Re: Solar Activity reported by this group.
How bought a peer reviewed "real" science paper instead?
Chuck, Looks like that could be written up as a good Citizen Science project.?
Hi Chuck, I am sure that what your students did was more accurate.?As the number of observers has grown so would the total observation number for any given week, as I am just using the number of reported?observations.? It is very rough.?? Jim
On Fri, May 23, 2025 at 10:55?AM Chuck Higgins via <Chuck.Higgins= [email protected]> wrote:
Hey Jim and all,
?
? This is fantastic. AI and a good human brain -- to double-check the AI brain -- are going to
be game changers in research and data analysis. This is a great example. I¡¯m trying to get
my student to write some python code to help count solar bursts, and we¡¯ve had some success,
but not yet good enough.
??This is my old-fashioned method of using students (they were paid) to count solar bursts
on Radio-Skypipe records from 2005 to 2018. Again, trying to get a student to bring this
graph up to date but it¡¯s slow going.
?
Cheers,
?
Chuck
?
?
Below is a chart showing reported solar activity by this group since it started.? This was done with ChatGPT's help and only includes new posts with an image and using keywords. It is just an approximate value.? The idea was to see if our
activity on this group approximates the solar activity (using sunspot number because it was easy to get) and as an exercise for me to see if something might be done to facilitate archiving these curated reports.? ?All of the activity of this group was downloaded
as a single 12 GB mbox file which was then used to produce a single filtered CSV file.? GPT then analyzed the CSV file and produced a python program the does the histogram.??
Jim Sky?
radiosky at radiosky dot com
|
Re: Solar Activity reported by this group.
Chuck, Looks like that could be written up as a good Citizen Science project.?
Hi Chuck, I am sure that what your students did was more accurate.?As the number of observers has grown so would the total observation number for any given week, as I am just using the number of reported?observations.? It is very rough.?? Jim
On Fri, May 23, 2025 at 10:55?AM Chuck Higgins via <Chuck.Higgins= [email protected]> wrote:
Hey Jim and all,
?
? This is fantastic. AI and a good human brain -- to double-check the AI brain -- are going to
be game changers in research and data analysis. This is a great example. I¡¯m trying to get
my student to write some python code to help count solar bursts, and we¡¯ve had some success,
but not yet good enough.
??This is my old-fashioned method of using students (they were paid) to count solar bursts
on Radio-Skypipe records from 2005 to 2018. Again, trying to get a student to bring this
graph up to date but it¡¯s slow going.
?
Cheers,
?
Chuck
?
?
Below is a chart showing reported solar activity by this group since it started.? This was done with ChatGPT's help and only includes new posts with an image and using keywords. It is just an approximate value.? The idea was to see if our
activity on this group approximates the solar activity (using sunspot number because it was easy to get) and as an exercise for me to see if something might be done to facilitate archiving these curated reports.? ?All of the activity of this group was downloaded
as a single 12 GB mbox file which was then used to produce a single filtered CSV file.? GPT then analyzed the CSV file and produced a python program the does the histogram.??
Jim Sky?
radiosky at radiosky dot com
|
Re: Solar Activity reported by this group.
Hi Chuck, I am sure that what your students did was more accurate.?As the number of observers has grown so would the total observation number for any given week, as I am just using the number of reported?observations.? It is very rough.?? Jim
On Fri, May 23, 2025 at 10:55?AM Chuck Higgins via <Chuck.Higgins= [email protected]> wrote:
Hey Jim and all,
?
? This is fantastic. AI and a good human brain -- to double-check the AI brain -- are going to
be game changers in research and data analysis. This is a great example. I¡¯m trying to get
my student to write some python code to help count solar bursts, and we¡¯ve had some success,
but not yet good enough.
??This is my old-fashioned method of using students (they were paid) to count solar bursts
on Radio-Skypipe records from 2005 to 2018. Again, trying to get a student to bring this
graph up to date but it¡¯s slow going.
?
Cheers,
?
Chuck
?
?
Below is a chart showing reported solar activity by this group since it started.? This was done with ChatGPT's help and only includes new posts with an image and using keywords. It is just an approximate value.? The idea was to see if our
activity on this group approximates the solar activity (using sunspot number because it was easy to get) and as an exercise for me to see if something might be done to facilitate archiving these curated reports.? ?All of the activity of this group was downloaded
as a single 12 GB mbox file which was then used to produce a single filtered CSV file.? GPT then analyzed the CSV file and produced a python program the does the histogram.??
