What's the difference between a dynamic and electret mike?
Brett Wayne
I've been looking on purchasing a new headset for use in my Pitts that
will reduce the amount of noise picked up by the microphone when I
broadcast on the radio. I'm currently using a Pilot Avionics PA11-40
with an electret mike. Would a headset with a dynamic microphone help
reduce the amount of noise picked up?
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Andy Silverman
The only difference is that a dynamic mike generates all of its own
current and an electret mike requires a small charge from an external
source to power it. Electret mikes are typically higher quality and more
sensitive. Neither one will substantially reduce noise over the other
type.
The key is to find a mic that has two elements, one pointing AWAY from
you, such as the mic used in the David Clark 13.4 model. The two are
wired up in inverse phase with each other, and so what actually gets
transmitted is noise that's on one side but not on the other. This
typically means your voice gets transmitted loud and clear but
omnidirectional ambient noise is cut down a lot. Cellular phones
typically use the same technology.
--
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Andy Silverman
N8319W, 1965 Piper Cherokee 180C
My opinions are mine and not Microsoft's.
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> b...@ccnet.com (Brett Wayne) wrote in article
<bmw-2905...@h98-155.ccnet.com>...
Gary T. Craze
Brett Wayne wrote:
>
> I've been looking on purchasing a new headset for use in my Pitts that
> will reduce the amount of noise picked up by the microphone when I
> broadcast on the radio. I'm currently using a Pilot Avionics PA11-40
> with an electret mike. Would a headset with a dynamic microphone help
> reduce the amount of noise picked up?
>
Well, as far as frequency response (voice range) and intelligibility of
the transmitted voice, both the Dynamic and Electret mics are excellent.
However, for noise cancellation (and shock resistance) the electret mic
is much better. The electret mics are much smaller and lighter
(although generally more expensive). They also provide better EMI
immunity, and are about equal with Dynamic mics for RFI immunitiy (VHF).
Overall, Dynamic mics have been known for their reliability, and
electret mics have been known for their overall better performance.
regards,
Gary
--
Gary T. Craze
Visit the HandHeld GPS and Moving Map InfoCenter at:
http://rampages.onramp.net/~gcraze/
Visit Compaq on the World Wide Web at:
http://www.compaq.com
Drop me an email at: gcr...@bangate.compaq.com
Compaq Computer Corp. Houston, TX
Technology Planning, Portable Division
|Comments are my own and do not reflect |
|those of Compaq Computer Corporation |
Joe Norris
>From: b...@ccnet.com (Brett Wayne)
>Subject: What's the difference between a dynamic and electret mike?
>Date: Wed, 29 May 1996 09:16:29 -0700
>I'm currently using a Pilot Avionics PA11-40
>with an electret mike. Would a headset with a dynamic microphone help
>reduce the amount of noise picked up?
I've always had better luck with the electret mike in high noise sitations.
Joe Norris
Central Wisconsin, USA
e-mail: jno...@tznet.com
Jerry Bransford
Brett Wayne wrote:
>
> I've been looking on purchasing a new headset for use in my Pitts that
> will reduce the amount of noise picked up by the microphone when I
> with an electret mike. Would a headset with a dynamic microphone help
> reduce the amount of noise picked up?
DEFINITELY don't go with the dynamic mike! The electret mike is a noise
canceling type microphone and is a much more modern design than the less
expensive and noisy/old technology dynamic. If your current electret
microphone doesn't have the foam 'pop' filter cover that also helps
eliminate noise (it may have fallen off), I suggest putting one on
for about $1.50 and securing it with a rubber 'o' ring so it doesn't
fall off.
--
Jerry Bransford
PP-ASEL, KC6TAY, C.A.P.
The Zen hotdog... make me one with everything!
brian whatcott
In article <01bb4d94.20711100$b9b3369d@andrewsi>, andr...@microsoft.com
says...
>
>The only difference is that a dynamic mike generates all of its own
>current and an electret mike requires a small charge from an external
>source to power it.
An electret has its own source for the electric field, a condenser mike
doesn't.
Brian