Today's Message Index:
----------------------
1. 12:06 AM - Re: Re: Shunts (Ernest Christley)
2. 03:04 AM - Re: Music Inputs (Martin Pohl)
3. 03:12 AM - Re: Music Inputs (Martin Pohl)
4. 04:35 AM - Re: Music Inputs (Dustin Paulson)
5. 06:19 AM - Re: AeroElectric-List Digest: 8 Msgs - 04/12/08 ()
6. 07:31 AM - Re: Re: Shunts (Robert L. Nuckolls, III)
7. 08:36 AM - 90-Degree Adapter for Avionics Cooling Fan Hose (Don Curry)
8. 09:04 AM - Re: 90-Degree Adapter for Avionics Cooling Fan Hose (Ron Quillin)
9. 09:20 AM - Re: Shunts (broken link fixed) (Robert L. Nuckolls, III)
10. 10:56 AM - Terra 250 transponder for sale (Palvary)
11. 01:56 PM - Re:Re: Music Inputs (Emrath)
12. 04:12 PM - Re: 90-Degree Adapter for Avionics Cooling Fan Hose (Sam Hoskins)
13. 05:15 PM - Misc. Electrical Questions (Henry Trzeciakowski)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
gmcjetpilot@yahoo.com wrote:
> The AMP meter is really a VOLT METER. Yep it has nothing to do with AMPS. (There
is an AMP and VOLT relation).
>
>
Aahh! But is it? Maybe the VOLT meter is really an AMP METER!!
If using a swinging arm type meter, the voltage across the inputs drives
a current that energizes an electromagnet, the forces the deflection.
You're using current to measure a voltage, that's caused by the current
across the shunt, which is caused by a voltage.
Aahiiieee!!
8*)
--
http://www.ronpaultimeline.com
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Music Inputs |
Earl, thank you for the great link. I was looking for exactly such a device. Do
you know if there is any amplifier around with an additional volume control knob?
Martin
--------
Martin Pohl
Zodiac XL QBK
8645 Jona, Switzerland
www.pohltec.ch/ZodiacXL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=176515#176515
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Music Inputs |
Just found this: http://www.minidisc.org/headbanger.html
Will try to get it running with my Harman Kardon Drive Play iPod Controller, Flightcom
Intercom 403stereo and Lightspeed 3G headphones.
Martin
--------
Martin Pohl
Zodiac XL QBK
8645 Jona, Switzerland
www.pohltec.ch/ZodiacXL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=176516#176516
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Music Inputs |
Dave,
I just had this same question, after a recent discussion by Vern Little
about the AMX-2 Audio Mixer Amplifier, and Vern was nice enough to send
me the following information when I inquired about using the AMX-2 to
solve this issue..
Apparently Garmin added a pre-amp for the music inputs on the 340 to
help solve just the problem you describe, and that I also have.
They came up with a modification called Mod 2 first, in which you place
in pin in the #15 position of the J-2 plug on the back of the GMA 340,
and connect it directly to ground to activate this pre-amp.
Apparently sometime later they came out with the Mod 5, which allows you
to install a wire and pin in the same #15 position, and connect it to a
switch that is connected to ground so that you can have the pre-amp
either off or on depending on whether what you have plugged into the
music input needs further amplification or not. This switched ground
also apparently helped eliminate the amplification of other "noises" in
the system, by being able to turn it off when the pre-amp wasn't needed
for the music input. The Garmin notes state this switch can only be
installed in units with Mod 5.
So, you will need to find out if you have either of those Mods. Vern
said that it was probably listed on a tag on the unit, but I was able to
find it on some paper work that had come back with the unit after some
factory repair work had been done, that showed my unit had the Mod 5
installed. Now I need to find a reasonable source for a high density pin
crimper.
I have Steins 4-way indent crimper for the standard density pins, but
not the high density.
I need a 15 pin high density connector for another Mod I need to make to
get my 430W to talk nice to my GRT EFIS through my Approach Avionics
Hub.
Stein has the HD pins, but not the 15 pin HD connectors I need.
So if anyone has a good ( read cheap ) source for the high density pins,
15 pin HD connectors, and tools, I'd like to hear about them.
If not, Approach will do the mods I need for a price that may be less
than investing in the tools, but it would be nice to have the tools for
future needs too.
Thanks
Dustin Paulson
I had a music jack wired into my system. My audio panel is a Garmin 340.
I
have a sonyericcson mobile phone with walkman capability. What I
find is
that with the walkman at max volume output the sound through the
headphones
is reasonable, engine off on the ground. However with the engine
running at
cruise I can barely hear the music. Are there settings on the
system I
should check ??
