1st time hearing a [>=<]. Ears rang afterwards.

[Robert Gift]

Located on Denver's Kennedy Golf Course, E Hampden Ave and S Havana St in southeast Denver, near their main building, I barely managed to get to it in time for Denver's 2nd Wednesday, 11 a.m. test.

Very loud (too loud) at the ground.
I did not bring ear plugs because the FS 2001 I previously tried to record
was not too loud and I removed my ear plugs.
(The JVC miniDV camcorder for some reason did not record it.)

Does the 2001 do a better job in projecting sound horizontally with less going down to ground level?
Or does the [>=<] send too much sound to the ground?
I always said if I owned one I'd remove that middle band.

Next time, I shall wear earplugs or stand further away.

Just after starting record, the relays snapped closed in the pole-mounted boxes, starting the siren!

But during the recording, my brand new used JVC 20 gig Hard Drive camcorder developed a formatting problem and the recording ceased.

Restarted and captured 20 seconds before wind-down.

I wanted to record the electric meter turning to show startup and run power consumption, but there is no meter.

From further away I could hear air being sucked into the bottom of the siren!

[Elliott]

I'm assuming you are referring to a Federal SD-10, and yes, the dispersion angle of sound seems vertically wider than the more focused projection of a 2001. I was at Clayton Werden's shop one day for a test, and not only did I have to cup my ears, I could feel the energy in my feet, and could see pebbles skimming across his driveway. I usually dont need to if standing below a 2001, or even a T-128.

[Robert Gift]

Thanks Elliot.

I thought it an SD-10, but this one is dual tone.
Does that make it something else?

Sounded like a 10/12.

I couldn't plug my ears with my fingers because I was holding the camcorder. I did use left finger in left ear.

I think that downward dispersion is a design defect.

What caused the pebbles to skim? Air blowing out?
Or was it low enough to pull air in from the ground?

Thank you,

Addendum
Just saw your nice Hurricane photo. Thank you.
Had no idea it was so big.
Is that same as Thunderbolt except for having better projectors?
I would have made two complete exponential horns side by side.

[Elliott]

I thought all SD-10 were dual tone; to my knowledge, SD meant Special Dualtone. I've never heard a single tone model myself. Im sure Adam could clarify this, as I've heard it discussed before years back. Maybe 10 is the horsepower?

The Hurricane Projector is a little bigger than a T-Bolt. At least of my memory of standing next to a T-bolt on the ground at Clayton's shop. Too bad I dont have a side-by-side photo to compare.

[Robert Gift]

I must be mistaking model numbers.
(So what else is new?!)

I thought SD-10 meant 10 port stator.
SD-12 meant higher frequency 12 port.
Apparently I am thinking of something else.

I'll try to find a tripod at before December 13th so that I can have both hands free and keep the camcorder absolutely still.

Thank you,

[Justin]

If you have Adobe Premiere Pro, you can get a plug-in that almost eliminates an unsteady camera shot.

A good family friend of mine showed me this on a train he shot. At first the camera was all over the place, but when the plug-in worked it's magic on the video, it was almost as if he was using a tripod!

I think how it works is by getting rows of pixels from some frames and re-rendering the frame to make it 'steady'.

I don't know the name of the plug-in, nor how much it costs, but I know it's for Adobe Premiere Pro.

[Hacksaw]

The SD-10 are ALL dual tone with a perfect 4th interval. It uses a 10 hp motor. About the only big varieties on it were 1 or 3 phase, 240 or 480 volt, and slight differences in the housing.

A low mounted SD-10:
http://www.longislandfirealarm.com/SD10.jpg


An SD-10 restoration:
http://www.jmarcoz.com/service/sirenrefurb.htm

Yes, I have heard from others that the SD-10 is very loud underneath it.

And another person owns their own SD-10:
http://listserv.tempe.gov/admin/WA.EXE? ... =0&P=17258

[Robert Gift]

Thanks Hack.

Where is that "low mounted" SD-10 sculpture?
Wonder if it still contains the guts.
(I don't see the intake tube.)

If they are there, I would ask if I could extract the innards.

I thought it was a minor third interval!
I'll have to listen to the camcorder video.

I was looking fore the JMarcoz site. Thanks.
(They don't know the term for stator.)

What a neat letter.
The guy actually discoverd an SD-10 sitting in his garage?!!
(That would be a dream come true for me.)

That was really enjoyable.
Thank you.

[Hacksaw]

I don't know where that particular SD-10 is. There is another one mounter like it in Florida, but I don't have the picture.

I think that guy ordered & paid for the SD-10 he "found" in his garage.

[Robert Gift]

If you have Adobe Premiere Pro, you can get a plug-in that almost eliminates an unsteady camera shot.

Thanks, Justin.
I expected something like that to be developed and I expect it to use that clever principle. Sample some center picture pixels and keep them in the same relative position/orientation.

I am surprised TV programs about tornadoes and such don't use it.
I get really angry at all the jerkiness.
And on some shots, they PURPOSELY add shakiness to portray danger and fear - a cheap stupid gimmick.
I want to see detail, not fake drama.

The videos from the dash-mounted camcorder recording of our emergency runs are surprisingly steady and clear.
At first I expected vibration from the vehicle.
Then thought I had steadycam initiated.
But it is not.

To minimize camcoder vibration, the camcorder is firmly pushed against a suction cup attached to the windshield.

I tried our brand new used JVC hard drive camcorder attached to my hard hat with an L shaped bracket.
(Had to place some counter weight on the opposite side of the hard-hat.)
Lens was right at my eye level.
Surprisingly, my head was much more shaky than the dash-mount.