Re: 10 Mar 2025 Doubtful Io-B and real TPs
Hi Sabine,
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Wow nice one. The TP is popping out nicely!
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Huub
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10 Mar 2025 Doubtful Io-B and real TPs
It would take a lot of imagination to pass the spots off as Io-B. But the TPs are real and really beautiful!
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Sabine
--
Germany
Standard time: UTC +1 hour
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Re: How much do your calibrations vary?
Jim To be honest Jim I¡¯ve been working on taxes every spare minute. Think I¡¯m close to finished. But I can barely see any thickness in the plot. I need to move the calibrator over to a different computer and I¡¯ll let it run a week or so and send you a plot. It¡¯s pretty stable. I run the attenuators at 3.3 volts from an optoisolator which may help some. Looking forward to your new board.? Larry
Thank you Larry.? Appreciate the encouragement.
Jim Yes good idea Jim. I have voltage regulators on each calibrator voltage line, 12v, 5v, and 3.3v and I can tell you they do drift slightly over months of time. Have not charted that but might be another source of change. I have to tweak them a few hundredths or tenths of a volt every month or two but seldom more than a volt. I keep an external box fan ?on 24/7 behind the desktop JOVE computers and calibrator. I have one older Dell that the power supply is slightly under sized and it runs hot. These new NVIDIA graphic cards are power hungry. When you purchase new computers its wise, I found out, to select largest power supply available. Even more of an issue for those running laptops. With radio room ?HVAC temp control and fan for additional circulation, temp never varys in the radio room much more than two degrees. I have one experimental test equipment box I fabricated ?that's ?temperature controlled with peltier thermoelectric modules and PT100 sensitive platinum RTD temperature sensors that can regulate its metal cabinet temp to less than one degree.?
Jim your new calibrator board should be super stable.? Larry ?
This is an outstanding line of
investigation, Jim!? Excellent idea.
--
Dave
On 3/10/25 00:47, Jim Sky wrote:
For those who have ongoing observations and working
calibrators,? I would like to ask a favor.? I want to see how
much your calibrations vary over time.? If you have the
calibrator running automatically every observation changes in
the calibration plot will probably show some "thickening"
indicating the amount of variance over several days.? Watching
that display can give some confidence that things have not
changed due to a problem in the telescope. Below is a copy of my
calibration plot for my dipole over 10 consecutive days.? It is
hard to know where this variation comes from, the receiver or
the calibrator.? My experience has been that the SDRPlay 1A
really requires an hour warmup to fully stabilize, which would
indicate some temperature dependency probably even after the
warmup.? The noise generator inside probably has some power
drift with temperature and may have some sensitivity also to
changes in it's power supply voltage. While it would be good to
sort out the source of calibration plot variation, I am mostly
interested in setting realistic error bars to our measurement.??
?
If you can, please post a screenshot of your calibration
chart (like mine below) after it has run uninterrupted for 10 or
more days.? Also I would like to have your best guess at how
much temperature variation your receiver and calibrator
experienced from night to night when the observation started.?
For example, my setup is in a partially heated room that
experienced big differences from night to night during the
period shown on the plot and I estimate it experienced about 8
degrees C from night to night.? ?I am interested in the
temperatures when the calibration was performed, not throughout
the day.? If your house has a well regulated heating system your
system might experience less than a degree of variation between
calibrations.
?
Thanks!
--
Jim Sky?
radiosky at radiosky dot com
|
Re: How much do your calibrations vary?
Thank you Larry.? Appreciate the encouragement.
Jim Yes good idea Jim. I have voltage regulators on each calibrator voltage line, 12v, 5v, and 3.3v and I can tell you they do drift slightly over months of time. Have not charted that but might be another source of change. I have to tweak them a few hundredths or tenths of a volt every month or two but seldom more than a volt. I keep an external box fan ?on 24/7 behind the desktop JOVE computers and calibrator. I have one older Dell that the power supply is slightly under sized and it runs hot. These new NVIDIA graphic cards are power hungry. When you purchase new computers its wise, I found out, to select largest power supply available. Even more of an issue for those running laptops. With radio room ?HVAC temp control and fan for additional circulation, temp never varys in the radio room much more than two degrees. I have one experimental test equipment box I fabricated ?that's ?temperature controlled with peltier thermoelectric modules and PT100 sensitive platinum RTD temperature sensors that can regulate its metal cabinet temp to less than one degree.?
Jim your new calibrator board should be super stable.? Larry ?
This is an outstanding line of
investigation, Jim!? Excellent idea.
--
Dave
On 3/10/25 00:47, Jim Sky wrote:
For those who have ongoing observations and working
calibrators,? I would like to ask a favor.? I want to see how
much your calibrations vary over time.? If you have the
calibrator running automatically every observation changes in
the calibration plot will probably show some "thickening"
indicating the amount of variance over several days.? Watching
that display can give some confidence that things have not
changed due to a problem in the telescope. Below is a copy of my
calibration plot for my dipole over 10 consecutive days.? It is
hard to know where this variation comes from, the receiver or
the calibrator.? My experience has been that the SDRPlay 1A
really requires an hour warmup to fully stabilize, which would
indicate some temperature dependency probably even after the
warmup.? The noise generator inside probably has some power
drift with temperature and may have some sensitivity also to
changes in it's power supply voltage. While it would be good to
sort out the source of calibration plot variation, I am mostly
interested in setting realistic error bars to our measurement.??
