I started playing with the RTL SDR dongles again. I wanted to use them to confirm that my BITX signal is NOT 9 kc wide (it is not). I also wanted to try to confirm the aircraft band frequencies in use in this area.
So I got the HDSDR software running and plugged in the dongle that I had modified for HF use. It worked great, but I could see (literally SEE) that it needed some bandpass filtering and perhaps a bit of RF gain. So today I threw together this device. Dual gate MOSFET (gates tied together) with an LC filter on the gate. Power from Malaysia via the 9V battery.
It works great. It was fun to add a bit of homebrew to an otherwise soul-less commercial receiver. But beware: that waterfall is addictive, even for a hardcore Hardware Defined Radio guy like me.
5000km+ TEP opening on the 432 MHz band in the Indian Ocean - 23rd Apr 2024
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Back on the 8th of April 2024, I reported on the very first
Trans-Equatorial Propagation (TEP) opening on the 144 MHz band from UAE to
Reunion Island in...
2 minutes ago