Tuesday, May 19, 2020
What WSPR signal to noise ratio is needed for sideband to be intelligible?
Over a 24 hour period, with him transmitting just 10mW, the best SNR was -21dB here.
My question, to the brains trust hopefully reading, is what WSPR signal to noise ratio would be enough such that a higher power sideband call would be audible?
I have read that a signal to noise ratio of 6dB is needed to be able to copy SSB.
John is transmitting 10mW which is 10dBm but he could run 100W on sideband or 50dBm. An extra 40dB.
If the bandwidths were the same then -21dB + 40dB = 19dB of signal to noise but while SSB is about 2.5kHz wide, WSPR is much narrower, perhaps only a few Hz?
Here is the SNR between VK2ASU and VK2TPM (portable VK3).
Spots from all stations to me looks like this:
Any insights or pointers gratefully received.