Today's Message Index:
----------------------
1. 01:38 AM - Ammeter and shunts (Tom Kelso)
2. 06:11 AM - Re: Avionics Back-Up Power (Dave Wilenius)
3. 06:42 AM - Re: Avionics Back-Up Power (Carlos Trigo)
4. 06:51 AM - Noise Filter for Strobe power and regulator? (Steve Stearns)
5. 07:03 AM - Wire availability? (Steve Stearns)
6. 11:08 AM - Vx Aviation Introduces New Cellphone Audio Product (Vernon Little)
7. 07:19 PM - Switch problem (Charles Brame)
8. 09:44 PM - Re: Switch problem (Robert L. Nuckolls, III)
9. 09:46 PM - Re: Noise Filter for Strobe power and regulator? (Robert L. Nuckolls, III)
10. 10:36 PM - Re: Switch problem (Vernon Little)
Message 1
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| Subject: | Ammeter and shunts |
Bob, I have a question regarding ammeters and shunts. I have some 15 amp dc meters
with internal shunt. I would like to be able to modify one to read 45 amps
(or 3 times origional) and one to read 225 (15 times)amps. I have access to
the internal shunt but do not know its value. It would be easy to snip the internal
shunt out leaving the meter wires intact. Is there a way to use external
shunts and include a resistor in the feed line to the meter to alter the scale?
I have access to 50 amp shunts and 200 amp shunts but have not seen 45 and
225 shunts. I could change the scale to 50 and 200. If you have already covered
this, please just include the link. Thanks, Tom
Message 2
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| Subject: | Avionics Back-Up Power |
Carlos,
You've probably thought of this but ... could you not move the 2nd battery
backwards into the tail? Too much W&B shift?
regards,
Dave
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Carlos
Trigo
Sent: August 29, 2008 12:17 PM
To: aeroelectric-list@matronics.com
Subject: RE: AeroElectric-List: Avionics Back-Up Power
> >
> >Since I had to put some weight in the tail of my RV-9A, I decided to
> >install a battery as back-up power to some avionics, the EFIS, the COMM
> >Radio and the Transponder.
> >
> >
> >My GRT EFIS has 2 power inputs, which are internally controlled (EFIS
uses
> >the electrons from the highest source), so this is easy to wire.
> >
> >However, the Radio (SL-30) and the Transponder (GTX-330) only have 1
power
> >input, therefore the question:
> >
> >
> > - How should I wire power, both from Main Battery and Back-Up
Battery,
> > to the COMM Radio and the Transponder?
>
> How big a battery is it? How many batteries does the airplane
> carry already . . . in other words do you already have an
> AUX battery?
>
> Bob . . .
I don't know exactly, because I still don't know the exact weight I need
for W & B, but I am planning for a battery around 10Ah
I do have 2 other batteries, Main and AUX, since my engine is an
electron-dependant Subaru.
Carlos
Message 3
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| Subject: | Avionics Back-Up Power |
Hi Dave
I did thought of that but
1 - my Aux Batt is also an Odissey PC625 which doesn=92t fit under
the tail
fairing, and if I decided to put it somewhere between the baggage area
and
the tail tip, I would not be able to service/replace it
2 ' I need the Aux battery to be an exclusive back-up to my
electron-dependant engine, in case of alternator death and Main Battery
is
out of electrons
I know that 3 batteries look really overkill, mainly to Total Weight
=85.
Thanks anyway
Carlos
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave
Wilenius
Sent: ter=E7a-feira, 2 de Setembro de 2008 14:09
Subject: RE: AeroElectric-List: Avionics Back-Up Power
Carlos,
You've probably thought of this but ... could you not move the 2nd
battery
backwards into the tail? Too much W&B shift?
regards,
Dave
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Carlos
Trigo
Sent: August 29, 2008 12:17 PM
Subject: RE: AeroElectric-List: Avionics Back-Up Power
> >
> >Since I had to put some weight in the tail of my RV-9A, I decided to
> >install a battery as back-up power to some avionics, the EFIS, the
COMM
> >Radio and the Transponder.
> >
> >
> >My GRT EFIS has 2 power inputs, which are internally controlled (EFIS
uses
> >the electrons from the highest source), so this is easy to wire.
> >
> >However, the Radio (SL-30) and the Transponder (GTX-330) only have 1
power
> >input, therefore the question:
> >
> >
> > - How should I wire power, both from Main Battery and Back-Up
Battery,
> > to the COMM Radio and the Transponder?
>
> How big a battery is it? How many batteries does the airplane
> carry already . . . in other words do you already have an
> AUX battery?
