DMR – Welcome to the dark side

Back in 2003 i obtained my full licence. Around this time Digital radio was starting to get a grip on the hobby, however at this point i resisted. Now i have always been the traditionalist, i like the old fashioned way of making contact with people, aerials, analogue radios you name it. I got myself … Read more DMR – Welcome to the dark side

Build a small space HF Antenna

A number of people within our hobby have restrictions on antenna placement for a number of reasons. Maybe our gardens are too small, maybe there are planning restrictions. Whatever the reasons most of us who fit into this category are always looking for an antenna to get us out there. We will never match the … Read more Build a small space HF Antenna

Build a 4:1 UnUn

Bifilar toroid

What is an UnUn ? Unbalanced to unbalanced- simple? An unun is an impedance transformer, usually 4:1 or 9:1, that will match an unbalanced antenna to a feed line. To buy or not to buy ? The question was “ Do I pay £35+ for a ready made unit, or do I make it myself?” I have taken … Read more Build a 4:1 UnUn

Build a USB battery pack keep-alive load

Another very easy construction project, from the team at Sotabeams. For once though, I actually needed this item rather than the usual, “Wanted it”. So what’s the problem ? This is a basic “Tea break” project that serves a purpose for those who use power/battery banks. Powerbanks can be used with WSPRLITE units that have … Read more Build a USB battery pack keep-alive load

Build a Raspberry PI ADS-B SDR Aircraft Receiver/Feed

What is ADS-B Automatic, Dependant, Surveilance – Broadcast ADS-B is a system in which electronic equipment onboard an aircraft automatically broadcasts the precise location of the aircraft via a digital data link. The data is used by other aircraft and air traffic control to show the aircraft’s position and altitude on display screens without the … Read more Build a Raspberry PI ADS-B SDR Aircraft Receiver/Feed

Build a Wspr lite classic low pass filter assembly

As you will know from other posts, I have recently purchased the Sotabeams WSPR Lite classic low power antenna testing unit. This unit, in its its bare back form allows testing on the 20mtr and 30mtr bands without filters, however if you wish to explore antenna usage on 40, 80 & 160mtrs you will need … Read more Build a Wspr lite classic low pass filter assembly