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Good Day All,
Some solar events, all day long...
Still working on my local setting with SDR Console/SDRC2RSS on getting it cleaned up.? Not quite sure whats causing the High/Low end dropoff. Anyone else has this?
Carl Wasilla AK USA
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Hi Carl.
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Good Work!!
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Salvador
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Carl, maybe I'm off base, but correct me if I'm going down the wrong rabbit hole.?
The SDRPlay and Airspy SDRs can and do scan either 2.0 or 10 MHz.? However, on either end, there is a 1 MHz falloff in response.? So with a 10 MHz setting, you get only 8 MHz of useful data in the plots.??
For example, I presently have a 3-element home brew Yagi pointing straight upward to catch CYG and CASS on 144.096 MHz on a drift scan.? I'm operating an AirSpy Discovery HF+ on the PC using SDR Console.? While it will not do a sweep of 2.0 or 10 MHz, its maximum sweep is ¡À96 MHz.? Here is a screen grab which I just took: Note the fall-off on each end of the sweep.? While it posts ¡À 96 kHs sweep, the bottom and top of the sweep fall off the lower and upper of 40 kHz each in response, so the useful data window is only 112 kHz wide.
So with the SDRPlay and the AirSpy offerings, your useful data window is less than "advertised".? Set for a 10 MHz sweep which I see in your images, the useful window is only 8 MHz wide.?
Dave - W?LEV ?
On Tue, May 13, 2025 at 10:47?AM Carl Pajak Phone via <pajakonice= [email protected]> wrote: Good Day All,
Some solar events, all day long...
Still working on my local setting with SDR Console/SDRC2RSS on getting it cleaned up.? Not quite sure whats causing the High/Low end dropoff. Anyone else has this?
Carl Wasilla AK USA
|
Dave, Thank you for your input.? I will bump up to 10 Mhz bandwidth on my next data set.? I believe I may have done that on the first try, but I may be mistaken.
Kind of miss my SDRpay2RSS...... :)
Thanks again, Carl
Carl, maybe I'm off base, but correct me if I'm going down the wrong rabbit hole.?
The SDRPlay and Airspy SDRs can and do scan either 2.0 or 10 MHz.? However, on either end, there is a 1 MHz falloff in response.? So with a 10 MHz setting, you get only 8 MHz of useful data in the plots.??
For example, I presently have a 3-element home brew Yagi pointing straight upward to catch CYG and CASS on 144.096 MHz on a drift scan.? I'm operating an AirSpy Discovery HF+ on the PC using SDR Console.? While it will not do a sweep of 2.0 or 10 MHz, its maximum sweep is ¡À96 MHz.? Here is a screen grab which I just took: Note the fall-off on each end of the sweep.? While it posts ¡À 96 kHs sweep, the bottom and top of the sweep fall off the lower and upper of 40 kHz each in response, so the useful data window is only 112 kHz wide.
So with the SDRPlay and the AirSpy offerings, your useful data window is less than "advertised".? Set for a 10 MHz sweep which I see in your images, the useful window is only 8 MHz wide.?
Dave - W?LEV ?
On Tue, May 13, 2025 at 10:47?AM Carl Pajak Phone via <pajakonice= [email protected]> wrote: Good Day All,
Some solar events, all day long...
Still working on my local setting with SDR Console/SDRC2RSS on getting it cleaned up.? Not quite sure whats causing the High/Low end dropoff. Anyone else has this?
Carl Wasilla AK USA
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Carl, All,? The bandwidth limitation is primarily your antenna. Receivers, of course, also have a bandwidth limitation.?Broad bandwidth isn¡¯t always a good thing. Great for broad solar events, but not so good for viewing tiny Jupiter events. Jupiter events ¡°tend¡± to be within the 8Mhz bandwidth centered around 20.1 MHz. It¡¯s very similar to optical telescopes. High power usually equals a narrow field of view. Binoculars give a nice wide field of view but make seeing tiny, deep sky objects harder.?There are very wide bandwidth antennas for ALE that work for 3 to 30 MHz, but you miss the small Jupiter signals once it¡¯s squeezed into the RSS-limited spectrograph space.?It all depends on where your interest lies. Wide bandwidth antennas also tend to have less gain. Radio JOVE emphasizes?Jupiter's observations. It¡¯s our namesake. It¡¯s the science our Radio JOVE founders concentrated on. Solar events are stronger, broader, and easier to capture but require a different set of equipment that¡¯s not always ideal for Jupiter observations. All observations are interesting and important from a science perspective. For Jupiter observations, the current Radio JOVE 2.1 observatory (Dual Dipole or the TFD antenna, RSP1B receiver) 8 MHz bandwidth package is an excellent choice for Jupiter observing, and it helps to standardize Jupiter observations between stations.?A vital?science issue often overlooked.?
On Wed, May 14, 2025, at 7:38?AM, Carl Pajak Phone via <pajakonice= [email protected]> wrote: Dave, Thank you for your input.? I will bump up to 10 Mhz bandwidth on my next data set.? I believe I may have done that on the first try, but I may be mistaken.
