Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
On 8 December 2014 at 07:24, Chris Wilson ch...@chriswilson.tv wrote: This is audible here in the UK and elicited many comments on 160 meters last night. Seen as oblique striations on SDR receiver displays and audible as a clicking sound. What the devil is it? Best Regards, Chris Wilson. A mutation of the woodpecker. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Is the signal still there? I looked here on the West Coast - don't really see anything. Thanks, John AJ6BC On Mon, Dec 8, 2014 at 12:42 AM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: On 8 December 2014 at 07:24, Chris Wilson ch...@chriswilson.tv wrote: This is audible here in the UK and elicited many comments on 160 meters last night. Seen as oblique striations on SDR receiver displays and audible as a clicking sound. What the devil is it? Best Regards, Chris Wilson. A mutation of the woodpecker. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Wouldn't you know it - about the time I sent that last e-mail - I am getting something in the 1.915 MHz range right now - and you could say this is around 4 Hz or so - I am trying to see if I can get a match on any modulation type - but nothing so far. Definitely wider though. Regards, John AJ6BC On Mon, Dec 8, 2014 at 2:05 AM, John C. Westmoreland, P.E. j...@westmorelandengineering.com wrote: Is the signal still there? I looked here on the West Coast - don't really see anything. Thanks, John AJ6BC On Mon, Dec 8, 2014 at 12:42 AM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: On 8 December 2014 at 07:24, Chris Wilson ch...@chriswilson.tv wrote: This is audible here in the UK and elicited many comments on 160 meters last night. Seen as oblique striations on SDR receiver displays and audible as a clicking sound. What the devil is it? Best Regards, Chris Wilson. A mutation of the woodpecker. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
this signal is being heard all across the eastern part of North America and there are reports from at least as far west as Montana. I can hear it during the day but at a very low level. Night time levels are much stronger. cheers, Graham ve3gtc FN25ig near Ottawa Canada On 2014-12-07 19:09, Bob Camp wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise ….. Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Radiolocation may be a bit misleading. Some first thought that this was CODAR but it is not, at least not what I am familiar with but it may be another variation of an ocean surface wave RADAR type of system but it is certainly not like one I have heard before. cheers, Graham ve3gtc On 2014-12-07 20:03, paul swed wrote: Not aware of any testing plus it makes no sense these days. LORAN long ago abandoned and was in that range and Loran C in the US dead. UrsaNav has been quite for quite a while. Regards Paul WB8TSL On Sun, Dec 7, 2014 at 7:09 PM, Bob Camp kb...@n1k.org wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise ….. Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Hello, Can someone please post a *.wav file of what it sounds like provided you have an SDR set-up? If you need someplace to post - please send the file to me offlist and I'll put it on either an ftp site or http. I am not so convinced what I saw wasn't noise or some stations from China transmitting - which I have seen in the 160m band lately. I got an AM band tonight also that was stomping all over ~ 3.87 MHz. Thanks! John AJ6BC On Mon, Dec 8, 2014 at 2:30 AM, Graham planoph...@aei.ca wrote: Radiolocation may be a bit misleading. Some first thought that this was CODAR but it is not, at least not what I am familiar with but it may be another variation of an ocean surface wave RADAR type of system but it is certainly not like one I have heard before. cheers, Graham ve3gtc On 2014-12-07 20:03, paul swed wrote: Not aware of any testing plus it makes no sense these days. LORAN long ago abandoned and was in that range and Loran C in the US dead. UrsaNav has been quite for quite a while. Regards Paul WB8TSL On Sun, Dec 7, 2014 at 7:09 PM, Bob Camp kb...@n1k.org wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise ….. Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/ 1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
On 2014-12-07 16:28, Tim Shoppa wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Could it be an artifact of interference with NAA 1-1.8MW@24kHz which also uses ~3MW@60Hz for deicing on the inactive array, as it is now below freezing and fairly humid in coastal Maine http://en.wikipedia.org/wiki/VLF_Transmitter_Cutler -- Take care. Thanks, Brian Inglis ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
