In March 2018 I started an experiment to measure the QRP NVIS beacon on 80 meter band from PA0RYL
Some data of the beacon
I wanted to measure the signal to noise ratio and tried to search for ways to get this done.
I found some software from G4JNT for this but after a while I
found that with the very low S/N ratio
I was using a Perseus receiver for receiving the beacon and I
found the function Mkrlog which generates a logfile of the selected markers.
With the marker.log file I have the measurements from the beacon available.
I have put a marker on the beacon, and a few markers around the signal to measure the noise level.
The data is then used in Excel to create a graphic picture of
I measure each 5 seconds the power level received at 3
During a 24 hour period I make 17.280 measurements.
The beacon on my Perseus screen
The receive antenna is at my home QTH in Haselunne, Germany; locator JO32sq
For receive I use an partial home made active loop antenna,
The amplifier is designed and build by LZ1AQ : http://active-antenna.eu/
I started the measurements using a Resolution Bandwidth of 1
Hz, later I increased this to 1,9 Hz because the beacon fell of the marker,
probably my receiver frequency drifted due to temperature drift. Some days after
I decreased it to 0,5 Hz, the lowest RBW that can be selected in the Perseus
software I use.
If you read this, please do not transmit on the frequency of the beacon because it will influence the measurements.
The first result looked like this, it is a measurement from 27-3-2018 from 18 UTC until 21.36 UTC
The same measurement but then with small dot's
Here I added a trendline, giving an average of 100 measurements
This will be the format how I want to publish my measuring results
For the results of my measurements take a look at the page: 29-3 t/m 30-4