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Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Hi Richard,
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I agree, bringer the attenuation to 20 dB will reduce sensitivity. But in this case I was trying to reach the full dynamic range. I'm sure there is a way to find the sweet spot between sensitivity and dynamic range through tinkering with the settings. As I said, it's a start.
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Attached you'll find an image of the full spectrum of the rx888 (3 to 60 MHz). As you can see, the part ~18 - 30 MHz shows very little signal. I'm not sure yet if this is due to my antenna or the rx888. Tomorrow I'll do a calibration on the lower part of the band span and see if this changes things.
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Huub
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Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Richard, The dB threshold in SDRc2RSS setting controls the?noise floor. For most Radio JOVE purposes keep it as low as possible (-150 dB). Thanks. Larry K4LED _______________________ On Sun, May 18, 2025 at 12:13?PM Richard Gray via <grayro=[email protected]> wrote:
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Re: Solar and RF fadeout North Tasmania, Australia
Sabine, Luke is using SDRc2RSS. It has a pull down list of ¡°Windowing¡± like filters. While using these filters can remove certain artifacts in a spectrograph they do so based on the fixed filter parameters. There is no operator control over what artifacts are removed other than knowing what the selected fixed filter filters. This is why I recommend turning Windowing or Filtering off especially when calibrating the system because they slightly alter the spectrograph signal. Perhaps eventually a smart AI filter could be more intelligently effective than current fixed filters. In the meantime finding and avoiding RFI, while unfortunate and difficult, is the best solution.? Thanks.? Larry K4LED _______________________ On Sun, May 18, 2025 at 10:16?AM Sabine Cremer via <sc=[email protected]> wrote:
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Re: Solar and RF fadeout North Tasmania, Australia
Luke,
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a quick side note: Your spectrogram looks like the FFT is working without windowing. If this is SDRPlay2RSS generating the spectra, please enable "Windowing" in the "Integrate" menu. You'll get a much clearer spectrogram then.
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Sabine
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Re: Views of the Solar "Storm" from the Dark Sky Observatory May 13, 2025
Hi Richard,
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So I did a calibration today with the following results. (see images)
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For RSS: (forgot to take a screenshot)
color offset: 0
gain: about 1.2
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Not the most pretty curve I have to admit but I guess that's how the RX888 MKII behaves.
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It's a start and maybe by tweaking the values you can get a better result.
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Huub |
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Update to "RX888 On SDR Console, SDRc2RSS", and RSS Documentation
FYI The 1/29/2025 pdf document "RX888 On SDR Console, SDRc2RSS and RSS" was updated 5/17/2025 and is attached below. The Chinese RX888/RX888 MKII is fabricated by several different manufacturers in China. Some are just clones or redesigned SDRs. A totally new design is in progress to correct known issues such as overheating, PCB runs too close together, and other design issues, etc. As with some eBay items, you never know what your going to get. The RX888/RX888 MKII as well as other SDRs may be used with SDR Console and SDRc2RSS and RSS on an experimental basis. The RSP1B calibration process can only be used as a guide. Calibration accuracy cannot be guaranteed. ?For an accurately calibrated spectrograph the Radio JOVE supported SDRplay RSP1 or RSP1B are suggested. Thank you. Larry K4LED |
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Re: Solar and RF fadeout North Tasmania, Australia
Luke, Yes that's a good practice. Good that you have that resource close by. Stations farther away may have a different view. I run a Live 24/7/365 youtube feed from an RSP1B on a four section TFD array by Dave Typinski. Its at: Its located about 40 miles north of Atlanta Georgia USA. I have a YouTube channel that may be of interest also. youtube K4LED: Thanks Luke?for?sharing your observations on Radio JOVE.? Larry K4LED _______________________ ? On Fri, May 16, 2025 at 6:33?PM Luke Murphy via <lukepmurphy=[email protected]> wrote:
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Re: Solar and RF fadeout North Tasmania, Australia
¿ªÔÆÌåÓýThank you, Larry ? I will often compare my observations with data from Learmonth (relatively nearby) to at least corroborate them. In this case the comparison is quite interesting. I was hoping to compare to 18GHz range from Owens Valley as well, unfortunately no data is available for that period. ? Kind Regards, ? Luke. ? ? ? From: [email protected] <[email protected]> On Behalf Of Larry Dodd via groups.io
Sent: Thursday, May 15, 2025 1:26 AM To: [email protected] Subject: Re: [Radio JOVE] Solar and RF fadeout North Tasmania, Australia ? Luke, Very interesting observation Luke. Your microscopic 8 Mhz spectrograph shows a lot of detail missing in the extremely wide bandwidth Learmouth spectrograph. The solar event at a very high frequency (-100Mhz) is centered on the HF fade out shown in your spectrgtoph and at the bottom of the Learmouth spectrograph. Your observation is an excellent example of comparing a narrowbandwidth to an extremely wide bandwidth.? Thank you for your observation. Larry K4LED _______________________ ? ? ? On Wed, May 14, 2025 at 8:30?AM Luke Murphy via <lukepmurphy=[email protected]> wrote:
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Larry Dodd
Sabine Cremer
Carl Pajak Phone