Kind of miss my SDRpay2RSS...... :)
Thanks again, Carl
Carl, maybe I'm off base, but correct me if I'm going down the wrong rabbit hole.?
The SDRPlay and Airspy SDRs can and do scan either 2.0 or 10 MHz.? However, on either end, there is a 1 MHz falloff in response.? So with a 10 MHz setting, you get only 8 MHz of useful data in the plots.??
For example, I presently have a 3-element home brew Yagi pointing straight upward to catch CYG and CASS on 144.096 MHz on a drift scan.? I'm operating an AirSpy Discovery HF+ on the PC using SDR Console.? While it will not do a sweep of 2.0 or 10 MHz, its maximum sweep is ¡À96 MHz.? Here is a screen grab which I just took: Note the fall-off on each end of the sweep.? While it posts ¡À 96 kHs sweep, the bottom and top of the sweep fall off the lower and upper of 40 kHz each in response, so the useful data window is only 112 kHz wide.
So with the SDRPlay and the AirSpy offerings, your useful data window is less than "advertised".? Set for a 10 MHz sweep which I see in your images, the useful window is only 8 MHz wide.?
Dave - W?LEV ?
On Tue, May 13, 2025 at 10:47?AM Carl Pajak Phone via <pajakonice= [email protected]> wrote: Good Day All,
Some solar events, all day long...
Still working on my local setting with SDR Console/SDRC2RSS on getting it cleaned up.? Not quite sure whats causing the High/Low end dropoff. Anyone else has this?
Carl Wasilla AK USA
--
|
Larry, Very clear and well said. Thank you so much for the refresher!! Carl
Carl, All,? The bandwidth limitation is primarily your antenna. Receivers, of course, also have a bandwidth limitation.?Broad bandwidth isn¡¯t always a good thing. Great for broad solar events, but not so good for viewing tiny Jupiter events. Jupiter events ¡°tend¡± to be within the 8Mhz bandwidth centered around 20.1 MHz. It¡¯s very similar to optical telescopes. High power usually equals a narrow field of view. Binoculars give a nice wide field of view but make seeing tiny, deep sky objects harder.?There are very wide bandwidth antennas for ALE that work for 3 to 30 MHz, but you miss the small Jupiter signals once it¡¯s squeezed into the RSS-limited spectrograph space.?It all depends on where your interest lies. Wide bandwidth antennas also tend to have less gain. Radio JOVE emphasizes?Jupiter's observations. It¡¯s our namesake. It¡¯s the science our Radio JOVE founders concentrated on. Solar events are stronger, broader, and easier to capture but require a different set of equipment that¡¯s not always ideal for Jupiter observations. All observations are interesting and important from a science perspective. For Jupiter observations, the current Radio JOVE 2.1 observatory (Dual Dipole or the TFD antenna, RSP1B receiver) 8 MHz bandwidth package is an excellent choice for Jupiter observing, and it helps to standardize Jupiter observations between stations.?A vital?science issue often overlooked.?
On Wed, May 14, 2025, at 7:38?AM, Carl Pajak Phone via <pajakonice= [email protected]> wrote: Dave, Thank you for your input.? I will bump up to 10 Mhz bandwidth on my next data set.? I believe I may have done that on the first try, but I may be mistaken.
Kind of miss my SDRpay2RSS...... :)
Thanks again, Carl
Carl, maybe I'm off base, but correct me if I'm going down the wrong rabbit hole.?
The SDRPlay and Airspy SDRs can and do scan either 2.0 or 10 MHz.? However, on either end, there is a 1 MHz falloff in response.? So with a 10 MHz setting, you get only 8 MHz of useful data in the plots.??
For example, I presently have a 3-element home brew Yagi pointing straight upward to catch CYG and CASS on 144.096 MHz on a drift scan.? I'm operating an AirSpy Discovery HF+ on the PC using SDR Console.? While it will not do a sweep of 2.0 or 10 MHz, its maximum sweep is ¡À96 MHz.? Here is a screen grab which I just took: Note the fall-off on each end of the sweep.? While it posts ¡À 96 kHs sweep, the bottom and top of the sweep fall off the lower and upper of 40 kHz each in response, so the useful data window is only 112 kHz wide.
So with the SDRPlay and the AirSpy offerings, your useful data window is less than "advertised".? Set for a 10 MHz sweep which I see in your images, the useful window is only 8 MHz wide.?
Dave - W?LEV ?
On Tue, May 13, 2025 at 10:47?AM Carl Pajak Phone via <pajakonice= [email protected]> wrote: Good Day All,
Some solar events, all day long...
Still working on my local setting with SDR Console/SDRC2RSS on getting it cleaned up.? Not quite sure whats causing the High/Low end dropoff. Anyone else has this?
Carl Wasilla AK USA
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Carl Pajak Phone
salvador aguirre
Larry Dodd