Ham digital image (HamDRM / digital SSTV)
Pictures and files sent by hams using a DRM-style digital signal instead of analog SSTV.
ModeHam digital image
FamilyRadio signal
Audio example10.0 s
What does it sound like?
Plate 23Radio signal
A steady, narrow block of hiss, a few seconds to minutes long.
0 Hz1,0002,0003,000 Hz
10.0-second example. A demonstration made with the free QSSTV program (Internet Archive, CC0); on the air it sounds noisier.
Field marksMany tones side by side (OFDM)About 2.5 kHz wideCarries pictures and files
Who uses it?
Amateur radio operators.
Where and when can I hear it?
Ham bands, often near the SSTV frequencies (for example around 14.230 MHz).