Antenna analyser

Have an idea? Post it here! - Looking for developers? Ask here as well!
Post Reply
Drachenfrucht
Posts: 34
Joined: Fri Mar 18, 2016 12:18 am

Re: Antenna analyser

Post by Drachenfrucht » Fri Oct 27, 2017 7:10 pm

I have a question:

when we use Pavels' VNA application which jumper setting should we set at IN1 port ? The default setting is LV (LowVoltage). There is also the option to use HV (HighVoltage) or even jumper settings 2-5 to bypass the attenuator.

Should one use LV or 2-5 jumper setting to bypass the attenuator? What is best and suggested ?

Drachenfrucht
Posts: 34
Joined: Fri Mar 18, 2016 12:18 am

Re: Antenna analyser

Post by Drachenfrucht » Sat Nov 04, 2017 9:01 pm

noone?

sq3rx
Posts: 4
Joined: Thu May 17, 2018 9:45 am

Re: Antenna analyser

Post by sq3rx » Thu May 17, 2018 9:47 am

Can anyone suggest jumper position during VNA operation ?

pavel
Posts: 531
Joined: Sat May 23, 2015 5:22 pm

Re: Antenna analyser

Post by pavel » Thu May 17, 2018 10:49 am

sq3rx wrote:
Thu May 17, 2018 9:47 am
Can anyone suggest jumper position during VNA operation ?
The LV position should be OK.

sq3rx
Posts: 4
Joined: Thu May 17, 2018 9:45 am

Re: Antenna analyser

Post by sq3rx » Thu May 17, 2018 11:48 am

I am wondering is it safe to use it with baypass. :idea:
I use RP as skimmer serwer with metal case, so open it every time when I need to use vna is difficult.
Or maybe I can change default VNA port for IN2 ?

pavel
Posts: 531
Joined: Sat May 23, 2015 5:22 pm

Re: Antenna analyser

Post by pavel » Thu May 17, 2018 11:54 am

sq3rx wrote:
Thu May 17, 2018 11:48 am
I am wondering is it safe to use it with baypass.
It should be safe if you set Level to -12 or -18 dB. Adding an attenuator to OUT1 could be also a solution.

narrowstats
Posts: 1
Joined: Fri Oct 05, 2018 1:45 pm

Re: Antenna analyser

Post by narrowstats » Sat Oct 06, 2018 9:19 am

DeGaCo wrote:
Wed Apr 29, 2015 6:46 am
You need a directional coupler to get the reflected power than you can measure the reflection coefficent and calculate the VSWR. In this frequency range up to 30MHz I am not sure that a calibration is necessary. It is dependet on the quality of the coupler.
The problem with coupler is the limited bandwith. A transformator will cover the range 1MHz - 30MHz.

For a vector network analyser look at

You need two switch, two power splitter and two directional coupler. Because the RP has only two inputs the second switch will connect successive the signals to the input ports. To compensate the influence of the components a calibration will be necessary.

Thanks for the link.

sq3rx
Posts: 4
Joined: Thu May 17, 2018 9:45 am

Re: Antenna analyser

Post by sq3rx » Sat Oct 20, 2018 7:30 am

Sorry for trivial question, but I am not an expert in vna measurment...
Is it possible to measure insertion loss of antenna switch using RP VNA ? How should I connect antenna switch ?
Thanks for any advice

dk5hh
Posts: 2
Joined: Wed Mar 02, 2016 6:45 pm

Re: Antenna analyser

Post by dk5hh » Tue Oct 30, 2018 9:39 pm

Hello list,
as I know, the VNAcode at the moment is designed as a 1-port measurement. -- From my point of view this is a a solid pythonic code. An excellent work by Pavel!

But it can be extended for two port measurement, if someone will take the opportunity to add this function to the code.

A cable 1-port return loss measurement opens the view on the cable losses (through- measurements).

cable loss := return loss / 2

may be, this helps for now!
Michael, DK5HH

sq3rx
Posts: 4
Joined: Thu May 17, 2018 9:45 am

Re: Antenna analyser

Post by sq3rx » Thu Nov 01, 2018 11:53 am

Hi Michael,
Thanks for explanation. I think it could be great addition to VNA software.
On github there is currently active topic "Use the VNA app for output power measurement not just".
https://github.com/pavel-demin/red-pita ... issues/772
I think it is quite similar to your idea. Isn't it ?
Maybe you can check this one and add your comment ?
73! Mek SQ3RX

Post Reply
jadalnie klasyczne ekskluzywne meble wypoczynkowe do salonu ekskluzywne meble tapicerowane ekskluzywne meble do sypialni ekskluzywne meble włoskie

Who is online

Users browsing this forum: No registered users and 3 guests