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Si5351 Network Analyzer Lite
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Author:  vu2upx [ 23 Sep 2018, 20:31 ]
Post subject:  Si5351 Network Analyzer Lite

Hello Andrey,

I built this project and ran the latest software for NWT and it does not work. Whatever I do, I am just getting a straight line.

Please help.

Also , please incorporate a Stop button after you give a RUN command. The program hangs when you give a run command with a long Sample read.

vu2upx

Author:  Relayer [ 23 Sep 2018, 21:29 ]
Post subject:  Re: Si5351 Network Analyzer Lite

Hi,

1st check crystal freq in NWT.ino. It must be equal to used crystal. Also note that you need calibrate device before measurement

Author:  vu2upx [ 24 Sep 2018, 00:05 ]
Post subject:  Re: Si5351 Network Analyzer Lite

Relayer wrote:
Hi,

1st check crystal freq in NWT.ino. It must be equal to used crystal. Also note that you need calibrate device before measurement


I did check the Crystal Frequency, its OK.

For Calibration I just shorted the Signal out with Singnal In and still a clean straight line.

I also simply ran the Run command on a out of board NaNo and still a straight Line.

which is the latest ino file for NWT Lite ?

Thank you for the reply

Author:  Relayer [ 24 Sep 2018, 20:59 ]
Post subject:  Re: Si5351 Network Analyzer Lite

Latest ino file in firsp post of this topic. I haven't idea why NWT isn't working. If you have oscilloscope you can doing next:
1. connect in to out
2. run Arduino IDE. open COM-port monitor. select baud rate 115200.
3. close and open com-port monitor again. NWT reply firmware version
4. enter command
f3000000<enter>
5. check that 3MHz freq found on the output
6. check that aftre ceramic filter found sin wave with freq equal to center of IF filter
7. check same freq after 2nd IF filter
8. check voltage at output of AD8307. it must be approx 2-2.2v

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