RaDAR – WSPR our propagation tool

I had built the QRP Labs U3S WSPR transmitter and expanded it for two bands namely 40m and 20m. My interest is 40m as most of my RaDAR operaions take place locally although during the challenges it’s always good to cross the oceans and access other continents and make contact with other RaDAR operators around the world.

For quite some time (A few weeks) I have been WSPR’ing from my RaDAR playground in KG34ac but I started to get irritated by the slight QRM I was experiencing on my CCTV cameras which I use as “The poor man’s trail camera”. Seeing my grandson was returning to school after almost a year attending on line schooling due to Covid-19 my wife and Eduan had to go back to town in Lichtenburg and only join me on weekends again. I had to do a few chores there yesterday and took the U3S into town and set it up there. I had built a trap dipole for the purpose and got it up at about five meters above ground in an inverted vee format. The antenna was fed with a length of RG215, better than it was here at home.

I had to update my 6 character TX grid to KG33bu on the WSPR database after I found it was only registering 4 characters on the WSPR database. I had conflicts with duplicate call signs in different locations so the RX side I renamed to ZS6BNE/p which is what it is actually. I use a RF Space SDR-IQ SDR running on its software typically Spectravue. I use a virtual audio cable (Software) to channel the audio to WSJT-X running in WSPR mode. Here too I have an inverted vee on 40m for reception. My main concern obviously is 40m.

This opened up some interesting facilities. ZS6BNE TX in KG33bu and around 30 km away as the crow flies the ZS6BNE/p RX in KG34ac. This is my own NVIS alert / testing facility and has already shown some interesting results!

As suggested by a friend on our local WSPR WhatsApp group I use http://wsprd.vk7jj.com/ to do queries on the WSPR data. From this data I intend pulling it into Libre-Calc and drawing graphs from the results. Here you can clearly see a NVIS opening and to prove it I made contact with Andy ZS6ADY who is usually skip to me!

I’m looking forward to those graphs and seeing the interesting results!

73 de Eddie ZS6BNE

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s