVNA itself was originally designed by
eddy555, a Japanese Radio Amateur, whose design was then adopted
& adapted by Hugen, a Chinese Radio Amateur, to become the
pre-built nanoVNA which is available today. And that design itself
has spawned both a wide degree of ownership and the inspiration
for further low-cost VNA designs.
Erik did use the nanoVNA-H4 hardware as the basis for his
tinyPFA.
The hardware of both the nanoVNA (-H and -H4) and the tinySA make
extensive use of SA612 mixers, SA5351A-B-GT frequency
synthesizers, STM32F3xxxx microprocessors, USB powering &
communication, a Lithium cell, and ChibiOS for the firmware, plus
other bits & pieces. That is a very powerful mixture
that can readily be re-purposed, as Erik has demonstrated. [And
other ?processors and OSes are both available and very useful, of
course.]
73, Stay Safe,
Robin, G8DQX
PS: Much more at ,
plus where the links lead.
On 14/08/2023 01:50, Reginald Beardsley
via groups.io wrote:
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Hi, Daniel,
My first post here also as I just found the list. I strongly recommend a tinySA or nanoVNA H4. Just make sure you don't get a clone. So check the [email protected] list for legit sellers. Erik designed both. They produce a square wave (Si5351), so you need a low pass filter for the band of interest. A 3 element Cauer will suppress all harmonics by -50 dBc or better.
