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Author Topic: Bluetooth thru steel rack door?  (Read 5267 times)

Joseph D. Macry

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Bluetooth thru steel rack door?
« on: March 09, 2016, 03:29:37 pm »

I occasionally supply a Bluetooth-enabled CD player (Tascam CD-200BT) in a rack.
I've always tried to spec a plexiglas door to allow good reception at the front of the unit.

But now a school says they want solid steel door on the new Gymnasium rack because flying basketballs might break the Plexiglas. (Not worried about athletes hitting the rack, as it's tucked in beside the bleachers.)

Do you think the Tascam would receive the Bluetooth signal from Coach's iPhone if the rack is closed with steel door? Coach could be anywhere about the Gym, which is sized for a single basketball court.

I noticed that Denon DN-300Z CD/BT/AM/FM deck has a remote Bluetooth antenna. Never played with that model.
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Joseph Macry,
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Rob Spence

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Re: Bluetooth thru steel rack door?
« Reply #1 on: March 09, 2016, 04:14:50 pm »

I occasionally supply a Bluetooth-enabled CD player (Tascam CD-200BT) in a rack.
I've always tried to spec a plexiglas door to allow good reception at the front of the unit.

But now a school says they want solid steel door on the new Gymnasium rack because flying basketballs might break the Plexiglas. (Not worried about athletes hitting the rack, as it's tucked in beside the bleachers.)

Do you think the Tascam would receive the Bluetooth signal from Coach's iPhone if the rack is closed with steel door? Coach could be anywhere about the Gym, which is sized for a single basketball court.

I noticed that Denon DN-300Z CD/BT/AM/FM deck has a remote Bluetooth antenna. Never played with that model.

In general, putting a radio behind a steel door is a bad idea. Bluetooth isn't exactly a high power radio in the first place. It is designed for short distances.
I wouldn't do it if it were me.


Sent from my iPad using Tapatalk HD
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rob at lynxaudioservices dot com

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Cailen Waddell

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Re: Bluetooth thru steel rack door?
« Reply #2 on: March 09, 2016, 05:19:39 pm »

I have put cd-200bt into dance studios in steel racks with steel doors.  Your lucky to get 30'.  Lucky for me it was an existing rack and we were planning to remove the door anyway.


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Stephen Swaffer

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Re: Bluetooth thru steel rack door?
« Reply #3 on: March 09, 2016, 05:34:54 pm »

Maybe use an impact resistant lexan?  There are tougher plastics than plexiglass that would be more RF friendly than steel?
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Steve Swaffer

Lee Douglas

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Re: Bluetooth thru steel rack door?
« Reply #4 on: March 09, 2016, 06:01:00 pm »

I've used something like this to remotely locate a Bluetooth receiver through conduit to a metal box in a more centralized location away from the main installation rack.  While it worked fine, you would still be pressed to get more than 30' out of it, per standard Bluetooth spec.  Maybe a lockable compartment near the rack that the coach could place his phone in.  Of course if they're looking for transport control as well...

http://www.amazon.com/Signa-ST-WBT1-In-wall-Bluetooth-Receiver/dp/B00OY8CWDC
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Scott Carneval

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Re: Bluetooth thru steel rack door?
« Reply #5 on: March 10, 2016, 11:18:59 pm »

Have you thought about using an Apple Airport Express and sending audio from the Coach's phone via Airplay?

What about a perforated steel door? It would probably provide better reception than solid steel.
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Lee Buckalew

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Re: Bluetooth thru steel rack door?
« Reply #6 on: March 11, 2016, 08:39:37 am »

What about a perforated steel door? It would probably provide better reception than solid steel.

2.4GHz wavelength is approx 4.92 inches.
Unless the perforations are significantly larger than approximately 0.49" in diameter then the door may be solid (Faraday cage) to the RF wavelength for Bluetooth (this is the same frequency at which microwave ovens generate their frequencies for cooking, think about the perforated door), however, much of this is dependent on the metal itself, any non-sealed paths that are present, etc., etc.,

It may be worth a test if that is possible.

Lee
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Lee Buckalew
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david albert

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Re: Bluetooth thru steel rack door?
« Reply #7 on: March 11, 2016, 12:21:44 pm »

Take a look at a microwave door, usually perforated, and no microwaves come out!  Microwaves ovens operate at 2.4Ghz too!

2.4GHz wavelength is approx 4.92 inches.
Unless the perforations are significantly larger than approximately 0.49" in diameter then the door may be solid (Faraday cage) to the RF wavelength for Bluetooth (this is the same frequency at which microwave ovens generate their frequencies for cooking, think about the perforated door), however, much of this is dependent on the metal itself, any non-sealed paths that are present, etc., etc.,

It may be worth a test if that is possible.

Lee
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Lee Buckalew

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Re: Bluetooth thru steel rack door?
« Reply #8 on: March 11, 2016, 02:16:53 pm »

Take a look at a microwave door, usually perforated, and no microwaves come out!  Microwaves ovens operate at 2.4Ghz too!

That's exactly what I said.  Unless the perforations are GREATER than 0.49" in diameter the perforated door will be solid to the 2.4GHz frequency.  However there are some other factors at play such as how well sealed other pathways are, etc.

Lee
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Lee Buckalew
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Joseph D. Macry

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Re: Bluetooth thru steel rack door?
« Reply #9 on: March 11, 2016, 09:07:11 pm »

Maybe use an impact resistant lexan?  There are tougher plastics than plexiglass that would be more RF friendly than steel?

It's whatever Middle Atlantic puts in the product. I don't manufacture the racks myself, just assemble and install.
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Joseph Macry,
Austin, TX

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Re: Bluetooth thru steel rack door?
« Reply #9 on: March 11, 2016, 09:07:11 pm »


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