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45 results for “WWV”
W0TBR April 2024 Eclipse WWV Doppler Shift
<h2><strong>April 2024 Solar Eclipse Data via W0TBR</strong></h2> <p>W0TBR recorded Doppler drift of 15MHz WWV/WWVH carrier signals prior to and subsequent to the April 8 2024 solar eclipse.</p> <p>Although the W0TBR station was not in the direct path of the solar eclipse - with about only 33% occlusion at maximum shadow - the Doppler shift was recorded to determine any effect as compared to other shifts to be recorded within the direct eclipse path or within the midpoint of the signal path between WWV/WWVH and the recording station.</p> <p>W0TBR is located in Grid CN85qn - Lat. 45.555N & Lon. 122.623W at an elevation of 68.5m ASL.</p> <p>Antenna used is dual band inverted V fan dipole resonant on 20 and 17 meters with an apex at 10 meters above average terrain and tuned for max signal at 15MHz.</p> <p>Antenna feed is terminated at each end with 1:1 balun to minimize noise and non-resonant effects.</p> <p>Radio used is a Flex 1500 SDR stabilized with a 10MHz OCXO. Radio was tuned to 14.999MHz USB with AGC deactivated and RF gain fixed at value of 45/100.</p> <p>Received +/- 1kHz signal was directly fed through Conexant audio chip of HP 600G3 computer into Spectrum Lab (SpecLab) software.</p> <p>SpecLab (V 2.99 b15) was configured similar to that used by WA9VNJ for the 2017 solar eclipse recordings: 512K FFTs with 75% overlap resulting in readings every 12 seconds.</p> <p>SpecLab time, peak frequency and amplitude data were recorded from 0143 UTC to 2359 UTC on April 08 2024 and saved to a text file.</p> <p>Screen shots of the frequency shifts (+/- 3Hz) were taken each two hours for a total of six hours around the local maximum solar shadow which began about 1733 UTC, peaked at about 1825 UTC and ended about 1919 UTC. Note that the original SpecLab screenshots are in vertical time orientation; in order to provide a comparable view where time is on the horizontal axis the views are inverted and ‘stitched’ together for the final view’s full six hour period.</p>
WWV Doppler Shift Recording by AD8Y, 2.5 MHz, no GPSDO
<p>Doppler shift data from WWV on 2.5 MHz.</p> <p><strong>Callsign:</strong> AD8Y</p> <p><strong>Radio:</strong> Icom 7610</p> <p><strong>GPSDO:</strong> No</p> <p><strong>Antenna: </strong>Dipole, shorter than 1/2 wavelength.</p> <p><strong>Coordinates:</strong> (41.4067594 -75.6675467)</p> <p><strong>Elevation:</strong> 914.8 feet</p> <p> </p> <p>This dataset is part of the Frequency Analysis Network project, collected according to the same process as the data for the Festival of Frequency Measurement (10.5281/zenodo.3707210). </p>
WWV Doppler Shift Recording by AD8Y, 5 MHz, no GPSDO
<p>Doppler shift data from WWV on 5 MHz.</p> <p><strong>Callsign:</strong> AD8Y</p> <p><strong>Radio:</strong> Kenwood TS-450</p> <p><strong>GPSDO:</strong> No</p> <p><strong>Antenna:</strong> Random wire vertical</p> <p><strong>Coordinates:</strong> (41.4067594 -75.6675467)</p> <p><strong>Elevation:</strong> 914.8 feet</p> <p><strong>Notes:</strong> The TXCO is intermittently calibrated against a GPSDO, but the system cannot be run off the GPSDO because signal leakage from it overwhelms the signal from WWV. Data collection was interrupted on some dates, including 31 December 2019 and 16 January 2020. </p> <p> </p> <p>This dataset is part of the Frequency Analysis Network project, collected according to the same process as the data for the Festival of Frequency Measurement (10.5281/zenodo.3707210). </p>
December 2021 Eclipse Monitoring of WWV at 5 MHz and 10 MHz by K1FR Using FlexRadio 6700/GPSDO and fldigi
