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Throwing long range bluetooth


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#1 Master_Scythe

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Posted 31 January 2017 - 02:58 PM

So, legalities aside, does anyone know how to throw\receive long range bluetooth?

By long range, I mean about 50m with one wall between.

 

I want to use bluetooth headphones from the Gym across the street, connecting to a computer.

 

I mean worst case I get an old bluetooth phone and a 128GB microSD card and leave it INSIDE the gym while I train, but since I'm only across the street I like to travel with me + towel, and thats it.


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#2 Rybags

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Posted 31 January 2017 - 03:13 PM

It would seem that long range BT has been around a while - seems too plenty of the USB dongles have totally the wrong sort of antenna setup which a quick/dirty mod can fix http://www.instructa...oth-d/?ALLSTEPS

 

As for the headphones, there's where I see a possible problem.  Pretty sure all BT comms is constant 2-way though for speaker devices would likely be little more than a "I'm still here" reply once in a while.  I suppose all you can do is experiment yourself or do some searching to see how others coped.



#3 @~thehung

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Posted 31 January 2017 - 04:57 PM


yeah, i really wouldnt know, but it wouldnt surprise me if the transceiver in the headphones isnt a major stumbling block for A2DP

relevant: https://electronics....luetooth-dongle
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#4 Jeruselem

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Posted 31 January 2017 - 05:14 PM

From reading, you'd need like bluetooth 4 or 5. But then there's other complicating factors common with wireless transmission which reduce range.


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#5 Master_Scythe

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Posted 01 February 2017 - 08:43 AM

I can stick with FM at the end of the day, it's just that there aren't really any small FM headsets, where wireless bluetooth headsets are now tiny.

 

I get my home WiFi from the Gym, so I could look into something there.


Wherever you go in life, watch out for Scythe, the tackling IT support guy.

"I don't care what race you are, not one f*cking bit, if you want to be seen as a good people, you go in there and you f*ck up the people who (unofficially) represent you in a negative light!"


#6 SquallStrife

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Posted 06 February 2017 - 12:59 PM

Hack time.

Bluetooth is 2.4GHz, attach a wifi antenna to whatever your "base station" is. Cheapo dongle from eBay connected to a PC would be ideal.
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#7 Master_Scythe

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Posted 06 February 2017 - 01:10 PM

So being 2.4ghz, a 6db whip designed for Wifi would be ideal?

I have a few laying around.

 

I might even try a 'standard' antenna from a wifi modem....


Wherever you go in life, watch out for Scythe, the tackling IT support guy.

"I don't care what race you are, not one f*cking bit, if you want to be seen as a good people, you go in there and you f*ck up the people who (unofficially) represent you in a negative light!"


#8 Rybags

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Posted 06 February 2017 - 04:10 PM

I imagine the wattage of BT would pale compared to Wifi.  Funny thing is, the crappy old DLink routerI used to have had the best Wifi range and is the only one I had that let you change the amount of Wifi transmission power.

 

Also in my experience BT is a lot less robust, Wifi can put up with plenty of interference and you just lose speed where BT and the generic 2.4 GHz devices just stop working entirely.



#9 Jeruselem

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Posted 06 February 2017 - 09:44 PM

BT was never designed for long range, unlike WiFi.

Cortana at your service


#10 Master_Scythe

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Posted 07 February 2017 - 11:12 AM

im trying to reach say..... 30m with one wall.

So it's not beyond antenna amplifier range I think....

 

Might get an amplifier kit for 2.4ghz frequency from jaycar....


Wherever you go in life, watch out for Scythe, the tackling IT support guy.

"I don't care what race you are, not one f*cking bit, if you want to be seen as a good people, you go in there and you f*ck up the people who (unofficially) represent you in a negative light!"


#11 SquallStrife

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Posted 07 February 2017 - 03:55 PM

So being 2.4ghz, a 6db whip designed for Wifi would be ideal?
I have a few laying around.
 
I might even try a 'standard' antenna from a wifi modem....


Perhaps.

As Ry says, the Tx power is very low, so your antenna will have to be highly directional to meaningfully increase the range.

An amplifier /might/ work, bearing in mind that BT is fairly chatty in both directions, even when using the A2DP profile.
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#12 Master_Scythe

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Posted 07 February 2017 - 04:14 PM

 

So being 2.4ghz, a 6db whip designed for Wifi would be ideal?
I have a few laying around.
 
I might even try a 'standard' antenna from a wifi modem....


Perhaps.

As Ry says, the Tx power is very low, so your antenna will have to be highly directional to meaningfully increase the range.

An amplifier /might/ work, bearing in mind that BT is fairly chatty in both directions, even when using the A2DP profile.

 

 

perhaps I should build a Cantenna?


Wherever you go in life, watch out for Scythe, the tackling IT support guy.

"I don't care what race you are, not one f*cking bit, if you want to be seen as a good people, you go in there and you f*ck up the people who (unofficially) represent you in a negative light!"


#13 SquallStrife

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Posted 08 February 2017 - 01:24 PM

Cheap enough that it's worth a try!
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