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#1
March 22nd 08, 09:55 PM
posted to rec.radio.shortwave
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2750KHz odd sound
http://www.lazygranch.com/sound/shortwave/2750khz.ogg
SF Bay area approx 9GMT 3/22/2008 2750Khz AM 9.5kHz filter |
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#2
March 22nd 08, 10:10 PM
posted to rec.radio.shortwave
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2750KHz odd sound
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#3
March 22nd 08, 10:18 PM
posted to rec.radio.shortwave
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2750KHz odd sound
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? -- Telamon Ventura, California Ogg. It plays in winamp, irfanview, videolan. |
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#5
March 23rd 08, 12:46 AM
posted to rec.radio.shortwave
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2750KHz odd sound
On Mar 22, 6:08 pm, msg wrote:
wrote: http://www.lazygranch.com/sound/shortwave/2750khz.ogg SF Bay area approx 9GMT 3/22/2008 2750Khz AM 9.5kHz filter Hmm, your original post never arrived at Supernews. Interesting; sounds like some sort of channel calibration/equalization/training. What were your receiver settings (mode, filter widths, processing)? When I first began listening, my impression was of out-of-band interference from a paging transmitter or trunking public service repeater slowed _way_ down. Michael I already stated the receiver was in AM mode using the 9.5Khz bandwidth. No processing. |
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#6
March 23rd 08, 01:54 AM
posted to rec.radio.shortwave
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2750KHz odd sound
wrote:
On Mar 22, 6:08 pm, msg wrote: wrote: http://www.lazygranch.com/sound/shortwave/2750khz.ogg SF Bay area approx 9GMT 3/22/2008 2750Khz AM 9.5kHz filter Hmm, your original post never arrived at Supernews. Interesting; sounds like some sort of channel calibration/equalization/training. What were your receiver settings (mode, filter widths, processing)? When I first began listening, my impression was of out-of-band interference from a paging transmitter or trunking public service repeater slowed _way_ down. Michael I already stated the receiver was in AM mode using the 9.5Khz bandwidth. No processing. Yes, but I don't have your original post  Michael |
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#7
March 23rd 08, 01:56 AM
posted to rec.radio.shortwave
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2750KHz odd sound
wrote:
On Mar 22, 6:08 pm, msg wrote: wrote: http://www.lazygranch.com/sound/shortwave/2750khz.ogg SF Bay area approx 9GMT 3/22/2008 2750Khz AM 9.5kHz filter Hmm, your original post never arrived at Supernews. Interesting; sounds like some sort of channel calibration/equalization/training. What were your receiver settings (mode, filter widths, processing)? When I first began listening, my impression was of out-of-band interference from a paging transmitter or trunking public service repeater slowed _way_ down. Michael I already stated the receiver was in AM mode using the 9.5Khz bandwidth. No processing. Sorry, in the clutter of quoted material and since I was distracted by the lack of the original post, I simply missed that. Michael |
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#8
March 23rd 08, 12:45 AM
posted to rec.radio.shortwave
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2750KHz odd sound
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 |
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#9
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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#10
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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