HF Radio Interference
This is a typical jamming signal and impossible to hear any DX when this one is around. The picture shows a signal on the fourth vertical bar. It is assumed that this is the target to be jammed. There are current trends for this kind of signal to momentary block out selective amateur DX stations.
OTHR Enemy number one again. This is a high resolution display showing tones at 100 Hz intervals. At times it is possible to receive several of these transmission on different beam heading. Some have tone spacing of 50 Hz. and a slightly distinguishable repetitions rate.
OTHR with 50 Hz spacing. All OTHR have extremely wide RF bandwidth covering tens of Mhz