NYC emergency vehicle sirens

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Ant9270

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A "brake pedal" to stop it? What the holy heck are you talking about? The Q2B has an integrated brake that is operated by a switch supplying 12v...not a "brake pedal". You seem to be confused by the fact that many fire apparatus have a foot pedal to operate the siren in a hands-free manner; it's not a brake, and there's no need to even use the brake, simply let the rotor coast to a stop on its own.

I used to think the same thing. Then I went to one of the repair garages and saw a pedal titled “siren brake” it basically just reduces airflow to the siren and slows it down faster. Thought it was kind of a waste of space in my opinion.
 

GTR8000

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I used to think the same thing. Then I went to one of the repair garages and saw a pedal titled “siren brake” it basically just reduces airflow to the siren and slows it down faster. Thought it was kind of a waste of space in my opinion.
Nope, the brake is electrical, operated by a solenoid that gets 12v from a momentary switch. It physically slows the rotor from spinning, it does not "reduce airflow" in any way. I've been in the fire service for 25 years and have torn down and rebuilt more than my fair share of Q2B sirens.

Do not confuse the physical form the switches take with any particular function of the siren. In the end, it's all just 12v current flowing through a momentary switch of some kind, be that foot pedals or rockers on the dash or the horn/siren switch.

More info in this PDF:

https://sirennet.com/pdf/256A768K_Q2B-012P_install.pdf

A video showing the very basics of how a 12v power source is used for both activation of the motor and the brake. You can clearly hear the brake's solenoid clicking after the siren stops and power is removed from the brake wire.

 

Ant9270

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Nope, the brake is electrical, operated by a solenoid that gets 12v from a momentary switch. It physically slows the rotor from spinning, it does not "reduce airflow" in any way. I've been in the fire service for 25 years and have torn down and rebuilt more than my fair share of Q2B sirens.

Do not confuse the physical form the switches take with any particular function of the siren. In the end, it's all just 12v current flowing through a momentary switch of some kind, be that foot pedals or rockers on the dash or the horn/siren switch.

More info in this PDF:

https://sirennet.com/pdf/256A768K_Q2B-012P_install.pdf

A video showing the very basics of how a 12v power source is used for both activation of the motor and the brake. You can clearly hear the brake's solenoid clicking after the siren stops and power is removed from the brake wire.




Just realized my goof-up. The siren was an EQ2B, the electronic version. Instead of having a switch to “brake” the siren, the officer had a pedal. It was labeled siren brake. I can try to get a photo for you. Also, thanks for the information. I’m going to take a look now.
 

GTR8000

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Just realized my goof-up. The siren was an EQ2B, the electronic version. Instead of having a switch to “brake” the siren, the officer had a pedal. It was labeled siren brake. I can try to get a photo for you. Also, thanks for the information. I’m going to take a look now.
Oh, the fake2B, awful awful things. Those are completely controlled by a microprocessor, and can probably be "spun up" and "braked" using a smartphone! :rolleyes:

To be clear, either version can certainly have a pedal for the brake feature, however it's still just 12v being sent to the solenoid which physically slows the rotor from spinning on the real Q siren. I guess on the fake version it mimics the sound of the rotor decelerating quicker than it would freely spin down on the real thing.
 

mule1075

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The Q sirens on are 77 lafrances had a foot switch for the brake I would not call it a pedal it was more like a high/low beam switch. as well as on are 57 lafrance. On the 75 mack it was switch on the dash as well as the two new Rigs we received.
 

Bob1955

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A "brake pedal" to stop it? What the holy heck are you talking about? The Q2B has an integrated brake that is operated by a switch supplying 12v...not a "brake pedal". You seem to be confused by the fact that many fire apparatus have a foot pedal to operate the siren in a hands-free manner; it's not a brake, and there's no need to even use the brake, simply let the rotor coast to a stop on its own.
3085161, OK, I stand to be corrected because if YOU think that I have ALL day to argue with BABIES that cry on here all day, think twice.
I will always be happy to provide you with new frequencies for Westchester County, NY as I have LIVED her since 1955.
Have a great weeked "Troublemaker". Ha Ha
 

Bob1955

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New York State law DOES NOT require police vehicles to use sirens in emergency response. NYS VTL 1104 states:


Except for an authorized emergency vehicle operated as a police vehicle or bicycle, the exemptions herein granted to an authorized emergency vehicle shall apply only when audible signals are sounded from any said vehicle while in motion by bell, horn, siren, electronic device or exhaust whistle as may be reasonably necessary.

That is not the same thing as what was posted. And nice dig at NYPD too.
And the SAGA continues!
 

ff026

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3085161, OK, I stand to be corrected because if YOU think that I have ALL day to argue with BABIES that cry on here all day, think twice.
I will always be happy to provide you with new frequencies for Westchester County, NY as I have LIVED her since 1955.
Have a great weeked "Troublemaker". Ha Ha


Whaaa your the one who can’t take criticism or being wrong.

