Find research datasets worth reusing

opencc-by-4.0Sep 2019View details →

WWV Centennial Trial Run Recordings of WWV during August 1st, 2019 UTC

Trial run recording on August 1st 2019 in preparation for the Festival of Frequency Measurement, a component of the celebrations of WWV's 100th anniversary.   The Festival of Frequency Measurement is a citizen-science component of WWV's 100th anniversary celebration. This data set was collected on August 1st, 2019 UTC as a trial run for the centennial celebrations.

01OCT2019 5 MHz WWV

Festival of Frequency Measurement Submission —- event: WWV Centennial UTC date:   235411 30SEP2019 (start) beacon frequency: 5 MHz   station name: W6MSU latitude and longitude and/or maidenhead grid square:  CM98hb city: Stockton state or region: California   Difficulties had:  Latest version of fldigi   Anything you know about the stability of your equipment: Flex 1500 with Symmetricon GPSDO   soapbox: Thank you for the test. 73

WWV Centennial Recording of WWV 5 MHz from Western PA, U.S.A.- NA0B

Festival of Frequency Measurement 1 October 2019 UTC Date 20191001 Beacon Frequency: 5.000.000 Station Name: NA0B Latitud: 40.30.950 N Longitud: 79 55.353 W Grid: FN00am City: O'Hara Township, PA SF=69, A=12, K=1 at the end of measurament Equipment: Flexradio FLEX-6000M with GPS module, 24 hours warm up SW: fldigi 4.1.08 Released publicly under Creative Commons: YES

WWV Centennial Frequency Measurement

Radio is a ICOM IC 7610    fldigi version 4.0.18 grid EN16aw Stopped data collection at 23:15.  The station was needed as the operator was Net Control for the North Dakota Evening net.

WWV 5 Mhz reception in Port Huron, Michigan, USA on 1/October/2019

Festival of Frequency Measurement 1 October 2019 Event:  WWV Centennial UTC date:  2019/October/01 Beacon frequency: 5 MHz Michael Naruta - AA8K Location:  42.9960515N 82.4643026W 156.417m, grid EN82sx, near Port Huron, Michigan, USA, Zip code 48060. Start time:  15 minutes before 1/October/2019 UTC End time:  2 hours after 1/October/2019 UTC Antenna:  BiggIR vertical, 10 meters high, with 33 ground radials, each 10 meters long.  Omni-directional. Receiver:  OpenHPSDR Mercury with Alexis bandpass filter.  Software:  PowerSDR OpenHPSDR mRX PS v3.38 (6/9/16), Virtual Audio Cable 4.13.0.5811, Fldigi 4.1.08, MS Windows 10 Home 1809. Frequency reference:  Trimble Thunderbolt GPSDO.  Mercury locked to reference.  Personal computer sound card not locked to reference and may have a higher error.  Devices located in a basement that does not experience wide temperature swings. Measurement procedure:  PowerSDR set for USB with a frequency of 4.999 MHz.  Bandwidth filters set to 950 Hertz and 1050 Hertz, yielding a 100 Hertz bandwidth centered on the 1,000 tone generated by the WWV 5 MHz carrier.  Some difficult initially configuring VAC and Fldigi.  Normally use Spectrum Lab.  Fldigi ran in 'frequency analysis' with data collected into a .csv file.

WWV October 1st UTC 5 MHz Frequency Measurment from Prosser, WA

station name: N7QNM grid square: DN06ce city and state: Prosser, WA 99350 equipment: Elecraft K3 Factory Calibration HyGain AV18HT (Omni Vertical) beacon frequency: 5MHz

opencc-by-4.0Aug 2017View details →

WWV calibration data from Piradar

Piradar in Hamilton Branch State Park, South Carolina with non-resonant 200 ft. tip-to-tip dipole. Using WWV recordings as a performance reference.

