Decode ARDOP with an SDR

Group

Amateur: digital

In the mode list

Winlink HF, 14.103 MHz

What ARDOP is

ARDOP (Amateur Radio Digital Open Protocol, the HF modem of Winlink) frames on 200, 500, 1000 and 2000 Hz channels, monitor only: the two-tone leader and the 4FSK frame type of every frame, connect requests, IDs and pings with call signs and grid square, ACK / NAK quality, and the data of the 4FSK frames that pass their CRC; PSK and QAM data frames are listed by header.

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 Winlink HF, 14.103 MHz.

What OnAir shows

ARDOP (Amateur Radio Digital Open Protocol, the HF modem of Winlink) frames on 200, 500, 1000 and 2000 Hz channels, monitor only: the two-tone leader and the 4FSK frame type of every frame, connect requests, IDs and pings with call signs and grid square, ACK / NAK quality, and the data of the 4FSK frames that pass their CRC; PSK and QAM data frames are listed by header.

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 ARDOP

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