Decode KAIT with an SDR

Group

KA family (own modes)

In the mode list

KAIT, 190 kHz pictures

What KAIT is

KAIT: a 1080p picture in a 10 s burst, 190 kHz wide, coded in layers (a coarse picture first in the most robust coding, then more detail): the picture a receiver shows is what its link decodes, from an outline at -12 dB to the full picture above 8 dB. Receive shows the picture growing layer by layer with the callsign and the link numbers; transmit takes a PNG or PPM picture (or a demo picture)….

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 KAIT, 190 kHz pictures.

What OnAir shows

KAIT: a 1080p picture in a 10 s burst, 190 kHz wide, coded in layers (a coarse picture first in the most robust coding, then more detail): the picture a receiver shows is what its link decodes, from an outline at -12 dB to the full picture above 8 dB. Receive shows the picture growing layer by layer with the callsign and the link numbers; transmit takes a PNG or PPM picture (or a demo picture), 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

This is a shortwave mode, so the radio has to tune HF. An SDRplay, Airspy HF+ or an RTL-SDR in direct-sampling mode do that directly; with a HackRF an HF upconverter or a direct-sampling receiver is the usual route. A long wire or loop antenna matters more than the radio.

Receiving and the law

Questions about KAIT

More in KA family (own modes)