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Re: Weather Satellite Operation
Alan G4ZFQ
On 25/08/2022 06:45, George Stein - NJ3H via groups.io wrote:
The best reception I have is with SDRC and the Elad S2. When I usemy Airspy R2, HF+ discovery, or RSPdx with SDRC or their native software, there is basically no reception. Maybe the Elad is the only one that is not overwhelmed by strong broadcast signals? I find a filter to be useful on many receivers. 73 Alan G4ZFQ |
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Re: Weather Satellite Operation
Hello Gert,
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Yes I do gave 40 KHz set for each receiver. I am glad you have a setup that works well for you. Thank you for your message. Regards,
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Re: Weather Satellite Operation
Gert Gremmen
Hi George Just a simple suggestion question : are all bandwidths set to the
same value (35-40 kHz) ? Check by noise floor level. Must be the
same. You will probably get not much of a benefit with an preamp, unless if used for cable length compensation. Most important is a good antenna, high placed (i build a helix)
because of ground reflection nulls. I used the dedicated receiver from EMGO of which i replaced the
input circuit by a helical tuned circuit with a BF981. The excellent selectivity got me rid of the all kind of
interference from the airbands, without notable loss of signal quality (the helix add -6 dB of
loss). Gert On 25-8-2022 8:45, George Stein - NJ3H
via groups.io wrote:
Greetings,-- Independent Expert on CE marking EMC Consultant Electrical Safety Consultant |
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Very high CPU load with the AirSpy mini
#airspy
Hi, I've noticed a cpu load of over 80% using my AirSpy mini with the newest console beta running under Win10 64bit on my ASUS ZenBook UX305CA. Any ideas, how to minimize CPU load?
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Re: Weather Satellite Operation
I should have mentioned that the three radios in question are working fine the Broadcast FM band, the amateur vhf/uhf bands, and other services on vhf/uhf. I is just the satellite reception that is giving me fits.
Also I have played with the gain settings in the software packages as well. Thanks |
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Weather Satellite Operation
Greetings,
I am having a strange happening in trying to listen to the NOAA weather satellites. The best reception I have is with SDRC and the Elad S2. When I use my Airspy R2, HF+ discovery, or RSPdx with SDRC or their native software, there is basically no reception. Is the Elad that much better than the other receivers. I am surprised that I am seeing such a disparity in signal strengths. My antenna is a circular dipole from Stellar designed for the FM broadcast band. I am using this very non-perfect antenna until I buy a QFH antenna and a preamp. Any ideas as to why the other radios seem to be a disappointment? Another question: The Orbitron/WXtoIMG software can create a list of upcoming passes for the satellites that the user wants to select (days into the future). This then allows unattended operation for decoding upcoming passes. Is there a similar capability within SDRC to create such a list, feed it to WXtoIMG, allowing unattended decoding? In other words, this would eliminate the need for Orbitron and use the satellite module within SDRC to handle this function. I very much like the satellite module that Simon has developed. Being able to use it as described above would free up one program. To be honest, I was hoping to dedicate my Airspy R2 to weather satellite duties. As mentioned above, this is not looking good. So any ideas and comments to the items raised in this message will be greatly appreciated. Regards, George |
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Re: Using SDRC to analyse Kiwi recordings
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From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of david via groups.io <zinc65@...>
Sent: 24 August 2022 14:30 To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> Subject: Re: [SDR-Radio] Using SDRC to analyse Kiwi recordings Hi Simon,
Thanks for the rapid response. I've uploaded a file to a dropbox account, and sent you a link. Thanks for the great software. David, GM8XBZ -----Original Message----- From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown Sent: 24 August 2022 11:14 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Using SDRC to analyse Kiwi recordings You need to give me a Kiwi recording in a ZIP on the cloud. Simon Brown https://g4eli.com https://sdr-radio.com -- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems. |
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Re: Using SDRC to analyse Kiwi recordings
david
Hi Simon,
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Thanks for the rapid response. I've uploaded a file to a dropbox account, and sent you a link. Thanks for the great software. David, GM8XBZ -----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown Sent: 24 August 2022 11:14 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Using SDRC to analyse Kiwi recordings You need to give me a Kiwi recording in a ZIP on the cloud. Simon Brown https://g4eli.com https://sdr-radio.com |
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Re: Afedri AFE822X dual channel Diversity/phasing support?
Hi Simon,
FYI, I am including a link to a post that describes what has been done by oh7aeg (using 4 channel Afedri): https://github.com/AlexandreRouma/SDRPlusPlus/discussions/585 Me personally, I am interested in stereo diversity reception but it seems there are multiple applications of having a coherent multi-channel receivers. Of course, one can't do everything at once, but at least something to keep in mind when beginning to implement multi-channel support. Cheers, Chav/lz1abc P.S. More hints below: - Link to a pdf with additional description from oh7aeg: https://www.oh3ad.fi/wp-content/uploads/2022/07/Vaiheohjattu2.pdf - Screenshot from the pdf showing how he implemented beam switching in "SDR Network Control Box" ScreenShot |
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Re: Using SDRC to analyse Kiwi recordings
You need to give me a Kiwi recording in a ZIP on the cloud.