Dave Emond
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: AeroElectric-List Digest: 8 Msgs - 04/12/08 |
Dave Garmin has a AUDIO GAIN adjustment you can control. Good news. Not sure if
you model has that gain or volume, but do know some Garmin audio panels do.
ANY WAY Garmin (some models) are adjustable. Some req you go into a menu.
Other intercoms that don't have adjustment can benefit from a headphone amp or
small preamp to feed the intercom. iPods and CD players have small amps that
are made to drive small headphones or earbuds. They tend to be a little under
powered to drive some intercoms. Also the output from portable music devices
is 16-32 ohm impedance. The input impedance to most intercoms is 600 ohms. The
mis match does not help either.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
From: "Emond" <d_emond@mweb.co.za>
Subject: AeroElectric-List: Re: Music Inputs
I had a music jack wired into my system. My audio panel is a Garmin
340. I
have a sonyericcson mobile phone with walkman capability. What I find
is
that with the walkman at max volume output the sound through the
headphones
is reasonable, engine off on the ground. However with the engine
running at
cruise I can barely hear the music. Are there settings on the system I
should check ??
Dave Emond
__________________________________________________
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
At 03:05 AM 4/13/2008 -0400, you wrote:
><echristley@nc.rr.com>
>
>gmcjetpilot@yahoo.com wrote:
>>The AMP meter is really a VOLT METER. Yep it has nothing to do with AMPS.
>>(There is an AMP and VOLT relation).
>>
>>
>
>Aahh! But is it? Maybe the VOLT meter is really an AMP METER!!
>If using a swinging arm type meter, the voltage across the inputs drives a
>current that energizes an electromagnet, the forces the deflection.
>You're using current to measure a voltage, that's caused by the current
>across the shunt, which is caused by a voltage.
>
>Aahiiieee!!
A very astute observation sir. Allowing a coil
of wire to move within the field of a permanent magnet
was the brainchild of a fine fellow named D'arsonval
who conceived the design about 130 years ago. There's
an excellent description of the details of this idea
offered over several pages beginning at:
http://www.tpub.com/neets/book3/7.htm
Hit the "-> next" buttons to access the series.
One may also craft a moving magnet instrument . . .
a good example is Van's ammeter. Unlike the more
fragile and difficult to calibrate moving coil
movement typical of:
http://www.aeroelectric.com/Pictures/Instruments/Loadmeter_2.jpg
Vans ammter shown at:
http://www.aeroelectric.com/Pictures/Instruments/VAM10_Interior_View
moves a barrel shaped magnet in the center of TWO coils
positioned at right angles to each other. This movement
doesn't need springs and is NOT calibrated with respect
to current flowing in the coils. In this case
two coils are excited with a current proportional
to the sine and cosine of the applied stimulus. The magnet
and pointer are often free to rotate 360 degrees. Van's
instrument is "pegged" at -45 amps and has a light spring
that drives the pointer to the peg when the instrument is
powered down. But you could remove the peg and spring.
The pointer would rotate freely and still properly indicate
the mechanical result of the ratio of two currents applied
to the coils. This style of meter movement can be used to
drive something like a compass card for displaying a
heading not unlike that offered by the DG.
This instrument is interesting because it can be
electronically conditioned to display a host of stimuli
and it takes advantage of the full rotational scale
of the instrument. D'arsonval movements get VERY
hard to build beyond 90 to 110 degrees of pointer
swing.
Because they deal with the results of a magnetic
interaction between coil(s) of wire and fixed magnets
both instruments are indeed displays of the effects
of CURRENT.
However, if one considers the internal resistance of
the instrument as being part of the overall circuit,
the raw device can be used to display the effects
of very small voltages. A good example is the classic,
non-amplified CHT instrument. An example is shown
here:
http://www.aeroelectric.com/Pictures/Instruments/CHT%20Gauge.jpg
This puppy reads full scale when something on the order
of 7 MILLIVOLTS is applied to its terminals. This is
the voltage generated by K-type thermocouple wire
at 350F. In this case, the moving coil can be crafted
of few turns of relatively large wire (low resistance)
because while a thermocouple doesn't offer much VOLTAGE,
it is a very low impedance source of energy and can
produce considerable CURRENT at the relatively small
voltage.
All moving coil devices are dependent upon the force
against a spring which is proportional to the current
flowing in a coil of wire. Of course the coil has resistance
of its own so any basic meter movement calibrated for
the measurement of a current may also be said to be
a "voltmeter" . . . typically, rudimentary movements will
indicate full scale with voltages on the order of 10
to 200 millivolts. The instruments designed to work in
conjunction with shunts are generally crafted so that
the CURRENT induced in the coil produces full scale
torque when 50 milliVOLTS (standard shunt calibration)
is applied to the terminals.
