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Author Topic: IEM Antenna Question  (Read 869 times)

Jason Glass

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Re: IEM Antenna Question
« Reply #10 on: January 21, 2020, 04:55:40 pm »

I wasn't sure if the AC41 could somehow power the 5th transmitter through the splitter since the AC41 is able to power the other 4. I guess not then.

Thanks

Aah, understood.  That would exceed the total power draw specs for the AC41 DC supply, and combiners typically only output DC on their RF input ports.  Generally, RX antenna splitters do the opposite.

brian maddox

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Re: IEM Antenna Question
« Reply #11 on: January 21, 2020, 05:07:31 pm »

Physics dictates that any 2-way passive combiner attenuates output power by -3 dB plus insertion loss.  This comes out to about -3.5 dB for good quality 2-way combiners.  It also means that they reduce your output power by more than 50%.  If you're working large areas or trying to function in a high RF noise environment, the reduction in system reliability is huge.
...

This was what i was thinking, especially with the Sennies since they are 30mW transmitters IIRC.
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brian maddox
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Jason Glass

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Re: IEM Antenna Question
« Reply #12 on: January 21, 2020, 05:44:03 pm »

This was what i was thinking, especially with the Sennies since they are 30mW transmitters IIRC.

Morsel of info: Senny gifted the world by upping G4's output options to 10/30/50 mW.

Their engineering philosophy seems to embrace lower TX power paired with more sensitive RX than the competition's.  It appears that they achieve comparable function by having very good RX tracking filtering.  Lower TX power inherently allows their cheapest combiners to have looser isolation and amplification specs while still generating tolerably low IMD products.  Their fine "German engineering" certainly lives up to its reputation and results in a large $ to performance ratio.

brian maddox

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Re: IEM Antenna Question
« Reply #13 on: January 21, 2020, 08:07:17 pm »

Morsel of info: Senny gifted the world by upping G4's output options to 10/30/50 mW.

Their engineering philosophy seems to embrace lower TX power paired with more sensitive RX than the competition's.  It appears that they achieve comparable function by having very good RX tracking filtering.  Lower TX power inherently allows their cheapest combiners to have looser isolation and amplification specs while still generating tolerably low IMD products.  Their fine "German engineering" certainly lives up to its reputation and results in a large $ to performance ratio.

Two Morsels in One.  Thanks!
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Don Boomer

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Re: IEM Antenna Question
« Reply #14 on: January 22, 2020, 01:20:59 pm »

Lower TX power inherently allows their cheapest combiners to have looser isolation and amplification specs while still generating tolerably low IMD products.

The lowest power that gives you satisfactory performance is the way to go (both IEMs and wireless mics). And if you switch to a helical antenna you are likely picking up 10dB from the antenna.
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Keith Broughton

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Re: IEM Antenna Question
« Reply #15 on: January 22, 2020, 03:58:06 pm »

The lowest power that gives you satisfactory performance is the way to go (both IEMs and wireless mics). And if you switch to a helical antenna you are likely picking up 10dB from the antenna.
A bit of info most users don't understand.
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Re: IEM Antenna Question
« Reply #15 on: January 22, 2020, 03:58:06 pm »


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