During Friday evening (when the noise was definitely there) I analysed it to the best of my ability. It appears to start around 400 kHz, and above 4 MHz it's not noticeable. It has its peaks and nulls as can be seen from the 4 MHz DDC spectrum below but they are not completely evenly distributed. What was really quite surprising was that when I engaged the G33DDCs Noise Blanker, it all but removed the noise. Alas, the Perseus NB is much less effective so unless I'm able to remove the source, the G33DDC is the only SDR I can use with the 50 degrees beverage.
|Noise floor when disturbed. Vertical lines are "proper" signals.|
The 310 degreees beverage was erected in beautiful late summer weather yesterday and works as expected. The hope for early trans-atlantic signals was shattered by two M-class flares yesterday evening followed by a proton event.
The dual-340 beverage will wait until OJ Sagdahl comes around in early September.