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.
Re: Central Electronics 100V Opposite Sideband Supression Adjustment
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Thanks for the advice Roger. I’ve dialed it in as best I could using a
Wandell and Goltermann AT-611 selective level meter to look at and listen
to the re...
3 hours ago