Hello Paul, attached a view of the 2200 m WSPR band in JO20ix. The QRM is from DCF39. As you can see there are 2 small band with low QRM, one 1425-1450 Hz the other from 1550-1570 Hz (all audio frequ
Thank you Rik and Stefan. My understanding is: For WSPR-2, stay between 137.425 to 137.450 or 137.550 to 137.570. For WSPR-15, stay above 137.618. Rik, your screen capture was very enlightening. 73,
Hi Paul, Another capture is (up to date) on my grabber http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_LF_DX_Grabber.html The 3rd image shows the DCF-39 mess. You can see some dashes inbetween th