Jim Sky?
radiosky at radiosky dot com
|
Re: Solar Activity reported by this group.
I saw that too Bill.? Christmas shopping?? I think we may be the only game in town for HF solar bursts.? I think NOAA may have a 245 MHz radio dataset.?
Jim
Thanks...as someone who is new to this "game" some interesting gaps in reports during the Fall and Early winter of 2024-2025.
?
I wonder how the graph would look it events reports by the experts in Solar Events Reports were included? Beyond me to included them!
...bill....
|
Re: Solar Activity reported by this group.
Hey Jim and all,
?
? This is fantastic. AI and a good human brain -- to double-check the AI brain -- are going to
be game changers in research and data analysis. This is a great example. I¡¯m trying to get
my student to write some python code to help count solar bursts, and we¡¯ve had some success,
but not yet good enough.
??This is my old-fashioned method of using students (they were paid) to count solar bursts
on Radio-Skypipe records from 2005 to 2018. Again, trying to get a student to bring this
graph up to date but it¡¯s slow going.
?
Cheers,
?
Chuck
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Jim Sky via groups.io
Sent: Thursday, May 22, 2025 12:20 AM
To: [email protected]
Subject: [EXTERNAL] [Radio JOVE] Solar Activity reported by this group.
?
Below is a chart showing reported solar activity by this group since it started.? This was done with ChatGPT's help and only includes new posts with an image and using keywords. It is just an approximate value.? The idea was to see if our
activity on this group approximates the solar activity (using sunspot number because it was easy to get) and as an exercise for me to see if something might be done to facilitate archiving these curated reports.? ?All of the activity of this group was downloaded
as a single 12 GB mbox file which was then used to produce a single filtered CSV file.? GPT then analyzed the CSV file and produced a python program the does the histogram.??
Jim Sky?
radiosky at radiosky dot com
|
Re: Solar Activity reported by this group.
Thanks...as someone who is new to this "game" some interesting gaps in reports during the Fall and Early winter of 2024-2025.
?
I wonder how the graph would look it events reports by the experts in Solar Events Reports were included? Beyond me to included them!
...bill....
|
Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Hi Larry,
?
SDRc2RSS reports that the noise floor is at -143.6dBm.
?
Richard
|
Re: LINEARITY - MEASUREMENTS
Thanks, Jim, for once again making me read the description of Radio SkyPipe.? I've searched the www for other strip chart applications and found none as useful (and mostly free).?
However, please note that many, maybe most, of us are no longer using the sound card.? As my diagram which I sent out yesterday illustrated, using any of the SDR applications (my favorite has become SDR Console), we need SW link between that application and RSP.? For many of us, we use VB Cable.? Not that it's perfect, but.....? At LTO one long afternoon a couple of years ago, Terry and I sat down to sleuth out our data stream.? We caught VB Cable dropping chunks of data which plays havoc with additional data analysis.? Yes, it's a consumer product aimed at the audio world and we're attempting to use it for real science.? Reminding us.....that we are still amateurs.
Are there differences with RSP between porting directly from a sound card? to porting through a virtual audio cable application to RSP?? Many of us, myself included, no longer involve the sound card.? If I truly need a sound card, I use the Beringer UMC 202HD.??
In rather extensive testing and experimenting, I've discovered most of the PC and consumer directed sound cards, be they internal or external, do not perform to the advertised specifications.? One of the M-Audio external cards produced so much RFI I could not use it for radio astronomy or much of anything else.? Sound Blaster and many ASUS products are especially guilty of that.? I spent too much $$$ on Sound Blaster cards believing their published specs until I did some quantitative testing on the bench.? I finally went with Beringer which in some aspects exceeds and is true to their advertised specifications.? Buyer beware!
Dave - W?LEV
Hi Dave,
The detection method selected in RSP makes a big difference in how it processes
the input data, and as such, whether the output is linear with respect to its input.
--
Dave
On 5/22/25 10:44, W0LEV via wrote:
> I've confirmed a number of times using a number of professional spectrum
> analyzers that the signal generator is putting out what the knobs indicate.? The
> non-linearity is not due to the HP8648C.? My personal "target" for the
> non-linearity would be in order: 1)? VB Cable and? 2)? SkyPipe.
