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Author Topic: IEM Antenna combiner (when is it necessary?)  (Read 24122 times)

Nate Zifra

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IEM Antenna combiner (when is it necessary?)
« on: December 11, 2015, 09:29:39 AM »

I'm sure the answer to this depends.  Our band is now looking at Shure PSM300 units.  At the most, we would have 3 transmitters.  Uses would be mainly on small stages and bars, and would travel with the band.  The idea is to rack them side stage.  Other wireless in use would be 3 Line 6 instrument units (G30), and two older Shure PGX mic units. 

With three transmitters for IEM, would the combiner be a necessity?  Thank you for help, and please excuse my ignorance.

Nathan
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Jerome Malsack

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #1 on: December 11, 2015, 10:33:02 AM »

Cost,  The rack the transmitters are mounted into.   Height is your friend in Wireless,  getting the combiner in the rack and sending up one antenna on a stand will spead up the setup and tear down.

Transmitters need to be away from other receivers and computer or digital gear.  Using the remote antenna and a cable to connect will make your system more reliable.  20 to 30 inchs between transmitters and receiver antenna.  Digital effects, Digital mixers and other devices can cause interference.  So the remote getting antennae high and separated some would say yes very smart move. 

Looks good to have one antenna.  Transmit,  two more for the receivers.  But Your receivers for the instruments and mics may not have removable antenna with a distribution amp.   This can make the stage area look cluttered.  If the receivers can be connected to an antenna distribution and you can use two antenna connected tot he distribution to give to each receiver than you will be making the setup and tear down quicker, along with a cleaner stage by having just the three antennae.
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Keith Broughton

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #2 on: December 11, 2015, 10:45:45 AM »

Cost,  The rack the transmitters are mounted into.   Height is your friend in Wireless,  getting the combiner in the rack and sending up one antenna on a stand will spead up the setup and tear down.

Transmitters need to be away from other receivers and computer or digital gear.  Using the remote antenna and a cable to connect will make your system more reliable.  20 to 30 inchs between transmitters and receiver antenna.  Digital effects, Digital mixers and other devices can cause interference.  So the remote getting antennae high and separated some would say yes very smart move. 

Looks good to have one antenna.  Transmit,  two more for the receivers.  But Your receivers for the instruments and mics may not have removable antenna with a distribution amp.   This can make the stage area look cluttered.  If the receivers can be connected to an antenna distribution and you can use two antenna connected tot he distribution to give to each receiver than you will be making the setup and tear down quicker, along with a cleaner stage by having just the three antennae.
All very good points!
Keep your transmitter and receiver antennas apart.
And remember that antennae may only work on insects ;-)
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Henry Cohen

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #3 on: December 11, 2015, 06:36:54 PM »

And remember that antennae may only work on insects ;-)

Give that man a cheroot!
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Henry Cohen

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Henry Cohen

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #4 on: December 11, 2015, 06:41:19 PM »

Digital effects, Digital mixers and other devices can cause interference.  So the remote getting antennae high and separated some would say yes very smart move.

Interference is an issue at the receiver, not the transmitter.

Another factor to keep in mind is that a properly designed and built combiner will reduce transmitter intermodulation products by significantly reducing the amount of RF energy from any two of the transmitters getting into the third's final power amplifier through its antenna.
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Henry Cohen

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John Sulek

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #5 on: December 11, 2015, 08:33:46 PM »

All very good points!
Keep your transmitter and receiver antennas apart.
And remember that antennae may only work on insects ;-)

And don't point the transmit antenna at the receiver antenna(s).
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Jerome Malsack

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #6 on: December 12, 2015, 06:32:05 PM »

http://grammarist.com/usage/antennae-antennas/

In the U.S. and Canada, the plural of the noun antenna is antennae when the word denotes the flexible sensory appendages on insects and other animals. But when the word refers to a metallic apparatus for sending or receiving electromagnetic signals, American and Canadian writers usually use antennas. British writers tend to use antennae for both purposes. Australian and New Zealand writers are split on the matter, using both plurals for the metallic devices.
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brian maddox

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #7 on: December 12, 2015, 10:32:02 PM »

http://grammarist.com/usage/antennae-antennas/

In the U.S. and Canada, the plural of the noun antenna is antennae when the word denotes the flexible sensory appendages on insects and other animals. But when the word refers to a metallic apparatus for sending or receiving electromagnetic signals, American and Canadian writers usually use antennas. British writers tend to use antennae for both purposes. Australian and New Zealand writers are split on the matter, using both plurals for the metallic devices.

The United States, the United Kingdom, Australia, and Canada continue to be divided by a common language.
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Keith Broughton

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #8 on: December 13, 2015, 06:56:17 AM »

http://grammarist.com/usage/antennae-antennas/

In the U.S. and Canada, the plural of the noun antenna is antennae when the word denotes the flexible sensory appendages on insects and other animals. But when the word refers to a metallic apparatus for sending or receiving electromagnetic signals, American and Canadian writers usually use antennas. British writers tend to use antennae for both purposes. Australian and New Zealand writers are split on the matter, using both plurals for the metallic devices.
Interesting! It makes sense but as has been the case, the  Americans tend to ...er..."adjust" the language to suit them.
Here in Canada we kind of have to go along to some extent to keep the peace  ;D
Now don't get me started on Lectern vs Podium 
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Mac Kerr

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Re: IEM Antenna combiner (when is it necessary?)
« Reply #9 on: December 13, 2015, 12:50:30 PM »

Now don't get me started on Lectern vs Podium

The O.E.D. lists both as correct for that thing you stand behind to speak. The thing you stand on to conduct an orchestra is only a podium.

Mac
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Re: IEM Antenna combiner (when is it necessary?)
« Reply #9 on: December 13, 2015, 12:50:30 PM »


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