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Author Topic: Shure ULX battery draw  (Read 3790 times)

Justin Goodman

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Re: Shure ULX battery draw
« Reply #10 on: October 24, 2018, 09:56:45 am »

^^^^^^^^^

You are correct. The more sound it transmits the faster it draws the battery.

Can somebody explain how this works?  I'm not doubting that it's correct, just curious why it's the case.  My understanding of FM modulation is that output amplitude should be pretty constant (vs AM).  I can see the "work" of modulating the frequency with "content" potentially requiring some power, maybe?  But it doesn't seem like it would be tremendously different?
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Rob Spence

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Re: Shure ULX battery draw
« Reply #11 on: October 24, 2018, 01:34:08 pm »

I switched to L-Ion 9V a few years ago because they have MORE capacity than an alkaline.  I'm still using the first set i bought.  They're at least 5 years old at this point.  They've never let me down.

Any particular brand?

Charger?



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Andrew Broughton

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Re: Shure ULX battery draw
« Reply #12 on: October 24, 2018, 01:54:41 pm »

I switched to L-Ion 9V a few years ago because they have MORE capacity than an alkaline.  I'm still using the first set i bought.  They're at least 5 years old at this point.  They've never let me down.
The other thing people don't realize about rechargeables is that they can be MORE reliable than Alkalines. If you've used that particular rechargeable battery before, you already know how long it will last when fully charged. An alkaline can be DOA out of the box, or have lower capacity than expected because IT's THE FIRST TIME YOU'VE EVER USED IT. It has no history or track record. You're just gambling that it will work.
There are no real advantages to non-rechargables except convenience. For professional, critical situations, KNOWN rechargeables are the right way to go.
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Jason Glass

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Re: Shure ULX battery draw
« Reply #13 on: October 24, 2018, 04:26:31 pm »

Can somebody explain how this works?  I'm not doubting that it's correct, just curious why it's the case.  My understanding of FM modulation is that output amplitude should be pretty constant (vs AM).  I can see the "work" of modulating the frequency with "content" potentially requiring some power, maybe?  But it doesn't seem like it would be tremendously different?
A wireless microphone transmitter carries a whole lot more circuitry than just the radio portion.  How that circuitry handles the audio portion is crucial in how rapidly the electrical current is consumed.

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Luke Geis

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Re: Shure ULX battery draw
« Reply #14 on: October 28, 2018, 02:22:02 pm »

There is a companding circuit in the microphone among several other monitoring circuits. It is sending all kinds of data to the receiver. The pilot tone, the audio signal, battery usage info etc. When actual audio is passing through it has to modulate that data and transmit it. Even running in hi or low power mode is a factor in battery life. Simply, the more information that is transmitted the shorter the battery life.
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William Schnake

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Re: Shure ULX battery draw
« Reply #15 on: October 28, 2018, 03:36:24 pm »

Rob, I can't answer your questions directly however, we own several ULX/P with both handheld 58/Beta 58a and body packs.  We always use Duracell Pro-cell 9 volt batteries.  We consistently get 6 - 8 hours regardless of which mic system we are using.  We have only had two of the Duracell Pro-cells not work in the past 5 years or so.  We go through between 800 and 1,000 per year.

Bill
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Luke Geis

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Re: Shure ULX battery draw
« Reply #16 on: October 31, 2018, 06:47:13 pm »

I have come across several bad batches of Duracell Pro-Cell batteries. How or why is beyond me, but I have been let down by them more than a couple times over the years. I would say at least 3-4 times in the last 15 years.
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I don't understand how you can't hear yourself

ProSoundWeb Community

Re: Shure ULX battery draw
« Reply #16 on: October 31, 2018, 06:47:13 pm »


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