>
> I can test SkyPipe as I did the HP8648C, but VB Cable has no hooks other than
> links between applications within the PC.? Possibly Jim Sky could comment on the
> linearity of SkyPipe?
>
> I well realize the difference between white noise cal and my single signal
> tests.? But either will expose non-linearities in the system.? I have a known
> professional noise generator source which I could use which I used to calibrate
> the old RJ setup which employed only Radio SkyPips.? That was far easier and
> quite intuitive.? ?Personally I am not a fan of judging colors.? No two pairs of
> human eyes view subtle color differences and/or intensities identically.? But
> they sure make pleasing and attractive plots.? Just my two-cents.
>
> Any additional suggestions as to how best to sleuth the non-linearities I exposed?
>
> I have an SDRPlay RSP1.? Early on with our experiments with those at LTO (Little
> Thompson Observatory), here at home for me and Terry's (Dr. Terrance Bullette)
> experiments, we sadly discovered it was sorely prone to IMD and overload.
> That's why at LTO (and personally) we collectively placed the SDRPlay products
> on the shelf where they still reside.? I've only recently obtained an RX-888
> MKII, but, man, does it eat the 5-vdc power like a Class A amplifier at L-Band!
>
> Dave - W?LEV
>
>
>
> <>
>
> <>
>
> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
> On Thu, May 22, 2025 at 2:00?AM Larry Dodd via <>
> <101science=[email protected] <mailto:[email protected]>> wrote:
>
>? ? ?Dave
>? ? ?The non-linearity isn¡¯t in SDR Console for sure. You¡¯re using a single
>? ? ?frequency stepped calibration where we use Jim Sky¡¯s stepped wide band noise
>? ? ?calibrator spanning ~8 MHz. If you have a known calibrated power meter you
>? ? ?could check your HP output. That would help to tell you where the
>? ? ?non-linearity lies.
>? ? ?Larry
>
>? ? ?_______________________
>
>
>
>? ? ?On Wed, May 21, 2025 at 9:48?PM W0LEV via <>
>? ? ?<davearea51a=[email protected] <mailto:[email protected]>> wrote:
>
>? ? ? ? ?I was intrigued by the calibration of the standard RJ setup.? While I do
>? ? ? ? ?not use that setup, I decided to measure what I use for other purposes,
>? ? ? ? ?including RJ.? So, have a read of the attachment.? I'm using the AirSpy
>? ? ? ? ?Discovery HF+ to test the linearity.? The system is diagrammed to start
>? ? ? ? ?and then, I ran an HP generator up by 10 dB steps ultimately into Radio
>? ? ? ? ?SkyPipe.? I was somewhat disappointed at the non-linear behavior of the
>? ? ? ? ?system.? Please have a read of the attachment.
>
>? ? ? ? ?CONCLUSION:? Yes, calibration is needed if linear response to the input
>? ? ? ? ?is required!!!
>
>? ? ? ? ?Dave - W?LEV*
>? ? ? ? ?*
>
>
>
>
> --
> *Dave - W?LEV
> *
>
>
>
|
Re: LINEARITY - MEASUREMENTS
Hi Dave,
The detection method selected in RSP makes a big difference in how it processes the input data, and as such, whether the output is linear with respect to its input.
--
Dave
toggle quoted message
Show quoted text
On 5/22/25 10:44, W0LEV via groups.io wrote: I've confirmed a number of times using a number of professional spectrum
analyzers that the signal generator is putting out what the knobs indicate. The
non-linearity is not due to the HP8648C. My personal "target" for the
non-linearity would be in order: 1) VB Cable and 2) SkyPipe.
I can test SkyPipe as I did the HP8648C, but VB Cable has no hooks other than
links between applications within the PC. Possibly Jim Sky could comment on the
linearity of SkyPipe?
I well realize the difference between white noise cal and my single signal
tests. But either will expose non-linearities in the system. I have a known
professional noise generator source which I could use which I used to calibrate
the old RJ setup which employed only Radio SkyPips. That was far easier and
quite intuitive. Personally I am not a fan of judging colors. No two pairs of
human eyes view subtle color differences and/or intensities identically. But
they sure make pleasing and attractive plots. Just my two-cents.
Any additional suggestions as to how best to sleuth the non-linearities I exposed?
