Today's Message Index:
----------------------
1. 03:19 AM - Re: Narco indicator to-from is backwards?? (Brian Lloyd)
2. 07:29 AM - Re: Grounds - XM (Bob Bittner)
3. 08:47 AM - Re: [ Dennis Johnson ] : New Email List (Robert L. Nuckolls, III)
4. 09:36 AM - Odyssey battery terminal size (Scott Diffenbaugh)
5. 10:47 AM - Electric Compass (David Shani)
6. 11:38 AM - Re: [ Dennis Johnson ] : New Email List Photo (Richard Tasker)
7. 02:34 PM - Avionics Master Switch (PeterHunt1@aol.com)
8. 05:22 PM - Hot battery contactor (Mark Sherman)
9. 05:41 PM - splicing strobe wire (Roger Evenson)
10. 05:58 PM - Re: Hot battery contactor (Matt Prather)
11. 06:01 PM - Re: splicing strobe wire (Matt Prather)
12. 06:24 PM - Another Starter Switch Scheme (Dennis Johnson)
13. 06:58 PM - Re: Electric Compass (Ron Koyich)
14. 07:00 PM - Re: Hot battery contactor (Ron Koyich)
15. 09:27 PM - Re: AeroElectric-List Digest: 9 Msgs - 07/11/04 (Speedy11@aol.com)
16. 09:28 PM - Preflight Check List Item - 0.8V (Rick Fogerson)
Message 1
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| Subject: | Re: Narco indicator to-from is backwards?? |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Hal / Carol Kempthorne wrote:
> --> AeroElectric-List message posted by: Hal / Carol Kempthorne <kempthornes@earthlink.net>
>
> Hi all,
>
> I installed a Narco VOR unit in my RV6a. Model is Nav 824 and the
> indicator is an ID-824. Cable I made up is pretty simple.
>
> All works fine except TO - FROM flag triangle is backwards. If I am south
> of the station and I set the indicator on 360, the triangle points down.
> Backwards. I can't even see how wiring it wrong could cause this effect.
>
> But what could?
Verify the following wiring:
NAV-824 P103 ID-824 Signal
(pin ID) (pin ID)
5---------------5 + From flag
K---------------6 + Right CDI
3,6-------------7 + To flag, +Left CDI (+8v reference)
D---------------1 Sin/Cos pot 1 (OBS)
E---------------2 Sin/Cos pot 2 (OBS)
F---------------3 Sin/Cos pot 3 (OBS)
H---------------4 Sin/Cos pot 4 (OBS)
1--.
| ID-824/825 enable
4--'
Note 1: make sure there is no jumper between pins 10 and 12 of P103 on the NAV-824.
Note 2: you can use either pin 3 or pin 6 on P103 to provide the +8V ref for the
ID-824.
Since the meter movement for the CDI and for the TO/From flag share a common, it
strikes me as unlikely that one could be reversed while the other indicates
correctly. This leads me to wonder if the OBS resolver pot is wired backwards
or if the 30 Hz reference phase inside the receiver is reversed. The result
of that would be reversed to/from flag behavior. (I forget whether that would
reverse the sense of the CDI too.)
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.270.912.0788 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 2
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| Subject: | Re: Grounds - XM |
07/12/2004 09:27:36 AM,
Serialize complete at 07/12/2004 09:27:36 AM
--> AeroElectric-List message posted by: Bob Bittner <rbittner@us.ibm.com>
A friend of mine who just installed an XM receiver had similar noise
issues, including messing with GPS reception. A phone call to XM
discovered they have an updated, better-shielded unit. They agreed to
replace his. Give 'em a call.
---------------------------------------------- >+
Bob Bittner
Message 3
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| Subject: | Re: [ Dennis Johnson ] : New Email List |
Photo Share Available!
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
Photo Share Available!
At 08:24 PM 7/11/2004 -0700, you wrote:
>--> AeroElectric-List message posted by: Email List Photo Shares
><pictures@matronics.com>
>
>
>A new Email List Photo Share is available:
>
> Poster: Dennis Johnson <pinetownd@volcano.net>
>
>
> Subject: Revised Starter/Mag Switches
>
>
>http://www.matronics.com/photoshare/pinetownd@volcano.net.07.11.2004/index.html
Dennis, I can't get this file to download from Matronics. Matt
may have filters to prevent anything but known picture formats from
being published there and you appear to have posted an AutoCAD .dwg
file. Mail a copy directly to me at mailto:rnuckolls@aeroelectric.com
Bob . . .
Message 4
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| Subject: | Odyssey battery terminal size |
--> AeroElectric-List message posted by: "Scott Diffenbaugh" <diff@foothill.net>
I'm sure this has been addressed before, but I searched and could not find
anything.
The terminals on my Odyssey battery take a 6mm diameter (about 0.233inch)
stainless steel bolt. Actually it came with stainless steel allen head
screws, with a notice to torque to 50 inch pounds. My contactors and
starter have 5/16" (.312inch) terminals. If I recall, the starter could
pull up to 200A.
Any problems with the smaller diameter terminals?
