Intrigued by G experimenters on 500 kHz I rebuilt my multiturn loop for LW/MW. The first evening of reception I could pick PA0A at -30dB in the following conditions:

• indoor passive multiturn square loop approx. tuned to 500 kHz (25 turns, one full coupling loop, 1m each side)
• FT-817
• Asus eeePC (not relevant) with WSPR 2.0

I have S7-S8 constant noise. I couldn't receive any other ping the folliwing two nights. I will try to put the loop outside in the next days.

In the quest for a simple WSPR homebrew transmitter, I had to step through the process of generating WSPR without a computer.

My on-the-air transmission of last night (2009-04-06) has proven that it is possible. Given that a WSPR beacon emits a cyclic time-invariant signal, its sound can be pre-recorded and re-played endlessly with a simple MP3 player.