Hi all,
Soldersmoke's blog has a post today with the recording I made just after 2300 UTC on 2021-12-11 of 1BCG's replica transmitter sending their 100th Transatlantic Test Anniversary commemorative signal on 160 meters:
Links there lead you as well to the 1BCG page with details of their replica transmitter. I was fortunate to catch it on the very first transmission when everything went well, before their RF choke broke down and somewhat scrambled their ambitions of repeating it every 15 minutes.
Gear = simple 80/40/20 fan dipole from grid FN42dk here in Massachusetts, feeding a KiwiSDR.
You might enjoy listening to the linked WAV file to hear what a transmitter of the day sounded like. Lots of 'whooping'. Pete N6QW guessed that there was a huge amount of ripple on the DC causing that to happen, as was typical of the era. The spectrogram, from when they were tuning up, is entertaining - also notice how 'wide' the signal was in a local/narrowband sense, hence the chirping.
73