Is it a good idea to replace my 5/16" (hole) battery cable terminals with
ones to fit the 6mm terminal bolts, or is there a special reducing washer to
use in case I need to replace a battery in the field with one that uses
5/16" bolts? (I can make brass reducing washers on my lathe).
If I replace the terminal allen head screws with hex head bolts for
maintenance convenience, is there a minimum tensile strength bolt I should
specify?
Should I use lock washers in addition to the flat washers?
Sorry to be so anal, but after careful design of a dual alternator system, I
don't want to have a weak link.
Thank you in advance for your help.
Scott Diffenbaugh
diff@foothill.net
Message 5
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| Subject: | Electric Compass |
--> AeroElectric-List message posted by: "David Shani" <David.Shani@sanmina-sci.com>
Hi All,
I bought in a garage sale Electric Compass manufactured by aircraft
inst. & development Inc. from Wichita Kansas.
Part number 17-111.
This compass has 4 leads coming into it with markings A, B, C, and D.
Any information on this product and what it expect to see on each lead
would be appreciated.
Thanks,
David
Message 6
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| Subject: | Re: [ Dennis Johnson ] : New Email List Photo |
Share Available!
--> AeroElectric-List message posted by: Richard Tasker <retasker@optonline.net>
It worked fine for me and, yes, it is an AutoCAD file.
Dick Tasker
Robert L. Nuckolls, III wrote:
>--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
Photo Share Available!
>
>At 08:24 PM 7/11/2004 -0700, you wrote:
>
>
>>--> AeroElectric-List message posted by: Email List Photo Shares
>><pictures@matronics.com>
>>
>>
>>A new Email List Photo Share is available:
>>
>> Poster: Dennis Johnson <pinetownd@volcano.net>
>>
>>
>> Subject: Revised Starter/Mag Switches
>>
>>
>>http://www.matronics.com/photoshare/pinetownd@volcano.net.07.11.2004/index.html
>>
>>
>
> Dennis, I can't get this file to download from Matronics. Matt
> may have filters to prevent anything but known picture formats from
> being published there and you appear to have posted an AutoCAD .dwg
> file. Mail a copy directly to me at mailto:rnuckolls@aeroelectric.com
>
> Bob . . .
>
>
Message 7
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| Subject: | Avionics Master Switch |
--> AeroElectric-List message posted by: PeterHunt1@aol.com
Dave, I support Mark's response to your questioning the need for an avionics
master switch. Lots in the archives if you care to look. I too am use to an
avionics master switch, so I put my radios on my essential bus and put a
switch on my essential bus (labled it avionics) which gets turned on after engine
startup. Was that necessary? I don't know. Yes, it is another failure point,
but it gives me comfort with the engine startup issue.
Pete
RV-6
Clearwater, FL
Message 8
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| Subject: | Hot battery contactor |
--> AeroElectric-List message posted by: Mark Sherman <msherman95632@yahoo.com>
Good afternoon all.
I am installing the instrument panel in my CH-701 and
am testing the various components. The first thing I
hooked up was the battery contactor so I would have
12v to the fuse blocks and then test each component
separately. After about ten minutes I noticed that
the contactor was so hot that I couldn't touch it for
more than a second. I was wondering if this in
normal?
My only experience with battery contactors has been
in certified aircraft, with the contactor in the back
with the battery. Out of sight out of mind, don't
know if they were running hot or not.
Thanks for your help.
Mark S.
CH-701/Rotax 912uls
__________________________________
http://promotions.yahoo.com/new_mail
Message 9
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| Subject: | splicing strobe wire |
--> AeroElectric-List message posted by: "Roger Evenson" <revenson@comcast.net>
My Whelen strobe wire is 3 (actually 4) wire shielded type. It has three #18 wires
wrapped with a thin alum foil like paper, then outside this is a bare wire.
This is all sheathed with a plastic (tetzel?) type covering.
What's the proper way to splice this kind of wire? More specifically, is there
any harm in wrapping the spliced joint with a separate piece of this 'alum foil'?
In other words, does the 'foil' need to be one continuous piece to do it's
shielding job?
Roger.
Message 10
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| Subject: | Re: Hot battery contactor |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
You might verify that you have a battery contactor and not
a starter contactor. The coil winding resistance is much higher
for the battery contactor, and the power dissipation is consequently
much lower - allowing continuous service. It seems like I
have read where the starter contactor coil resistance is in the
range of 2ohms (6A/72W), and the battery relays are around
15ohms (~1A/12W).
Regards,
Matt-
> --> AeroElectric-List message posted by: Mark Sherman
> <msherman95632@yahoo.com>
>
> Good afternoon all.
>
> I am installing the instrument panel in my CH-701 and
> am testing the various components. The first thing I
> hooked up was the battery contactor so I would have
> 12v to the fuse blocks and then test each component
> separately. After about ten minutes I noticed that
> the contactor was so hot that I couldn't touch it for
> more than a second. I was wondering if this in
> normal?
>
> My only experience with battery contactors has been
> in certified aircraft, with the contactor in the back
> with the battery. Out of sight out of mind, don't
> know if they were running hot or not.
>
> Thanks for your help.
