You don't need "precision" resistors. "Close enough" like 47 or 51-ohms
for a 50-ohm non-inductive resistor. The most importance consideration is
that it's non-inductive.
Dave - W?LEV
On Thu, Nov 7, 2024 at 9:08?PM William Schrader via groups.io <wtschrader=
[email protected]> wrote:
Gervail:
Thanks for the tip*. There really is NO definitive, easy-to-understand
users' manual for the NanoVNA-H4. There are many YouTube sites that you can
find. I've looked at many of them as I learned how to use mine.
One guy's presentations have impressed me the most. His call is W2AEW, and
the YouTube to one of his instructions is at:
.
* Caution about that clever "breadboard" that you showed: I think it will
be a great one, EXCEPT at higher frequencies in VHF/UHF. That's just
because the lead-lengths become important up there. But, I'm gonna have to
try it out for myself. [I just bought a pair of shielded test leads that
have male SMA at one end and small alligator clips at the other. The trick
in selecting was to find a pair where the shielding went as far as possible
to the end. Many of the ones i found on AMAZON had a short jumper from the
SMA connector to a splice point, from which two separate long lengths of
unshielded wire emerged to go to the alligator clips. I think that
arrangement is a big mistake. I have some hf bandpass filters to align;
will see how these new cables do --once they get shipped in a couple of
weeks [Hurry up, Guangzhou--I havent got all day!]
73
Bill K2TNO
On Thu, Nov 7, 2024 at 8:50?PM Gervail Antoine via groups.io
<gervail.antoine@...> wrote:
Really interesting document, I'll definitely try to reproduce the steps
and I will be really happy if I can make it work.
And also really nice little fixture.
I did a bit of digging and found this kind of board, I guess it would be
easier for me to calibrate as I don't have any non inductive precision
resistance to calibrate.
Did any of you ever used that before ?
--
*Dave - W?LEV*
--
Dave - W?LEV