I have an SDRPlay RSP1. Early on with our experiments with those at LTO (Little
Thompson Observatory), here at home for me and Terry's (Dr. Terrance Bullette)
experiments, we sadly discovered it was sorely prone to IMD and overload.
That's why at LTO (and personally) we collectively placed the SDRPlay products
on the shelf where they still reside. I've only recently obtained an RX-888
MKII, but, man, does it eat the 5-vdc power like a Class A amplifier at L-Band!
Dave - W?LEV
<>
Virus-free.www.avg.com
<>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
On Thu, May 22, 2025 at 2:00?AM Larry Dodd via groups.io <>
<101science@... <mailto:[email protected]>> wrote:
Dave
The non-linearity isn¡¯t in SDR Console for sure. You¡¯re using a single
frequency stepped calibration where we use Jim Sky¡¯s stepped wide band noise
calibrator spanning ~8 MHz. If you have a known calibrated power meter you
could check your HP output. That would help to tell you where the
non-linearity lies.
Larry
_______________________
On Wed, May 21, 2025 at 9:48?PM W0LEV via groups.io <>
<davearea51a@... <mailto:[email protected]>> wrote:
I was intrigued by the calibration of the standard RJ setup. While I do
not use that setup, I decided to measure what I use for other purposes,
including RJ. So, have a read of the attachment. I'm using the AirSpy
Discovery HF+ to test the linearity. The system is diagrammed to start
and then, I ran an HP generator up by 10 dB steps ultimately into Radio
SkyPipe. I was somewhat disappointed at the non-linear behavior of the
system. Please have a read of the attachment.
CONCLUSION: Yes, calibration is needed if linear response to the input
is required!!!
Dave - W?LEV*
*
--
*Dave - W?LEV
*
|
Re: Solar Activity reported by this group.
Jim: ? ? ?Incredible job! Thanks for accomplishing this and sharing with everyone.
On Thursday, May 22, 2025, 1:20 AM, Jim Sky <radiosky@...> wrote: Below is a chart showing reported solar activity by this group since it started.? This was done with ChatGPT's help and only includes new posts with an image and using keywords. It is just an approximate value.? The idea was to see if our activity on this group approximates the solar activity (using sunspot number because it was easy to get) and as an exercise for me to see if something might be done to facilitate archiving these curated reports.? ?All of the activity of this group was downloaded as a single 12 GB mbox file which was then used to produce a single filtered CSV file.? GPT then analyzed the CSV file and produced a python program the does the histogram.??
?
?
--
Jim Sky?
radiosky at radiosky dot com
|
Re: LINEARITY - MEASUREMENTS
I've confirmed a number of times using a number of professional spectrum? analyzers that the signal generator is putting out what the knobs indicate.? The non-linearity is not due to the HP8648C.? My personal "target" for the non-linearity would be in order: 1)? VB Cable and? 2)? SkyPipe.
I can test SkyPipe as I did the HP8648C, but VB Cable has no hooks other than links between applications within the PC.? Possibly Jim Sky could comment on the linearity of SkyPipe?
I well realize the difference between white noise cal and my single signal tests.? But either will expose non-linearities in the system.? I have a known professional noise generator source which I could use which I used to calibrate the old RJ setup which employed only Radio SkyPips.? That was far easier and quite intuitive. ? Personally I am not a fan of judging colors.? No two pairs of human eyes view subtle color differences and/or intensities identically.? But they sure make pleasing and attractive plots.? Just my two-cents.
Any additional suggestions as to how best to sleuth the non-linearities I exposed?
I have an SDRPlay RSP1.? Early on with our experiments with those at LTO (Little Thompson Observatory), here at home for me and Terry's (Dr. Terrance Bullette) experiments, we sadly discovered it was sorely prone to IMD and overload.? That's why at LTO (and personally) we collectively placed the SDRPlay products on the shelf where they still reside.? I've only recently obtained an RX-888 MKII, but, man, does it eat the 5-vdc power like a Class A amplifier at L-Band! ? ?
Dave - W?LEV?
?
Dave The non-linearity isn¡¯t in SDR Console for sure. You¡¯re using a single frequency stepped calibration where we use Jim Sky¡¯s stepped wide band noise calibrator spanning ~8 MHz. If you have a known calibrated power meter you could check your HP output. That would help to tell you where the non-linearity lies.
