Today's Message Index:
----------------------
1. 12:37 PM - shielded tach wire (T A LEWIS)
2. 03:21 PM - Re: shielded tach wire (Yak Pilot)
3. 03:25 PM - Re: Re: Low Boost? (Yak Pilot)
4. 03:42 PM - Re: shielded tach wire (T A LEWIS)
5. 03:49 PM - Re: Re: Low Boost? (A. Dennis Savarese)
6. 04:09 PM - Re: shielded tach wire (Yak Pilot)
7. 07:53 PM - Re: shielded tach wire (Walter Lannon)
8. 10:42 PM - Re: shielded tach wire (Tom Elliott)
Message 1
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| Subject: | shielded tach wire |
Hi All '
This question is about the wiring in my CJ- 6A .
I was trying to track down a noise in my radio and noticed that the wires to the
front tach indicator are shielded
but there is no shielding on the wires to the reartach indicator in my plane .
Does anyone know if this is normal ? This is a 1965 model .
Terry Lewis
Message 2
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| Subject: | Re: shielded tach wire |
Terry, I don't know JACK about CJ's, (and I am sorry for not answering your question)
but I do know something about Tach Generators. They are extremely powerful
generators of noise that can not only be picked up by a radio.... in one
case I have seen it be so bad that it actually ruined the front end stage on a
Balkan-5 receiver in a YAK-52! That said, you should always ... as in ... ALWAYS
... use well shielded wire for anything hooked to a Tach Generator. Remember
though, the easiest way to determine if your noise is coming from that source
is to simply unhook the cannon plug on the tach generator and see if the
noise goes away. Then work from there. Two big sources of noise ... "P" leads
and Tach generator wiring.
There is nothing wrong with changing any original design to add shielded wire.
If the original design in the CJ did not use shielded wire, I kind of think they
should have.
A little trick you can also use ... grab a handheld radio and get an adapter so
you can plug in a headset. Then use the rubber ducky antenna as a "wand" to
walk around your airplane with the engine running and holding the antenna near
wiring bundles to try and determine where noise is coming from. Pretty crude,
but it does work.
Good Luck.
Mark
--- On Thu, 9/9/10, T A LEWIS <talew@bellsouth.net> wrote:
> From: T A LEWIS <talew@bellsouth.net>
> Subject: Yak-List: shielded tach wire
> To: "yak list" <yak-list@matronics.com>
> Date: Thursday, September 9, 2010, 3:30 PM
> A LEWIS <talew@bellsouth.net>
>
> Hi All '
> This question is about the wiring in my CJ- 6A .
> I was trying to track down a noise in my radio and noticed
> that the wires to the
> front tach indicator are shielded
> but there is no shielding on the wires to the reartach
> indicator in my plane .
> Does anyone know if this is normal ? This is a 1965 model
> .
> Terry Lewis
>
>
>
> Forum -
> FAQ,
> - MATRONICS WEB FORUMS -
> List Contribution Web Site -
> -Matt
> Dralle, List Admin.
>
>
>
>
Message 3
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Just to add to the already good advice....
-
I have had the primer hose rupture about 3 times now on my YAK-50.- If th
at line is leaking, you will also have low manifold pressure at Wide Open T
hrottle.---
-
Yes, I need to put American braided hose in there.- I keep replacing it w
ith the Russian hose... stupid I know.
-
Mark
--- On Wed, 9/8/10, A. Dennis Savarese <dsavarese0812@bellsouth.net> wrote:
From: A. Dennis Savarese <dsavarese0812@bellsouth.net>
Subject: Re: Yak-List: Re: Low Boost?
RPM hunting - just for the heck of it, have you recently removed and cleane
d the prop governor oil/finger screen on the right side of the nose case?
- Most likely not related to the manifold pressure question/issue.
-
I would like to know what your field elevation is.-- As you know, the m
anifold pressure gauge reads atmospheric pressure with the engine off.- A
ssuming your manifold pressure gauge is reasonably calibrated (from what I
have seen, many are not), 735 mm with the engine off would suggest your fie
ld elevation is about 1000 feet or about 300 meters.- You can easily chec
k the calibration of your manifold pressure gauge by setting your field ele
vation on your altimeter and reading the Kollsman window.- US altimeters
will need to be converted from inches to millimeters.- Compare the MP gau
ge to the altimeter.- The MP gauge can be adjusted.- There is a small c
overed hole in the rear of the MP gauge.- If I remember correctly, it is
a little stick-on cover.- Remove it and you will see the adjustment screw
inside.- You will need a special slotted tool to adjust it.- But it ca
n be done.-
-
Have you tightened all of the intake tube gland nuts and the intake tube co
llars?- If you have an intake drain kit, check to make sure there are no
leaks from the fittings on the intake drain kit.- Any leaks around the in
take tubes will cause a reduction in manifold pressure.-- Check the fle
xible hose from the top of the supercharger to the manifold pressure gauge.
- The hose itself may be leaking.
-
Dennis
----- Original Message -------
From: Yakbaas
Sent: Tuesday, September 07, 2010 3:22 PM
Subject: Yak-List: Re: Low Boost?
I have 735mm- with engine off and only get 830mm on take-off roll.Still g
et 99% on rpm.
