Between 1935-1950, telephone companies made extensive use of shortwave long distance telephone. All of this was done using single sideband, just like on the wired circuits. Read more
Shortwave Long Distance Telephone
Tag: SWL
Fix Monitor RFI in your Radio Shack
Here are some tips you can use to fix monitor RFI in your radio room. I hope these will work for you. Read more
Radio Spectrum Processor – Good Name for SDRPlay
Radio Spectrum Processor is a good name for the SDRPlay boxes. Because they are not your normal kind of radio. Read more
Mirics MSi3101 Chipset – Heart of SDRPlay
The Mirics MSi3101 Chipset is the heart of SDRPlay RSP. It’s hard to believe that two chips the size of a fingernail produce such powerful radios. Read more
RSP2 First Impressions – New Radio
Guess what showed up in my shack? I couldn’t resist. Here are my SDRPlay RSP2 first impressions. And they are very good. Read more
Heathkit Remembered – Original Radio DIY Company
Heathkit remembered as a fifty year history of quality equipment you could build yourself. Even I managed to build a few. Read more
Wireless Direction Finding – Early SIGINT
Long before radar and satellites, we tracked enemy movements with wireless direction finding. This early form of Signals Intelligence got its start in World War One. Read more
Wireless Air Force – Radio Takes Flight
Wireless Air Force in WWI was mainly about observation and reconnaissance for ground forces. It also marked the start of what we now call Air Traffic Control. Read more
Wireless Army Takes Shape – Out of the Trenches
Wireless army took shape during World War I. It provided mobility and flexibility for command and control, and technical advances for the radio age. Read more
Wireless Navy – Floating Antennas and Sparks
The wireless navy arrived with the twentieth century. Navies around the world provided much of the leadership for the invention, adoption and use of HF radio communication. Read more