Today's Message Index:
----------------------
1. 05:12 AM - Pressure switch failures (Robert L. Nuckolls, III)
2. 07:04 AM - Re: [Probable SPAM] Garmin GTX 320A circuit breaker ()
3. 09:17 AM - Intercom XM Radio noise (Ron Patterson)
4. 11:27 AM - Where to find closed-end lugs for Super-CCA cable (DeWitt Whittington)
5. 12:33 PM - Re: Where to find closed-end lugs for Super-CCA cable (Richard Girard)
6. 12:46 PM - Use of Vans ES14684 60A Alternator (Jerry Jerome)
7. 01:17 PM - Help debugging an alternator noise problem (Dr. Andrew Elliott)
8. 01:26 PM - Re: Where to find closed-end lugs for Super-CCA cable (ROGER & JEAN CURTIS)
9. 07:18 PM - APRS for aircraft (Fergus Kyle)
10. 10:37 PM - breaker specs (B Tomm)
Message 1
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Subject: | Pressure switch failures |
At 10:46 AM 12/2/2008 +0100, you wrote:
>Hi Bob,
>
>I just read your article on the subject and maybe found reason why
>my retract gear pressure switches go kaput after brief service..
>could it be due to spikes from their intermittent duty relays (sold
>from Lancair parts provider) which probably don't have internal
>diode (how can I check?).
>
>Now my question: if I want to try an external spike catching diode,
>what are its requested specs?
>Better, can you suggest a model?
It's unlikely that your contactors came with
diodes installed. I used to sell an intermittent
duty contactor that did feature built in spike
suppression but it was only one of dozens of
similar parts by the same company that did not
have diodes installed.
I like the 3 amp rated devices like 1N5400
series. Exact voltage or current rating is
not critical. These devices have relatively
robust lead wires and housings. See:
http://www.radioshack.com/product/index.jsp?productId 62578
Can you share the part numbers and/or specifications
for the pressure switches? It may be that your system
would benefit from addition of solid-state buffers
between the switches and contactors. Those intermittent
duty contactors take 4-5 amps to close and might be
tough on the switches whether or not spike suppressors
are installed on the contactors. Also, if you have a
failed pressure switch you could send me, it would
be useful to do a tear-down inspection and see if we
can learn more about the failure mode.
But in any case, addition of the diodes on the
contactor coils is not a bad thing to do and may
well take care of most of your problems.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 2
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Subject: | Garmin GTX 320A circuit breaker |
Voltage 11-33, Amps 5.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Gig
Giacona
Sent: Monday, December 01, 2008 9:40 AM
Subject: [Probable SPAM] AeroElectric-List: Garmin GTX 320A circuit
breaker
<wrgiacona@gmail.com>
Anyone know off hand what CB size you need for a Garmin GTX 320A?
--------
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=217149#217149
Message 3
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Subject: | Intercom XM Radio noise |
Can this be managed with a filter? Can anyone tell me what is a good filter
to add to cut out radio interference in my headset as I listen to music th
rough my intercom? Sounds like someone running their finger up and down the
ir lips as the speak.....sort of like 10 or 20 blips per second of momentar
y block of the signal. Annoying. The Comm seems unaffected.
-
Ron
Message 4
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Subject: | Where to find closed-end lugs for Super-CCA cable |
Where is the best place to buy lugs for Eric Jones' Super-CCA
electric cable in #4 size? My partners wants a "closed end" type as
suggested by Bob Nuckolls on one of his weekend seminars. It appears
that Eric only sells the open end type. This would be a type which
uses the "solder pellet" which you drop into the lug, then insert the
wire and heat.
Dee
DeWitt (Dee) Whittington
406 N Mulberry St
Richmond, VA 23220-3320
(804) 358-4333 phone and fax
SKYPE: hilltopkid
dee.whittington@gmail.com
Message 5
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Subject: | Re: Where to find closed-end lugs for Super-CCA cable |
Try welding supply and farm supply stores.
Rick
On Tue, Dec 2, 2008 at 1:24 PM, DeWitt Whittington <dewittw@earthlink.net>wrote:
> Where is the best place to buy lugs for Eric Jones' *Super-CCA electric
> cable in #4 size? My partners wants a "closed end" type as suggested by Bob
> Nuckolls on one of his weekend seminars. It appears that Eric only sells the
> open end type. This would be a type which uses the "solder pellet" which
> you drop into the lug, then insert the wire and heat.
>
> *Dee
>
> DeWitt (Dee) Whittington
> 406 N Mulberry St
> Richmond, VA 23220-3320
> (804) 358-4333 phone and fax
> SKYPE: hilltopkid
> dee.whittington@gmail.com
>
>
Message 6
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Subject: | Use of Vans ES14684 60A Alternator |
Sorry if this question has been dealt with before, but I would like to know
if use of a Vans ES 14684 60A alternator with internal regulation would be
suitable in a system designed around Bob's Z-11 Generic Light Aircraft
Electrical System. As this alternator is internally regulated, is the
generic "Ford" regulator still needed or should it be eliminated? I am also
considering purchase of the Overvoltage Module (OVM-14) from B & C but see
there is a caution about using OV protection with this alternator on Vans
site. The caution concerns a need to contact the manufacturer of the OV
device to ensure any special wiring requirements are met. Would the Z-11
diagram show the correct wiring for use of this device with this alternator?
I also have a Grand Rapids (model 4000) EIS I am planning on using so I plan
on eliminating the low voltage monitor module (AEC 9005 - 101) as I believe
this function is included in the EIS. Any comments?
Thanks for your help.
Regards,
Jerry
Message 7
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Subject: | Help debugging an alternator noise problem |
I submitted this before, but am now including much more information, per
Bob's request.
