It is not uncommon for the sma-terminated pigtail cables that come with the
nanovna to fail, or to not have been assembled well. Sometimes the shield
is not soldered at the connector, so it passes test at the factory, but
fails the first time you bend it. I ordered a set of better sma pigtail
cables, and haven't had a problem with them.
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On Wed, Sep 6, 2023, 2:51 PM Allan Johnston <adhjohnston@...> wrote:
Dave, W0LEV,
It's looking like an intermittent good then bad connection with the
NanoVNA.
The nanovna is connected with the unit's supplied connectors/coax and
additional connector as needed for the antenna.
See attached "nanovna usual bad trace" jpeg that shows the connectors.
The RigExpert connection does not include the small diameter nanovna coax
cable.
As I set up the RigExpert and NanoVNA for review and photos I discovered
the flaky intermittent connection in the run of small coax and connectors.
The bad connection is so random that I cannot tell what connector is the
problem.
More hunting!
Thank you for your response. Your questions helped me discover what is
biting me. At least I know the NanoVNA is working.
If you or anyone else has comments on the trace or the
equipment/coax/connector setup that may help me out then please don't
hesitate to respond.
Al. KA0VIA
On Wed, Sep 6, 2023 at 12:31?PM W0LEV <davearea51a@...> wrote:
How are you connecting the NANOVNA? Identical to the method used for the
RigExpert? Where does the trace show on the Smith Chart of the NANOVNA?
Is the trace consistent with the SWR indication?
Once your NANOVNA is calibrated, have you gone back with your cal.
standards and verified the calibration took correctly? Have you verified
your cal. standards on the RigExpert or some other method?
I know.....just a bunch of questions, but I'm searching for possible
problems.
Dave - W?LEV
On Wed, Sep 6, 2023 at 5:27?PM Allan Johnston <adhjohnston@...>
wrote:
The Nanovna h4 in use was purchased from R&L Electronics a year or so
ago.
Last month I updated the software.
The Nanovna has never given me "good" results as compared to a
RigExpert
AA 650 zoom when measuring HF, VHF or UHF antennas.
The Nanovna has been calibrated for each frequency range. The RigExpert
AA-650 zoom passes the self test.
Example; the Rigexpert reads a SWR of close to 1:1 for a 2 meter
antenna
that is externally mounted while the Nanovna results show 50:1.
Any ideas?
Thanks,
Al, KA0VIA
--
*Dave - W?LEV*
--
Dave - W?LEV
