Writing : August 22, 2008
Here are specimen sound files and spectrograms of some interesting radio meteor receptions that have occurred recently during my full time observations.
It appears that occasionally a meteor will create a sort of modulation effect of the 83.250 MHz ( US tv channel 6 ) video carrier wave transmission.
Perhaps some of you may have heard something like this in your own radio observations?
Any comments or explanations of this modulation are welcome. Thanks for your time.
I am posting the sound files as full .wav files without any further compressions.
Thomas Ashcraft
New Mexico 35.50 North Lat 105.89 West Long Near Eldorado, New Mexico
Radios are two separate ICOM PCR1000 models. Antenna for 61.250 MHz is a half wave dipole. Antenna for 83.250 MHz is a yagi.
Radio spectrogram: 61.250 MHz CW ( tv channel 3 video carrier ) reception above white line, 83.250 MHz CW ( tv channel 6 video carrier ) below white line.
Specimen occurs during 1912-1914 UT minutes August 13, 2008 ( 13:12 - 13:14 MDT )
Sound file of onset of reception MysteryAug202008_HE1912ut_Ashcraft.wav 30 seconds 5.6 MB .wav file
Radio spectrogram: 61.250 MHz CW ( tv channel 3 video carrier ) reception above white line, 83.250 MHz CW ( tv channel 6 video carrier ) below white line.
Specimen occurs at 0007 August 13, 2008 ( 18:08 MDT)
Sound file of onset of reception mystery0007utAug132008.wav 3.8 MB stereo
Specimen occurs at 0225 UT August 13, 2008. ( 20:25 MDT )
Sound file of onset of reception mystery0225utAug132008Ashcraft.wav 6.2 MB
Here are some smaller anomalous receptions with sound files.
Radio spectrogram: 61.250 MHz CW ( tv channel 3 video carrier ) reception above white line, 83.250 MHz CW ( tv channel 6 video carrier ) below white line.
Specimen occurs during 2233 UT minute August 18, 2008 ( 18:08 MDT) on the 83.250 MHz channel.
MysteryAug182008_2333ut_Ashcraft.wav 15 seconds 2.9 MB .wav file
Radio spectrogram: 61.250 MHz CW ( tv channel 3 video carrier ) reception above white line, 83.250 MHz CW ( tv channel 6 video carrier ) below white line.
Specimen occurs during 2217 UT minute August 18, 2008 ( 16:17 MDT) on the 83.250 MHz channel.
MysteryAug182008_2217ut_Ashcraft.wav 7 seconds 1.4 MB .wav file
Radio spectrogram: 61.250 MHz CW ( tv channel 3 video carrier ) reception above white line, 83.250 MHz CW ( tv channel 6 video carrier ) below white line.
Specimen occurs during 0107 UT minute August 18, 2008 ( 1907 MDT ) on the 83.250 MHz channel.
This is a full movie specimen. Interestingly, at 10 seconds into movie there is a streak of lightning to my southerly direction.
The vertical lines in the spectrogram above are lightning.
mysteryAug182008_0107ut_Ashcraft.mp4 36 seconds 7.5 MB .mp4 Movie file
Radio spectrogram: 61.250 MHz CW ( tv channel 3 video carrier ) reception above white line, 83.250 MHz CW ( tv channel 6 video carrier ) below white line.
Onset only of this reception: MysteryAug132008_0148ut_Ashcraft.wav 22 seconds 4.1 MB .wav file
Link to my Radio Meteor Pages
Thomas Ashcraft
New Mexico 35.50 North Lat 105.89 West Long Near Eldorado, New Mexico