I was intrigued by the calibration of the standard RJ setup.? While I do not use that setup, I decided to measure what I use for other purposes, including RJ.? So, have a read of the attachment.? I'm using the AirSpy Discovery HF+ to test the linearity.? The system is diagrammed to start and then, I ran an HP generator up by 10 dB steps ultimately into Radio SkyPipe.? I was somewhat disappointed at the non-linear behavior of the system.? Please have a read of the attachment.
CONCLUSION:? Yes, calibration is needed if linear response to the input is required!!!
Dave - W?LEV
|
Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Hi Richard,
?
Great! That's looking much better than mine indeed. I'll use your settings and see if it reflects the results, and do some more tinkering.?
?
There is an interesting article on the web:
Yes I know about the article from KA7OEI. I think it's great. I used it to fine tune my rx2fits / rx2fits2rss setup, mainly used to capture solar events. A Pretty straight forward setup come to think of it. There is not much of a calibration involved.?
?
I'm also very happy with the helpful remarks from Larry.?
?
The Dark Sky Observatory is best described as "quite rural".? In that case the noise floor may be -130 dB or lower.? In more noisy environments it can be quite a bit higher. ?The?dB Threshold on SDRc2RSS corresponds to that noise floor, and one should not raise it above the actual noise floor else some faint signals will be lost.?
Noted! I'll use this as a rule of thumb.
?
I think I have to recalibrate my different setups. ?
The environment I have to put up with residential (rural) so I have to live with a higher noise floor.
?
I think trying out a small amount of pre-amplification is a good idea, and I have ordered an RF pre-amp and will give it a try when it comes.
I tried different pre-amp's. Most of them give about 20dB and couldn't find one with less amplification so I had to put attenuation inline. I do not like that setup, mainly because of the necessary attenuation. I wish I could find an adjustable one or one with less power.
?
?
Huub
?
?
?
?
?
|
Solar Activity reported by this group.
Below is a chart showing reported solar activity by this group since it started.? This was done with ChatGPT's help and only includes new posts with an image and using keywords. It is just an approximate value.? The idea was to see if our activity on this group approximates the solar activity (using sunspot number because it was easy to get) and as an exercise for me to see if something might be done to facilitate archiving these curated reports.? ?All of the activity of this group was downloaded as a single 12 GB mbox file which was then used to produce a single filtered CSV file.? GPT then analyzed the CSV file and produced a python program the does the histogram.??
?
?
--
Jim Sky?
radiosky at radiosky dot com
|
Re: The FFT and nuclear weapons
Here's another article, tangentially related. I love the tidbit about Tukey and Hamming.
--
Dave
toggle quoted message
Show quoted text
On 5/20/25 11:56, Larry Dodd via groups.io wrote: Dave,
That's a very good history of the DFFT. I think you sent that video to me before
and it's excellent. Thanks. It¡¯s amazing to me that current discoveries are
actually based on work by others decades ago. Gauss, Maxwell, Einstein, Hawking,
Penrose (Roger is 93) and others had/have a gift of understanding far beyond
anyone else. Why were they so gifted? Einstein was rejected by every university
he applied to for professorship. Had to do humble work in a patent office to
feed his family.
On a sad note I just read where USA sold our latest AI technology to the Arabs
for a few $$$$. Scary thought. AI in unethical hands is dangerous to humanity.
Same with Quantum computing technology. Those two technologies are set to change
human life drastically.
Larry
_______________________
On Mon, May 19, 2025 at 10:20?PM Dave Typinski via groups.io <>
<davetyp@... <mailto:[email protected]>> wrote:
Here's a very interesting explanation of how and why the modern FFT came to
exist in the 1960s, then we discover that Gauss had already invented it, but
never published it.
Veritasium - The Most Important Algorithm of All Time
--
Dave
|
Re: LINEARITY - MEASUREMENTS
Dave The non-linearity isn¡¯t in SDR Console for sure. You¡¯re using a single frequency stepped calibration where we use Jim Sky¡¯s stepped wide band noise calibrator spanning ~8 MHz. If you have a known calibrated power meter you could check your HP output. That would help to tell you where the non-linearity lies.
I was intrigued by the calibration of the standard RJ setup.? While I do not use that setup, I decided to measure what I use for other purposes, including RJ.? So, have a read of the attachment.? I'm using the AirSpy Discovery HF+ to test the linearity.? The system is diagrammed to start and then, I ran an HP generator up by 10 dB steps ultimately into Radio SkyPipe.? I was somewhat disappointed at the non-linear behavior of the system.? Please have a read of the attachment.
