Amateur radio 40m ssb contest sdr view

What is Hellschreiber. Hellschreiber is a German name, meaning "bright writing", or "clear writing". Hellschreiber is anything but a new mode. It was first patented in 1929 which makes it the oldest machine generated data transmission mode used in amateur radio. To put this in perspective, SSB...

2008 W2RE finished a 4 month antenna project that swapped out antennas and added antennas to maximize gain using HFTA. The new antennas and stacks will maximize gain with the guide of the HFTA (N6BV) software.

Tube radio with 4 tubes, experimental, schematic comes later.

The Russian R161 radio station - Movie by G4PYM - full version

Telephone and telegraph from the Your Life work series - 1946 - Vocational Guidance Films, Inc.

Special event station from Fort McCalister Georgia working 20 mtrs on 3 Jan 09

Using Winrad we look at the activity corner of the display. The Softrock v6.1 is on 40m an MT63 or another multitone mode is on the left 4 PSK31 contacts on the right take up less space.

Rocky software decoding BPSK31 on 40m from Sofrock TX/RX v6.1. Improved video quality.

Schematic of the 4 tube radio, experimentally built in a way of the radio-pioneers (1910-1945). The radio acts as a cascade type receiver when the antenna coil has a high self-inductance, with lower self-inductances of the antenna coil you can put in a mixing process with the oscillator. Perhaps...