?
If you can, please post a screenshot of your calibration
chart (like mine below) after it has run uninterrupted for 10 or
more days.? Also I would like to have your best guess at how
much temperature variation your receiver and calibrator
experienced from night to night when the observation started.?
For example, my setup is in a partially heated room that
experienced big differences from night to night during the
period shown on the plot and I estimate it experienced about 8
degrees C from night to night.? ?I am interested in the
temperatures when the calibration was performed, not throughout
the day.? If your house has a well regulated heating system your
system might experience less than a degree of variation between
calibrations.
?
Thanks!
--
Jim Sky?
radiosky at radiosky dot com
|
Re: Some non-Io-A from tonight March 09 2025
Here is a little bit of the non-Io-A from last night later than 00hr UTC.? The second image shows the positive drift portion seen in the first image in more detail.
?
Richard
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Spectrograms have been nothing but lightening strikes for hours. Very large storm in Florida, Georgia, and South Carolina (about 1100 miles southeast from Prospect, ME) and small storms west of the Canary Islands.
?
https://map.blitzortung.org/#3.83/33.08/-56.1
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Re: Some non-Io-A from tonight March 09 2025
Hi Dave,
?
Thanks for those interesting comments.? I am still just at the beginning of understanding the nuances of ionospheric propagation and, for that matter, the mechanisms behind Jupiter-Io DAM emission.?
?
The non-Io-A emission continued beyond 0h UTC last night into that little "peninsula" of non-Io-A that actually lies above Io-C.? I will be posting some of that once that datafile is zipped up and loaded onto our data server.? However, looking at the screen shots that I took last night, some of that shows a positive frequency drift as well.
?
Best wishes,? Richard
|
Re: How much do your calibrations vary?
Jim Yes good idea Jim. I have voltage regulators on each calibrator voltage line, 12v, 5v, and 3.3v and I can tell you they do drift slightly over months of time. Have not charted that but might be another source of change. I have to tweak them a few hundredths or tenths of a volt every month or two but seldom more than a volt. I keep an external box fan ?on 24/7 behind the desktop JOVE computers and calibrator. I have one older Dell that the power supply is slightly under sized and it runs hot. These new NVIDIA graphic cards are power hungry. When you purchase new computers its wise, I found out, to select largest power supply available. Even more of an issue for those running laptops. With radio room ?HVAC temp control and fan for additional circulation, temp never varys in the radio room much more than two degrees. I have one experimental test equipment box I fabricated ?that's ?temperature controlled with peltier thermoelectric modules and PT100 sensitive platinum RTD temperature sensors that can regulate its metal cabinet temp to less than one degree.?
Jim your new calibrator board should be super stable.? Larry
toggle quoted message
Show quoted text
On Mar 10, 2025, at 1:10?AM, Dave Typinski via groups.io <davetyp@...> wrote:
?
This is an outstanding line of
investigation, Jim!? Excellent idea.
--
Dave
On 3/10/25 00:47, Jim Sky wrote:
For those who have ongoing observations and working
calibrators,? I would like to ask a favor.? I want to see how
much your calibrations vary over time.? If you have the
calibrator running automatically every observation changes in
the calibration plot will probably show some "thickening"
indicating the amount of variance over several days.? Watching
that display can give some confidence that things have not
changed due to a problem in the telescope. Below is a copy of my
calibration plot for my dipole over 10 consecutive days.? It is
hard to know where this variation comes from, the receiver or
the calibrator.? My experience has been that the SDRPlay 1A
really requires an hour warmup to fully stabilize, which would
indicate some temperature dependency probably even after the
warmup.? The noise generator inside probably has some power
drift with temperature and may have some sensitivity also to
changes in it's power supply voltage. While it would be good to
sort out the source of calibration plot variation, I am mostly
interested in setting realistic error bars to our measurement.??
?
If you can, please post a screenshot of your calibration
chart (like mine below) after it has run uninterrupted for 10 or
more days.? Also I would like to have your best guess at how
much temperature variation your receiver and calibrator
experienced from night to night when the observation started.?
For example, my setup is in a partially heated room that
experienced big differences from night to night during the
period shown on the plot and I estimate it experienced about 8
degrees C from night to night.? ?I am interested in the
temperatures when the calibration was performed, not throughout
the day.? If your house has a well regulated heating system your
system might experience less than a degree of variation between
calibrations.
?
Thanks!
--
Jim Sky?
radiosky at radiosky dot com
|
Re: How much do your calibrations vary?
This is an outstanding line of
investigation, Jim!? Excellent idea.
