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<blockquote data-quote="SMS" data-source="post: 2167643" data-attributes="member: 42">That&#039;s actually exactly how jamming works;&nbsp; overwhelm the receiver with noise above the threshold of the receiver, not shut down the transmitter.&nbsp; Test messages require lower bandwidth and less power and can sometimes still be rcvd when regular calls are blocked.&nbsp; But that all depends on authorities using mobile jammers versus just getting the cell companies to shut down cell sites...or an overwhelmed system like you mentioned.&nbsp; Probably a little bit of all of the above.&nbsp; EOD teams probably&nbsp; deployed mobile jammers while &quot;exploiting&quot; the site in hopes of preventing any secondaries set up for the express purpose of hitting first responders/investigators.My bet is on crude, blackpowder or other simple device in a small package that could easily be deposited in trash cans without drawing attention.&nbsp; That area was full of security due to the race....but a passer-by dropping a large fast food bag into a can wouldn&#039;t draw any attention, or a backpack dropped on the ground in the middle of the crowd watching the race finish etc...The blasts were small, casualties were light for an event like this.&nbsp; We got lucky.Prayers out to the fallen...</blockquote>

[QUOTE="SMS, post: 2167643, member: 42"] That's actually exactly how jamming works; overwhelm the [I]receiver[/I] with noise above the threshold of the receiver, not shut down the transmitter. Test messages require lower bandwidth and less power and can sometimes still be rcvd when regular calls are blocked. But that all depends on authorities using mobile jammers versus just getting the cell companies to shut down cell sites...or an overwhelmed system like you mentioned. Probably a little bit of all of the above. EOD teams probably deployed mobile jammers while "exploiting" the site in hopes of preventing any secondaries set up for the express purpose of hitting first responders/investigators. My bet is on crude, blackpowder or other simple device in a small package that could easily be deposited in trash cans without drawing attention. That area was full of security due to the race....but a passer-by dropping a large fast food bag into a can wouldn't draw any attention, or a backpack dropped on the ground in the middle of the crowd watching the race finish etc... The blasts were small, casualties were light for an event like this. We got lucky. Prayers out to the fallen... [/QUOTE]

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