Cheers,
I had the same issue, placed an order through our business to get SMA
calibration kit from kirkbymicrowave.
Money spent, nothing arrived, my advice is against. Can anyone post here
what happened to the old chap and business?
I can advise, what I did after:
Obtain very good SMA PCB edge connectors, highest quality you can afford.
Open and Close standards are straightforward, trim the pins, reuse offcuts

for making Close standard.
For 50 Ohm buy expensive Vishay RF resistors, e.g. Part:  CH0402-50RGFTA
https://www.mouser.co.uk/ProductDetail/Vishay-Sfernice/CH0402-50RGFTA?qs=bZr6mbWTK5l8pl0WkFCzkw%3D%3D&mgh=1&vip=1


See also https://www.vishay.com/docs/60093/fcseries.pdf
Solder resistor directly on trimmed SMA, to get the same electrical length

as your newly created open and close standards.
In case of parts shortages, you can also use 100 Ohm resistors in
parallel.
Please forget 0.1%. it does not matter on tool like NanoVNA and indeed any

VNA.
More important than DC accuracy is to have 'flat enough' characteristics
in
the whole range of calibration frequency.
Cheers
TKa
73 de Mi6HQA

On Sun, 1 Dec 2024 at 08:42, Team-SIM SIM-Mode via groups.io <sim31_team=
yahoo.com@groups.io> wrote:

Hi All

Where to bye an accurate  50 Ohm +/- 0.1 Ohm  SMA Load  to ensure a good

quality NanoVNA calibration ?

Indeed  the most important capability of a nanoVNA is to be calibrated

by

an external reference 50 Ohm load,  the firmware with  it's float point
computing will do the rest, all quality or default of NanoVNA will be
affected by the quality of the calibration  Load 50 Ohm ,  if it has a
large band resistor behavior without resonnance or parasitic inductors

or

capacitors and if it has an accurate resistor value to be refered to,  i

am

not so sure that the loads given by NanoVNA vendors are very accurate ,
ohmetre measurement  gives 50 Ohm +/- 1 Ohm wich is no so good . i would

like to bye a better 50 Ohm load reference to be sure to have a good

wide

band value calibration .

73's Nizar