Gerard,
It looks like the latest H and H4 firmware from DiSlord also has the Port-Z rescaling.
--John Gord
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On Sun, Aug 7, 2022 at 11:34 AM, John Gord wrote:
Gerard,
In addition to the variable resistance fixture method, there is provision in
some firmware versions to mathematically modify the displayed data to show
what the response would be in a system with Z0 other than 50 ohms.
I think that this feature is available only for the V2 and later versions
because of the memory limitations in the original NanoVNA.
You can set Z0 to say, 330 ohms for typical 10.7 MHz ceramic filters. I don't
know how well this would work at 4kohm.
The DiSlord firmware has the Port-Z setting in the DISPLAY menu. The
ojisankoubou firmware has the Port-Z setting in the DISPLAY/SIMULATE menu.
--John Gord
On Sun, Aug 7, 2022 at 03:04 AM, Gerard wrote:
Hello,
I have a lot of 2 poles filters 20J26 Motorola and 45R15AZ.
I can¡¯t find the datasheet of these filters on the net, except on a site
that tells me that the 45R15AZ is a 3rd harmonic filter, but no datasheet.
So I have no value of termination resistance and capacity.
In addition, if you take a common model like a 45M15A, you find different
values depending on the manufacturer, it ranges from 560 Ohm/1pf to 4KOhm
-1pf.
My question is whether we can measure these values with a nanovna or some
other method.
and if you have the datasheet, put it.
Thank you
