Dear Hans,
many thanks for interesting and useful information. My initial suggestion
of a scheduled scan has exactly this purpose, to eliminate the influence of
cables or operator.
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On Mon, Nov 4, 2019 at 4:55 PM DJ7BA <dj7ba@...> wrote:
Hi Andy,
I cannot support your last statement:
> The UTP cable will have some influence on the antenna but not
important I think
That UTP cable is just as much detuning your antenna by common mode
current as feeding the antenna by coax without balun would do.
Common mode current via the NanoVNA and the UTP cable to ground has just
the same detuning effect.
If in doubt, see attached powerpoint.
NanoVNA grounding by holding it in your hand can be avoided by mounting it
on a PE board as shown in the pic.
The 6mm PE board was hot air bent a bit in a vice, because of the inclined
SMA connectors. The PE board was
left long for holding it without touching the NanoVNA. Insulation is more
practical than needing a suitable balun
for each antenna situation.
73, Hans
DJ7BA
-----Urspr¨¹ngliche Nachricht-----
Von: [email protected] <[email protected]> Im Auftrag von
Ady, YO2NAA
Gesendet: Montag, 4. November 2019 15:12
An: [email protected]
Betreff: Re: [nanovna-users] Storing and recalling scan later via Nano VNA
saver (or similar) #internals #consolecommands
Usually, the distance to the antenna feed point is 15-20m in my case, but
it can be more on high towers.
Your suggestion to use a USB extender is a good one, thank you. It will
work great for YAGIs on a pole.
However, in the case of a wire dipole, all the UTP cable weight will put a
heavy load on the NanoVNA's USB and SMA connectors, unless the UTP cable is
tied up to the antenna using nylon rope. The UTP cable will have some
influence on the antenna but not important I think.
On Mon, Nov 4, 2019 at 3:45 PM Oristo <ormpoa@...> wrote:
Install the antenna on the working position
How distant is working position?
USB extender up to 150ft costs < US$10
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