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Author Topic: Long distance (2500 ft) Wireless Audio Transmission  (Read 7302 times)

Luke Robinson

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Long distance (2500 ft) Wireless Audio Transmission
« on: November 15, 2016, 11:36:12 am »

We have a reoccurring gig each year that involves a parade of boats decorated for christmas on a river. This year we have been asked to transmit the audio from the announcer to both sides of the river. The second location is about 2500 ft from the first according to google maps.

We have clean line of sight and are elevated about 30-40 ft above the river on both sides.

Usually I use an IEM system for delay towers and the like but they seem to max out between 300 and 400 ft. I clearly need more power here.

Does anyone know of a solution for transmitting audio over this kind of distance cleanly?

Thanks,
Luke
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Tim McCulloch

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #1 on: November 15, 2016, 11:42:24 am »

We have a reoccurring gig each year that involves a parade of boats decorated for christmas on a river. This year we have been asked to transmit the audio from the announcer to both sides of the river. The second location is about 2500 ft from the first according to google maps.

We have clean line of sight and are elevated about 30-40 ft above the river on both sides.

Usually I use an IEM system for delay towers and the like but they seem to max out between 300 and 400 ft. I clearly need more power here.

Does anyone know of a solution for transmitting audio over this kind of distance cleanly?

Thanks,
Luke

We have used Lectrosonics IFB transmitter (250mW) and appropriate Lectro receiver.  We used helical antenna on the transmit side and LPDA (paddle) antenna on the receive end.  We rent a package from Bexel Broadcast in VA (formerly the Systems Wireless shop).  Flawless performance.
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Mike Pyle

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #2 on: November 15, 2016, 12:38:52 pm »

We have a reoccurring gig each year that involves a parade of boats decorated for christmas on a river. This year we have been asked to transmit the audio from the announcer to both sides of the river. The second location is about 2500 ft from the first according to google maps.

We have clean line of sight and are elevated about 30-40 ft above the river on both sides.

Usually I use an IEM system for delay towers and the like but they seem to max out between 300 and 400 ft. I clearly need more power here.

Does anyone know of a solution for transmitting audio over this kind of distance cleanly?

Thanks,
Luke

That is within the spec for Xirium Pro, if you have the budget for it.
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David Sturzenbecher

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #3 on: November 15, 2016, 12:41:59 pm »

That is within the spec for Xirium Pro, if you have the budget for it.

Too bad they have all been recalled.


Sent from my iPhone using Tapatalk
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Steve Payne

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #4 on: November 15, 2016, 12:48:28 pm »

We have a reoccurring gig each year that involves a parade of boats decorated for christmas on a river. This year we have been asked to transmit the audio from the announcer to both sides of the river. The second location is about 2500 ft from the first according to google maps.

We have clean line of sight and are elevated about 30-40 ft above the river on both sides.

Usually I use an IEM system for delay towers and the like but they seem to max out between 300 and 400 ft. I clearly need more power here.

Does anyone know of a solution for transmitting audio over this kind of distance cleanly?

Thanks,
Luke

Is price an object?  Neutrk Xirium Pro is purpose built for just this application and likely the king of the hill. Rated for up to 1/2 mile line of site transmission.  We have used this system all season (though not at this extreme distance) and it is stupid easy to set up, rock solid in performance and sounds like it's hard wired.

http://www.neutrik.us/en-us/news/xirium_pro
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Steve Payne
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Steve Payne

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #5 on: November 15, 2016, 12:50:34 pm »

Too bad they have all been recalled.


Sent from my iPhone using Tapatalk

Yep.  Circuit boards delaminating.  They hope to have the problem solved and reshipping before end of year is what I hear.  It's a great system.
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Jason Lavoie

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #6 on: November 15, 2016, 02:56:57 pm »

We have used Lectrosonics IFB transmitter (250mW) and appropriate Lectro receiver.  We used helical antenna on the transmit side and LPDA (paddle) antenna on the receive end.  We rent a package from Bexel Broadcast in VA (formerly the Systems Wireless shop).  Flawless performance.

Any particular reason to use two different antennas?
wouldn't you want the polarization to match?

Jason
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Tim McCulloch

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #7 on: November 15, 2016, 04:09:47 pm »

Any particular reason to use two different antennas?
wouldn't you want the polarization to match?

Jason

I had to go back and look at the invoice.  We had 2 systems, one with helical and the other with paddles.  I somehow put them together in my memory....  Damn this getting old thing is getting old.
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"Practicing an art, no matter how well or badly, is a way to make your soul grow, for heaven's sake. Sing in the shower. Dance to the radio. Tell stories. Write a poem to a friend, even a lousy poem. Do it as well as you possible can. You will get an enormous reward. You will have created something."  - Kurt Vonnegut

Tim Woodworth

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #8 on: November 15, 2016, 04:18:16 pm »

Hey Luke,

You can reach these distances by using the technique called point to point with a Shure PSM900 unit as the transmitter, and a Shure UHF-R as the receiver. We use this all of the time for large scale events that we want a wireless solution. just Google "Shure point to point" and you will find a PDF that explains how to put the PSM900 into the PTP mode. Obviously the two units must be tuned to the same frequency, so they must be in the same freq. range. Helical on the 900 and high gain paddles on the UHF-R and you will be good to go.

I hope this helps. Let me know if you have any questions.


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Tim Woodworth
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Luke Robinson

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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #9 on: November 15, 2016, 05:18:44 pm »

Hey Luke,

You can reach these distances by using the technique called point to point with a Shure PSM900 unit as the transmitter, and a Shure UHF-R as the receiver. We use this all of the time for large scale events that we want a wireless solution. just Google "Shure point to point" and you will find a PDF that explains how to put the PSM900 into the PTP mode. Obviously the two units must be tuned to the same frequency, so they must be in the same freq. range. Helical on the 900 and high gain paddles on the UHF-R and you will be good to go.

I hope this helps. Let me know if you have any questions.

Sounds interesting, I am going to have to do some research, thanks for the tip that is gear that is redially available.

Does anyone know of a rental house in the Philadelphia area that may have the Lectrosonics gear. I was going to call tim's contact in VA and see if they would be willing to do a rental via UPS but if i can get it locally all the better.

Thanks to all for your help.

Luke
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Re: Long distance (2500 ft) Wireless Audio Transmission
« Reply #9 on: November 15, 2016, 05:18:44 pm »


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