--
Dave
On 3/10/25 00:47, Jim Sky wrote:
toggle quoted message
Show quoted text
For those who have ongoing observations and working
calibrators,? I would like to ask a favor.? I want to see how
much your calibrations vary over time.? If you have the
calibrator running automatically every observation changes in
the calibration plot will probably show some "thickening"
indicating the amount of variance over several days.? Watching
that display can give some confidence that things have not
changed due to a problem in the telescope. Below is a copy of my
calibration plot for my dipole over 10 consecutive days.? It is
hard to know where this variation comes from, the receiver or
the calibrator.? My experience has been that the SDRPlay 1A
really requires an hour warmup to fully stabilize, which would
indicate some temperature dependency probably even after the
warmup.? The noise generator inside probably has some power
drift with temperature and may have some sensitivity also to
changes in it's power supply voltage. While it would be good to
sort out the source of calibration plot variation, I am mostly
interested in setting realistic error bars to our measurement.??
?
If you can, please post a screenshot of your calibration
chart (like mine below) after it has run uninterrupted for 10 or
more days.? Also I would like to have your best guess at how
much temperature variation your receiver and calibrator
experienced from night to night when the observation started.?
For example, my setup is in a partially heated room that
experienced big differences from night to night during the
period shown on the plot and I estimate it experienced about 8
degrees C from night to night.? ?I am interested in the
temperatures when the calibration was performed, not throughout
the day.? If your house has a well regulated heating system your
system might experience less than a degree of variation between
calibrations.
?
Thanks!
--
Jim Sky?
radiosky at radiosky dot com
|
How much do your calibrations vary?
For those who have ongoing observations and working calibrators,? I would like to ask a favor.? I want to see how much your calibrations vary over time.? If you have the calibrator running automatically every observation changes in the calibration plot will probably show some "thickening" indicating the amount of variance over several days.? Watching that display can give some confidence that things have not changed due to a problem in the telescope. Below is a copy of my calibration plot for my dipole over 10 consecutive days.? It is hard to know where this variation comes from, the receiver or the calibrator.? My experience has been that the SDRPlay 1A really requires an hour warmup to fully stabilize, which would indicate some temperature dependency probably even after the warmup.? The noise generator inside probably has some power drift with temperature and may have some sensitivity also to changes in it's power supply voltage. While it would be good to sort out the source of calibration plot variation, I am mostly interested in setting realistic error bars to our measurement.??
?
If you can, please post a screenshot of your calibration chart (like mine below) after it has run uninterrupted for 10 or more days.? Also I would like to have your best guess at how much temperature variation your receiver and calibrator experienced from night to night when the observation started.? For example, my setup is in a partially heated room that experienced big differences from night to night during the period shown on the plot and I estimate it experienced about 8 degrees C from night to night.? ?I am interested in the temperatures when the calibration was performed, not throughout the day.? If your house has a well regulated heating system your system might experience less than a degree of variation between calibrations.
?
Thanks!
--
Jim Sky?
radiosky at radiosky dot com
|
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|
Hi
?
Solar events Today
?
Salvador
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Re: Some non-Io-A from tonight March 09 2025
Very nice non-Io-A, Richard.
The increasing frequency circa 2244 to 2252 UTC is interesting. That may say more about the ionosphere than the arc shape.
Non-Io-A is always vertex late (negative freq drift).
Non-Io-B is RCP and has a positive freq drift -- but it would be very strange, albeit not impossible, to see non-Io-B emission way over in the non-Io-A zone.
Most likely that positive rate was due to ionospheric effects. Sometimes the emission can appear to have drift rate opposite of what's expected across a MHz or three if ionospheric dynamics decide to join the party. I suspect that's what's happening here. When the analysis is zoomed out to a half hour or more and to 10 MHz bandwidth or more, then the true arc shape becomes more apparent.
--
Dave
toggle quoted message
Show quoted text
On 3/9/25 21:31, Richard Gray via groups.io wrote: I think this is classified as non-Io-A. This is from earlier tonight.
Richard
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Thanks Richard!? I appreciate you getting back to me. Peter
Hi Peter,
?
On these images, the offset was about 1420 with a color gain of about 7.? Those settings may not work with images from all SDRs.? I have a site with a fairly low background and I am using an SDR (RX-888 Mk II) which has a 16bit ADC, so it has a good dynamic range.
?
Richard
|
Hi Peter,
?
On these images, the offset was about 1420 with a color gain of about 7.? Those settings may not work with images from all SDRs.? I have a site with a fairly low background and I am using an SDR (RX-888 Mk II) which has a 16bit ADC, so it has a good dynamic range.
?
Richard
|
Some non-Io-A from tonight March 09 2025
I think this is classified as non-Io-A.?? This is from earlier tonight.
?
Richard
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Some solar from today.
?
Richard
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Some more Io-B from last night March 08/09 2025
Some more from the Io-B storm of last night.
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Richard
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Solar 03/09/2025 Easley, South Carolina
Good evening again:
? ? ?Solar from today.
John
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Sabine Cremer
Larry Dodd
Dave Typinski
Jim Sky
salvador aguirre