WWV 10 MHz Doppler Recording, AD8Y

10 MHz data collected by AD8Y during 2020 and 2021. Details at www.hamsci.org/grape1. Timelapse available here: https://www.youtube.com/watch?v=U-0qZsqzNFE

KD8CGH Grape 1 WWV 10 MHz

KD8CGH, node N0000022 Grape 1 WWV 10 MHz 143 .csv files from  21-06-28 to 22-01-01

WWV and CHU Eclipse Frequency Measurement

Recordings of WWV (2.5 MHz, 5.0 MHz) and CHU (3.33 MHz) for the December 2021 Eclipse Festival of Frequency Measurement Name, Callsign: William Breidenthal, KE6XO Latitude and Longitude: 40°03'33"N 105°12'32"W   Elevation: 1564 meters Start time of the analysis: November 31, 2021 07:04:56 UTC Stop time of the analysis: January 12, 2022 08:00:00 UTC GPSDO: Yes Hardware Description: <ul> <li>Antenna: MLA-30+ Magnetic Loop</li> <li>Antenna pointing direction: North/South</li> <li>Receiver Type: Ettus Research USRP2 with BasicRX Daughterboard</li> <li>Frequency reference type: GPSDO 10 MHz (Masterclock MCR1000)</li> <li>Frequency Measurement Technique:<a href="https://github.com/ccera-astro/wwv_doppler"> ccera-astro/wwv_doppler</a> with GNU Radio</li> </ul> Notes: Measurements recorded 70 km away from WWV in Boulder, CO. Some data is missing due to power outages. wwv_doppler was modified to add a 3rd channel to simultaneously record CHU.

WWV Centennial Event

Festival of Frequency Measurement 1 October 2019 Greg Davidson VE6GRT Location Alberta Canada 51.13 -114.62 Start time 22:00 Sept 30, 2019 UTC Both WWV 5.0 Mhz and WWV 10 Mhz recorded. Hardware:  SDRPlay-2 Receiver, Local Oscillator 6.2 Mhz, 8 Mhz bandwidth, allowing simultaneous recording of WWV 5 and WWV 10 Mhz Antenna - 120 meter horizontal loop, 10 meters above ground Fequency Reference, Calibrated to WWV 10 Mhz and WWV 15 Mhz.   Calibration Error - WWV 5.0, 0.5 Hz low,  WWV 10.0, 3.2 Hz high Frequency Measurement, Fldigi in parallel with homebrew software. Two methods provide same frequency result, homebrew software also records 50 Hz spectral range (1 per minute) around 1000 Hz carrier. Difficulties: 3 minute frequency error (spike) at 22:31 Sept 30, 2019 due to tuning test. Temperature drift due to abnormal cold spell during test, induced error is about 05.Hz arising from 2 degree temperature change. The included file `VE6GRT_Temperature_Effect.docx`` documents the error induced due to temperature.

WWV 5 MHz fom EM74vc

Festival of Frequency Measurement 1 October 2019 Jim Farmer, K4BSE  EM74vc Started recording 20 Sept. 23:29:12, went well past the end of the day because I wasn't home to stop it earlier.  Decided to send all, so didn't cut it. Antenna was a G5RV modified to favor WARC bands.  It gave a bit better performance than my 80M inverted VEE.  Receiver was K3 tuned to 4.999 MHz, USB.  It is stabilized by a GPS disciplined oscillator.  GPSDO had been running for months with no known interruptions.  RX had run for about 5 hours before the measurement period.  RX was set to a bandwidth of about 400 Hz centered on the 1 kHz beat.  The AGC seems to respond to what is in the total IF passband, not what comes through the crystal filter.  The receiver fed a SignalLink USB, feeding an HP laptop.  WWV calibration shortly before the start of the measurement period showed no significant frequency error.  HP laptop was running the current release of fldigi. The large anomalies started around noon local time.  There was no discernable signal in the speaker then. Enjoyed taking part.  Thanks; I had wondered what the WWV and Measurement modes in fldigi did - information is hard to come by.

Fldigi file from WWV observation at 5MHz

Festival of Frequency Measurement 1 October 2019 Date and time of each measurement is included in the file. Radio is a Flexradio 5000A, which had been running continuously for 4 days in a temperature controlled room. Antenna is an inverted-V dipole cut for the amateur 60m band. Main difficulty was the weakness of the WWV signal for a period of about 4 hours in the early afternoon (1900z - 2300z). I hope the information is of use.

