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#2
March 23rd 08, 02:03 AM
posted to rec.radio.shortwave
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2750KHz odd sound
On Mar 22, 5:45 pm, Telamon
wrote: In article , wrote: On Mar 22, 3:10 pm, Telamon wrote: In article , wrote: http://www.lazygranch.com/sound/shortwave/2750khz.ogg SF Bay area approx 9GMT 3/22/2008 2750Khz AM 9.5kHz filter What is the file format? Ogg. It plays in winamp, irfanview, videolan. I down loaded the free videolan player. Nice app. I think someone is testing a transmitter. It just sounds to me to be a series of tones low to high and at one point a tone ramp. If I'm awake at 2 AM I'll give it a listen. -- Telamon Ventura, California That is my guess too. The signal itself doesn't sound "informative", i.e. no modulation. The allocation for that frequency isn't all that strict(fixed, mobile, some aero), but given the power and consistency, it is fixed. |
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#3
March 23rd 08, 02:12 AM
posted to rec.radio.shortwave
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2750KHz odd sound
In article
, wrote: On Mar 22, 5:45 pm, Telamon wrote: In article , wrote: On Mar 22, 3:10 pm, Telamon wrote: In article , wrote: http://www.lazygranch.com/sound/shortwave/2750khz.ogg SF Bay area approx 9GMT 3/22/2008 2750Khz AM 9.5kHz filter What is the file format? Ogg. It plays in winamp, irfanview, videolan. I down loaded the free videolan player. Nice app. I think someone is testing a transmitter. It just sounds to me to be a series of tones low to high and at one point a tone ramp. If I'm awake at 2 AM I'll give it a listen. That is my guess too. The signal itself doesn't sound "informative", i.e. no modulation. The allocation for that frequency isn't all that strict(fixed, mobile, some aero), but given the power and consistency, it is fixed. The series of tones and tone ramp could be a test of the transmitter modulation capabilities. -- Telamon Ventura, California |
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#4
March 23rd 08, 03:59 PM
posted to rec.radio.shortwave
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2750KHz odd sound
In message
, Telamon writes In article , wrote: On Mar 22, 5:45 pm, Telamon wrote: In article , wrote: On Mar 22, 3:10 pm, Telamon wrote: In article , wrote: http://www.lazygranch.com/sound/shortwave/2750khz.ogg SF Bay area approx 9GMT 3/22/2008 2750Khz AM 9.5kHz filter What is the file format? Ogg. It plays in winamp, irfanview, videolan. I down loaded the free videolan player. Nice app. I think someone is testing a transmitter. It just sounds to me to be a series of tones low to high and at one point a tone ramp. If I'm awake at 2 AM I'll give it a listen. That is my guess too. The signal itself doesn't sound "informative", i.e. no modulation. The allocation for that frequency isn't all that strict(fixed, mobile, some aero), but given the power and consistency, it is fixed. The series of tones and tone ramp could be a test of the transmitter modulation capabilities. Second harmonic of MW transmitter (either transmitted, or generated in your receiver)? -- Ian |
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