SAQ transmission of October 24th, 2018

by Alberto I2PHD                                  

SAQ reception of October 24th, 2018 done by Alberto I2PHD in JN45sl, using the Airspy HF+ SDR receiver.

The audio of the transmission can be heard here

The Airspy HF+ was fed from a mini whip antenna, made by Roelof PA0RDT, with a low pass filter to
clean the band, as shown in this photo.
Inside the low pass box there is also a galvanic insulator. The Airspy is modified, the R3 capacitor
is paralleled with a 100nF one.

This is the schematic of the low pass filter :

And this is its Bode plot, as computed by LTSpice :

73  Alberto  I2PHD