Use the filter and Attenuator to test the VNA(Track scope) function in Antenna Analyzer
I have measured the performance of the S2 port added to the EU1KY Antenna Analyzer.
1.Introduction - http://www.hamskey.com/2019/02/faa-450-antenna-analyzer-eu1ky.html
1.Comparison of measurement results between commercial instrument and AA for filter
1.1 45.1 Mhz
I used a filter on a Motorola radio.
The filter is attached to the socket.
Measurement result of AA
Testing on a Spectrum Analyzer with signal generator
Measurement result of Spectrum Analyzer with signal generator
The characteristics of the filter are similar to each other when viewed with AA and a commercial instrument.
1.2 50.1 Mhz
50.1Mhz Filter from YAESU FM transceiver.
Measurement result of AA
Measurement result of Spectrum Analyzer with signal generator
Video
2.Attenuator
I used the attenuator to check the measuring range.
Connect the attenuator to S1 and S2.
Calibration
I set the range from 1 to 100 MHz.
0dB
-5dB
The measurement result indicates -5dB.
-10dB
The measurement result indicates -5dB.
-25 dB
It is -25dB which starts the problem at 80Mhz or higher.
I recommend that the filter test be done at 70Mhz or less.
When measuring within -25dB, all frequencies are available.
I changed the frequency range from 1 to 40 MHz.
-50dB
Measurement is possible up to -50dB, Most filter measurements are possible with -50dB.
-60dB (The maximum value of my attenuator)
Measurement is not possible up to -60dB.
Video
3.conclusion
Maybe if you have a more sensitive attenuator, the range you can use can be measured even wider.
If you measure up to -25dB, you can use it at most frequencies. If you make a filter of 60Mhz or less, you can measure up to -50dB.
I have measured the performance of the S2 port added to the EU1KY Antenna Analyzer.
1.Introduction - http://www.hamskey.com/2019/02/faa-450-antenna-analyzer-eu1ky.html
2.Create FAA-450 - http://www.hamskey.com/2019/02/assembling-faa-450-antenna.html
3.How to update the Firmware - http://www.hamskey.com/2019/02/3-antenna-analyzereu1ky-how-to-update.html
4.How to Setup and Calibration - http://www.hamskey.com/2019/02/4-antenna-analyzereu1ky-how-to-setup.html
5.Antenna Analyzer Firmware Improvement http://www.hamskey.com/2019/02/release-firmware-cec-version-01-for.html
6.Antenna Analyzer VNA(Track scope) Test (this article)
1.1 45.1 Mhz
I used a filter on a Motorola radio.
The filter is attached to the socket.
Measurement result of AA
Testing on a Spectrum Analyzer with signal generator
Measurement result of Spectrum Analyzer with signal generator
The characteristics of the filter are similar to each other when viewed with AA and a commercial instrument.
1.2 50.1 Mhz
50.1Mhz Filter from YAESU FM transceiver.
Measurement result of AA
Measurement result of Spectrum Analyzer with signal generator
Video
2.Attenuator
I used the attenuator to check the measuring range.
Connect the attenuator to S1 and S2.
Calibration
I set the range from 1 to 100 MHz.
0dB
-5dB
The measurement result indicates -5dB.
-10dB
The measurement result indicates -5dB.
-25 dB
It is -25dB which starts the problem at 80Mhz or higher.
I recommend that the filter test be done at 70Mhz or less.
When measuring within -25dB, all frequencies are available.
I changed the frequency range from 1 to 40 MHz.
-50dB
Measurement is possible up to -50dB, Most filter measurements are possible with -50dB.
-60dB (The maximum value of my attenuator)
Measurement is not possible up to -60dB.
Video
3.conclusion
Maybe if you have a more sensitive attenuator, the range you can use can be measured even wider.
If you measure up to -25dB, you can use it at most frequencies. If you make a filter of 60Mhz or less, you can measure up to -50dB.
HELLO IAN
ReplyDeleteit will be nice if you can make cursor vertical lines right and left if you determinat the filter bandwith so that you can set bouth lines left or right
but in all good job nice .
regards vojko
de S52E
Thank you for your good opnion.
DeleteMaybe it would be good to compare dB. I will put the feature in the next version.
Ian KD8CEC
You have been busy Ian!
ReplyDeleteIt looks excellent. I will definitely be doing the transmitter mod on my EU1KY in the near future.
73
Gerry / EI8DRB
I can learn a lot from your post. Keep us updated! concrete masonry construction San Antonio TX
ReplyDelete