Here's a new one for me SDR

[kidphc]

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

 

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[dosw]

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

 

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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.

[kidphc]

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.mp4

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[dosw]

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?

[kidphc]

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.

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[dosw]

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.

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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.

[SteveShannon]

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

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What does it sound like in AM mode?

[kidphc]

What does it sound like in AM mode?

I'll ask.

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[kidphc]

We are pretty confident now it is a radar altimeter.

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[WRUI365]

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

 

[kidphc]

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.

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