Lowest WSPR Signal

WSPR discussion

Lowest WSPR Signal

Postby VK2XTC » Mon Mar 21, 2016 9:46 pm

What is the limit for a WSPR decode ?

This is the lowest signal strength I have seen.

Tonight on 30M. (-30dB) Amazing !!

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1032 -30 -0.5 10.140207 0 JQ2WDO PM95 37

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Brian

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Re: Lowest WSPR Signal

Postby VK3KCX » Tue Mar 22, 2016 5:01 am

You can sort the entire database by SNR, plenty of -33 decodes.

Database

Specify query parameters

50 spots:
Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
2016-03-20 19:04 GM1MSS 7.040137 -33 1 IO85 0.2 DL0HT JO43jb 813 104
2016-03-20 19:04 K4EH 14.097108 -33 0 EM73qk 5 KE7BJB FN42iu 1564 44
2016-03-20 19:04 G3YFG 7.040093 -33 0 IO83tu 0.2 PE2HD JO21rl 590 113
2016-03-20 19:10 G7EOB 10.140178 -33 1 IO91tr 1 EA8BVP IL28fd 2910 212
2016-03-20 19:16 DF8AV 14.097154 -33 0 JO51am 0.2 EB5DQ IM99tp 1546 215
2016-03-20 19:16 W3SMK 14.097143 -33 0 CM87xq 5 AB8EF EN63vb 3069 67
2016-03-20 19:18 LZ0DLS 10.140286 -33 0 KN12 0.2 EA8BVP IL28fd 3798 258
2016-03-20 19:18 XP1FNV 14.097188 -33 0 LB12 5 N5CEY EL16gq 14007 225
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Re: Lowest WSPR Signal

Postby VK2EFM » Tue Mar 22, 2016 12:40 pm

I suspect the SNR is averaged over the whole transmission period.
So if the received signal is strong enough for long enough to be decoded and then reduces in strength for the rest of the transmission, you can get SNRs below -28dB.
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