CONCLUSION:? Yes, calibration is needed if linear response to the input is required!!!
Dave - W?LEV
|
I was intrigued by the calibration of the standard RJ setup.? While I do not use that setup, I decided to measure what I use for other purposes, including RJ.? So, have a read of the attachment.? I'm using the AirSpy Discovery HF+ to test the linearity.? The system is diagrammed to start and then, I ran an HP generator up by 10 dB steps ultimately into Radio SkyPipe.? I was somewhat disappointed at the non-linear behavior of the system.? Please have a read of the attachment.
CONCLUSION:? Yes, calibration is needed if linear response to the input is required!!!
Dave - W?LEV
|
Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Richard.? Your right. In the SDRc2RSS middle window you will see where the RX888 noise floor is.? It¡¯s probably around -135 or so. In that case you¡¯re going to have to set the dB threshold to -140 or -145 to get out out of the black hole your RSS is in. Then your plot may suffer some but you should then be able to adjust SDRc2RSS gain higher so you can get RSS offset off zero to get some adjustment room to the right. Use RSS gain to set the white bar and RSS offset to set the black end. Even if the plot isn¡¯t perfect you want to get the range of black to white in your spectrograph close. So the spectrographs you share will look right even though the recorded .sps file isn¡¯t well calibrated. You can work on the calibration plot to get your recorded files calibrated later.? Larry
Do you mean to the left?? The problem is that it is already at 0.
?
Richard
|
Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Do you mean to the left?? The problem is that it is already at 0.
?
Richard
|
Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Richard Increase your RSS offset to the right to brighten up the dark end.?
Hi Huub,
?
I worked a bit more on the calibration today, and had a bit more success.? You can see the result in the attached image.? It is a bit closer to linearity than yours, but still a bit flat on the lower end.? Here is what I ended up with:
?
SDRconsole:?
HF attenuation: 0
HF Gain: 20
Visual Gain: -30
?
SDRc2RSS:
FFT Window: None
dB Threshold: -145
Gain: 2.2
?
There is an interesting article on the web:
?
.
?
which discusses the noise floors in different environments.? The Dark Sky Observatory is best described as "quiet rural".? In that case the noise floor may be -130 dB or lower.? In more noisy environments it can be quite a bit higher.? The dB Threshold on SDRc2RSS corresponds to that noise floor, and one should not raise it above the actual noise floor else some faint signals will be lost.? That article suggests that in low noise environments, RX-888 Mk II might benefit from a small amount of RF pre-amplification before the SDR.? Larry Dodd also suggested the same.
?
I am not completely satisfied with this calibration.? These settings result in a very dark background on the RSS output, in some places black.? This may be partially a function of our radio-quiet background at the Dark Sky Observatory.? I think trying out a small amount of pre-amplification is a good idea, and I have ordered an RF pre-amp and will give it a try when it comes.
?
Richard
|
Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Hi Huub,
?
I worked a bit more on the calibration today, and had a bit more success.? You can see the result in the attached image.? It is a bit closer to linearity than yours, but still a bit flat on the lower end.? Here is what I ended up with:
?
SDRconsole:?
HF attenuation: 0
HF Gain: 20
Visual Gain: -30
?
SDRc2RSS:
FFT Window: None
dB Threshold: -145
Gain: 2.2
?
There is an interesting article on the web:
?
.
?
which discusses the noise floors in different environments.? The Dark Sky Observatory is best described as "quiet rural".? In that case the noise floor may be -130 dB or lower.? In more noisy environments it can be quite a bit higher.? The dB Threshold on SDRc2RSS corresponds to that noise floor, and one should not raise it above the actual noise floor else some faint signals will be lost.? That article suggests that in low noise environments, RX-888 Mk II might benefit from a small amount of RF pre-amplification before the SDR.? Larry Dodd also suggested the same.
?
I am not completely satisfied with this calibration.? These settings result in a very dark background on the RSS output, in some places black.? This may be partially a function of our radio-quiet background at the Dark Sky Observatory.? I think trying out a small amount of pre-amplification is a good idea, and I have ordered an RF pre-amp and will give it a try when it comes.
?
Richard
|
Andrew Mount
Larry Dodd
Chuck Higgins
Dave Typinski
Jim Sky