Van's instrument is fitted with electronics such that
the stuff sensed at the input terminals is indeed
a voltage . . . the considerable current required
to position the pointer comes from the electronics
power supply and not from the voltage stimuli being
monitored.
I've done some preliminary testing on the Van's
ammeter . . . by modern aviation design goals it
is exceedingly sensitive to local RF fields. I'm
working on an article to explore this condition.
I'll also see if I can craft an easily fabricated
filter or shield as a workaround for this product's
shortcomings.
Bob . . .
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | 90-Degree Adapter for Avionics Cooling Fan Hose |
Does anybody know where to get a 90-degree elbow adapter to fit on the
cooling fan port on the backplate of a KX-165? I'm using Cyclone hose and
it is too stiff to make the bend (or kinks) in the space available. I've
checked all the usual places (Spruce, Chief, etc) and can't find anything.
Thanks, Don
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 90-Degree Adapter for Avionics Cooling Fan Hose |
At 08:27 4/13/2008, you wrote:
>Does anybody know where to get a 90-degree elbow adapter to fit on the
>cooling fan port on the backplate of a KX-165? I'm using Cyclone hose and
>it is too stiff to make the bend (or kinks) in the space available. I've
>checked all the usual places (Spruce, Chief, etc) and can't find anything.
>Thanks, Don
Don't know if it's applicable for you, but I used a 5/8" copper pipe
ELL on the back of a KNS-80.
Ron Q.
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Shunts (broken link fixed) |
<nuckolls.bob@cox.net>
At 03:05 AM 4/13/2008 -0400, you wrote:
><echristley@nc.rr.com>
>
>gmcjetpilot@yahoo.com wrote:
>>The AMP meter is really a VOLT METER. Yep it has nothing to do with AMPS.
>>(There is an AMP and VOLT relation).
>>
>
>Aahh! But is it? Maybe the VOLT meter is really an AMP METER!!
>If using a swinging arm type meter, the voltage across the inputs drives a
>current that energizes an electromagnet, the forces the deflection.
>You're using current to measure a voltage, that's caused by the current
>across the shunt, which is caused by a voltage.
>
>Aahiiieee!!
A very astute observation sir. Allowing a coil
of wire to move within the field of a permanent magnet
was the brainchild of a fine fellow named D'arsonval
who conceived the design about 130 years ago. There's
an excellent description of the details of this idea
offered over several pages beginning at:
http://www.tpub.com/neets/book3/7.htm
Hit the "-> next" buttons to access the series.
One may also craft a moving magnet instrument . . .
a good example is Van's ammeter. Unlike the more
fragile and difficult to calibrate moving coil
movement typical of:
http://www.aeroelectric.com/Pictures/Instruments/Loadmeter_2.jpg
Vans ammter shown at:
http://www.aeroelectric.com/Pictures/Instruments/VAM40_Interior_View.jpg
moves a barrel shaped magnet in the center of TWO coils
positioned at right angles to each other. This movement
doesn't need springs and is NOT calibrated with respect
to current flowing in the coils. In this case
two coils are excited with a current proportional
to the sine and cosine of the applied stimulus. The magnet
and pointer are often free to rotate 360 degrees. Van's
instrument is "pegged" at -45 amps and has a light spring
that drives the pointer to the peg when the instrument is
powered down. But you could remove the peg and spring.
The pointer would rotate freely and still properly indicate
the mechanical result of the ratio of two currents applied
to the coils. This style of meter movement can be used to
drive something like a compass card for displaying a
heading not unlike that offered by the DG.
This instrument is interesting because it can be
electronically conditioned to display a host of stimuli
and it takes advantage of the full rotational scale
of the instrument. D'arsonval movements get VERY
hard to build beyond 90 to 110 degrees of pointer
swing.
Because they deal with the results of a magnetic
interaction between coil(s) of wire and fixed magnets
both instruments are indeed displays of the effects
of CURRENT.
However, if one considers the internal resistance of
the instrument as being part of the overall circuit,
the raw device can be used to display the effects
of very small voltages. A good example is the classic,
non-amplified CHT instrument. An example is shown
here:
http://www.aeroelectric.com/Pictures/Instruments/CHT%20Gauge.jpg
This puppy reads full scale when something on the order
of 7 MILLIVOLTS is applied to its terminals. This is
the voltage generated by K-type thermocouple wire
at 350F. In this case, the moving coil can be crafted
of few turns of relatively large wire (low resistance)
because while a thermocouple doesn't offer much VOLTAGE,
it is a very low impedance source of energy and can
produce considerable CURRENT at the relatively small
voltage.
