Thanks for the info, Tim. ON5KQ is one of our long-time RBN
contributors, with something like the reference configuration (QS1R
receiver, Skimmer Server 1.40.0.138, Aggregator 4.1). I wonder if maybe
he has a very close station on 160M or AM broadcast whose signal drives
his RX into clipping. I had to put in a high-pass filter here to control
the effects of an AM station on 1550 KHz, but only during daytime,
because at night it runs 6 watts(!).
The QS1R has no selectivity between the antenna and the ADC, other than
a low-pass filter. Measurement of SNR takes place at the instant that
CW Skimmer Server decides that it should spot a station, and normally
anomalous SNRs only result if another station is near zero-beat. but
with ADC clipping all bets are off.
73, Pete N4ZR
Download the new N1MM Logger+ at
<http://N1MM.hamdocs.com>. Check
out the Reverse Beacon Network at
<http://reversebeacon.net>, now
spotting RTTY activity worldwide.
For spots, please use your favorite
"retail" DX cluster.
On 9/17/2015 9:18 AM, Tim Shoppa wrote:
I felt conditions were really good to EU last night on 160M.
But look at these S/N numbers below that came from reversebeacon. I know
that due to measurement to measurement jitter that we have to reject
outliers.
There is a string of spots where me and other 3-landers are consistently
being spotted in EU with S/N in the 30-67 dB range.
I my experience anything above 50dB S/N, pretty much means a bonecrushing
local. This sort of consistent spotting S/N over a whole hour, is just
amazing if it was true.
The ON5KQ spots from 49dB to 67dB spots stand out as really strong, but at
same time, I worked so many small-gun ON's last night that I have never
heard on topband before, so maybe there was a supreme enhancement to
Belgium for most of that hour.
Tim N3QE
(Hope cut-and-paste job below survives E-mail)
DX continent: NA - North America / DE continent: EU - Europe / band: 160m
cancel filter selection / search spot by callsign
de dx freq cq/dx snr speed time
EA5WU NO3M 1824.7 CW CQ [LoTW] 15 dB 24 wpm 0541z 17 Sep
EA5WU NO3M 1824.7 CW CQ [LoTW] 27 dB 24 wpm 0520z 17 Sep
EA5WU N3QE 1821.6 CW CQ [LoTW] 7 dB 23 wpm 0517z 17 Sep
EA5WU W4DJL 1814.5 CW CQ [LoTW] 15 dB 17 wpm 0516z 17 Sep
GW8IZR NO3M 1824.7 CW CQ [LoTW] 12 dB 26 wpm 0510z 17 Sep
EA5WU NO3M 1824.7 CW CQ [LoTW] 17 dB 26 wpm 0510z 17 Sep
ON5KQ NO3M 1824.7 CW CQ [LoTW] 54 dB 26 wpm 0508z 17 Sep
GW8IZR NO3M 1824.7 CW CQ [LoTW] 23 dB 26 wpm 0508z 17 Sep
EA5WU N3QE 1821.6 CW CQ [LoTW] 16 dB 23 wpm 0506z 17 Sep
DF4UE NO3M 1824.7 CW CQ [LoTW] 3 dB 25 wpm 0506z 17 Sep
ON5KQ N3QE 1821.6 CW CQ [LoTW] 49 dB 23 wpm 0504z 17 Sep
GW8IZR W4DJL 1814.5 CW CQ [LoTW] 40 dB 17 wpm 0503z 17 Sep
EA5WU W4DJL 1814.5 CW CQ [LoTW] 31 dB 17 wpm 0503z 17 Sep
EA5WU NO3M 1824.7 CW CQ [LoTW] 22 dB 28 wpm 0500z 17 Sep
GW8IZR N3QE 1821.6 CW CQ [LoTW] 12 dB 22 wpm 0459z 17 Sep
ON5KQ NO3M 1824.7 CW CQ [LoTW] 67 dB 28 wpm 0458z 17 Sep
GW8IZR NO3M 1824.7 CW CQ [LoTW] 35 dB 28 wpm 0458z 17 Sep
EA5WU N3QE 1821.6 CW CQ [LoTW] 18 dB 23 wpm 0457z 17 Sep
ON5KQ W4DJL 1814.5 CW CQ [LoTW] 16 dB 17 wpm 0456z 17 Sep
ON5KQ N3QE 1821.6 CW CQ [LoTW] 59 dB 22 wpm 0452z 17 Sep
DF4UE NO3M 1824.7 CW CQ [LoTW] 23 dB 28 wpm 0452z 17 Sep
ON5KQ N3QE 1821.6 CW CQ [LoTW] 61 dB 23 wpm 0450z 17 Sep
GW8IZR N3QE 1821.6 CW CQ [LoTW] 16 dB 23 wpm 0449z 17 Sep
EA5WU NO3M 1824.7 CW CQ [LoTW] 28 dB 31 wpm 0447z 17 Sep
GW8IZR NO3M 1824.7 CW CQ [LoTW] 34 dB 30 wpm 0447z 17 Sep
ON5KQ NO3M 1824.7 CW CQ [LoTW] 39 dB 30 wpm 0447z 17 Sep
EA5WU N3QE 1821.6 CW CQ [LoTW] 30 dB 23 wpm 0446z 17 Sep
DF4UE NO3M 1824.7 CW CQ [LoTW] 3 dB 24 wpm 0443z 17 Sep
GW8IZR NO3M 1824.7 CW CQ [LoTW] 14 dB 29 wpm 0440z 17 Sep
GW8IZR N3QE 1821.6 CW CQ [LoTW] 10 dB 22 wpm 0439z 17 Sep
ON5KQ NO3M 1824.7 CW CQ [LoTW] 10 dB 26 wpm 0437z 17 Sep
EA5WU N3QE 1821.6 CW CQ [LoTW] 6 dB 23 wpm 0435z 17 Sep
DF4UE N3RR 1820.5 CW CQ [LoTW] 32 dB 23 wpm 0435z 17 Sep
S50ARX N3QE 1821.6 CW CQ [LoTW] 18 dB 23 wpm 0433z 17 Sep
GW8IZR N3QE 1821.6 CW CQ [LoTW] 42 dB 22 wpm 0428z 17 Sep
EA5WU N3RR 1823.0 CW CQ [LoTW] 23 dB 22 wpm 0420z 17 Sep
ON5KQ N3RR 1823.0 CW CQ [LoTW] 20 dB 22 wpm 0420z 17 Sep
GW8IZR N3RR 1823.0 CW CQ [LoTW] 15 dB 22 wpm 0418z 17 Sep
GW8IZR N3QE 1821.6 CW CQ [LoTW] 42 dB 22 wpm 0417z 17 Sep
ON5KQ N3QE 1821.6 CW CQ [LoTW] 4 dB 23 wpm 0414z 17 Sep
GW8IZR N3QE 1821.6 CW CQ [LoTW] 7 dB 23 wpm 0408z 17 Sep
DF4UE N3QE 1821.6 CW CQ [LoTW] 5 dB 23 wpm 0406z 17 Sep
SV8RV NO3M 1824.7 CW CQ [LoTW] 6 dB 26 wpm 0404z 17 Sep
GW8IZR NO3M 1824.7 CW CQ [LoTW] 9 dB 26 wpm 0404z 17 Sep
S50ARX NO3M 1824.7 CW CQ [LoTW] 6 dB 27 wpm 0403z 17 Sep
DF4UE NO3M 1824.7 CW CQ [LoTW] 7 dB 25 wpm 0400z 17 Sep
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|