kidphc Posted November 20 Report Posted November 20 Buddy ran into something on his waterfall. We both have been scratching our heads. The ham group on Facebook says it's radar, it could be hence the shifting width of the signal. It's just nothing like any Eldar signals I have seen. Although, we can't rule it out. He is close enough to 3 international and 1 community airports. Originally, I thought it was a spread spectrum signal because of the stepping. Hoping someone else has seen something similar. Link to the Facebook post, for those that don't want to download the videos. https://www.facebook.com/share/v/1AfUqPiQaZ/https://cloud.tapatalk.com/s/673e2262d4234/VID_20241120_124934%20%281%29.mp4https://cloud.tapatalk.com/s/673e226aa6fa6/VID_20241120_124934.mp4 Sent from my SM-S901U using Tapatalk Quote
dosw Posted November 20 Report Posted November 20 6 minutes ago, kidphc said: Buddy ran into something on his waterfall. We both have been scratching our heads. The ham group on Facebook says it's radar, it could be hence the shifting width of the signal. It's just nothing like any Eldar signals I have seen. Although, we can't rule it out. He is close enough to 3 international and 1 community airports. Originally, I thought it was a spread spectrum signal because of the stepping. Hoping someone else has seen something similar. Link to the Facebook post, for those that don't want to download the videos. https://www.facebook.com/share/v/1AfUqPiQaZ/https://cloud.tapatalk.com/s/673e2262d4234/VID_20241120_124934%20%281%29.mp4https://cloud.tapatalk.com/s/673e226aa6fa6/VID_20241120_124934.mp4 Sent from my SM-S901U using Tapatalk I'd prefer an alternative that doesn't require I log into facebook for the first time in a few years. Even a screenshot of the waterfall ought to help. Quote
kidphc Posted November 20 Author Report Posted November 20 I'd prefer an alternative that doesn't require I log into facebook for the first time in a few years. Even a screenshot of the waterfall ought to help.Attached a screen shot, tried to reattach the video filed.https://cloud.tapatalk.com/s/673e24f4dcc13/VID_20241120_124934%20%281%29.mp4https://cloud.tapatalk.com/s/673e24fb69dfc/VID_20241120_124934.mp4Sent from my SM-S901U using Tapatalk Quote
dosw Posted November 20 Report Posted November 20 Interesting, so the signal starts narrow and then spreads out, and reaches about +/-2.3kHz deviation from center, with no hotspot down the middle. If you speed up the waterfall (is that an option for you), does it start to show any more detail? Quote
kidphc Posted November 20 Author Report Posted November 20 Interesting, so the signal starts narrow and then spreads out, and reaches about +/-2.3kHz deviation from center, with no hotspot down the middle. If you speed up the waterfall (is that an option for you), does it start to show any more detail?Not that we have seen it narrows back down and slows down in speed and width.It is intresting to see. It's right inside of the fm portion of the band plan. Just a bit higher than the atv portion.I thought it could be a smart meter but those are in the lower section of UHF same with radar which should be in the 1 GHz portion not 1.2 GHz of the 23cm band.Sent from my SM-S901U using Tapatalk Quote
dosw Posted November 20 Report Posted November 20 3 minutes ago, kidphc said: Not that we have seen it narrows back down and slows down in speed and width. It is intresting to see. It's right inside of the fm portion of the band plan. Just a bit higher than the atv portion. I thought it could be a smart meter but those are in the lower section of UHF same with radar which should be in the 1 GHz portion not 1.2 GHz of the 23cm band. Sent from my SM-S901U using Tapatalk This band plan? 1270.000-1276.000 FM, digital Repeater inputs, 25 kHz channel spacing, paired with 1282.000-1288.000 1270.000-1274.000 FM, digital Repeater inputs, 25 kHz channel spacing, paired with 1290.000-1294.000 (Regional option) Yeah, doesn't seem to correspond with FM; you would see a carrier down the middle. Digital is possible but what digital modes grow in bandwidth and then shrink; they're usually as fat as they can be within a set deviation. kidphc 1 Quote
SteveShannon Posted November 20 Report Posted November 20 1 hour ago, kidphc said: Attached a screen shot, tried to reattach the video filed.https://cloud.tapatalk.com/s/673e24f4dcc13/VID_20241120_124934%20%281%29.mp4https://cloud.tapatalk.com/s/673e24fb69dfc/VID_20241120_124934.mp4 Sent from my SM-S901U using Tapatalk What does it sound like in AM mode? Quote
kidphc Posted November 20 Author Report Posted November 20 What does it sound like in AM mode?I'll ask.Sent from my SM-S901U using Tapatalk Quote
kidphc Posted November 21 Author Report Posted November 21 We are pretty confident now it is a radar altimeter.Sent from my SM-S901U using Tapatalk Quote
WRUI365 Posted November 22 Report Posted November 22 Amateur radio 23CM 1240mhz to 1300 mhz, it could have been a DSTAR signal which Icom has radios that do dstar in 23cm. january_2016_spectrum_wall_chart_0.pdf Quote
kidphc Posted November 22 Author Report Posted November 22 Amateur radio 23CM 1240mhz to 1300 mhz, it could have been a DSTAR signal which Icom has radios that do dstar in 23cm. january_2016_spectrum_wall_chart_0.pdf I have seen dstar signals on the sdr. It wasn't anything like a digital fm signal.We confirmed as a nearby aircraft pass. Probably on a glide path. Which would make sense that a radar altimeter was engaged. The signal looked like a giant diamond on the waterfall.Sent from my SM-S901U using Tapatalk Quote
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