Today's Message Index:
----------------------
1. 04:30 AM - Re: Fat Wire Terminals on Starter Contactor (LarryRobertHelming)
2. 05:31 AM - HSI Operations ()
3. 06:25 AM - Re: HF meters (Robert L. Nuckolls, III)
4. 06:36 AM - GPS I/O shielding (Ken Simmons)
5. 09:12 AM - Re: GPS I/O shielding (rv-9a-online)
6. 08:56 PM - Auslaenderpolitik (bob.nuckolls@cox.net)
Message 1
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| Subject: | Re: Fat Wire Terminals on Starter Contactor |
--> AeroElectric-List message posted by: "LarryRobertHelming" <lhelming@sigecom.net>
> --> AeroElectric-List message posted by: "r falstad" <bobair8@msn.com>
>
> I'm starting to wire my GlaStar. I plan on terminating the 2 AWG from the battery
+ and the 6 AWG from the alternator + to the same post on the starter contactor.
I also need to terminate the wire from the power bus somewhere and the
closest place that will see the battery is the same post on the starter contactor.
Is this right? ((Right.)) That will put three fairly large terminals
on one post. Don't you need a rubber terminal nipple to cover the terminals
and post so if anything gets loose in the engine compartment, you don't run the
risk of a direct short to ground? ((Yes you do want to insulate that.)) How
do you insulate that arrangement? ((You do what ever you do to do. Try silicone
tape or get a large termminal nipple and cut a slit in it so it will fit and
secure it with a tie wrap and/or silicone tape.))
>
> Best regards,
>
> Bob
>
((Best wishes,
Indiana Larry, RV7 Tip Up It Flies
"The American Republic will endure until the day Congress discovers
that it can bribe the public with the public's own money."
Alexis de Toqueville))
Message 2
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--> AeroElectric-List message posted by: <bakerocb@cox.net>
5/21/2005
Hello Don, Now this has really gotten below the level of "who cares", but
since you insist I'll parse your original comment on my input just a bit. I
know that you think that you said it clearly and that you think you said the
same thing that I quoted, but a reader can be mislead by your original
input. To whit:
1) <<the needle is always pointed aat the transmitter.>>
Not true for three reasons:
A) The needle on the HSI does not initially point at the transmitter on its
own. It is positioned on the compass card by the pilot rotating the needle
to make a course setting. Depending upon the aircraft location and heading
after course selection the needle may not be pointing anywhere near the
localizer transmitter (antenna).
B) Then while flying inbound on the front course region of the localizer
antenna pattern the only time the needle will actually be pointing at the
transmitter is when the aircraft is on the localizer center line. If the
aircraft is off the centerline then the needle is pointing off in space
either to the left or right of the antenna location. A more accurate
statement for the front course would be to say that the needle setting
should be on the desired inbound course and pointing in the general
direction of the transmitter.
C) When the aircraft is inbound towards the runway and the antenna location
while flying in the back course region of the localizer antenna pattern the
needle is definitely not pointed at the transmitter. Instead it is pointed
towards the rear of the aircraft because the pilot has set in the front
course inbound couse as required by the instructions that I quoted. An
accurate statement for the back couse operation would be that the needle
setting is the front course setting and the needle will be pointing in the
opposite direction of the transmitter.
2) << When you are in the backcourse it points behind the ac
nose........skip.......>>
I am not sure that everyone would know where "behind the ac nose" is. When a
person is sitting in the cockpit he could easily think that "behind the ac
nose" is in front of him.
Do you see now how a reader, particularly one not intimately familiar with
HSI operations (probably the majority of aeroelectri-list readers), could be
misled or confused by the wording in your input?
OC
AeroElectric-List message previously posted by: "DonVS" <dsvs@comcast.net>
<<Not sure what your point is. We are sayiny evactly the same thing. Don>>
AeroElectric-List message previously posted by: dsvs@comcast.net
<<OC, The HSI is no smarter, the needle is always pointed aat the
transmitter. When you are in the backcourse it points behind the ac nose
and this corrects for the "backwards" needle. Don>>
5/20/2005
Hello Don, This subject probably falls below the level of "who cares", but
since we are trying to clarify things please let me add a bit of
clarification to your input above.
