Much has been written about number stations over the years, although little is known for fact. We do know they often broadcast on a schedule, so with a little planning, it is quite easy to receive them for yourself. Online SDR receivers take this to a new level, and now with TDoA, we are able […]
Category: Blog
Using the KIWI for TDoA (Time Difference of Arrival)
Pirate radio stations around 6MHz have been using that part of the spectrum for many years. They often populate that part of the band, and in the main don’t seem to cause the primary users any issues. The primary users sometimes put a STANAG signal on top of the pirate music station, I doubt they […]
Solar Powered WSPR Transmitter
A while ago I completed the QRP labs WSPR transmitter, you can read about that project in this article. I wondered how easy it would be to set this up in the garden, solar and battery powered. The QRP labs unit transmits around 200mW, and the idea was to have this running 24×7 transmitting around […]
Resonant antenna tests on WSPR 472 KHz
At the SNBCG operating site we have the opportunity to out up some large antenna, and for some time we had wanted to try 472 KHz using George M1GEO WSPR transmitter. The plan was using the onsite 50m cellphone mast* to pull up some wire, and with some work hopefully, enough wire to have a […]
How good is that choke?
With field days just on the horizon, I decided to make a couple of Balun (common mode choke) for field day use. I often use a vertical for 7 or 3.5 MHz, and a 1:1 choke is needed to stop the feeder becoming part of the antenna system. Sure you can purchase them online, but […]
Summer 2018 has arrived (almost)
At last, the warmer weather has arrived, today gave me the first opportunity to operate outdoors without a coat. It was a pleasant sunny afternoon so I decided to operate outdoors and make the most of the nice weather. Using the Icom 7100 and 65Ah leisure battery and a white stick for 145 MHz and […]