Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
22 May 2024
10m 500uW (0.5mW) WSPR (Wednesday)
My beacon has been on all day. No spots all day.
If I had good results on 6m FT8 with 10mW, I would have expected some Es spots with 500uW on 10m WSPR. Perhaps the 13dB difference takes signals into the noise floor?
I think there are two factors at play. First, as you say the 13dB difference, it's a valid one. The second has to do with timing. A signal in FT8 needs less than 15 seconds to decode, the WSPR signal about 2 minutes, and a signal via Es can come and go, be there for 15 seconds and be decoded in FT8, but there is not enough information decoded in WSPR. I experienced a similar difference when I switched from JT65 (1 minute periods and lower decode threshold), to FT8. On the higher bands I got much better decodes than with the longer periods.
Good luck, for now I have 6m and 8m FT8 decoding running when I am not away for more than a day (thunderstorms en give rise to a disconnect, though).
I think there are two factors at play.
ReplyDeleteFirst, as you say the 13dB difference, it's a valid one.
The second has to do with timing. A signal in FT8 needs less than 15 seconds to decode, the WSPR signal about 2 minutes, and a signal via Es can come and go, be there for 15 seconds and be decoded in FT8, but there is not enough information decoded in WSPR.
I experienced a similar difference when I switched from JT65 (1 minute periods and lower decode threshold), to FT8. On the higher bands I got much better decodes than with the longer periods.
Good luck, for now I have 6m and 8m FT8 decoding running when I am not away for more than a day (thunderstorms en give rise to a disconnect, though).
Vy 73 de Jan, OZ9QV