<p>This dataset contains observations of WWV at 5 and 10 MHz gathered from December 1 through 10, 2021 as part of the study of the effects of solar eclipses on the ionosphere. The data was collected by amateur radio station K1FR located at 38.828, -77.104 using a FlexRadio 6700 with GPSDO connected to a long wire antenna. The fldigi application was used to analyze and record the received frequency of the WWV station at one second intervals. The dataset includes .CSV files of these measurements.</p> <p>Three independent receivers were created within the 6700 - one for 5 MHz and two for 10 MHz. The first two receivers' data are included in this dataset. Files named analysis_xxxxx-K1FR-1 are for 10 MHz, and those named analysis_xxxxx-K1FR-2 are for 5 MHz. The third independent receiver was used to capture realtime audio from WWV at 10MHz which will be included in a separate dataset.</p>
December 2021 Eclipse Monitoring of WWV at 10 MHz by K1FR Using FlexRadio 6700/GPSDO and Audacity
<p>This dataset contains observations of WWV 10 MHz gathered from December 1 through 10, 2021 as part of the study of the effects of solar eclipses on the ionosphere. The data was collected by amateur radio station K1FR located at 38.828, -77.104 using a FlexRadio 6700 with GPSDO connected to a long wire antenna. The Audacity application was used to record the realtime audio of the receiver which was in the USB mode and tuned to 9999.000 kHz thus producing a 1000 hz tone at the carrier frequency of WWV. The AGC on the receiver was set to “ON-medium.” <strong>PLEASE NOTE:</strong> due to operator error, the metadata in the Audacity generated .WAV files show that the AGC was “OFF”.</p> <p>See DOI 10.5281/zenodo.5775043 for data taken via the fldigi application on the same audio stream simultaneously. That dataset has .CSV files of the apparent doppler of WWV 10 MHz, and these files are named “analysis_xxxxx_K1FR-1.CSV.</p>
Festival of Frequency Measurement 1 October 2019 for WWV 5 MHz - Toby Haynes VE7CNF
<p>Festival of Frequency Measurement 1 October 2019 for WWV 5 MHz</p> <p>Toby Haynes VE7CNF<br> Location: 49.266918N 122.900887W Grid CN89ng Burnaby, BC, Canada<br> Start Time: 2019 Sept 30 at 23:58 UTC<br> End time: 2019 Oct 2 at 00:02 UTC<br> Antenna: "Inverted L" vertical with ICOM AH-4 auto tuner, 50 ft high, 70 ft horizontal top wire.<br> Receiver: ICOM IC-7410 with internal TCXO reference and internal USB sound card chip with separate clock crystal.<br> Receiver in USB mode with carrier frequency 4998.5 kHz to give a 1500 Hz audio tone for the WWV 5 MHz carrier.<br> Measurement: 1500 Hz tone frequency estimated using program FLDigi v4.1.08 in frequency analysis mode.</p> <p>There was a drop in the WWV 5 MHz signal level around 15:00 UTC, after which the reduced SNR caused more variation in the FLDigi frequency measurements.</p> <p>Frequency calibration:</p> <p>Before and after the data set, the receiver frequency error was determined by using the receiver and FLDigi to measure a reference 5 MHz sine wave from a Rigol DG1032 function generator with external 10 MHz GPS-disciplined frequency reference (Trimble).<br> The "VE7CNF raw_2019-09-30-1810 UTC.csv" file includes the reference measurements and the data set.</p> <p>The two reference signal measurements were:<br> Receiver frequency error +0.066 Hz averaged for 1 minute starting 2019 Sept 30 at 18:10:25 UTC <br> Receiver frequency error +0.028 Hz averaged for 1 minute starting 2019 Oct 2 at 00:03:10 UTC</p> <p>Receiver frequency error at each time during the data set was then estimated, assuming that the error changed linearly over time betwen the two reference measurements. The estimated receiver frequency errors were applied to correct the data set in "VE7CNF CN89ng 5 MHz_2019-09-30-2358 UTC.csv."</p> <p>The measured WWV 5 MHz frequency error vs time is graphed in "VE7CNF_WWV5MHz_2019-10-01UTC.JPG," with a moving 1-minute average applied to the frequency error. The frequency dropped around 01:30 (local sunset was 01:51 UTC) and increased around 14:00 (local sunrise was 14:13 UTC).<br> <br> </p>
