Today's Message Index:
----------------------
1. 04:11 AM - Re: alternator wiring (Kenneth Johnson)
2. 06:32 AM - Re: alternator wiring (Robert L. Nuckolls, III)
3. 06:49 AM - XM weather receiver? (Dawson-Townsend,Timothy)
4. 07:50 AM - APRS / ATRS (Paul Millner)
5. 07:59 AM - Re: Com and Nav Radio and Antenna Questions (Richard Girard)
6. 08:58 AM - Re: Cross talk problem (jonlaury)
7. 09:15 AM - Re: Com and Nav Radio and Antenna Questions (Robert L. Nuckolls, III)
8. 06:37 PM - DraftSight CAD WARNING (Richard Girard)
9. 08:49 PM - Re: APRS / ATRS (Don)
10. 09:35 PM - Re: APRS / ATRS (Daniel Hooper)
11. 09:41 PM - Re: Re: Cross talk problem (Daniel Hooper)
Message 1
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Subject: | Re: alternator wiring |
Bob,=0AThe EXP-Bus does provide some OV protection.- In reading informati
on about its use, recommendations suggested not to go above 40 amps.- I h
ave planned to install a 40 amp fusable link before the bus.- I also am i
nstalling both an amp meter and volt meter to monitor electrical flow.- I
know there are several alternatives.- What would you recommend?- Ken J
ohnson=0A=0A=0A=0A________________________________=0A From: "Robert L. Nuck
olls, III" <nuckolls.bob@aeroelectric.com>=0ATo: aeroelectric-list@matronic
s.com =0ASent: Sunday, February 5, 2012 1:45 PM=0ASubject: Re: AeroElectric
bert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>=0A=0AAt 12:23 PM 2/5
/2012, you wrote:=0A> Bob, thanks again for your help. I have an EXP-Bus th
at I am using and in which I can connect- for OV protection.- Does the
10 o'clock connection go to this bus?=0A=0A- - The data was not helpful
about the upper-left terminal . . .=0A- - given that it's an internall
y regulated alternator, I=0A- - haven't even got a good guess as to wha
t that terminal=0A- - is for.=0A=0A- - At 70A, it's certainly a rob
ust alternator. But without=0A- - adding a b-lead disconnect contactor,
this style=0A- - of alternator many not be controllable from outside
=0A- - during a runaway OV event. Suggest you consider modifying=0A-
- it for use with an external regulator, ov protection system=0A- - f
===========
Message 2
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Subject: | Re: alternator wiring |
At 06:06 AM 2/7/2012, you wrote:
>Bob,
>The EXP-Bus does provide some OV protection.
But is it compatible with internally regulated alternators?
> In reading information about its use, recommendations suggested
> not to go above 40 amps. I have planned to install a 40 amp
> fusable link before the bus.
Not necessary and probably wouldn't perform as
desired. The EXP bus was crafted for much simpler/
smaller systems. It brings FAT WIRE distribution onto
etched circuit board traces which are vulnerable to
failure under continuous loads. Adding a fusible
is not necessary . . . you just need to limit the
number of electro-whizzies to 40A or less when
everything is turned on.
> I also am installing both an amp meter and volt meter to monitor
> electrical flow. I know there are several alternatives. What
> would you recommend?
My personal choice would be to modify the alternator
for use with an external regulator. Check the
AeroElectric List archives for discussions on
internal failure modes that cannot be controlled
from outside the alternator except by gross
disconnection of the B-lead . . . which is difficult
at best.
An alternator that size will quickly push lots of energy
into your ship's electrical system. Legacy design goals
call for millisecond-fast response to such an event.
These design goals are satisfied by the use of external
regulation and ov protection like that depicted in
the 'Connection's z-figures -OR- modifications like those
crafted by Plane-Power.
Bob . . .
Message 3
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Subject: | XM weather receiver? |
Just throwing this out there . . .
I have a portable XM weather data receiver, the older "roundish" style that
has a USB output on it. I'd like to figure out two things:
1) Does someone know the meaning of the status LED? It's either red/green f
lashing or green steady.
2) Does anyone happen to know the pin-out for the J13 8-pin connector on th
e circuit board inside? I know that it is an RS-232 output that one can tap
into, but my old information I have is conflicting . . .
Thanks,
Tim
N52KS
RV-10
Message 4
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>> RV's with ATRS installed use the JPOLE
Are folks using ATRS (APRS?) for sending text messages also? Is there a
WiFi interface to smart phones, or what's the input device of choice?
