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new owner of NanoVNA

Syd
 

I just got this unit today in the mail and upon inspecting it I found the main unit, a USB power cable, 2 SMA jumper cables, and a package containing 5 small items. There were 2 SMA barrel connectors, and 3 termination SMA plugs. 2 of these plugs have a male center pin and measure 0 ohms ( shorts), the last SMA plug has no center pin so I am assuming that it will be used to make the open circuit calibration. As far as I know, there should have been a 50 ohm SMA plug to do the calibration.and if this is so I have a problem in that I have a missing part. Otherwise the unit looks fine and powers up just OK. Anyone have any idea of what to do about the 50 ohm terminator that is missing?
syd / wt1v
Bob Albert
 

Complain to the vendor.? However, 50 Ohm terminators are fairly common.? The only catch is that they are not pure at all frequencies so the one you use matters if you work at high frequency.? The resistance tolerance is important, as all your measurements assume it's 50 Ohms so if it isn't, say it's 1% high, all your readings will be 1% low.? Not too bad unless you are doing critical work.
Bob K6DDX

On Thursday, July 22, 2021, 06:16:07 PM PDT, Syd via groups.io <nhuq1@...> wrote:

I just got this unit today in the mail and upon inspecting it I found the main unit, a USB power cable, 2 SMA jumper cables, and a package containing 5 small items. There were 2 SMA barrel connectors, and 3 termination SMA plugs. 2 of these plugs have a male center pin and measure 0 ohms ( shorts), the last SMA plug has no center pin so I am assuming that it will be used to make the open circuit calibration.? As far as I know, there should have been a 50 ohm SMA plug to do the calibration.and if this is so I have a problem in that I have a missing part.? Otherwise the unit looks fine and powers up just OK.? Anyone have any idea of what to do about the 50 ohm terminator that is missing?
syd / wt1v
D M
 

Mine had 3 plugs. One Silver with a Pin was the 50 ohm, One Gold with Pin, and One with No Pin.
 

The 50 ohm is probably gray or partially gray with a center pin.
Syd
 

I have 2 bronze colored and 1 silver colored terminators. None of them measure 50 ohms! One of the bronze colored terminators has no center pin, so I am assuming that it is the open circuit terminator. A 50 ohm SMA terminator costs $4.45 on EBay.
wt1v
Bob Albert
 

I still think complaining to the seller is the right way to go.
Bob

On Thursday, July 22, 2021, 08:56:17 PM PDT, Syd via groups.io <nhuq1@...> wrote:

I have 2 bronze colored and 1 silver colored terminators. None of them measure 50 ohms! One of the bronze colored terminators has no center pin, so I am assuming that it is the open circuit terminator. A 50 ohm SMA terminator costs $4.45 on EBay.
wt1v
 

If its silver and has a pin, it's your 50ohm load.

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On Thu, Jul 22, 2021 at 10:56 PM Syd via groups.io <nhuq1=
[email protected]> wrote:

I have 2 bronze colored and 1 silver colored terminators. None of them
measure 50 ohms! One of the bronze colored terminators has no center pin,
so I am assuming that it is the open circuit terminator. A 50 ohm SMA
terminator costs $4.45 on EBay.
wt1v
Syd
 

I did and the vendor didn't know what a 50 ohm, SMA dummy load was!!!!!
 

I got an original one (not a clone) in a black box with gold lettering.
There was a plastic tray inside with indentations that held the three OSL
connectors and an SMA barrel, the two SMA cables, the NanoVNA and a
connecting cable for USB. Two of the SMA connectors were gold; one had a
shorting pin and the other was drilled out a bit where the pin would
ordinarily be. The 50 ohm load was in a silver connector. None of these
were in a bag except for the NanoVNA. The other components all fit in the
indentations.

Zack

On Thu, Jul 22, 2021 at 8:16 PM Syd via groups.io <nhuq1@...>
wrote:

I just got this unit today in the mail and upon inspecting it I found the
main unit, a USB power cable, 2 SMA jumper cables, and a package containing
5 small items. There were 2 SMA barrel connectors, and 3 termination SMA
plugs. 2 of these plugs have a male center pin and measure 0 ohms (
shorts), the last SMA plug has no center pin so I am assuming that it will
be used to make the open circuit calibration. As far as I know, there
should have been a 50 ohm SMA plug to do the calibration.and if this is so
I have a problem in that I have a missing part. Otherwise the unit looks
fine and powers up just OK. Anyone have any idea of what to do about the
50 ohm terminator that is missing?
syd / wt1v

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