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DJ2226
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Real Name: Dennis Seldon
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"New" 435 Hz Whelen 2910 - Columbus, GA

Thu May 07, 2020 4:16 am

A while back I posted pictures here of one of our sirens that took a hit and ate dirt due to a construction accident. Siren went yeet and exploded into a hundred pieces on impact. Last year the replacement siren was installed, however it wasn't until recently that it was actually hooked up to power.

Here's the video. This is the first 2910 to be filmed in the wild with this older style controller. Besides the missing hiss of the screens of the older 2800 series design, this siren has a very raspy sound. I believe that is the EZ-Pull driver doors resonating with the sound. It's something I've noticed with other 2900 series sirens on 560 Hz controls compared to the 2810s I've recorded on upgraded panels. The 2810s always had the hiss but put out a much more flat tone, while the 2900 series sirens tended to put out one that was more raspy. It's even more noticeable with the lower pitch. The hissing also blocked out some of the clipping these older controls used to do in alert due to the tone generator not taking that particular pitch too well; all 435 Hz sirens are factory set for 450 Hz but drop by 15 Hz due to bugs in the firmware. With the hissing gone now the clipping is very audible.



https://www.youtube.com/watch?v=LXUqfbls8SY
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Re: "New" 435 Hz Whelen 2910 - Columbus, GA

Thu May 07, 2020 5:45 pm

I can never remember - why does the pitch on those units drop from 450Hz? Doesn't it have something to do with silent testing?
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uncommonsense

Re: "New" 435 Hz Whelen 2910 - Columbus, GA

Thu May 07, 2020 6:23 pm

This is the first 2910 to be filmed in the wild with this older style controller.
Not true. Whelen shipped the lower pitched 2020 with some of the earliest 2900 units. Note this 2908 in Brentwood, MO, which was installed May of 2007 (first omni in St. Louis, County and one of the earliest 2900s off the line). This unit replaced a broken down 612 and the hissing/clipping is horrendous just like you describe in your video.



https://www.youtube.com/watch?v=GWqxMLm9e_A

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DJ2226
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Re: "New" 435 Hz Whelen 2910 - Columbus, GA

Fri May 08, 2020 5:29 am

uncommonsense wrote:
Thu May 07, 2020 6:23 pm
This is the first 2910 to be filmed in the wild with this older style controller.
Not true. Whelen shipped the lower pitched 2020 with some of the earliest 2900 units. Note this 2908 in Brentwood, MO, which was installed May of 2007 (first omni in St. Louis, County and one of the earliest 2900s off the line). This unit replaced a broken down 612 and the hissing/clipping is horrendous just like you describe in your video.
I was talking about the actual model itself. There are a number of videos of the 2900 series in general running on this controller (mostly 2905s or 2906s from the Cook Nuclear System), but there hasn't been one of the 2910 specifically. I'm sure there are more of them out there, but they are very rare since the 2020's firmware was revised twice shortly after the series launched on the tone side of things to get the tone up to 560 Hz. This one happened to have underwent a head swap, so I kinda got lucky with that.

On a side note I think the 2900 series was out a little prior to May 2007. There were spec sheets of the series using the old SPL and range ratings from the 2800 series. The 560 Hz alert tone is where the performance bump came from, and it was pushed out on the 2020 later in 2007 with a few of the earliest featuring a buggy version of the firmware that caused the pitch to fall to 530 Hz. On the topic of STL Co. they had at least one 2908 in the mix that ran at 530 Hz.
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