Recording of WWV 5 MHZ from Longmont, CO

Event: WWV Centennial Festival of Frequency Measurements UTC Date: 20190801 Beacon frequency: 5.000 000 Station Name: K0ANS Latitude: 40.16290 N Long: 105.11797 W Grid: DN70kd City: Longmont, CO Difficulties had: My equipment has a observed frequency error of about 1 ppm when warmed up. Equipment: Yaesu FT-817ND with TCXO; warm-up started at about 23:00 SW: fldigi ver 4.1.08 Soapbox: I'm happy to participate. This close to WWV, I expect to receive either ground wave or NVIS.

opencc-by-4.0Sep 2019View details →

AG7PQ WWV Frequency Measurement Oct 1, 2019 UTC

Festival of Frequency Measurement 1 October 2019 <ul> <li>Gregory Weatherford - AG7PQ</li> <li>47.74, -122.34</li> <li>23:41.05 September 30, 2019</li> <li>Station type <ul> <li>40m Dipole Antenna</li> <li>East/West pointing direction</li> <li>Icom 7300</li> <li>5 MHz (1000 Hz tone)</li> <li>FLDIGI</li> </ul> </li> </ul>

opencc-by-4.0Sep 2019View details →

N8OBJ WWV Data Receprion for 5 MHz

Using home station of RasPi3B, custom receiver, Leo Bodnar GPSDO, my modified FLDigi analysis package

opencc-by-4.0Oct 2022View details →

WWV Time of Flight Example Files

These are sample files for time of flight measurement.    example_second.csv The file example_second.csv includes one second's worth of data taken at a 512 /s sampling rate. The file encompasses 512 samples spaced linearly in time throughout that second. Each of the 512 entries in the file is one sample of the audio voltage taken by a 10-bit A/D converter, with values from 0 to 1023 mapped linearly to the range of minimum to maximum measurable voltage: i.e., for an audio range of -1.5 to 1.5 volts, a value of 0 is equivalent to a value of -1.5V, a value of 512 is equivalent to 0V, and a value of 1023 is equivalent to a value of 1.5V. Second_ticks_20220908 This file contains one day's worth of ToF measurements.  The date of recording is included in the filename. The metadata at the beginning of the file contains the receiving station callsign; the transmitter frequency; and the Maidenhead grid square of the receiving station. Each row of the .csv file contains the second tick measurements for one second of the UTC day. Only the first 24 ms after the start of the second are recorded. (At the location of the receiving station, AD8Y, used for these measurements, this is an adequate length of time to capture the second ticks; elsewhere, longer recording may be needed.) The values of each row then follow the same convention listed above. Ionospheric variability may be visualized by creating a heatmap of these values with a divergent colormap. Second_ticks_20221008 This file contains one day's worth of ToF measurements which show a coronal mass ejection.

zenodo32/100

WWV 2.5 MHz Carrier Data from AD8Y - 2020-2022

Missing data between 7 July 2020 and 20 July 2020 due to upgrade.

zenodo32/100

WWV Centennial measurements 10MHz at the University of Michigan

Description included in the zip as a text document.

zenodo32/100

10 MHz reference CW measured same as 5 MHz WWV

This is a supplement to file K4BSE 34.124 -84.203 5 MHz.csv submitted last week, just after the frequency measurement period.  I'd wondered about some jumps in frequency error I saw in my earlier submission (see xlxs file attached of the original frequency measurement run), so in this test I measured frequency error in exactly the same way, except that I was measuring a 10 MHz signal from a rubidium stabilized frequency source.  The receiver was still stabilized by a GPSDO.  I see some similar-magnitude frequency jumps here (note change in vertical scale).  Also some frequency drifts is seen between some of the jumps, consistent with frequency drift in the test data submitted previously.  I presume the jumps are due to the frequency calibration jumps in the K3's local oscillator.  As best I can tell, the frequency of the K3 in the locked mode is determined by measurement of the frequency of an external 10 MHz oscillator, which is then used to calculate a correction to the tuned frequency of the radio.  The jumps of a fraction of a Hz are consistent with the stated frequency accuracy of the radio when locked to a good reference (eg., the GPSDO used).