On 2014-12-07 16:28, Tim Shoppa wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/__1910-intruder.wav http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/__1910-intruder-1.png http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/__1910-intruder-2.png http://www.trailing-edge.com/1910-intruder-2.png On Mon, Dec 8, 2014 at 9:15 AM, Brian Inglis brian.ing...@systematicsw.ab.ca mailto:brian.ing...@systematicsw.ab.ca wrote: Could it be an artifact of interference with NAA 1-1.8MW@24kHz which also uses ~3MW@60Hz for deicing on the inactive array, as it is now below freezing and fairly humid in coastal Maine http://en.wikipedia.org/wiki/__VLF_Transmitter_Cutler http://en.wikipedia.org/wiki/VLF_Transmitter_Cutler On 2014-12-08 07:30, Tim Shoppa wrote: 80*24 = 1920. 80th harmonic seems quite a stretch unless there is some malfunction (as you point out maybe an interaction with 60Hz heating... hmm... maybe they thought they could use PWM on the heating circuit.). For sure they have enough power and enough wire in the air to do the damage being observed. Do you know what the normal 24kHz waveform looks like? (FSK, MSK?) Some of the locals think it is iceland and that is pretty much the same beam heading as Cutler Maine. OK beam is a little optimistic,but we do have directional antennas for 160M and we do know which way is NE :-) Articles about NAA VLF say MSK@24kHz, that the deicing power available is quadruple the 3MW@60Hz to meet time goals, and it is operated remotely from somewhere around DC! -- Take care. Thanks, Brian Inglis ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
80*24 = 1920. 80th harmonic seems quite a stretch unless there is some malfunction (as you point out maybe an interaction with 60Hz heating... hmm... maybe they thought they could use PWM on the heating circuit.). For sure they have enough power and enough wire in the air to do the damage being observed. Do you know what the normal 24kHz waveform looks like? (FSK, MSK?) Some of the locals think it is iceland and that is pretty much the same beam heading as Cutler Maine. OK beam is a little optimistic,but we do have directional antennas for 160M and we do know which way is NE :-) Tim N3QE On Mon, Dec 8, 2014 at 9:15 AM, Brian Inglis brian.ing...@systematicsw.ab.ca wrote: On 2014-12-07 16:28, Tim Shoppa wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Could it be an artifact of interference with NAA 1-1.8MW@24kHz which also uses ~3MW@60Hz for deicing on the inactive array, as it is now below freezing and fairly humid in coastal Maine http://en.wikipedia.org/wiki/VLF_Transmitter_Cutler -- Take care. Thanks, Brian Inglis ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Also hearing in central NH sounds like a new 'Woodpecker' Joy... Content by Scott Typos by Siri On Dec 8, 2014, at 2:24 AM, Chris Wilson ch...@chriswilson.tv wrote: Hello, on 08/12/2014 07:21 you wrote: I'm hearing the same signal in northern New Hampshire. Very strong 73, Frits W1FVB This is audible here in the UK and elicited many comments on 160 meters last night. Seen as oblique striations on SDR receiver displays and audible as a clicking sound. What the devil is it? -- Best Regards, Chris Wilson. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
On 12/8/14, 6:15 AM, Brian Inglis wrote: On 2014-12-07 16:28, Tim Shoppa wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Could it be an artifact of interference with NAA 1-1.8MW@24kHz which also uses ~3MW@60Hz for deicing on the inactive array, as it is now below freezing and fairly humid in coastal Maine http://en.wikipedia.org/wiki/VLF_Transmitter_Cutler A ham friend of mine noticed that a local grow house radiated a lot of power around 7.1 MHz with a very strong line structure at 183 kHz and harmonics. (Or thereabouts, he was telling me last week, I can't remember the exact). The 180 kHz is presumably from the DC/DC converters driving the lights. The spectrum bump around 7.1 MHz is speculated to be something from the physical configuration e.g. the length of the wires to the lights. Of course, these folks aren't particularly concerned about EMI/EMC issues (they rent a house in a residential neighborhood and do some redecoration). (they're not concerned, yet, until they realize that the RFI is like a big flashing light saying illegal grow operation here) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Recorded last night. Audio bandwidth is a few kHz, but as mentioned before the signal is about 20 kHz wide. https://www.dropbox.com/s/bnp8zcpgw86l6ww/1910.wav?dl=0 This morning (14:21 UTC) nothing is heard Frits W1FVB Whitefield, NH On 12/8/14, John C. Westmoreland, P.E. j...