Today's Message Index:
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1. 07:18 AM - Re: one accessory affecting another ?????? (Robert L. Nuckolls, III)
2. 07:34 AM - Re: one accessory affecting another ?????? (kgmjeric)
3. 09:06 AM - Re: Re: one accessory affecting another ?????? (Robert L. Nuckolls, III)
4. 05:04 PM - Splicing a shielded cable (Jared Yates)
5. 05:25 PM - Re: Intercom Noise (darnpilot@aol.com)
6. 05:43 PM - Re: Re: Intercom Noise (Bruce Gray)
7. 05:48 PM - Re: Re: Intercom Noise (darnpilot@aol.com)
8. 09:15 PM - Dual Shunts with Dynon EMS (John Volkober)
Message 1
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Subject: | Re: one accessory affecting another ?????? |
At 10:30 PM 9/1/2010, you wrote:
is it common for an intercom to receive different power level based
on the radio being turned on or off? they share a common power wire.
RADIO turned OFF the intercom led is inbetween red and green and
defaulting to co pilot side only
RADIO turned ON the intercom led is bright green and functioning well
when i say turned on or off I mean that the knob on the radio is
turned to the off position or on position the power wire stays hot always
Your narration has the "smell" of a noise issue.
I'm not familiar with the 'red/green' thing on the
intercom and you don't say what kind of radio is
involved . . . but here's a WAG.
Many modern radios have inverters to supply special
power for operation of LCD and/or glow-discharge
displays. These are potential antagonists for noise.
Will they PROBABLY meet DO-160 requirements for how
much noise is pushed back onto the power line, the
intercom MIGHT be unusually susceptible. Try operating
the intercom from a separate 12v source, like a
test battery as described in the noise trouble shooting
section of The 'Connection.
If this makes the symptoms go away, consider adding
a line noise filter in the +14v supply to the intercom.
We have a filter you can try . . . if it doesn't do
the job, you can return it.
Bob . . .
Message 2
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Subject: | Re: one accessory affecting another ?????? |
I am not having the problem with the radio turned on and it pushing backfeeding
through the power line but that the intercom will only perform with the radio
turned ON
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311070#311070
Message 3
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Subject: | Re: one accessory affecting another ?????? |
At 09:32 AM 9/2/2010, you wrote:
>
>I am not having the problem with the radio turned on and it pushing
>backfeeding through the power line but that the intercom will only
>perform with the radio turned ON
Hmmm . . . blew that WAG out of the water. Still,
operating the intercom from a separate power
source like a battery would be an interesting
thing to do. If two boxes are 'talking' to each
other, you need to deduce the propagation pathway.
The experiment would confirm/deny the +14v power
leads as being part of that pathway.
Bob . . .
Message 4
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Subject: | Splicing a shielded cable |
The dynon instructions call for a 4-conductor shielded cable from the panel to
the remote compass. I'm planning to put the compass box in the wing, but would
like to have a connector at the wing root to facilitate wing removal. What is
the best type of connector to use in that case?
Message 5
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Subject: | Re: Intercom Noise |
Bob,
More data points:
I installed a portable intercom in my plane. Its plugged in the new Pilot
mic & phone jacks. With only the internal 9v battery powering the unit,
I still get the noise in my headsets, but it is tolerable. Intercom off
= no noise. When I power the portable intercom from ships power the no
ise is louder, but still tolerable...barely.
Any ideas now?
Jeff Darnall
Jacksonville, FL
904-234-8718
__i__
*-----o--o--(_)--o--o-----*
Message 6
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Subject: | Re: Intercom Noise |
I'd say it's time to look at your headsets.
Bruce
www.Glasair.org
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
darnpilot@aol.com
Sent: Thursday, September 02, 2010 8:17 PM
Subject: AeroElectric-List: Re: Intercom Noise
Bob,
More data points:
I installed a portable intercom in my plane. Its plugged in the new
Pilot mic & phone jacks. With only the internal 9v battery powering the
unit, I still get the noise in my headsets, but it is tolerable.
Intercom off = no noise. When I power the portable intercom from ships
power the noise is louder, but still tolerable...barely.
Any ideas now?
Jeff Darnall
Jacksonville, FL
904-234-8718
__i__
*-----o--o--(_)--o--o-----*
Message 7
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Subject: | Re: Intercom Noise |
Bruce. Why? Tell me more?
I've used several different type headsets and they all have the same issue
.
Jeff Darnall
Jacksonville, FL
904-234-8718
__i__
*-----o--o--(_)--o--o-----*
-----Original Message-----
From: Bruce Gray <bgray@glasair.org>
Sent: Thu, Sep 2, 2010 8:41 pm
Subject: RE: AeroElectric-List: Re: Intercom Noise
I=99d say it=99s time to look at your headsets.
Bruce
www.Glasair.org
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelect
ric-list-server@matronics.com] On Behalf Of darnpilot@aol.com
Sent: Thursday, September 02, 2010 8:17 PM
Subject: AeroElectric-List: Re: Intercom Noise
Bob,
More data points:
I installed a portable intercom in my plane. Its plugged in the new Pilot
mic & phone jacks. With only the internal 9v battery powering the unit,
I still get the noise in my headsets, but it is tolerable. Intercom off
= no noise. When I power the portable intercom from ships power the no
ise is louder, but still tolerable...barely.
Any ideas now?
Jeff Darnall
Jacksonville, FL
904-234-8718
__i__
*-----o--o--(_)--o--o-----*
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Message 8
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Subject: | Dual Shunts with Dynon EMS |
I have an SD-8 auxiliary alternator. I am using the Z-13 wiring scheme
which has shunts for the primary and auxiliary alternator. I will be
using
a Dynon EMS. The Dynon has a single input for ammeter. I want to
access
the both shunts in the Z-13 wiring scheme. My initial design was to use
a
DPDT relay connected to the auxiliary alternator switch. With the
switch in
the off position, the primary alternator shunt would be connected to the
EMS. With the switch in the on position the relay would disconnect the
primary and connect the auxiliary alternator shunt.
Question: Is a simpler alternative to hook both shunts to the single EMS
input? And if I did this, would the reading be the sum of the two, if
both
alternators were active at the same time?
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