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Dennis H.
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Post subject: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 2:15 am |
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Joined: Aug Mon 17, 2009 3:11 pm Posts: 4208
Location: Fort Worth, Texas USA
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I see this quite often. Does anyone recognize it's portrait?
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Image1.jpg [ 475.6 KiB | Viewed 1212 times ]
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_________________ The lucky ones realize the "Good Ole Days" while they are still in them! AA5LP
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scott.hettel
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 2:33 am |
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Joined: Dec Sun 06, 2020 9:33 pm Posts: 339
Location: Waterbury, CT. 06704
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Possibly a Cuban "tapper" station. They have been actively jamming the 40 meter band. They may have expanded.
_________________ To keep a true perspective of one's importance, everyone should have a cat that will ignore them.​
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davep
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 12:15 pm |
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Joined: Jan Thu 01, 1970 12:00 am Posts: 2807
Location: Virginia Beach, VA
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The 10140 might be a harmonic of WTWW 5070 . I don’t see any time indications. Was this at night?
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Peter Bertini
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 12:20 pm |
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Joined: Jan Thu 01, 1970 12:00 am Posts: 22974
Location: Somers CT
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10.130 MHz is the FT8 mode operating frequency.
_________________ Just because it can be done doesn't mean it should be done.
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davep
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 12:27 pm |
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Joined: Jan Thu 01, 1970 12:00 am Posts: 2807
Location: Virginia Beach, VA
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Peter Bertini
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 1:56 pm |
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Joined: Jan Thu 01, 1970 12:00 am Posts: 22974
Location: Somers CT
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davep wrote: The 10140 might be a harmonic of WTWW 5070 . I don’t see any time indications. Was this at night? Might Be FT-4 digital signals. 10140 kHz is the FT-4 default. BTW, FT-8 uses 30_secobd timed intervals, have you listed to the frequency in USB mode? FT-4 uses 30 second intervals. and they are synced to within a 10th of a second or so.
_________________ Just because it can be done doesn't mean it should be done.
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davep
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 2:08 pm |
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Joined: Jan Thu 01, 1970 12:00 am Posts: 2807
Location: Virginia Beach, VA
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That would be the gaps in the waterfall plot. Thanks Peter Dennis, you might have decoding software in your extension dropdown
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Peter Bertini
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 2:49 pm |
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Joined: Jan Thu 01, 1970 12:00 am Posts: 22974
Location: Somers CT
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ft4 is 15 seconds, correction. you see similar at 14074 kc?
_________________ Just because it can be done doesn't mean it should be done.
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Rich, W3HWJ
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 3:59 pm |
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Joined: May Tue 30, 2006 3:46 pm Posts: 12053
Location: Santa Rosa, CA
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I think FT4 is 5 seconds and FT8 is 15 seconds?
Rich
PS: WSJTx software is easy to install. You need to have a computer-to-radio USB cable, however.
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davep
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 4:17 pm |
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Joined: Jan Thu 01, 1970 12:00 am Posts: 2807
Location: Virginia Beach, VA
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Dennis H.
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Mon 08, 2022 6:26 pm |
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Joined: Aug Mon 17, 2009 3:11 pm Posts: 4208
Location: Fort Worth, Texas USA
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Thanks guys. This was taken later on Sunday evening. I don't see it Monday. I think I'll load some software and see if I can decode it.
_________________ The lucky ones realize the "Good Ole Days" while they are still in them! AA5LP
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KenwoodHam
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Tue 09, 2022 10:35 am |
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Joined: Sep Thu 30, 2021 6:57 pm Posts: 252
Location: Keene, NH USA
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It could be a USA amateur radio (digital mode) operator, but I doubt it. It doesn't look like a digital signal and 30m Voice is not allowed in the USA.
As far as amateur radio goes in the USA, we are secondary on 30 meters. "Fixed Services" are primary. It's hard to find much about those type of transmissions, because they are used by private, government, military entities and mostly outside the USA, for example NATO and some foreign embassies. Most Fixed Services are point-to-point.
I would think anything using 30m for that purpose is antiquated. Higher frequencies with digital encryption would be better suited these days.
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Peter Bertini
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Post subject: Re: What mode is this signal on 30 meters. Posted: Aug Tue 09, 2022 8:45 pm |
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Joined: Jan Thu 01, 1970 12:00 am Posts: 22974
Location: Somers CT
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FT8.
_________________ Just because it can be done doesn't mean it should be done.
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