@westmorelandengineering.com wrote: Hello, Can someone please post a *.wav file of what it sounds like provided you have an SDR set-up? If you need someplace to post - please send the file to me offlist and I'll put it on either an ftp site or http. I am not so convinced what I saw wasn't noise or some stations from China transmitting - which I have seen in the 160m band lately. I got an AM band tonight also that was stomping all over ~ 3.87 MHz. Thanks! John AJ6BC On Mon, Dec 8, 2014 at 2:30 AM, Graham planoph...@aei.ca wrote: Radiolocation may be a bit misleading. Some first thought that this was CODAR but it is not, at least not what I am familiar with but it may be another variation of an ocean surface wave RADAR type of system but it is certainly not like one I have heard before. cheers, Graham ve3gtc On 2014-12-07 20:03, paul swed wrote: Not aware of any testing plus it makes no sense these days. LORAN long ago abandoned and was in that range and Loran C in the US dead. UrsaNav has been quite for quite a while. Regards Paul WB8TSL On Sun, Dec 7, 2014 at 7:09 PM, Bob Camp kb...@n1k.org wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise . Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/ 1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- vbradio.wordpress.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Hello Frits, Interesting. A little different than what I heard - but of course depends on the bandwidth somewhat. How many dB was this up from the noise floor? Or - what is the signal level of the received signal? What modulation did you try to decode or did you just set it wide-AM? I saw something like I mentioned around 1.915 MHz. It then dropped down to around 1.913 MHz - and then it went away. I did make a recording - but I didn't get the best part due to the signal moving down a bit - from 1.915 to 1.913 MHz. Thanks, John AJ6BC On Mon, Dec 8, 2014 at 6:22 AM, Frister fris...@gmx.net wrote: Recorded last night. Audio bandwidth is a few kHz, but as mentioned before the signal is about 20 kHz wide. https://www.dropbox.com/s/bnp8zcpgw86l6ww/1910.wav?dl=0 This morning (14:21 UTC) nothing is heard Frits W1FVB Whitefield, NH On 12/8/14, John C. Westmoreland, P.E. j...@westmorelandengineering.com wrote: Hello, Can someone please post a *.wav file of what it sounds like provided you have an SDR set-up? If you need someplace to post - please send the file to me offlist and I'll put it on either an ftp site or http. I am not so convinced what I saw wasn't noise or some stations from China transmitting - which I have seen in the 160m band lately. I got an AM band tonight also that was stomping all over ~ 3.87 MHz. Thanks! John AJ6BC On Mon, Dec 8, 2014 at 2:30 AM, Graham planoph...@aei.ca wrote: Radiolocation may be a bit misleading. Some first thought that this was CODAR but it is not, at least not what I am familiar with but it may be another variation of an ocean surface wave RADAR type of system but it is certainly not like one I have heard before. cheers, Graham ve3gtc On 2014-12-07 20:03, paul swed wrote: Not aware of any testing plus it makes no sense these days. LORAN long ago abandoned and was in that range and Loran C in the US dead. UrsaNav has been quite for quite a while. Regards Paul WB8TSL On Sun, Dec 7, 2014 at 7:09 PM, Bob Camp kb...@n1k.org wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise . Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/ 1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- vbradio.wordpress.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
John, On 12/8/14, John C. Westmoreland, P.E. j...@westmorelandengineering.com wrote: Hello Frits, Interesting. A little different than what I heard - but of course depends on the bandwidth somewhat. I think my bandwidth was set at about 8 Khz How many dB was this up from the noise floor? Or - what is the signal level of the received signal? What modulation did you try to decode or did you just set it wide-AM? I've build a down converter in my old IC-735 and have about 22 Khz of spectrum to look at at once. Using Xlinrad as the SDR. Had the audio passband in Double Side Band mode.. 4 kHz below and 4 kHz above the center frequency. Signal strength in Linrad wasn't calibrated , but on the icom analog meter S9+30 dB I saw something like I mentioned around 1.915 MHz. It then dropped down to around 1.913 MHz - and then it went away. I did make a recording - but I didn't get the best part due to the signal moving down a bit - from 1.915 to 1.913 MHz. Thanks, John AJ6BC 73 Frits W1FVB -- vbradio.wordpress.