Today's Message Index:
----------------------
1. 06:37 AM - newbie (michael harris)
2. 06:49 AM - Re: Ground Power and Aux Alt sharing OVM? (Robert L. Nuckolls, III)
3. 07:07 AM - Re: newbie (Robert L. Nuckolls, III)
4. 07:07 AM - Re: AEC-9011 (Robert L. Nuckolls, III)
5. 10:01 AM - Headset and mic shield question (rparigoris)
6. 11:09 AM - Re: Headset and mic shield question (Robert L. Nuckolls, III)
7. 12:12 PM - Re: AEC-9011 (Robert Dufresne)
8. 12:41 PM - Re: AEC-9011 (Robert L. Nuckolls, III)
9. 01:07 PM - Microphone levels (B Tomm)
10. 01:22 PM - Re: Headset and mic shield question (rparigoris)
11. 03:30 PM - Re: Microphone levels (Robert L. Nuckolls, III)
12. 09:25 PM - stray RF (James Robinson)
13. 09:46 PM - Re: Microphone levels (B Tomm)
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| Subject: | Microphone levels |
Bob,
Would you expect that the microphone output level from a standard Aviation
headset to be similar/ or even the same as a standard handheld audio
microphone as used with a professional sound board? I don't own an audio
meter but just need to be close for a non-aircraft related project.
Bevan
Rv7A Implementing Z13/8
Message 10
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| Subject: | Re: Headset and mic shield question |
Hi Bob
I have a PS Engineering PMA 4000.
See:
Page #21:
http://www.ps-engineering.com/docs/PMA4000_IM.pdf
Each 2 or 3 conductor cable has the shield connected to a different pin on the
25 pinb P1 Bottom Unit Connector.
If pin 1, 2 , 6 and 7 were to touch each other at my D-sub connector, what trouble
(if any) might that cause?
Thx.
Ron Parigoris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=303825#303825
Message 11
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| Subject: | Re: Microphone levels |
At 03:04 PM 7/5/2010, you wrote:
>
> Bob,
>
>Would you expect that the microphone output level from a standard Aviation
>headset to be similar/ or even the same as a standard handheld audio
>microphone as used with a professional sound board?
No. Aircraft microphones are victim to legacy compatibility
standards that emulate the original carbon granule microphones
(like those in telephones through the 70s).
http://en.wikipedia.org/wiki/Carbon_microphone
The audio output is not only very high (as much as 1 vrms) it is
generated with a power supply delivered by the transmitter.
Hence, most aircraft microphones have active electronics so
that modern TINY voltage microphones can dress up like
a carbon mic.
> I don't own an audio
>meter but just need to be close for a non-aircraft related project.
Sound boards are generally set up to accept 100 mV pk-pk
(30 mV rms) output from dynamic mics delivered on twisted pairs.
Bob . . .
Message 12
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Hi Bob
I have recently developed a problem when I transmit my VSI and other features on
my Cheltons goes crazy. I have added a engine monitor EI MVP-50 recently. Is
there a way to isolate the cause. This is a recent occurance No prior problem
for 350 hrs
James Robinson
Glasair lll N79R
Spanish Fork UT U77
________________________________
Message 13
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| Subject: | Microphone levels |
Thanks Bob, exactly what I'm looking for.
Bevan
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Monday, July 05, 2010 3:26 PM
Subject: Re: AeroElectric-List: Microphone levels
--> <nuckolls.bob@aeroelectric.com>
At 03:04 PM 7/5/2010, you wrote:
>--> <fvalarm@rapidnet.net>
>
> Bob,
>
>Would you expect that the microphone output level from a standard
>Aviation headset to be similar/ or even the same as a standard handheld
>audio microphone as used with a professional sound board?
No. Aircraft microphones are victim to legacy compatibility
standards that emulate the original carbon granule microphones
(like those in telephones through the 70s).
http://en.wikipedia.org/wiki/Carbon_microphone
The audio output is not only very high (as much as 1 vrms) it is
generated with a power supply delivered by the transmitter.
Hence, most aircraft microphones have active electronics so
that modern TINY voltage microphones can dress up like
a carbon mic.
> I don't own an audio
>meter but just need to be close for a non-aircraft related project.
Sound boards are generally set up to accept 100 mV pk-pk
(30 mV rms) output from dynamic mics delivered on twisted pairs.
Bob . . .
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