>
> Bob . . .
I don't know exactly, because I still don't know the exact weight I need
for
W & B, but I am planning for a battery around 10Ah
I do have 2 other batteries, Main and AUX, since my engine is an
electron-dependant Subaru.
Carlos
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.
matro
nics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 4
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| Subject: | Noise Filter for Strobe power and regulator? |
Bob and group,
Looks like Radio Shack has obsoleted both noise filters in Bob's related
article. Does anyone have a recommendation on either an appropriate
replacement noise filter or an appropriate choke (I've got appropriate
caps...) for use at a strobe power supply?
2nd noise question: I'm planning on moving my "Ford Style" regulator up
into the nose of the longeze and adding an OVP module (with associated
5A breaker). I'm assuming the regulator noise is field-current-loop
noise which implies it shouldn't change much (loop the same, position of
regulator is different). Is there other regulator based noise I should
worry about?
(Sorry about the big increase in emails but I'm in the final detailing
stage of a complete rewiring of the Longeze and getting ready to drop $s
on parts)
Steve Stearns
Boulder/Longmont, Colorado
CSA,EAA,IAC,AOPA,PE,ARRL,BARC (but ignorant none-the-less)
Restoring (since 1/07): N45FC O235 Longeze Cothern/Friling CF1 (~1000 Hrs)
Flying (since 9/86): N43732 A65 Taylorcraft BC12D
Message 5
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| Subject: | Wire availability? |
Bob and the Group,
I was hoping to find aircraft wire of the following types, please let me
know if you know where it's available (it may not exist...). I do have
less optimal substitutions for each if I can't find them.
8 & 10 gauge in both Red & Black
or both 8 & 10 gauge 2-wire (non-shielded) (better but I'm expecting to
have to use white singles at this point...)
20 gauge 2-wire (non-shielded)
20 gauge 3-wire (shielded)
22 gauge 2-wire (non-shielded)
24 gauge 8-wire (non-shielded)
Thanks in advance,
Steve Stearns
Boulder/Longmont, Colorado
CSA,EAA,IAC,AOPA,PE,ARRL,BARC (but ignorant none-the-less)
Restoring (since 1/07): N45FC O235 Longeze Cothern/Friling CF1 (~1000 Hrs)
Flying (since 9/86): N43732 A65 Taylorcraft BC12D
Message 6
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| Subject: | Vx Aviation Introduces New Cellphone Audio Product |
Here'a an announcement that I hope is of interest to Aeroelectric folks:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ASX-2B device adds Stereo Music, Cellphone and Musicphone Capabilities to
Aircraft Audio Systems.
VANCOUVER, BC---September 2, 2008---Vx Aviation announced the introduction
of the ASX-2B Stereo Music & Cellphone Adapter that adds stereo music,
cellphone and musicphone capability to any intercom or radio installation in
non-certified aircraft.
Based on the AMX-2A stereo headphone music amplifier that was announced in
June 2008, the AMX-2B works seamlessly with virtually all monophonic and
stereo intercoms, audio panels, radios and other aircraft audio devices. Hi
fidelity circuitry in the device boosts music and cellphone power to provide
the clarity and volume required for effective use in noisy aircraft
environments. Integrated microphone circuitry allows aviation headsets to
be used for cellphone conversations as well as listening to music and
radio/intercom communications.
.... More information available on my website.
vern_little@vx-aviation.com
www.vx-aviation.com
Thanks, Vern
Message 7
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Bob, et., al.,
My strobe lights blows its fuse. After replacing the 10A fuse, it
blew again when the Master Switch was turned on with the strobe power
off. The wire from the power bus to the switch checked okay. However,
the fast-on for the wire that goes to the strobe power pack was
charred. A continuity check of the switch shows a closed circuit
from the common terminal to the exterior switch mounting bolt and
knob, regardless of the switch position. So, I think I have isolated
the problem to the panel mounted strobe power switch being shorted
out internally.
Questions:
Do I have the right switch for the situation? The switch is a B&C 700
series, 1-3 On-On. Its on a 12 volt system. A single hot wire goes
from the power bus to the switch and from the switch to the power
pack. The power pack is locally grounded. All wires are 18 gauge.
Are these type switch failures common?
Any ideas of what could have caused the short?
