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| To: | [email protected] |
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| Subject: | LF: WSPR reports |
| From: | Andy Talbot <[email protected]> |
| Date: | Sun, 23 Jan 2011 14:53:19 +0000 |
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G8HUH, monitoring WSPR...
Your reports on Jim and myself seem to indicate an abnormally high S/N
Are you in a very quiet location, or do you have a narrow CW filter selected?
If the latter, WSPR reports are only valid when the input noise spectrum is absolutely flat over the 1400 - 1600Hz audio input range.
If the bandwidth is any lower than 250Hz, S/N values become inflated as the WSPR decoding software cannot evaluate the full band of noise
Andy
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