WWV 5 MHz
<p>Festival of Frequency Measurement 01 October 2019<br> Event : WWV Centennial<br> UTC date : 01 October 2019<br> Beacon Frequency : 5 MHz<br> Submitter : Martin H Potter, VE3OAT<br> Data recorded at : 45.2525N 75.5910W<br> City : Greely<br> Region : Ontario, CANADA</p> <p>WARNING : Data recorded during 1330-2230 UTC considered NOT USEFUL/INVALID due<br> to weak or non-existent signal reception. <br> <br> Data file : VE3OAT 45.25 -75.59 5 MHz.csv<br> Data start time : 2019 Sep 30 23:56 UTC<br> Antenna : 80/40 m band inverted-V dipoles with common feed<br> Antenna orientation : NW-SE<br> Receiver : Yaesu FTdx1200 transceiver<br> Frequency reference : internal, undisciplined<br> Receiver mode : USB<br> IF bandwidth : 1800 Hz<br> AGC : fast<br> Digital Noise Reduction (DNR) : off<br> Frequency measurement method : Reciever in USB mode tuned to 4999.000 kHz,<br> audio output to computer sound card, frequency measured and recorded by<br> Fldigi v4.1.06 software.<br> Computer sound card : calibrated by Fldigi "WWV" function</p> <p>Observation : At 0345 UTC, rapid "flutter" fading of the signal was noted with<br> smearing of the displayed signal frequency. </p>
WWV Centennial N1IRO 5 MHz Recording
<p>Festival of Frequency Measurement 1 October 2019</p> <p>N1IRO, William McGrath</p> <p>43.935242, -72.657349</p> <p>Start time 22:15 UTC<br> End Fed 130ft Dipole pointed SE (SW max reception)</p> <p>Kenwood TS-2000 receiver</p> <p>GPSDO reference</p> <p>FLDIGI recording as instructed.</p> <p>24 hour recording of 5 MHz at station N1IRO, Randolph, VT.</p> <p> </p>
WWV Centennial Festival of Frequency Measurement 5 MHz Collected Data
<p>Manually consolidated 5MHz data from the Festival of Frequency Measurement.</p> <p>Instructions posted here: https://hamsci.org/wwv-centennial-festival-frequency-measurements</p> <p>Callsigns of participants who posted data to Zenodo: VK3ZAZ, WX4US, N7IVV, K7KMQ, AG7PQ, KM4YMI, N1IRO, AC6SL, W1KU, N1NAZ, W6OQI, VE3OAT, NA0B, VE3YX, KE0ARE, XE3I, WB4HIR, W6BM, AA6LK, W6MSU, K0ANS, W3FAY, KA6WKE, WV5L, VE7CNF, N7XZ, K2LYV, VE6IXD, K7JKM, K4BSE, N2MD, VE6GRT, WA5FRF, VA3ROM, KG4ARN, N8OBJ, NU0C, W8UM, AA8K</p> <p>Callsigns of participants whose data was not uploaded to Zenodo: AJ4YA, N9MVO, W8EDU, N7QNM, W9INE, WA7BNM</p> <p>___________________________________________________________________</p> <p><strong>Version 2: </strong></p> <p><em>Formatting changes:</em> The data has been reformatted to use callsigns, rather than Zenodo IDs, as the primary identifiers for datasets. Data is included as .csv files, an Excel workbook and a .mat file for processing in MATLAB. </p> <p><br> <em>Errata:</em> Latitude and longitude were corrected for the following stations: VA3ROM, VK3ZAZ, VE6IXD, VE3OAT, AC6SL, VE7CNF, K4BSE, VE6GRT. Added precision to some others.<br> WA7BNM used a GPSDO, which was not listed in the original dataset; this has been corrected.</p> <p>_____________________________________________________________________</p> <p><strong>Version 3:</strong> due to a formatting error, some coordinates were dropped from the MATLAB and .csv files. This has been corrected. </p>
WWV 15 MHz reception test -- 60 minutes starting at 1937 UTC, July 25, 2017.