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of david via groups.io <zinc65@...>
Sent: 24 August 2022 10:05 To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> Subject: [SDR-Radio] Using SDRC to analyse Kiwi recordings Hello All,
The Kiwi SDR network is an excellent resource for looking at DX signals from a 'local' receiver. As well as 'live' listening, you can make a recording, using the 'IQ' icon. Then, you can study the recording at your leisure. The recording is only about 12kHz wide, but that is fine for digital signals. You can playback the recording using SDRConsole, but that software loses the Frequency information, and only shows a +/- 6kHz spectrum with a 'Zero ' centre. Is there already a way to preserve the original recording frequency, or do we need to talk nicely to "The Master"? Best Wishes David, GM8XBZ -- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems. |
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Using SDRC to analyse Kiwi recordings
david
Hello All,
The Kiwi SDR network is an excellent resource for looking at DX signals from a 'local' receiver. As well as 'live' listening, you can make a recording, using the 'IQ' icon. Then, you can study the recording at your leisure. The recording is only about 12kHz wide, but that is fine for digital signals. You can playback the recording using SDRConsole, but that software loses the Frequency information, and only shows a +/- 6kHz spectrum with a 'Zero ' centre. Is there already a way to preserve the original recording frequency, or do we need to talk nicely to "The Master"? Best Wishes David, GM8XBZ |
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Re: Anyone seen/heard this on WWV?
Here's an edited (shortened) movie with audio clip of the various test waveforms:
73 Kriss KA1GJU |
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Re: Anyone seen/heard this on WWV?
David L. Wilson
There was a post about this 2 months ago in the reddit signalidentification forum (a good place to watch):
https://www.reddit.com/r/shortwave/comments/vqa2ye/i_picked_up_some_frequency_swipes_from_wwv_5mhz/ Also, see: https://www.nist.gov/pml/time-and-frequency-division/time-services/wwvwwvh-scientific-modulation-working-group |
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SDR SHARP FM co-channel canceler
Paul Cianciolo
Hello all,
This video demonstrates the FM co-channel canceler tool built into SDR# software program. Youtube will not allow me to show you some of the most dramatic examples as they would be music and violate copy right protection laws. An amazing tool Thank you Youssef https://youtu.be/FvshoNfv3ag Thank you W1VLF |
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Re: Frequency Database Station Order
Ken Sejkora
Hello again, Jim,
No luck with getting a Custom.CSV file to accomplish our desired goals. I was able to create a Custom.csv file, which I could then open with Excel and perform additional sorting options to list stations in order of increasing distance as opposed to Station ID, and then save the resulting file with the re-ordered station list. However, once you ‘import’ that file into SDRC and ‘add’ the records to the database, that operation of ‘adding’ the information results in a FrequencyDatabase_001.xml that re-orders the list by frequency and Station ID. I can’t seem to get around that SDRC reordering operation.
Upon investigating the FMLIST and MWLIST files created by the fmscan.org website, I made some interesting observations. As mentioned in my earlier email, both files perform a primary sort by frequency, and a secondary sort by some predicted signal strength, strongest stations first. I’d be interested in knowing how the predicted signal strength is calculated. I suspect that distance/proximity comes into pay, as well as station power or ERP. However, the sorting by signal strength even occurs with stations that don’t even list a power or ERP value. Perhaps the fmscan.org file generator assumes some minimal power level for those stations that don’t include a power value. Regardless, the signal strength values calculated in the fmscan.org FMLIST and/or MWLIST files are *not* carried over into the SDRC database file. Only the distance and station power/ERP values are carried over.
Another observation regarding the FMLIST and MWLIST intermediate files. In both files, the estimated signal strength is captured into the 14th data field, Column N, in terms of dB(?) units. The higher dB levels take precedence in the secondary sorting that occurs in these files. However, in the case of the FMLIST file, the dB values appear to always start with a small value and progress into negative dB values, whereas in the MWLIST intermediate file the signal strength has positive dB values. For example, a strong 5.2 kW FM station that is located only about 2.5 miles (~4 km) from my house has a predicted signal strength of 1 dB in FMLIST while the subsequent entries for the same frequency are all negative values dropping down to -38 dB for the last entry (1 kW at 1428 km) for that frequency. However, in the MWLIST intermediate file, all of the signal strength values appear to be positive, with a nearby moderate strength AM BCB station (a station with an ERP of 1 kW at a distance of 28 km) having a predicted strength of +72 dB, with the last entry for that frequency (a station with an ERP of 0.25 kW at a distance of 8190 km) having a predicted signal level of +47 dB. I realize that one cannot necessarily equate signal levels in SDRC to those in the database, but the nearby 5.2 kW FM station at 4 km away has an SDRC peak signal strength of -72 dBm (predicted by fmscan.org at 1 dB) , while the 1 kW AM station 28 km away yields an SDRC signal of -53 dBm (predicted at +72 dB). Clearly, there is a disconnect with how the predicted signal strength is calculated in each file.