Paul
Message 5
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Subject: | Re: Com and Nav Radio and Antenna Questions |
Bob, I have a question. How much performance degradation, TLAR estimate, is
there from placing a com antenna in a horizontal or near horizontal
position? Are not com radio signals vertically polarized? Doesn't mounting
them horizontally increase there directional selectivity, for lack of
knowing the proper term?
Rick Girard
On Mon, Feb 6, 2012 at 8:20 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> nuckolls.bob@aeroelectric.com**>
>
> At 07:20 PM 2/5/2012, you wrote:
>
> This will not break the bank, will purchase one. It does not mention the
> ability to excite the feedline and antenna for setting up vor so U will
> need help in doing that.
>
> This is a self contained antenna analyzer. It features
> a variable frequency oscillator that provides a test
> signal source over a 2 to 170 Mhz range. There is a
> counter that displays the oscillator's present frequency.
> Finally, there is an array of detectors upon which a
> ratiometric analysis is conducted to deduce the resistive
> and reactive components of the antenna and display them.
>
> Instruction manual can be found here:
>
> http://www.mfjenterprises.com/**pdffiles/MFJ-259B.pdf<http://www.mfjenterprises.com/pdffiles/MFJ-259B.pdf>
>
> While not a laboratory grade instrument, it's
> a lot of bang for the buck.
>
> The wingtip antenna you talk about in the connection is a slightly
> modified Archer. Archer mounts them to the fiberglass wing tip and
> sandwiches it between the glass and the wing root for the ground. I am
> looking for the instructions that came with the unit and will send them to
> you as soon as I find them.
>
> Yeah, Bob was a little incensed when the folks
> at Van's published dimensional details on his
> first RV wingtip offerings (and I repeated them
> in the 'Connection). Bottom line is that the antenna
> is simply a gamma-matched monopole of which there
> are many variations on a theme. The now arcane
> 'sled runner' marker beacon antennas on the belly
> are a good example.
>
> Once you have an MFJ259 in hand, you can both
> trim overall length of the Archer design to
> desired center frequency, you could also adjust
> the gamma-match and tuning capacitor for optimum
> performance too.
>
> While this might be an intellectually satisfying
> exercise (Hams can get downright pedantic in
> their quest for the Holy-SWR), it would be hard
> to observe much difference in performance between
> an Archer cookie-cutter installation and one that
> has be tuned to technical Nirvana.
>
> I would like to be able to get one of these. To work in each wing tip for
> my two vors. I have an APRS (2meter Jpole in one wingtip that may make it
> impossible to get the Archer to work.
>
> Why a j-pole? That's an awfully big antenna for
> a line-of sight application. Why not the simple
> vertical whisker?
>
> I will ask the additional questions after I send you the Archer
> instructions.
>
>
> Got the data package. What's your question?
>
>
> Bob . . .
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 6
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Subject: | Re: Cross talk problem |
Daniel,
Thanks for that. I'll give it a try.
> Another reasonable place to try is on the speaker line, where it meets the lighting
power.
Do you mean where the two sets of wires come together from their respective sources
of Audio Panel and the power/ground bus's, or from the appliance ends at
the speaker and light? Does it matter? The appliance ends are right next to each
other in a small overhead console and their wire runs are parallel for about
17', the first 5' of speaker wire being unshielded/untwisted.
Best,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=365807#365807
Message 7
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Subject: | Re: Com and Nav Radio and Antenna Questions |
At 09:56 AM 2/7/2012, you wrote:
>Bob, I have a question. How much performance degradation, TLAR
>estimate, is there from placing a com antenna in a horizontal or
>near horizontal position? Are not com radio signals vertically
>polarized? Doesn't mounting them horizontally increase there
>directional selectivity, for lack of knowing the proper term?
The ONLY time that an antenna delivers on it's theoretical
performance (radiation efficiency and patters) is on the
antenna test range under controlled conditions.
Many antennas can approach theoretical performance in service
when situated in free space and "ground" configurations
that are large compared to the frequency of interest.
In other words, antennas for GPS and transponders at
1000+ MHz do pretty well.
As you go down in frequency, it becomes increasingly
difficult to configure an antenna installation that
even approaches theoretical performance. On small structures
like airplanes with lots of 'sticky-outs' (wings, stabilizers,
landing gear, whirring props, other antennas, etc) both
radiation pattern and polarity are distorted. Out
in the vacuum of space, the theoretical loss for
a vertical antenna talking to a horizontal antenna is
huge . . . in practice here on the ground antenna range,
it's on the order of 10-20 dB. But these will be "centered
up" measurements where the two antennas are looking right
at each other.
