Nizar Ibrahim 2022/09/07 14:01
Hello everybody
Please I'm asking for help!
My Nano VNA is not working as usual. When I turn it on the S11 is dropping
to -30 dB without connecting anything. I just turn on the nano VNA and I
can see that on the screen :/ I tried to calibrate but it seems that it
doesn't work since the value is wrong (-30 dB) I see a sinusoidal signal..
(I have connected short and then load to port1 and I did the same with port
2 but there is nothing.. only this sinusoidal signal appearing..) Why is it
showing this value?? How can I set it to 0 dB to work normally??
Thanks in advance guys!
Nizar
ᐧ
Le mer. 7 sept. 2022 à 05:51, W0LEV <davearea51a@gmail.com> a écrit :
> Look it up, but I believe Coilcraft (not my favorite supplier) specifies
> 20% error on inductors of that sort.
>
> Dave - WØLEV
>
> On Tue, Sep 6, 2022 at 6:53 PM Leif M <leif.michaelsson@gmail.com> wrote:
>
>> I made a simple fixture for low frequency measurements and calibrated it
>> from 50k to 10MHz. A variable capacitor shows reasonable reading, about
>> 20pF to 500pF. But when I measured an old unshielded 143-17J12 Coilcraft
>> coil, I got 1.7uH from 50kHz to 10MHz.. But Coilcraft says it is 1.34uH.
>> There is a ferrite slug in this coil, but it is noted in Coilcraft table. I
>> begin to suspect that this is normal 15% error.
>>
>>
>
> --
> *Dave - WØLEV*
> *Just Let Darwin Work*
>
>
>
>