Charlie Brame
RV-6A N11CB
San Antonio
Message 8
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| Subject: | Re: Switch problem |
At 09:17 PM 9/2/2008 -0500, you wrote:
>Bob, et., al.,
>
>My strobe lights blows its fuse. After replacing the 10A fuse, it blew
>again when the Master Switch was turned on with the strobe power off. The
>wire from the power bus to the switch checked okay. However, the fast-on
>for the wire that goes to the strobe power pack was charred. A continuity
>check of the switch shows a closed circuit from the common terminal to the
>exterior switch mounting bolt and knob, regardless of the switch
>position. So, I think I have isolated the problem to the panel mounted
>strobe power switch being shorted out internally.
>
> Questions:
>
>Do I have the right switch for the situation? The switch is a B&C 700
>series, 1-3 On-On. Its on a 12 volt system. A single hot wire goes from
>the power bus to the switch and from the switch to the power pack. The
>power pack is locally grounded. All wires are 18 gauge.
>
>Are these type switch failures common?
I didn't think so . . . but it seems you've duplicated
a failure mode effect that was discovered in a strobe
system about 2 years ago. See:
http://tinyurl.com/2a2qqp
>Any ideas of what could have caused the short?
The working hypothesis is discussed in the failure
analysis. It would be interesting to get a current
draw signature from your strobe system . . . and
to find out if its the same brand as the one
involved in the earlier incident.
These switches are rated for plenty of current to
carry the strobe system currents I'm familiar with
but there may be something curious afoot here. In
any case, consider replacing the Carling device
with something heavier . . . A Honeywell Microswitch
11TS95
http://sccatalog.honeywell.com/pdbdownload/images/11ts95.series.chart.1.pdf
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=480-3066-ND
Bob . . .
Message 9
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| Subject: | Re: Noise Filter for Strobe power and regulator? |
At 07:50 AM 9/2/2008 -0600, you wrote:
>
>Bob and group,
>
>Looks like Radio Shack has obsoleted both noise filters in Bob's related
>article. Does anyone have a recommendation on either an appropriate
>replacement noise filter or an appropriate choke (I've got appropriate
>caps...) for use at a strobe power supply?
Now does noise from the strobe manifest itself
in your system?
>2nd noise question: I'm planning on moving my "Ford Style" regulator up
>into the nose of the longeze and adding an OVP module (with associated 5A
>breaker). I'm assuming the regulator noise is field-current-loop noise
>which implies it shouldn't change much (loop the same, position of
>regulator is different). Is there other regulator based noise I should
>worry about?
No, these regulators have not proven to be
antagonists to other systems.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 10
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Bob. I've had a Carling B&C 1-3 switch sitting on my desk for a couple of
years that I pulled out of my Whelen strobe circuit with almost identical
failure symptoms. I pulled it apart and it looks virtually identical to the
failed switch shown in your article.
Is this a coincidence? Three switches failing in identical fashions in
identical applications... Sounds like an intrinsic application problem. I
have my suspicions about the Whelen strobe pack. Is there any indication of
what the strobe unit was for the other failed switches?
Thanks,
Vern Little
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: September 2, 2008 9:43 PM
Subject: Re: AeroElectric-List: Switch problem
--> <nuckolls.bob@cox.net>
At 09:17 PM 9/2/2008 -0500, you wrote:
>Bob, et., al.,
>
>My strobe lights blows its fuse. After replacing the 10A fuse, it blew
>again when the Master Switch was turned on with the strobe power off. The
>wire from the power bus to the switch checked okay. However, the fast-on
>for the wire that goes to the strobe power pack was charred. A continuity
>check of the switch shows a closed circuit from the common terminal to the
>exterior switch mounting bolt and knob, regardless of the switch
>position. So, I think I have isolated the problem to the panel mounted
>strobe power switch being shorted out internally.
>
> Questions:
>
>Do I have the right switch for the situation? The switch is a B&C 700
>series, 1-3 On-On. Its on a 12 volt system. A single hot wire goes from
>the power bus to the switch and from the switch to the power pack. The
>power pack is locally grounded. All wires are 18 gauge.
>
>Are these type switch failures common?
I didn't think so . . . but it seems you've duplicated
a failure mode effect that was discovered in a strobe
system about 2 years ago. See:
http://tinyurl.com/2a2qqp
>Any ideas of what could have caused the short?
The working hypothesis is discussed in the failure
analysis. It would be interesting to get a current
draw signature from your strobe system . . . and
to find out if its the same brand as the one
involved in the earlier incident.
These switches are rated for plenty of current to
carry the strobe system currents I'm familiar with
but there may be something curious afoot here. In
any case, consider replacing the Carling device
with something heavier . . . A Honeywell Microswitch
11TS95
http://sccatalog.honeywell.com/pdbdownload/images/11ts95.series.chart.1.pdf
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=480-3066-ND
Bob . . .
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