I have never seen anything on 175 kHz. My questions for you to help us help you are:1. Is this a straight carrier or is there some digital or analog modulation on the carrier?
2. When does it first appear WRT to your local sun? I.e., right at sunset or 3 hrs after sunset etc etc
3. When does it dissapear WRT you local sun?
4. How long does the carrier stay visible once you start seeing it?
5. Is the carrier rock steady with absolutely no drifting around ?
73 Gedas W8BYA