Any one with bad return loss on port 2 (less than 20dB) at 1.5 Ghz ?
On Sun, Aug 16, 2020 at 11:18 PM Peter Ide-Kostic via groups.io
Thank you for your reply
1) Please find below the trace between 1.4 and 1.6 ghz, of course there no
change (as expected)
2) The cables are fine I am sure, they are quality SS405 cables of 25 cm
3) To make a long story short, it is the owner of the Aliexpress shop
himself who informed me that he could no longer deliver the genuine model
<https://nanorfe.com/nanovna-v2.html#> that I had initially ordered in the
April time frame as he had switched supplier. I do not want to enter into
details but I was quite lucky with this specific transaction on aliexpress,
I waited a very long time (with at least 3 different shipping attempts) .
When the device finalmly arrived it had been damaged by transport . The
seller then simply offered me to send me the models coming from his new
supplier which I have accepted.
On Sun, Aug 16, 2020 at 10:55 PM CT2FZI <ct2fzi@...> wrote:
Did you calibrate from 1.4GHz to 1.6GHz and tried to measure it again?nanovna
Did you tried using another cable?
Why you say it's a clone?
A domingo, 16/08/2020, 21:48, Peter Ide-Kostic <on7yi.pik973@...>
I bought a nanovna V2 <https://nanorfe.com/nanovna-v2.html> on
while ago. When I received it, I realized that it was a clone which I
not expect, but ok, I managed (as usual)S21
I then checked the performance vis a vis of the official nanovna-v2
specifications <https://nanorfe.com/nanovna-v2.html#specifications> .
Fortunately, on the positive side, there was no problem regarding the
dynamic range and regarding the S11 noise floor that both met the
V2 specifications. However I was a bit puzzled to discover that thereturn
loss of port 2 of my clone was unfortunately much higher than what isproblem
official return loss specifications for port 2
20dB at 1.5 Ghz, 13 dB at 3 ghz
my measurements after calibration (see picture)
15.7 dB at 1.5 Ghz and 9.5 dB at 3Ghz
I wondering if
- I am doing something wrong the way I did this measurement
- if I am the only owner of a clone with this specific performance
on port 2range I
- if owners of the genuine nanovna V2 also have the performance issue
- what is the value of the attenuator that you possibly use on port 2
during calibration to compensate for the sub-optimal return loss (I use
between 6 and 12dB depending on the accuracy I need and the dynamic
am willing to sacrifice)
Thanks for sharing your return on experience regarding this issue