All moving coil devices are dependent upon the force
against a spring which is proportional to the current
flowing in a coil of wire. Of course the coil has resistance
of its own so any basic meter movement calibrated for
the measurement of a current may also be said to be
a "voltmeter" . . . typically, rudimentary movements will
indicate full scale with voltages on the order of 10
to 200 millivolts. The instruments designed to work in
conjunction with shunts are generally crafted so that
the CURRENT induced in the coil produces full scale
torque when 50 milliVOLTS (standard shunt calibration)
is applied to the terminals.
Van's instrument is fitted with electronics such that
the stuff sensed at the input terminals is indeed
a voltage . . . the considerable current required
to position the pointer comes from the electronics
power supply and not from the voltage stimuli being
monitored.
I've done some preliminary testing on the Van's
ammeter . . . by modern aviation design goals it
is exceedingly sensitive to local RF fields. I'm
working on an article to explore this condition.
I'll also see if I can craft an easily fabricated
filter or shield as a workaround for this product's
shortcomings.
Bob . . .
--
incoming mail is certified Virus Free.
Checked by AVG.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Terra 250 transponder for sale |
Excellent condition transponder with tray and FAA req'd Mod 5 AD done.
I purchased this transponder a year ago from Ebay. The project fell
through so I never installed it nor tested it, but was sold to me "in
perfect working condition". The unit has an "Authorization for Return
to Service" tag from Terra Corporation dated May 22,1995. I payed a
lot for this unit ($670) because it is one of the few of the type that
is
legal to use because it had the Mod 5 AD done. The great benefit of
these TRT250 units is that they are very compact and lightweight, like
the Microair or Becker units. Perfect for the cramped panel of a VFR
Long or Vari.
--Jose
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Music Inputs |
Check your installation. There is a "high music gain" feature that required
a grounding of Pin J2-15 and provide a lot of gain. I'm still building so
I haven't run the engine yet, but this greatly improved my volume. Also, I
have a ANC David Clark and for some reason turning on the ANC really
improved the sound quality and gave a boost to the low end!
Good Luck.
Marty
Time: 05:05:59 AM PST US
From: "Emond" <d_emond@mweb.co.za>
Subject: AeroElectric-List: Re: Music Inputs
I had a music jack wired into my system. My audio panel is a Garmin 340. I
have a sonyericcson mobile phone with walkman capability. What I find is
that with the walkman at max volume output the sound through the headphones
is reasonable, engine off on the ground. However with the engine running at
cruise I can barely hear the music. Are there settings on the system I
should check ??
Dave Emond
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: 90-Degree Adapter for Avionics Cooling Fan Hose |
I used the cooling blast hose, from Vans, to cool my mags. It's cheap and
easy to form.
See it here: *http://tinyurl.com/4mbget
Sam Hoskins
Quickie Q-200
*
On Sun, Apr 13, 2008 at 10:27 AM, Don Curry <currydon@bellsouth.net> wrote:
> currydon@bellsouth.net>
>
>
> Does anybody know where to get a 90-degree elbow adapter to fit on the
> cooling fan port on the backplate of a KX-165? I'm using Cyclone hose and
> it is too stiff to make the bend (or kinks) in the space available. I've
> checked all the usual places (Spruce, Chief, etc) and can't find anything.
> Thanks, Don
>
>
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Misc. Electrical Questions |
Bob:
I'm just about ready to begin my wiring in my 9A and I have a couple of
questions:
1) My load analysis is as follows: day VFR Cruise - Main Bus - 15.9
Edurance Bus - 8.65 Battery Bus - 1.0 for a total of 24.8 amps.....my
question is : should I use the drawing for "HEAVY ENDURANCE BUS", since
I'm going to draw over 7 amps and utilize the S704-1 relay and 10 amp
fuse for the battery bus?
2) I do plan on using an Avionics Master switch - I do know your
thoughts regarding not needing it, but ....... my questions is: the
Z-drawings depict 16 awg (6-8" run) from Main Bus to Diode and 16 awg
(6-8" run) from Diode to Endurance Bus - since I'm going to install the
AMS on the instrument panel, the run from the Diode to the panel will be
about 14-18"......what do you suggest for the size of wire and what is
the max lenght it should be.
3) Can I install the LR-3 Regulator and Battery Bus on the engine
side of the firewall....It seems to make sense for I wouldn't have to
run un-fused wires thru the firewall...
4) Can I run 14 awg wire to the Battery Bus from the + terminal of
the battery, instead of from the Master Battery Contactor? and
can I run 8 awg wire power supply to the Main Bus from the 60 amp
current limiter?
Thanks
Henry
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|