开云体育

Hello, all. Cool device to say the least.

I have a number of VNAs as well as scalar analyzers. I just picked up a nano as my brother was interested and I thought we would explore it together. It correlates well against my other devices with the exception of the dynamic range. I've done some through tests and then hooked up a reflection bridge. Normally I would do an OSL and then put the VNA in reflection mode. But I can't seem to understand how to do the equivalent on the nano or maybe I'm missing something? I assume it can do reflection using a bridge, no?

I looked around and I saw conflicting ways of attaching the bridge. One person wrote that the input of the bridge would be attached to the receive channel. That I don't understand at all as with my other devices, I transmit a signal to the input port and use the bridge output on the receive port of the VNA. Then depending on if the bridge has a reference port or not, I would do the OSL on the load port with the correct resistance on the reference port (again assuming the bridge has one).

But no matter what I tried, I only ever saw SWR up to about 1.5 to one even with the bridge DUT port open.

Anyway, I must be missing something simple. Please post a link or maybe I'm just confused??

Thanks,

Jerry

There is a return loss bridge inside the NanoVNA on port 0. I'm not sure if the NanoVNA supports external bridges. Maybe some of the PC software tools?

Op 26-2-2020 om 08:55 schreef Jerry:

Hi all,

here is a previous topic about using an external bridge with NanoVNA:
/g/nanovna-users/topic/64426024#8601

Ady YO2NAA


On Wed, Feb 26, 2020 at 10:24 AM Reinier Gerritsen <
r.gerritsen@...> wrote:

There is a return loss bridge inside the NanoVNA on port 0. I'm not sure
if the NanoVNA supports external bridges. Maybe some of the PC software
tools?

Op 26-2-2020 om 08:55 schreef Jerry:

Hello, all. Cool device to say the least.

I have a number of VNAs as well as scalar analyzers. I just picked up a

nano as my brother was interested and I thought we would explore it
together. It correlates well against my other devices with the exception
of the dynamic range. I've done some through tests and then hooked up a
reflection bridge. Normally I would do an OSL and then put the VNA in
reflection mode. But I can't seem to understand how to do the equivalent
on the nano or maybe I'm missing something? I assume it can do reflection
using a bridge, no?

I looked around and I saw conflicting ways of attaching the bridge. One

person wrote that the input of the bridge would be attached to the receive
channel. That I don't understand at all as with my other devices, I
transmit a signal to the input port and use the bridge output on the
receive port of the VNA. Then depending on if the bridge has a reference
port or not, I would do the OSL on the load port with the correct
resistance on the reference port (again assuming the bridge has one).

But no matter what I tried, I only ever saw SWR up to about 1.5 to one

even with the bridge DUT port open.

Anyway, I must be missing something simple. Please post a link or maybe

I'm just confused??

Thanks,

Jerry

The nanoVNA embedded SW can not work with an external bridge
There is currently no easy to use PC SW to use the nanoVNA with an external bridge although it is possible as you can get raw complex data from reference receiver and both port receivers.
--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

there is a return loss bridge inside the NanoVNA on port 0. I'm not sure if the NanoVNA supports external bridges. Maybe some of the PC software tools?

OK, thanks, this makes much more sense.

But then I saw people talking about using one of those cheap green balun-type bridges with the nano so what’s that all about?

thanks again, this was driving me crazy,

Jerry

On Feb 26, 2020, at 12:24 AM, Reinier Gerritsen <r.gerritsen@... <mailto:r.gerritsen@...>> wrote:

There is a return loss bridge inside the NanoVNA on port 0. I'm not sure if the NanoVNA supports external bridges. Maybe some of the PC software tools?

Op 26-2-2020 om 08:55 schreef Jerry:

Hello, all. Cool device to say the least.

I have a number of VNAs as well as scalar analyzers. I just picked up a nano as my brother was interested and I thought we would explore it together. It correlates well against my other devices with the exception of the dynamic range. I've done some through tests and then hooked up a reflection bridge. Normally I would do an OSL and then put the VNA in reflection mode. But I can't seem to understand how to do the equivalent on the nano or maybe I'm missing something? I assume it can do reflection using a bridge, no?

I looked around and I saw conflicting ways of attaching the bridge. One person wrote that the input of the bridge would be attached to the receive channel. That I don't understand at all as with my other devices, I transmit a signal to the input port and use the bridge output on the receive port of the VNA. Then depending on if the bridge has a reference port or not, I would do the OSL on the load port with the correct resistance on the reference port (again assuming the bridge has one).

But no matter what I tried, I only ever saw SWR up to about 1.5 to one even with the bridge DUT port open.

Anyway, I must be missing something simple. Please post a link or maybe I'm just confused??

Thanks,

Jerry