Hallo...
same setup .... and a new picture one day later 9october2019
73 de dg0opk
QO-100 solar conjunction nearing!
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Today, I've done some measurements of sun noise, using my setup for QO-100. Dish 95 cm, LNB Sat-Signal unmodified, and RSP1A, using SDR Console feature of Signal History, that creates CSV file with all the required information.
I measured at 10.600 MHz to avoid the effect of QO-100 transponder base noise on Wide USB 10 Khz BW.
After some excel work the results were +3. dB Noise increase. See picture.
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Hallo...
same setup agn WB TP on 85cm OffsetDish centered to ASTRA 19.2 so 7degrees off center to 26east (QO-100)....
and a 2 pictures from today 10 october 2019
in maximum noise level -86dBm
after maximum Noise level around -89dBm
73 de dg0opk
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Very interesting work. Thanks Alejandro for searing it with us.
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I did not have much time but had a quick check: MER decreased here from 10 to 6.4dB while the sun was behind QO-100.
Kind regards
Matthias
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The sun is again passing behind QO-100 these days - at least for us on middle northern latitudes. You can use: https://www.satellite-calculat…llite/suninterference.php to find the exact time. Today at 10:16:29 Goonhilly WebSDR had QO-100 and the sun aligned - within 0,16 degree - with an increase in noise floor as result. See attached recording covering about 20 min. Noise increase about 4 dB.
On my 85 cm offset dish I measured a noise increase of 2,5 dB within the transponder BW. Outside the transponder noise, the increase was 4 dB.
73 OZ2OE
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Hello all,
I realize that this thread is about a year old, but we have the sun passing behind QO-100 happening twice a year. Today I took the opportunity to record the noise of the sun passing behind my 1.8m CAS 180 Kathrein offset dish, pointing to QO-100.
Reception equipment: Octagon LNB, stabilized with external GPS-disciplined TCXO, RSP1A, SDRUno to record the CSV file of the field strength. QRG: 10.487,500 MHz.
I got a textbook-graph of the sun passing almost exactly behind my dish today.
Vy 73
Holger 'Geri', DK8KW
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Ah - I wish people would post this a week before the event and not just before. First time the sun has been out in a month and I am too late. Tomorrow is work again....
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Ah - I wish people would post this a week before the event and not just before. First time the sun has been out in a month and I am too late. Tomorrow is work again....
Here is the requested reminder
By the way, there is an excellent online calculator for this purpose.
https://www.satellite-calculat…llite/suninterference.php
After selecting the satellite (25.81° E) you can enter the downlink frequency and the used dish size.
For the location there is a map with search function.
73 Roland -
I’m using WXtrack by David Taylor for my satellite needs and predicts the #Solaroutage precisely. https://twitter.com/gm8arv
http://www.satsignal.eu/software/wxtrack.htm
73s Alex
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So this time I caught it and the sun was out. I see a tree shadow at the base of the dish so some tree-trimming is going to be needed. At the moment it's just a little blockage but trees grow. A little over 10 dB of noise uplift was noted. This is with a 2.4m dish and a POTY feed.
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Just measured 3.0db which is within 0.1 db of last year on my 90cm RX dish.
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3 dB too for me with a 80cm dish...
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Further update:
I remeasured the next day and found the sun-noise was 5dB. Looks like I need to reposition the dish!
