Talk:FT8

What tools (hardware & software) were used to create the image of the FT8 signal (more specifically FT8.png)?

The main page states: "Most signals are received and recorded using a software defined radio such as the RTL-SDR, Airspy, SDRPlay, HackRF, BladeRF, Funcube Dongle, USRP or others." But the resolution, in both the time and frequency axes shown in FT8.png, is higher by perhaps an order of magnitude than what I've seen with either WSJT-X or SDRplay. I'm guessing this was done with some kind of lab equipment, but please point me in the right direction if this level of detail is available via common SDR software. I'd love to observe my Tx signal at this resolution.

Forgive me if answered elsewhere, but I didn't see anywhere after a quick look around.

Thanks in advance, 73, Bennett WB5GVY

I guess the showcase sample was recorded directly from WSJT-X and visualized with a spectrum analysis tool or an SDR software that allows audio input. Or it could be a recording from a nearby transmitter. Emcbro (talk) 22:18, 30 September 2024 (NZDT)

Is the audio recording a real FT8 codeword? The Sync sequences are reversed (it should be 3140652 but it is 2560413 and i don't get the LDPC or CRC to lock. I guess, it is simulated poorly just for "audio reference", isn't it? And the 20m band audio sample is a wav with stereo at 44100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). according to file header, but timing indicates it is actually sampled with 31250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).. I guess, this is a bug in some software tool... - Gereon Such, https://suchdsp.com