<p>Steven Reyer, WA9VNJ. Approx.Lat/Long: 43.218, -87.951. This 60-minute 15 MHz WWV recording was started at 1937 UTC on July 25, 2017, in preparation for the Solar Eclipse experiment in late August.</p> <p>The radio is a Yaesu FT-857D locked to a Trimble Thunderbolt GPSDO using an XRef-FT oscillator interface. Antenna is an RF-PRO-1B shielded magnetic loop, aimed N-S. Calibration of the radio and sample rate correction is determined using a second Trimble Thunderbolt GPS and Rigol DG1022Z GPS-locked signal generator.</p> <p>Spectrum Lab software is used to record the WAV file and to analyze incoming audio with sample rate of 11025 Hz. FFTs are 512k-point, 75% overlapping, yielding a new measurement every 12 seconds. Radio is tuned to 14999.00 kHz USB yielding audio around 1kHz (labeled "PeakFreq" in the txt file). Thus, the measured radio frequencies are near 15000 kHz. Calibration tests show that the audio frequency measurements are approximately 0.0384 Hz high, due the approximations in both the radio's DDS and the sample rate. This 0.0384 Hz number can be subtracted from the PeakFreq values to get corrected audio frequencies, which can then be added to the 14999 kHz number.</p>
SpectrumLab display of carrier frequency of WWV-10, 21 Aug 2017
<p>NAME : Martin Potter, VE3OAT<br> GEOPOSIT : 45 15' 9.023" N 75 35' 27.60" W (Maidenhead FN25eg)<br> START TIME : 1400 UT<br> STATION CONFIG :<br> Multi-band vertical antenna with 18 radials.<br> Receiver Yaesu FTdx1200 in AM mode with audio bands limited to<br> 800-1200 Hz (18 dB/octave roll-off).<br> Trimble Thunderbolt 10 MHz output to HP 3325B sig generator set<br> to 9999 kHz and injected to station antenna.<br> Measured nominal 1 kHz beat note between WWV-10 and sig generator<br> using SpectrumLab software.<br> <br> Note : On 20 Aug, receiver AGC was ON. On 21 Aug, receiver AGC was<br> OFF and audio output level was set using RF Gain control. </p>
SpectrumLab display of carrier frequency of WWV-10, 20 Aug 2017
<p>NAME : Martin Potter, VE3OAT<br> GEOPOSIT : 45 15' 9.023" N 75 35' 27.60" W (Maidenhead FN25eg)<br> START TIME : 1400 UT<br> STATION CONFIG :<br> Multi-band vertical antenna with 18 radials.<br> Receiver Yaesu FTdx1200 in AM mode with audio bands limited to<br> 800-1200 Hz (18 dB/octave roll-off).<br> Trimble Thunderbolt 10 MHz output to HP 3325B sig generator set<br> to 9999 kHz and injected to station antenna.<br> Measured nominal 1 kHz beat note between WWV-10 and sig generator<br> using SpectrumLab software.<br> <br> Note : On 20 Aug, receiver AGC was ON. On 21 Aug, receiver AGC was<br> OFF and audio output level was set using RF Gain control. </p> <p> </p>
FFT and WAV files of 10MHz WWV Doppler shift during 8-21-2017 Solar eclipse
