OnAirDecode IFKP with an SDR
IFKP: keyboard chat on 33 tones, three speeds.
- Group
- Amateur: digital
- In the mode list
- Keyboard chat, 14.083 MHz
What IFKP is
IFKP (Incremental Frequency Keying Plus) keyboard chat: 33 tones, speeds 0.5, 1.0 and 2.0 found automatically, 14.083 MHz.
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 Keyboard chat, 14.083 MHz.
What OnAir shows
IFKP (Incremental Frequency Keying Plus) keyboard chat: 33 tones, speeds 0.5, 1.0 and 2.0 found automatically, 14.083 MHz.
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 IFKP
Can I decode IFKP with an RTL-SDR?
An RTL-SDR can receive HF only in direct-sampling mode, which OnAir offers in its radio settings; results depend on the antenna. SDRplay and Airspy HF+ radios are better suited.
Is it legal to receive IFKP?
Amateur radio signals are meant to be received. Receiving needs no licence in most countries; OnAir does not transmit.
Can I try IFKP in OnAir without a radio?
Yes. Most modes include a built-in synthetic test signal, so you can open the screen and try the controls before you own a radio.