Decode KAVB with an SDR

Group

KA family (own modes)

In the mode list

KAVB, 1-2 MHz video

What KAVB is

KAVB: the video mode of the KAAL family, 1 to 2 MHz wide (700 to 1400 ksym/s single carrier, 16-QAM and 64-QAM with LDPC, a sweep signature, video, audio and data packets in FEC groups). Receive finds the frames and lists the packets with the link numbers and a constellation, counts the payload bytes and can save them to a file; there is no AV1 or Opus decoder in this build, so no picture or….

Frequencies and settings

OnAir takes any frequency you type; the numbers above are the mode's starting point and the range its table describes. In the app the shortcut label is KAVB, 1-2 MHz video.

What OnAir shows

KAVB: the video mode of the KAAL family, 1 to 2 MHz wide (700 to 1400 ksym/s single carrier, 16-QAM and 64-QAM with LDPC, a sweep signature, video, audio and data packets in FEC groups). Receive finds the frames and lists the packets with the link numbers and a constellation, counts the payload bytes and can save them to a file; there is no AV1 or Opus decoder in this build, so no picture or sound is shown. Transmit sends a file of bytes or a synthetic test stream, to a radio or an IQ file.

Limits and what it was checked with

Checked with generated signals and impairments; recordings of real signals welcome.

Which radio you need

Any radio that tunes this range works. An RTL-SDR covers roughly 24 MHz to 1.7 GHz, and every other radio in the radio guide reaches it too. Antenna height and a clear view of the transmitter matter most.

Receiving and the law

Questions about KAVB

More in KA family (own modes)