>
> Mark S.
> CH-701/Rotax 912uls
>
>
> __________________________________
> http://promotions.yahoo.com/new_mail
>
>
Message 11
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| Subject: | Re: splicing strobe wire |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
I don't think there is any benefit to adding a piece of foil to
the joint. Just splice the drain wire (that outer conductor) and
you should be in good shape. The frequencies associated
with the strobe system don't warrant anything more sophisticated
than that - especiall if the exposed section of wire is relatively
short (maybe less than 1"). The shielded wire is not a tightly
controlled impedance environment where the shielding would
be critical.
Regards,
Matt-
N34RD
> --> AeroElectric-List message posted by: "Roger Evenson"
> <revenson@comcast.net>
>
> My Whelen strobe wire is 3 (actually 4) wire shielded type. It has
> three #18 wires wrapped with a thin alum foil like paper, then outside
> this is a bare wire. This is all sheathed with a plastic (tetzel?) type
> covering.
>
> What's the proper way to splice this kind of wire? More specifically,
> is there any harm in wrapping the spliced joint with a separate piece of
> this 'alum foil'? In other words, does the 'foil' need to be one
> continuous piece to do it's shielding job?
>
> Roger.
>
>
Message 12
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| Subject: | Another Starter Switch Scheme |
--> AeroElectric-List message posted by: "Dennis Johnson" <pinetownd@volcano.net>
Greetings,
I've posted an AutoCAD LT 97 file at:
http://www.matronics.com/photoshare/pinetownd@volcano.net.07.11.2004/index.html
that shows a starter switch scheme I'm considering for my project. The idea is
to have a separate 2-5 toggle switch (Off-On-(Start)) for each magneto. The
12 volt power for the starter contactor coil comes from the main bus into the
right mag switch and then to the left mag switch so that when both toggle switches
are held in the top position, three things happen:
1. The right, non-impulse, magneto is grounded.
2. The left, impulse, magneto is not grounded.
3. The starter contactor closes because the coil is energized and the starter
engages.
This is a modification of Z-11. It seems to me to provide the benefit of eliminating
the need for a pushbutton starter switch. It also seems to provide the
same benefit; namely, disabling the right mag during start.
Any comments?
Additional info:
Lancair Legacy, all carbon fiber aircraft.
Magneto ignition; standard right mag and impulse coupled left mag.
Z-13, all electric airplane on a budget.
Two alternators, single battery.
By the way, I'd like to give Bob another thanks for his valuable contributions
to the OBAM community. I've studied the 'Connection and attended the Watsonville
seminar and both were extremely valuable. Combined with this newsgroup, I
can't fail!
Best,
Dennis Johnson
Message 13
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| Subject: | Electric Compass |
--> AeroElectric-List message posted by: "Ron Koyich" <Ron@Koyich.com>
Hi, David - sounds like you may be the new owner of a 'flux gate', or a
repeater compass remote sensor.
The terminal labelling seems familiar.
Is it a little bowl shaped unit a few inches across with the terminals on
the flat side? Does it have mounting holes that allow the unit to be
'turned' in its orientation a few degrees?
If yes to these questions, you may need to find out what compass system
it was from and buy the rest of the bits to make it work.
Slaved compass systems are typically an external gyro, very often part of
an HSI system, which is corrected for precession by reference to earth's
magnetic. The device you have sounds like the sensor for the earth's
magnetism.
There were also remote compass units in early aviation, without gyros -
a 400Hz synchro system would transfer the heading from the unit to the
panel mounted indicator. They flung themselves around like a whisky
compass does, being only slightly stabler.
What other junk did you buy?
Ron
Message 14
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| Subject: | Hot battery contactor |
--> AeroElectric-List message posted by: "Ron Koyich" <Ron@Koyich.com>
Hi, Mark - sounds like the contactor is not designed for constant duty.
Perhaps a starter contactor, which I believe are rated for a lower
hold-in voltage and intermittent use.
Ron
Message 15
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| Subject: | Re: AeroElectric-List Digest: 9 Msgs - 07/11/04 |
--> AeroElectric-List message posted by: Speedy11@aol.com
In a message dated 7/12/2004 2:59:57 AM Eastern Standard Time,
aeroelectric-list-digest@matronics.com writes:
Checked my XM installation today. Separate ground, but a shared power run
with the headsets. The XM power supply is truly the culprit of the
high-pitched noise in the headphones. Any idea where I can get a "quiet' 6
volt power supply? I need 12 volts in and 6 out.
David,
When you find the appropriate solution, please post it so the rest of us
dummies (referring only to myself, of course) who plan to install XM can benefit
from your discoveries.
Thanks,
Stan Sutterfield
Message 16
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| Subject: | Preflight Check List Item - 0.8V |
--> AeroElectric-List message posted by: "Rick Fogerson" <rickf@cableone.net>
Hi Bob,
There was a preflight item you recommended I check on my RV 6A that had to do with
0.8 Volts and the essential bus. It's been 5 years since I've owned the airplane.
Is the test still recommended and if it is could you refresh my memory
on how the test was done and what it accomplished.
Thanks, Rick Fogerson
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