Problem - I am getting a lot of clearly alternator (or voltage regulator
noise) on the receive side of my radio. There is no noise on only
battery power, or with the alternator disconnect relay unpowered. The
noise is very low at idle, and increases in both volume and frequency as
RPM increases, At high RPM makes it very difficult to understand
transmissions. Radio is a Terra 760D fed from the main bus. I have
checked to be sure that the problem persists even with no other
equipment powered up (not coming somehow from lights or avionics).
System - The system is pretty similar to Z-17, except that I have two
batteries (PC-680) connected through a marine selector switch
(A-B-Both-Off) and no master relay.
There is a secondary EFIS bus which can be powered through a DC-DC
regulator, but the problem does not depend on whether this bus is
powered up or not.
In place of the SD-8, I have an 18 amp John Deere permanent magnet
alternator feeding through a 4-wire motorcycle voltage regulator (Crane
Fireball, installation doc here http://tinyurl.com/17a), connected to
the main bus using the B&C relay/overvoltage protection kit as shown in
the diagram, which includes a big filter capacitor.
Bus voltage is fine with the alternator connected (about 14V) and the
charging portion is working OK.
Questions:
[1] Should not the big capacitor be filtering out this noise?
[2] Could the capacitor be bad? Can I test it?
[3] What would happen if I wired the cap backwards?
(I will check ASAP.)
[4] Is there other or additional filtering I could put on the
feed? If so, what?
[5] Are there other things I could check/test?
Thanks,
Andy Elliott, Mesa, AZ
N601GE,601XL/TD,Corvair
Message 8
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Subject: | Where to find closed-end lugs for Super-CCA cable |
I made my own lugs with soft copper tubing. I drilled a hole about 1"
deep
into an aluminum block, the same diameter as the copper tubing. Drill
the
hole near the edge of the block. Cut a piece of tubing about 2" long
and
insert it into the hole. I use an arbor press and place the block with
the
tubing inserted, on a flat plate and press the copper flat against the
plate. When you pull the tubing out of the block, it will have a nice
round
barrel for the cable to be inserted. Drill a hole in the tab and round
the
edges of the tab for a finished look. Solder in the wire, add shrink
sleeve
and you are done. I found with minimal practice I was able to make very
nice lugs. If you don't have an arbor press you can gently pound the
tab
flat with a hammer.
Roger
Try welding supply and farm supply stores.
Rick
On Tue, Dec 2, 2008 at 1:24 PM, DeWitt Whittington
<dewittw@earthlink.net>
wrote:
Where is the best place to buy lugs for Eric Jones' Super-CCA electric
cable
in #4 size? My partners wants a "closed end" type as suggested by Bob
Nuckolls on one of his weekend seminars. It appears that Eric only sells
the
open end type. This would be a type which uses the "solder pellet"
which
you drop into the lug, then insert the wire and heat.
Dee
Message 9
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Subject: | APRS for aircraft |
Lincoln,
Sorry to be so late to reply to your question of utilizing
APRS for flight positioning - my computor go doodoo.
I haven't searched out all the answers you received but
noted fairly early that no one mentioned that it is purely an licensed
Amateur Radio function. That is, you must be licensed to utilize 144.39MHz
as a Ham. Like so many other things devised and made to work by hams and
then copied for profit, APRA is the brainchild of W4APR who first fixed a
transmitter into the football hat worn by the Navy players as they
progressed from the Navy college up to the Army college for the annual ball
game.
He had applied his transmitter onto Navy cars accompanying
the runner previously but managed a miniature form for the runners helmet.
Having given the idea broad freedom, he saw hams apply it to their cars and
other vehicles, eventually to their aircraft. It is possible now to send
your details directly through the email system to your computer and file
same as a flight log of sorts.
As someone else wrote, the end of your trail is either an
airport, airfield or your crash site. PRBs will do the same thing and UPS
traces your truck by means of a commercial copy, so it's not new. It was
inevitable that someone would copy the idea onto a commercial frequency and
sell it. Like most things, you can do it free with difficulty, or just pay
every time otherwise.
Ferg
Europa 914 Classic
Message 10
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Bob, et al
I'm trying to educate myself about circuit breakers (Klixon in this case).
I can't find any tech info online, nor any sales info from Mouser, Digi-key,
Electronic etc. Can you suggest a source?
I'm beginning to think Klixon is not a manufacture's name but just a product
name. Still, I should be able to find performance specs online though, no?
Relevance: Due to space and design goals, I am incorporating fuse blocks
and some breakers (Klixon) into my panel (RV7A). However, I have just
recently discovered another type of breaker that I'm sure you're aware of,
namely the switch/breaker, see
http://www.avionicsmall.com/index.php?main_page=product_info
<http://www.avionicsmall.com/index.php?main_page=product_info&cPath=189&prod
ucts_id=8161> &cPath=189&products_id=8161
This nifty puppy will save space by incorporating a switch and circuit
breaker into one unit at comparable cost to a switch and klixon breaker.
However, when reading the performance specs, (click on the data sheet tab
here http://www.mouser.com/Search/Refine.aspx?Keyword=655-W31-X2M1G-5 )
it looks to be very slow acting at the current flows that we are dealing
with. I would think that we want an overload to be shut own within seconds
not minutes. Even at a response time of 10 seconds, the amount of overload
would have to be 150-250% of rated value ( I suppose dependant on ambient
temperature). I don't think this is acceptable for an aircraft, do you?
This is why I wonder what the Klixon's response times are. Maybe they are
no better. I'm pretty sure that an ATO type fuse will be lightning fast at
150% overload, no? I look forward to you comments.
Thanks
Bevan
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