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise ….. Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Not aware of any testing plus it makes no sense these days. LORAN long ago abandoned and was in that range and Loran C in the US dead. UrsaNav has been quite for quite a while. Regards Paul WB8TSL On Sun, Dec 7, 2014 at 7:09 PM, Bob Camp kb...@n1k.org wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise ….. Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Hi Tim, Look for a switching power supply that is fairly new, and is of the sort that doesn't need to be messed with to cover the full 120V to 240V range. That sort of switcher is also known as a power factor correcting switcher. It has a PWM switched pre-regulator that takes the unfiltered ripple straight from a full wave bridge rectifier, and PWM's it so that it can charge the filter capacitor, without the power line seeing anything but a resistive load. It also controls the inrush current. PWM pre filters, because they quickly shift the pwm signal at a 120Hz rate, are capable of producing lots of broadband 120Hz modulated garbage if their shields, or filters are compromised. -Chuck Harris Tim Shoppa wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
They may also be modulating it to spread out the peak energy to meet EMI requirements. Tom - Original Message - From: Chuck Harris cfhar...@erols.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, December 07, 2014 8:41 PM Subject: Re: [time-nuts] 1900kHz radiolcation testing on east coast US? Hi Tim, Look for a switching power supply that is fairly new, and is of the sort that doesn't need to be messed with to cover the full 120V to 240V range. That sort of switcher is also known as a power factor correcting switcher. It has a PWM switched pre-regulator that takes the unfiltered ripple straight from a full wave bridge rectifier, and PWM's it so that it can charge the filter capacitor, without the power line seeing anything but a resistive load. It also controls the inrush current. PWM pre filters, because they quickly shift the pwm signal at a 120Hz rate, are capable of producing lots of broadband 120Hz modulated garbage if their shields, or filters are compromised. -Chuck Harris Tim Shoppa wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Taking in account that is is heard quite strong in most US and even in Toronto and that it sweeps in a fairly controlled way it is an intentional radiator. It could be an ionospheric sounder or a sea waves measuring device of a new kind. I think that an interference so powerful must be discarded. I don't receive it in Spain but I'm very close to several powerful MW broadcast transmitters and they can mask the signal due to saturation. Ignacio EB4APL On 08/12/2014 a las 2:41, Chuck Harris wrote: Hi Tim, Look for a switching power supply that is fairly new, and is of the sort that doesn't need to be messed with to cover the full 120V to 240V range. That sort of switcher is also known as a power factor correcting switcher. It has a PWM switched pre-regulator that takes the unfiltered ripple straight from a full wave bridge rectifier, and PWM's it so that it can charge the filter capacitor, without the power line seeing anything but a resistive load. It also controls the inrush current. PWM pre filters, because they quickly shift the pwm signal at a 120Hz rate, are capable of producing lots of broadband 120Hz modulated garbage if their shields, or filters are compromised. -Chuck Harris Tim Shoppa wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
I'm hearing the same signal in northern New Hampshire. Very strong 73, Frits W1FVB On 12/8/14, Bob Camp kb...@n1k.org wrote: Hi 120 Hz sub structure suggests a (much lower power) switching power supply run amok. I certainly would not design a system that would have virtually no immunity to power line noise . Bob On Dec 7, 2014, at 6:28 PM, Tim Shoppa tsho...@gmail.com wrote: Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- vbradio.wordpress.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Hello, on 08/12/2014 07:21 you wrote: I'm hearing the same signal in northern New Hampshire. Very strong 73, Frits W1FVB This is audible here in the UK and elicited many comments on 160 meters last night. Seen as oblique striations on SDR receiver displays and audible as a clicking sound. What the devil is it? -- Best Regards, Chris Wilson. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