I don’t know how we will live without your fountain of misinformation!!
 

Danny37

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Actually, a lot of the complainers are the ones who moved there from the midwest, PennsytuckyWisconSota. They also complained about too much noise from bars when they took an apartment right over one. Zero sympathy. And the way people play music in their cars, and I'm guilty of it, the hi lo crap ain't going to cut it.

True but also the self-entitled Manhattan resident who are born and raised here thinking that their job-title gives them authority. When I had some odd side-jobs and was working as flagger on 76 st, some douche thought he was special and tried to run me over and pass through a closed work-zone because he was a "lawyer" and needed to see his client. I know some flaggers who refuse to work in certain parts of the city due to these people who think they're special because of their job-title.
 

Bob1955

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Bob-
The state laws apparently have changed. I learned them quite a while ago, from the troop safety officer of a NYSP barracks, who was giving emergency driving training to a new ambulance corp. At that time--and for many years afterward--the state law was "Lights and siren, code 3, or drive like everybody else". And at that time, the NYSP had a very simple policy about red light use as well. Abuse it for a donut run, you get a week of unpaid leave. Abuse it a second time, you got a month of unpaid leave. Abuse it for a third time, and you were an EXtrooper.
Their standards were usually higher than any other NYS law enforcement agency, including the NYPD. I've known some good cops, but also, too many sloppy bullies who signed up for the wrong reasons. And were shielded by The Blue Wall all too often. It isn't an easy job, but abiding by standards is a part of it.
Ever hear a siren start whooping JUST as a car comes to an intersection? They're plain stupid. If you don't start the siren up at least a couple of seconds in advance...how the hell is anyone supposed to know where it is echoing from? But if you run with the siren, the safe way, then Community Affairs grouses. (Hey, sometimes, someone needs to tell Community Affairs "TFB".)
Rred,
Your posting is the ONLY one that makes sense! A lot of cops just hit the siren at a intersections and yes, that is plain STUPID. My son doesn't do that. I have watched video of him going on a call on my Apple I phone 8 plus, he gets his own beat because A, he drives smart, B, even with lights/sirens, comes to a "complete" stop at a intersection, looks both ways, then goes through the light. You are ONE of the few on here that actually has brains, thank god! Have a great Tuesday.
 

APX8000

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And for argument sake, just blast the powercall, stand on the Q, and hang on the Grover Stuttertone chain. Never had an issue when I rode shotgun in the big red truck.


Sent from my iPhone using Tapatalk
 

62Truck

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This thread is starting to drift off topic. I ask everyone to be civil and keep it on topic before its closed. Thanks!
 

radioman2001

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This is an age old story even going back to the 70's when I was the factory rep for Federal Signs and Signals, and where you have the rich I am better than you who live in NYC and feel everyone should be seen and not heard unless spoken to. In 1978 I became embroiled in a fight with NYC, St Vincents Hospital EMS (now defunct) and some kook that said she could tell when a St Vinney's ambulance went down the block and that their siren was TOO LOUD, and she did live at 14st right next to the hospital so it was a noisy corner. Plus their siren was a PA-200 (one of the first) with 2 100 watt speakers mounted on the cab of a Chevy type I ambulance so yeah it was loud. What I didn't know and neither did anyone else is that NYC had a siren noise or noise standard (huh?) yea your siren could not exceed 85db at 10 ft. Well the ambient noise floor in NYC (Manhattan) on any given day is from 76 to 90db, so that standard meant that most sirens were useless unless you were 10 ft from it. The news story got squashed and we had to remove one speaker, and in the end I did find out that most of the city owned (HHC Ambulances) had resistors fitted on the speakers to meet the standard (they had PA15 and PA20 units which were 58 watt). I don't know if that standard even exists anymore.
Fast forward to today the whines the same and the outcome will be too. Unless you want the city to be liable for accidents as a result of not being heard this will all go away in a few months.

BTW the Federal Super Q is actually a Ford starter motor fitted with the compressor that makes the siren sound, and that's why there is a brake on the unit to slow it down. It actually can coast for almost 5min from full output until the motor stops.

Quote'
Whats wrong with the sound of a dying cat going down the street?!

Oh you mean the Motorola siren of the early 70's LOL
 

KK4JUG

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I was a Georgia LEO for over 30 years. By law, a vehicle is not an "emergency vehicle" unless both lights and siren are being used. Failing that, it's just another vehicle. For practical reasons, sometimes sirens are silenced before arriving at a scene leaving only the lights. Technically, it's not an emergency vehicle at that point. That's not to say a driver should't yield to them but the emergency vehicle loses some legal protections at that point.
 
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