Rather than parse your input I'll just quote from the printed instruction
for the KI-525A HSI: "When tuned to a localizer frequency, the course select
pointer MUST be set to the inbound front course for BOTH the front and
back-course approaches to retain this pictorial presentation." (their
emphasis)
The pictorial presentation they are referring to is the one where the
airplane is flown towards the course deviation bar in order to get to the
localizer centerline.
OC
Message 3
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 08:00 PM 5/20/2005 -0700, you wrote:
>--> AeroElectric-List message posted by: "Leo Corbalis"
><leocorbalis@sbcglobal.net>
>
>The sun finally came out today. I rounded up 3 small HF digital meters and
>my 2 other large meters. I hooked them all to a 9 volt battery. Set all to
>20 volts. I put the 3 small ones in the sun for 5 minutes. then I switched
>the board around putting the 2 big meters in the sun. I kept the battery in
>the shade. All readings held steady and fully legible.
>
>Leo Corbalis
A fine repeatable experiment sir. Thank you.
Bob . . .
Message 4
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| Subject: | GPS I/O shielding |
--> AeroElectric-List message posted by: "Ken Simmons" <ken@truckstop.com>
For everyone that helped with the intercom wiring/shielding questions, I finally
did get it all wired up and it worked great on the first go. I haven't started
the engine yet, but the strobes don't add any noise.
The next question is on GPS I/O. I'm installing a Trutrak AP and possibly a fuel
totalizer. The Trutrak harness from Steinair has a unshielded wire for the GPS
input. The fuel totalizer, bought used, also had unshielded wires for the GPS
input/output. The drawing for the GPS shows these wires shielded.
The fuel totalizer obviously worked without shielded wires and I can't imagine
Steinair making something that wouldn't work properly. Is Garmin indicating shielding
just for CYA purposes? For such short distances and a digital signal,
I don't see how it will make much difference unless I was trying to shield against
EMP.
Thanks.
Ken
DO NOT ARCHIVE
Message 5
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| Subject: | Re: GPS I/O shielding |
--> AeroElectric-List message posted by: rv-9a-online <rv-9a-online@telus.net>
The reason for shielding these signals is to protect other wires from
the electrical noise generated by the serial data signals. The serial
data signals themselves are reasonably tolerant of outside
interference... but that is installation dependent.
It's not likely to be a problem if you are just connecting locally on
your panel. Having said that, it is good practice to use shielded cable
whenever a signal is sensitive to electrical noise (audio signals) or is
a generator of electrical noise (p-leads).
In the spirit of too much information, many of the 'RS-232' signals used
in an aircraft are not true RS-232 levels. For example, hand-held GPSs
put low-voltage signals out. Generally, modern avionics will tolerate
these signals quite happily... but they are less tolerant to electrical
interference, and I would never run them off-panel or close to large
disturbers (I'm not talking about your right seat passenger here).
Vern Little, RV-9A
Ken Simmons wrote:
>--> AeroElectric-List message posted by: "Ken Simmons" <ken@truckstop.com>
>
>For everyone that helped with the intercom wiring/shielding questions, I finally
did get it all wired up and it worked great on the first go. I haven't started
the engine yet, but the strobes don't add any noise.
>
>The next question is on GPS I/O. I'm installing a Trutrak AP and possibly a fuel
totalizer. The Trutrak harness from Steinair has a unshielded wire for the
GPS input. The fuel totalizer, bought used, also had unshielded wires for the
GPS input/output. The drawing for the GPS shows these wires shielded.
>
>The fuel totalizer obviously worked without shielded wires and I can't imagine
Steinair making something that wouldn't work properly. Is Garmin indicating shielding
just for CYA purposes? For such short distances and a digital signal,
I don't see how it will make much difference unless I was trying to shield against
EMP.
>
>Thanks.
>Ken
>
>DO NOT ARCHIVE
>
>
>
>
>
>
>
Message 6
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| Subject: | Auslaenderpolitik |
--> AeroElectric-List message posted by: bob.nuckolls@cox.net
Lese selbst:
http://www.mjoelnirsseite.de/2100.htm
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