<p>HL Serra N6NC</p> <p>San Diego CA 32-50-36N 117-16-16W</p> <p>FFT and WAV files started 1415UT-2300UT 8-21-2017 [FFT file starts 24 hrs earlier for comparison FFTs)</p> <p>Omnidirectional 8" "active antenna"</p> <p>Rcvr Racal RA 6790 in USB mode</p> <p>Rcvr and HP-3325A GPSDO-controlled 10 MHz.</p> <p>Tuned rcvr to 9,999,000 Hz in USB mode to record in SpecLab the offset from 1000Hz beat note of 10 MHz signal.</p> <p>Very little if any Doppler shift of signal during eclipse, probably because I am located on the same side of the eclipse totality as WWV in Boulder CO. Besides rcvr, I tracked WWV frequency with GPSDO-controlled HP-3325 and scope comparing the tuned HP frequency with the rcvr's 455kHz IF to find recorded FFT offset. HP stable for two days showing WWV freq as 10,000,000.013 Hz by watching unmoving Lissajous figure on scope, so no visually perceptible Doppler excursions in frequency detected, but the FFT data will show whatever frequency movement there might have been.</p> <p> </p> <p>73, Larry N6NC</p>
SpectrumLab calculated data for WWV-10 on 20 Aug 2017
<p>NAME : Martin Potter, VE3OAT<br> GEOPOSIT : 45 15' 9.023" N 75 35' 27.60" W (Maidenhead FN25eg)<br> START TIME : 1400 UT<br> STATION CONFIG :<br> Multi-band vertical antenna with 18 radials.<br> Receiver Yaesu FTdx1200 in AM mode with audio bands limited to<br> 800-1200 Hz (18 dB/octave roll-off).<br> Trimble Thunderbolt 10 MHz output to HP 3325B sig generator set<br> to 9999 kHz and injected to station antenna.<br> Measured nominal 1 kHz beat note between WWV-10 and sig generator<br> using SpectrumLab software.<br> <br> Note : On 20 Aug, receiver AGC was ON. On 21 Aug, receiver AGC was<br> OFF and audio output level was set using RF Gain control. </p> <p> </p>
Two graphical displays from SpectrumLab of WWV-10 carrier frequency on 18 Aug 2017
<p>NAME : Martin Potter, VE3OAT<br> GEOPOSIT : 45 15' 9.023" N 75 35' 27.60" W (Maidenhead FN25eg)<br> START TIME : 1400 UT<br> STATION CONFIG :<br> Multi-band vertical antenna with 18 radials.<br> Receiver Yaesu FTdx1200 in AM mode with audio bands limited to<br> 800-1200 Hz (18 dB/octave roll-off).<br> Trimble Thunderbolt 10 MHz output to HP 3325B sig generator set<br> to 9999 kHz and injected to station antenna.<br> Measured nominal 1 kHz beat note between WWV-10 and sig generator<br> using SpectrumLab software.<br> <br> Note : On 20 Aug, receiver AGC was ON. On 21 Aug, receiver AGC was<br> OFF and audio output level was set using RF Gain control. </p> <p> </p>
Calculated frequency data from SpectrumLab, for WWV-10, 21 Aug 2017
<p>NAME : Martin Potter, VE3OAT<br> GEOPOSIT : 45 15' 9.023" N 75 35' 27.60" W (Maidenhead FN25eg)<br> START TIME : 1400 UT<br> STATION CONFIG :<br> Multi-band vertical antenna with 18 radials.<br> Receiver Yaesu FTdx1200 in AM mode with audio bands limited to<br> 800-1200 Hz (18 dB/octave roll-off).<br> Trimble Thunderbolt 10 MHz output to HP 3325B sig generator set<br> to 9999 kHz and injected to station antenna.<br> Measured nominal 1 kHz beat note between WWV-10 and sig generator<br> using SpectrumLab software.<br> <br> Note : On 20 Aug, receiver AGC was ON. On 21 Aug, receiver AGC was<br> OFF and audio output level was set using RF Gain control. </p>
