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Seoul's Possible HLS System
Posted: Thu Aug 08, 2024 3:17 pm
by CarterMasterAlt
I was looking at my forms for my SK siren map, I saw someone from the Hochleistungssirene website and he said there are possible HLS locations via by this video
https://www.youtube.com/watch?v=bc9x6gltrnc and if any of you find it. He told me to email him the locations so he can add it to the Hochleistungssirene website.
Sorry if this doesnt make sense. Basically I'm saying there are possible HLS sirens in Seoul by the video url and if anyone finds remaining sirens or removed sirens, Schmidt will add it to the Hochleistungssirene
Re: Seoul's Possible HLS System
Posted: Tue Jan 28, 2025 8:11 pm
by clm 10 12
Pardon the bump, but I figured out a few things about that video. The building that it was filmed from is located at coordinates 37.542061, 127.010302. There is a siren location about 150m away, which can actually be seen twice in the video. It's on top of a raised section of roof on the Okjung Middle School building, which is the shorter building with the green roof, across the street from the filming location. The building and siren can be seen from about 0:12-0:20 and again from 0:50-1:00. The siren is visible on Streetview. It is now a loudspeaker array electronic siren of some kind, but previously (in older Streetview imagery) there was what looks to be a 5 cell Whelen omnidirectional there. The Whelen was replaced sometime between 2009 and 2015. I'm wondering if it's possible that the siren heard in the video is actually the Whelen playing a custom tone of some kind that happens to sound a lot like an HLS 273 with a non functioning speed controller? While it is possible that that there was an HLS X73 there before the Whelen, and it is hard to see in the video with the low resolution, I definitely do think, from what I can make out, that it looks a lot more like a Whelen than an HLS at the time of filming.
Re: Seoul's Possible HLS System
Posted: Tue Jan 28, 2025 10:15 pm
by HudsonRiverSirens
clm 10 12 wrote: ↑Tue Jan 28, 2025 8:11 pm
Pardon the bump, but I figured out a few things about that video. The building that it was filmed from is located at coordinates 37.542061, 127.010302. There is a siren location about 150m away, which can actually be seen twice in the video. It's on top of a raised section of roof on the Okjung Middle School building, which is the shorter building with the green roof, across the street from the filming location. The building and siren can be seen from about 0:12-0:20 and again from 0:50-1:00. The siren is visible on Streetview. It is now a loudspeaker array electronic siren of some kind, but previously (in older Streetview imagery) there was what looks to be a 5 cell Whelen omnidirectional there. The Whelen was replaced sometime between 2009 and 2015. I'm wondering if it's possible that the siren heard in the video is actually the Whelen playing a custom tone of some kind that happens to sound a lot like an HLS 273 with a non functioning speed controller? While it is possible that that there was an HLS X73 there before the Whelen, and it is hard to see in the video with the low resolution, I definitely do think, from what I can make out, that it looks a lot more like a Whelen than an HLS at the time of filming.
I am 99% sure the 5 cell siren is an LRAD 360X, but there is something entirely Whelen-like about that signal. I'm not 100% sure they were trying to mimic an HLS sound. We'll need to do some digging
Re: Seoul's Possible HLS System
Posted: Wed Jan 29, 2025 1:30 am
by clm 10 12
HudsonRiverSirens wrote: ↑Tue Jan 28, 2025 10:15 pm
clm 10 12 wrote: ↑Tue Jan 28, 2025 8:11 pm
Pardon the bump, but I figured out a few things about that video. The building that it was filmed from is located at coordinates 37.542061, 127.010302. There is a siren location about 150m away, which can actually be seen twice in the video. It's on top of a raised section of roof on the Okjung Middle School building, which is the shorter building with the green roof, across the street from the filming location. The building and siren can be seen from about 0:12-0:20 and again from 0:50-1:00. The siren is visible on Streetview. It is now a loudspeaker array electronic siren of some kind, but previously (in older Streetview imagery) there was what looks to be a 5 cell Whelen omnidirectional there. The Whelen was replaced sometime between 2009 and 2015. I'm wondering if it's possible that the siren heard in the video is actually the Whelen playing a custom tone of some kind that happens to sound a lot like an HLS 273 with a non functioning speed controller? While it is possible that that there was an HLS X73 there before the Whelen, and it is hard to see in the video with the low resolution, I definitely do think, from what I can make out, that it looks a lot more like a Whelen than an HLS at the time of filming.
I am 99% sure the 5 cell siren is an LRAD 360X, but there is something entirely Whelen-like about that signal. I'm not 100% sure they were trying to mimic an HLS sound. We'll need to do some digging
Looking at pictures of an LRAD 360X compared to the siren on the building, I could definitely see it being one. I think the tone probably wasn't deliberately designed to sound like an HLS 273, seems more like a coincidence. A healthy HLS 273 would actually be lower in frequency (420hz or so) and have a good bit longer wind down. The tone in the video sounds like an HLS 273 with old bearings and a failed speed controller. Given that the HLS X73 series is probably the most electronic sounding mechanical siren out there, I can see how a basic single tone electronic siren signal could inadvertently end up sounding just like one under the right conditions.
Re: Seoul's Possible HLS System
Posted: Wed Jan 29, 2025 9:56 am
by KoreanCo
I think video is recorded in February 27, 2000, 2pm. exact location is geukdong green 102 at oksudong.
HLS-X73 installed in 1973 and replaced to LRAD-360X in 2000, But not confirmed it yet. replaced to A&D Engineering T24 in 2014.
the okjeong middle school's T24 unit had a 24 speakers. watt is 2400W.
T24 can had 1 to 36 speakers.
Re: Seoul's Possible HLS System
Posted: Wed Jan 29, 2025 11:59 am
by KoreanCo
Re: Seoul's Possible HLS System
Posted: Wed Jan 29, 2025 6:09 pm
by Stevan Z
Something about that sounds completely off. My bet is an electronic siren possibly playing a HLS recording. If it was actually a HLS-X73 or F-71, it would be must louder and more raspy being practically right in front of the camera.
Re: Seoul's Possible HLS System
Posted: Wed Jan 29, 2025 6:24 pm
by PelicanStateSirens
It def sounds electronic in the recording. You can tell by the wind-down.
Re: Seoul's Possible HLS System
Posted: Thu Jan 30, 2025 4:39 am
by HudsonRiverSirens
KoreanCo wrote: ↑Wed Jan 29, 2025 9:56 am
I think video is recorded in February 27, 2000, 2pm. exact location is geukdong green 102 at oksudong.
HLS-X73 installed in 1973 and replaced to LRAD-360X in 2000, replaced to A&D Engineering T24 in 2014.
the okjeong middle school's T24 unit had a 24 speakers. watt is 2400W.
T24 can had 1 to 36 speakers.
this is confirmed?
Re: Seoul's Possible HLS System
Posted: Thu Jan 30, 2025 7:15 am
by KoreanCo
HudsonRiverSirens wrote: ↑Thu Jan 30, 2025 4:39 am
KoreanCo wrote: ↑Wed Jan 29, 2025 9:56 am
I think video is recorded in February 27, 2000, 2pm. exact location is geukdong green 102 at oksudong.
HLS-X73 installed in 1973 and replaced to LRAD-360X in 2000, replaced to A&D Engineering T24 in 2014.
the okjeong middle school's T24 unit had a 24 speakers. watt is 2400W.
T24 can had 1 to 36 speakers.
this is confirmed?
No. not confirmed it yet.