However, as soon as you bolt the antenna to an airplane,
one's ability to predict performance variables goes down.
Someone who has measured the effects of vertical vs. horizontal
polarization on airplanes like yours might offer some
advice based on experience, but I've never met an RF guru
who would attempt to put a quantitative answer to your
question without going out to measure it - a difficult
task at best. RF squirted from (or at) your airplane's
compromised antenna is subject to MANY unpredictable
variables.
Once you've relocated your antenna, YOU are going to
become the AeroElectric-List guru for having carried out
the experiment. Put the second antenna on along with
a switch that will let you switch quickly between the
'compromised' and 'optimized' antennas. Do some listening
tests with weak stations as you fly a 360 pattern listening
for 'hot' and 'dead' spots while making not of the relative
signal strength of 'compromised' vs. 'optimized' antennas.
We conducted similar tests on our production aircraft
using a ground station at the field for a signal source.
Automated acquisition systems would gather data on
received signal strengths as the airplane maneuvers.
But attempting to predict relative antenna performance
without conducting real tests is sorta like hypothesizing
about "The theory of everything".
Here's some further reading on the topic.
http://www.astronwireless.com/topic-archives-selecting-antennas.asp
http://www.astronwireless.com/topic-archives-antennas-polarization.asp
http://home.comcast.net/~n9rla/Antenna_Polarization.PDF
Bob . . .
Message 8
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Subject: | DraftSight CAD WARNING |
I made the mistake of downloading the latest release R1.4 today. It crashes
randomly. I've tried deleting all previous versions, cleaning the registry
before downloading it, nothing seems to work. I've also found that the
circle function will not work if you specify a radius, it only works when
you specify diameter. That doesn't seem to be related to the crashing.
Anyway, if you're a DraftSight user be very wary of making an upgrade to
this release.
Rick Girard
PS I should add that I have run the previous releases for almost two years
and NEVER had a crash before.
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 9
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APRS is only available to ham operators and uses a two meter packet radio.
No text. No wifi.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Paul
Millner
Sent: Tuesday, February 07, 2012 7:46 AM
Subject: AeroElectric-List: APRS / ATRS
>> RV's with ATRS installed use the JPOLE
Are folks using ATRS (APRS?) for sending text messages also? Is there a
WiFi interface to smart phones, or what's the input device of choice?
Paul
Message 10
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I think I read about someone experimenting with a MicroTrak4 in their airplane...
http://www.byonics.com/mt-tt4
Unlike the other MicroTracks, it has a receiver on it as well, so it is capable
of receiving text.
I'm not sure about a wifi interface, but a bluetooth-serial interface for handling
APRS messages would be a pretty simple (relatively speaking) hack for android
devices.
That'd be pretty slick!
On Feb 7, 2012, at 9:46 AM, Paul Millner wrote:
>
> >> RV's with ATRS installed use the JPOLE
>
> Are folks using ATRS (APRS?) for sending text messages also? Is there a WiFi
interface to smart phones, or what's the input device of choice?
>
> Paul
>
>
>
>
>
Message 11
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Subject: | Re: Cross talk problem |
I meant where the speaker line joins the light power wiring at the panel. If it's
RF, it's leaking in from somewhere, and you need to separate that source from
the problem area.
Another possibility is clamping the ferrite mid-way down the line, on both lines
separately, or just clamping the entire bundle with one larger ferrite.
You are trying to isolate the noise source from the rest of the system (particularly
the touch-light). If you have wires bundled together, or running near each
other, RF can jump across cables. Ferrites kill the RF, but if, for example,
you put just one ferrite on the power, midway down the 17' run, the RF energy
will have no problem jumping from one cable to the other freely, bypassing the
ferrite filter.
Have you tried the experiment with the comm radio off? The RF theory sounds good,
but it's best to rule easy things out if you can, even if it sounds unlikely.
On Feb 7, 2012, at 10:54 AM, jonlaury wrote:
>
> Daniel,
> Thanks for that. I'll give it a try.
>
>
>> Another reasonable place to try is on the speaker line, where it meets the lighting
power.
>
>
> Do you mean where the two sets of wires come together from their respective sources
of Audio Panel and the power/ground bus's, or from the appliance ends at
the speaker and light? Does it matter? The appliance ends are right next to
each other in a small overhead console and their wire runs are parallel for about
17', the first 5' of speaker wire being unshielded/untwisted.
>
> Best,
> John
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=365807#365807
>
>
>
>
>
>
>
>
>
>
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