Today's Message Index:
----------------------
1. 06:21 AM - Re: Tachometer Generator Wiring (Robert L. Nuckolls, III)
2. 12:39 PM - Re: Grounding Lug (Glen Matejcek)
3. 01:32 PM - Re: Tachometer Generator Wiring (Craig Winkelmann)
4. 03:41 PM - Re: Ray Allen T2-7A trim sevro problems (Steve Leonard)
5. 04:48 PM - Re: Tachometer Generator Wiring (Craig Winkelmann)
6. 04:54 PM - Re: Ray Allen T2-7A trim sevro problems (Eric M. Jones)
7. 06:10 PM - Alternator Noise (LARRY FLORMAN, M.D.)
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 |
|
Subject: | Re: Tachometer Generator Wiring |
At 08:09 PM 9/12/2009, you wrote:
><capav8r@gmail.com>
>
>I have a tachometer generator on my aircraft. I am changing the
>tach from an analog to digital tach. The wiring from the tach gen
>is two leads and neither are shielded. Given this is an AC signal
>in the aircraft, I was wondering if these leads need to be
>shielded. Any advice or insight into tach gens would be welcome.
No. It's a sine-wave, low voltage, low frequency
signal that does not propagate electrostatically
between bundles.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
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: Grounding Lug |
HI Mike-
I have a similar configuration and used a similar solution. I acquired a tube
of goo used to protect aluminum electrical connections from corrosion and and
applied it to the joint area. I'm on the road at the moment, so I can't access
the brand, but IIRC I got it off the shelf at a local home improvement center.
Actually, I'd bet just about anything it was GB, or G&B, whatever the big
name brand is for electrical accessories.
FWIW-
>
>Time: 10:56:21 PM PST US
>From: MLWynn@aol.com
>Subject: AeroElectric-List: Grounding Lug
>
>Hi all,
>
>I am building an RV 8. The battery is rear mounted. I was planning to
>ground the battery to the lower longeron that is directly adjacent. I
>checked with Vans, who said that four or five rivets no closer than 1/2 inch
>apart is fine structurally.
>
>I had previously primed the longeron, so I carefully scraped that off and
>buffed it up with white Scotchbrite. I built a lug of 1/8th aluminum with
>a 1/4" nutplate on the bottom, which I also carefully polished up. The
>question is, is it okay to just rivet these two pieces of aluminum together or
>
>is there something I should sandwich in between them to improve the
>connection? Does the bond need to be sealed with dielectric grease or some such?
>
> What have others done in this situation?
>
>Regards,
>
>Michael Wynn
>RV 8 Finishing
>San Ramon, CA
>
Glen Matejcek
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: Tachometer Generator Wiring |
Thanks Bob. I have been told by some other folks that the tach gen can be a significant
source of noise. It is my understanding that in the original wiring
in this aircraft (Yak) the tach gen leads were shielded.
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=262817#262817
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: Ray Allen T2-7A trim sevro problems |
I can't find this in acronym finder "TSCMR" what does it mean?
SEL
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: Tachometer Generator Wiring |
Bob:
The problem I have is that at RPM below 1000, I get noise in the signal and the
tach jumps all over the place. Over 1000 RPM and all is fine. The radial engine
idles at 500 rpm so this is a problem.
The tach gen wires go to a circuit that is a basically a voltage divider and a
comparator to provide a clean pulse for the engine monitor system.
It has been suggested to 1) shield the tach gen wires to reduce noise, 2) add a
0.1 microfarad ceramic capacitor as a filter, and/or 3) change the voltage at
which the comparator triggers (raise the limit for it to trigger).
Any thoughts would be appreciated.
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=262838#262838
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 |
|
Subject: | Re: Ray Allen T2-7A trim sevro problems |
True Servo Control for MAC/RAC. This name comes from the fact that the MAC/RAC
trim box is just a motor and a position indicator pot that are not connected to
each other. The TSCMR makes it a real servo and there are advantages to doing
so. See my website.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=262839#262839
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: | Alternator Noise |
I have built a SeaRey witha Rotax 912.- It has an internal alternator.-
I have a tremendous amount of noise in the headset.- I have isolated the
problem to the regulator or alternator.- The Radio Shack filters are no
longer available.-- Any suggestions?- Ameriking?
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! --
|