Audio files of beat note between WWV-10 carrier wave and GPS reference signal
<p>NAME : Martin Potter, VE3OAT<br> GEOPOSIT : 45 15' 9.023" N 75 35' 27.60" W (Maidenhead FN25eg)<br> START TIME : 1400 UT<br> STATION CONFIG :<br> Multi-band vertical antenna with 18 radials.<br> Receiver Yaesu FTdx1200 in AM mode with audio bandwidth limited to<br> 800-1200 Hz (18 dB/octave roll-off).<br> Trimble Thunderbolt 10 MHz output to HP 3325B sig generator set<br> to 9999 kHz and injected to station antenna.<br> Measured nominal 1 kHz beat note between WWV-10 and sig generator<br> using SpectrumLab software. Audio WAV file recorded by SpectrumLab. <br> <br> Note : On 20 Aug, receiver AGC was ON. On 21 Aug, receiver AGC was<br> OFF and audio output level was set using RF Gain control. </p> <p> </p>
December 2021 eclipse monitoring of WWV at 10 MHz using Grape 1
<p>Ten days of fldigi recordings in HamSci Grape 1 format of WWV at 10 MHz around the December 2021 eclipse</p>
WWV USB Recording by KD2LOF, 5 MHz, no GPSDO
<p><strong>Callsign:</strong> KD2LOF-1</p> <p><strong>Radio:</strong> Icom 7300</p> <p><strong>GPSDO:</strong> No</p> <p><strong>Antenna: </strong>G5RV Junior</p> <p><strong>Coordinates:</strong> (40.72412 -73.98919)</p> <p><strong>Elevation:</strong> 16.5 meters</p> <p>KD2LOF_R_4999kHz__2021-12-03_23-28-47</p> <p>KD2LOF_R_4999kHz__2021-12-04_20-28-35</p> <p><strong>Callsign:</strong> KD2LOF-2</p> <p><strong>Radio:</strong> AIRSPY HF+ Discovery</p> <p><strong>GPSDO:</strong> No</p> <p><strong>Antenna: </strong>MLA30+ Magloop</p> <p><strong>Coordinates:</strong> (40.72412 -73.98919)</p> <p><strong>Elevation:</strong> 16.5 meters</p> <p>SNASH_2021-12-06_23-04-52/KD2LOF-2_23-04-52_ET_4999 kHz_No GPSDO_0</p> <p>SNASH_2021-12-08_23-27-25/KD2LOF-2_23-27-25_ET_4999 kHz_No GPSDO_0</p>
WWV Centennial Trial Run Recording of WWV 10 MHz from Eastern PA, U.S.A.
<p>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.</p> <p> </p> <p>Event: coordinated first attempt</p> <p>UTC Date: 20190801</p> <p>Beacon frequency: 10.000 000</p> <p>Station Name: KA2VLP/KB3UMD</p> <p>Latitude: 40.1875 N</p> <p>Long: 75.4581 W</p> <p>Grid: FN20ge</p> <p>City: Collegeville, PA</p> <p>SF=67, A=8, K=1 at start of measurement</p> <p><br> Difficulties had: Needed to calibrate sound card using fldigi RX ppm. Settled on a value of -20 ppm for minimum drift in Scope display</p> <p><br> Equipment: Kenwood TS-590SG; with SO-3 TXCO installed; 4 hours warm up</p> <p><br> SW: fldigi ver 3.23.21</p> <p><br> In fldigi Freq Analysis mode, cursor was centered around 1004 on the waterfall. Therefore, Freq Error column in data file is relative to 10.000 004 MHz.</p> <p><br> Soapbox: Great time here participating in the experiment and discovering new things together! It was interesting to watch the signal change over the course of the day each time we went downstairs to check on it.</p> <p><br> Released publicly under Creative Commons: yes</p>
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