Please ignore my empty message - it was sent in error.
On Fri, 11 Oct 2019 at 14:46, Dr. David Kirkby <
drkirkby@...> wrote:
Fri, 11 Oct 2019 at 12:49, Kurt Poulsen <kurt@...> wrote:
i QRP RX aka qrp.dds ?
Although it is done with the NanoVNWA-saver and using my HP85033C 3.5mm
kit for calibration I get same result using the suppled male kit. This
image proof the high quality of the NanoVNA and the best condition used for
it investigation. The small bump extreme left is due to the 300MHz spikes
when NanoVNA switches over to harmonic operation. OZ2M Bo has explained
some time ago why the NanoVNA should not have gone beyond some 275MHz in
fundamental mode, but "who in hell" measures around 300MHz ?.
The benefit of using my data is when you calibrate at the end of a test
cable and want a calibration at the SMA male adaptors calibration plane,
then you must use NanoVNA-user and enter the female data. When the sweeping
a semirigid cable - now with a female adaptor at the end of the semirigid
cable, (I have male and female in the two ends) you will see the trace is
running outside the Smithchart if you have a female female adaptor with
loss, because thee loss is embedded in the calibration (see attached
image). If not then the trace will follow the circumference just like the
male calibration did.
If you do not have a semirigid cable use a good quality short SMA test
cable of some 220 to 30cm length and see it spins inward due to the loss in
the cable. Select a S11 dB trace and observe the trace and note marker
values for the two different calibration. For male calibration at Ch0
directly will show no difference I am sure but time will show what you
experience for a female calibration.
Hope this is of help
You may show us your findings
Kind regards
Kurt
-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af QRP RX
Sendt: 11. oktober 2019 12:15
Til: [email protected]
Emne: Re: [nanovna-users] A way to improve the accuracy of the
calibration of a male SMA connector
Hi Kurt,
yes, I just found your message.
Could you please clarify how I can check if cal-kit setting will help or
not? What I should check after C0 change?
On Fri, Oct 11, 2019 at 12:57 PM Kurt Poulsen < <mailto:kurt@...>
kurt@...> wrote:
Hi qrp.dds
YES !!! I did publish these yesreday
Kind regards
Kurt
-----Oprindelig meddelelse-----
Fra: <mailto:[email protected]> [email protected] <
<mailto:[email protected]> [email protected]> P? vegne af
<mailto:qrp.ddc@...> qrp.ddc@...
Sendt: 11. oktober 2019 03:42
Til: <mailto:[email protected]> [email protected]
Emne: Re: [nanovna-users] A way to improve the accuracy of the
calibration of a male SMA connector
Does someone tried to measure parameters for cal-kit supplied with
nanoVNA?
--
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT,
United Kingdom
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...
Telephone 01621-680100./ +44 1621 680100
Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom
