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Author Topic: Extending range of Sennheiser EW100 radio mic  (Read 1062 times)

Don Boomer

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Re: Extending range of Sennheiser EW100 radio mic
« Reply #30 on: February 11, 2020, 03:05:24 pm »

You say it raises the noise floor, but there is "no floor" in this scan.

There is never zero noise floor.
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Don Boomer
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Jason Glass

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Re: Extending range of Sennheiser EW100 radio mic
« Reply #31 on: February 11, 2020, 03:10:54 pm »

There is never zero noise floor.

Truth and wisdom right there, folks.  Whenever you see a theoretical absolute minimum or maximum in ANY measurement, distrust the measurement until you've replicated it with numerous instruments, setups, and operators.  This is true in all disciplines of science and technology.

There are few flat lines in all of nature.  You need to understand that when you see one, it is an approximation either by human design (for various good reasons) or by accident.
« Last Edit: February 11, 2020, 03:19:34 pm by Jason Glass »
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Henry Cohen

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Re: Extending range of Sennheiser EW100 radio mic
« Reply #32 on: February 11, 2020, 03:28:08 pm »

There are few flat lines in all of nature.

And one of those usually entails a person standing by with defibrillation paddles . . .
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Henry Cohen

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Miguel Dahl

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Re: Extending range of Sennheiser EW100 radio mic
« Reply #33 on: February 11, 2020, 03:29:10 pm »

Truth and wisdom right there, folks.  Whenever you see a theoretical absolute minimum or maximum in ANY measurement, distrust the measurement until you've replicated it with numerous instruments, setups, and operators.  This is true in all disciplines of science and technology.

There are few flat lines in all of nature.  You need to understand that when you see one, it is an approximation either by human design (for various good reasons) or an accident.

*Sorry quoted the wrong post. Removed.
« Last Edit: February 11, 2020, 03:37:33 pm by Miguel Dahl »
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Ike Zimbel

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Re: Extending range of Sennheiser EW100 radio mic
« Reply #34 on: February 11, 2020, 03:29:20 pm »

And one of those usually entails a person standing by with defibrillation paddles . . .
Clear!!!
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Henry Cohen

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Re: Extending range of Sennheiser EW100 radio mic
« Reply #35 on: February 11, 2020, 03:43:03 pm »

My tool for the scans are the the antennas connected to the system I use.

This is good practice.

Quote
If they say It's at least a very low noise floor, or "none" where I'll target my frequencies, then that's what i'm getting through that system? I bet there is noise, but why compare noise from a theoretical system A, which I will not use, to noise from system B, which I will use and works at spec, which is the reference for the system I'm setting up? There is noise present, but if it seems good in in a manufacturers view, and I'm using that. And if it works flawlessly, then why bother with "there is never zero noise floor"?

Because, whereas the ultimate goal is to have the maximum and most reliable CNR possible, one needs more than a KUR* (Known to Unknown Ratio) of the environment; one should have quantitative values for the systems used and the environment in which one is operating. Without knowing the actual noise floor, it's impossible to determine CNR and thus stability of the RF system over a longer period of time.
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Henry Cohen

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Miguel Dahl

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Re: Extending range of Sennheiser EW100 radio mic
« Reply #36 on: February 12, 2020, 10:19:59 am »

This is good practice.

Because, whereas the ultimate goal is to have the maximum and most reliable CNR possible, one needs more than a KUR* (Known to Unknown Ratio) of the environment; one should have quantitative values for the systems used and the environment in which one is operating. Without knowing the actual noise floor, it's impossible to determine CNR and thus stability of the RF system over a longer period of time.

Righty-O. Thanks again!

I forgot to post a new picture with the actual dBm values for the scan I posted earlier, so here it is, fwiw at this point.

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ProSoundWeb Community

Re: Extending range of Sennheiser EW100 radio mic
« Reply #36 on: February 12, 2020, 10:19:59 am »


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