https://ideawaza.com/api.php?action=feedcontributions&feedformat=atom&user=69.10.211.111 2026-10-03T23:19:27Z User contributions MediaWiki 1.46.0 https://ideawaza.com/index.php?title=ATI_HPSS&diff=83150 2010-02-01T02:04:33Z

<p>69.10.211.111: /* Problems */</p> <hr /> <div>The ATI HPSS is an electronic outdoor warning siren manufactured by Acoustic Technology, Inc (ATI) that is used to alert people of Tornadoes, Hurricanes, Severe thunderstorms,fires and so on. It superseced an earlier rotating siren that ATI built. The introduction date is unknown, but thought to be around 1980. It consists of 4 speakers on the HPSS16 model, and 8 on the HPSS32 model. They can also be used as PA speakers. Despite functioning decently as a PA system, the siren function has been riddled with faults.<br /> <br /> ==Problems==<br /> The sirens have been riddled with problems since its introduction.<br /> <br /> *Tone - The ATIs use a 1000hz [[Sine wave|Sine]] wave, that creates a high pitched tone, but in [[San Francisco, California ]], many of their ATIs have the tone of an old Federal Signal STL-10. It should be noted a recent ATI system has used an improved tone, which has given adequate results.<br /> <br /> *Speakers - Many of San Francisco's ATIs have had blown speakers due to the low pitch STL-10 tone. This might be the fault of whoever installed the tone generators, as no siren speaker can handle such low pitched frequencies.<br /> [[Category:Sirens]]</div>

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