The problem is that it appears (at least here) that the lower beacon has also been adjusted down in level? I believe that now people are adjusting their power levels too much down to not be stronger than the lower beacon. The result: when I listened tonight the SSB signals are all too weak. I hope this is not the way it is going to be permanently.
Maintenance on the NB Transponder!
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My measures based on sdr console, the value of noise decrease is around 4 dB...
Good !
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YES !! the difference is seen but above all is felt
good job !!
73 Vale
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The beacon increase dramatically now receiving 9+15 !!! It has two small hills at his side..
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ik4idy Yes, that is known. There are + and - 20 kHz noise skirts , measured/received by many. And .. from what I have been told, a fix is underway.
Great Job !
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Hi Peter,
5 dB confirmed.
The phase noise around the beacons also have increased in intensity.
73, Edson PY2SDR
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PY2SDR Seems to me that you still have around 10 dB transponder noise ? If that is true: "Wow!"
Hi Remco,
The BW you see is the SDRPlay BW after decimation. It is about 300 kHz. Transponder noise is about 2.4~3 dB above the LNBF noise floor.
73, Edson PY2SDR
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ik4idy Yes, that is known. There are + and - 20 kHz noise skirts , measured/received by many. And .. from what I have been told, a fix is underway.
Yes, there is a known problem in the Uplink converter for the beacons, this is planned to be fixed this weekend.. so there will be interruptions on the beacon
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ik4idy Yes, that is known. There are + and - 20 kHz noise skirts , measured/received by many. And .. from what I have been told, a fix is underway.
Thought i have not seen a spectrum plot of the beacon : Maybe it's a problem with the loop filter bandwith of the mixing pll - Might be that it is using a pfd frequency of 20khz ? This often leads to spurs of pfd freq or noise ears in the vicinity of the loop bandwith - Analog Devices has a good software tool calle ADIsimPLL to design loop filters for PLLs
Anyway great job of the hole Amsat team so far and great many thanks for hanging on -
Marcus
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It appears to be an improvement, the average station sounds much clearer and with better S/N.
My own signal was very marginal and I cannot make QSO anymore, but that is probably mostly because the uplink antenna is soaked in the continuous rain we had past week (it has started again).
I already noticed before the parameter changes I was becoming weaker and weaker...
And I do not feel like mounting the new feed right now, that will have to wait.
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It is still pretty strong.
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From the last TP gain adjustment the difference between LNB floor and TP floor has decreased to 2dB. I also noticed the phase noise around the beacons are quite well noticeable now.
73 Ed PY2RN - GG66LW
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Hi Ed PY2RN ,
the earth covered by QO100 is now in shadow, i.e. less thermal noise? Could that be a reason? I noticed the same.. In addition, every 5-9 seconds I'm seeing a burst over the passband (only)... maybe radar? The horizontal small bands.. I changed some settings in the lower part.. an the tombstone same level as 2 days ago..
Anyone having similar observations?
73s Peter
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