Bottom line – I can’t seem to create an SDRC FrequencyDatabase.XML that lists station sin order of decreasing signal strength or increasing distance. I’ll keep digging, but wanted to report the unsuccessful attempts thus far. I guess I need to get a bit more aggressive in tweaking the SDRC database file.
Cheers,
Ken -- WBØOCV
From: Ken Sejkora
Sent: Sunday, August 21, 2022 03:34 PM To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Frequency Database Station Order
Thank you, Jim. I know when you import data from fmscan.org, the SDRC database prefers ERP, but I don’t see how it gets used in the SDRC database. The ‘Power’ column appears to reflect the station power in kilowatts rather than ERP.
I investigated the structure of the MWLIST and FMLIST csv files, and it appears the secondary sorting after frequency is based on the value in the 14th field (Column N). Stronger stations have a higher value. Perhaps one could re-sort the SDRC Frequency Database in a similar manner, but again, it doesn’t seem that the corresponding signal strength data are imported into the Frequency Database from the fmscan.org files.
Perhaps I’ll try to experiment with a Custom.CSV file to see if I can accomplish what I want.
Ken
From: Jim Smith G0OFE
It has come up before... I remember asking if the list could be ordered by frequency then distance for VHF FM work - but I think I
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Re: Anyone seen/heard this on WWV?
Jerry Lofstead W3CDE
Larry , you are an amazing trove of information!! Thanks for the info , I love your web site, another treasure. 73, Jerry On Mon, Aug 22, 2022 at 1:28 PM Larry Dodd <101science@...> wrote:
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Re: Anyone seen/heard this on WWV?
Ken Sejkora
It appears that NIST is interested in having people make I/Q recordings of the signal and submitting them via the following website to assist in their research efforts:
Ken -- WBØOCV
From: Larry Dodd
Sent: Monday, August 22, 2022 01:28 PM To: main@sdr-radio.groups.io Subject: Re: [SDR-Radio] Anyone seen/heard this on WWV?
Hi Jerry,
This WWV test signal was created to assist in ionospheric research, and is a joint effort of the Ham Radio Citizen Science Investigation (HamSCI) and NIST. The signal consists of various tones, chirps, and Gaussian noise bursts. The signal may be modified occasionally.
I have a HamSci Grape I receiver and it’s part of a Hamsci project of studying the ionospheric Doppler effect on WWV signal propagation. The WWV test signal is varied from time to time so it’s different depending on their study requirements. Hope this clears up the mystery.
Larry K4LED
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Re: Anyone seen/heard this on WWV?
Ken Sejkora
That’s very interesting. I wonder how they put the word out in order to get the amateur scientist community to assist in their research? This is the first I’ve heard of this, and although this discussion group has a lot of members, this discussion doesn’t reach a huge audience.
I’ll try to catch it at the next 8:00 past the hour, perhaps even try to record and audio signal. It might be helpful if others can do the same and post a link to what the audio from the posted waterfall actually sounds like.
Ken -- WBØOCV
From: Larry Dodd
Sent: Monday, August 22, 2022 01:28 PM To: main@sdr-radio.groups.io Subject: Re: [SDR-Radio] Anyone seen/heard this on WWV?
Hi Jerry,
This WWV test signal was created to assist in ionospheric research, and is a joint effort of the Ham Radio Citizen Science Investigation (HamSCI) and NIST. The signal consists of various tones, chirps, and Gaussian noise bursts. The signal may be modified occasionally.
I have a HamSci Grape I receiver and it’s part of a Hamsci project of studying the ionospheric Doppler effect on WWV signal propagation. The WWV test signal is varied from time to time so it’s different depending on their study requirements. Hope this clears up the mystery.
Larry K4LED
_______________________
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Re: Anyone seen/heard this on WWV?
Hi Jerry,
toggle quoted message
Show quoted text
This WWV test signal was created to assist in ionospheric research, and is a joint effort of the Ham Radio Citizen Science Investigation (HamSCI) and NIST. The signal consists of various tones, chirps, and Gaussian noise bursts. The signal may be modified occasionally. I have a HamSci Grape I receiver and it’s part of a Hamsci project of studying the ionospheric Doppler effect on WWV signal propagation. The WWV test signal is varied from time to time so it’s different depending on their study requirements. Hope this clears up the mystery. Larry K4LED _______________________ On Aug 22, 2022, at 1:09 PM, Jerry Lofstead W3CDE <glofstead@...> wrote:
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Re: Anyone seen/heard this on WWV?
Jerry Lofstead W3CDE
the womans voice is from HAWII JERRY W3CDE On Mon, Aug 22, 2022 at 12:45 PM Calder Latham <calder_b@...> wrote:
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