Had 2 take-offs in the last 20 hours where the rpm "hunt" between 99% and 8
9% (WOT),came back to 80% and still hunting 5% up and down.Only when I set
70% and 700mm it stabilized.Never done it again!
I don't think the 2 are related though.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311727#311727
http://www.matronics==================
======<;--- via the Web href="http://forums.matronics.c
om">http://forums.matronics.com
_p;-------- generous bsp;-----------
-------- href="http://www.matronics.com/contribution">htt
p://www.matronics.com/c================
Message 4
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| Subject: | Re: shielded tach wire |
Thanks Mark,
I like your idea for the use of the hand held radio . I'll try
that this weekend .
Terry
----- Original Message ----
From: Yak Pilot <yakplt@yahoo.com>
Sent: Thu, September 9, 2010 6:15:19 PM
Subject: Re: Yak-List: shielded tach wire
Terry, I don't know JACK about CJ's, (and I am sorry for not answering your
question) but I do know something about Tach Generators. They are extremely
powerful generators of noise that can not only be picked up by a radio.... in
one case I have seen it be so bad that it actually ruined the front end stage on
a Balkan-5 receiver in a YAK-52! That said, you should always ... as in ...
ALWAYS ... use well shielded wire for anything hooked to a Tach Generator.
Remember though, the easiest way to determine if your noise is coming from that
source is to simply unhook the cannon plug on the tach generator and see if the
noise goes away. Then work from there. Two big sources of noise ... "P" leads
and Tach generator wiring.
There is nothing wrong with changing any original design to add shielded wire.
If the original design in the CJ did not use shielded wire, I kind of think they
should have.
A little trick you can also use ... grab a handheld radio and get an adapter so
you can plug in a headset. Then use the rubber ducky antenna as a "wand" to
walk around your airplane with the engine running and holding the antenna near
wiring bundles to try and determine where noise is coming from. Pretty crude,
but it does work.
Good Luck.
Mark
--- On Thu, 9/9/10, T A LEWIS <talew@bellsouth.net> wrote:
> From: T A LEWIS <talew@bellsouth.net>
> Subject: Yak-List: shielded tach wire
> To: "yak list" <yak-list@matronics.com>
> Date: Thursday, September 9, 2010, 3:30 PM
> A LEWIS <talew@bellsouth.net>
>
> Hi All '
> This question is about the wiring in my CJ- 6A .
> I was trying to track down a noise in my radio and noticed
> that the wires to the
> front tach indicator are shielded
> but there is no shielding on the wires to the reartach
> indicator in my plane .
> Does anyone know if this is normal ? This is a 1965 model
> .
> Terry Lewis
>
>
>
> Forum -
> FAQ,
> - MATRONICS WEB FORUMS -
> List Contribution Web Site -
> -Matt
> Dralle, List Admin.
>
>
>
>
Message 5
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Excellent Mark! Didn't think about that one!
Dennis
----- Original Message -----
From: Yak Pilot
To: yak-list@matronics.com
Sent: Thursday, September 09, 2010 5:20 PM
Subject: Re: Yak-List: Re: Low Boost?
Just to add to the already good advice....
I have had the primer hose rupture about 3 times now on my
YAK-50. If that line is leaking, you will also have low manifold
pressure at Wide Open Throttle.
Yes, I need to put American braided hose in there. I keep
replacing it with the Russian hose... stupid I know.
Mark
--- On Wed, 9/8/10, A. Dennis Savarese
<dsavarese0812@bellsouth.net> wrote:
From: A. Dennis Savarese <dsavarese0812@bellsouth.net>
Subject: Re: Yak-List: Re: Low Boost?
To: yak-list@matronics.com
Date: Wednesday, September 8, 2010, 8:50 AM
RPM hunting - just for the heck of it, have you recently
removed and cleaned the prop governor oil/finger screen on the right
side of the nose case? Most likely not related to the manifold pressure
question/issue.
I would like to know what your field elevation is. As you
know, the manifold pressure gauge reads atmospheric pressure with the
engine off. Assuming your manifold pressure gauge is reasonably
calibrated (from what I have seen, many are not), 735 mm with the engine
off would suggest your field elevation is about 1000 feet or about 300
meters. You can easily check the calibration of your manifold pressure
gauge by setting your field elevation on your altimeter and reading the
Kollsman window. US altimeters will need to be converted from inches to
millimeters. Compare the MP gauge to the altimeter. The MP gauge can
be adjusted. There is a small covered hole in the rear of the MP gauge.
If I remember correctly, it is a little stick-on cover. Remove it and
you will see the adjustment screw inside. You will need a special
slotted tool to adjust it. But it can be done.
Have you tightened all of the intake tube gland nuts and the
intake tube collars? If you have an intake drain kit, check to make
sure there are no leaks from the fittings on the intake drain kit. Any
leaks around the intake tubes will cause a reduction in manifold
pressure. Check the flexible hose from the top of the supercharger to
the manifold pressure gauge. The hose itself may be leaking.
Dennis
----- Original Message -----
From: Yakbaas
To: yak-list@matronics.com
Sent: Tuesday, September 07, 2010 3:22 PM
Subject: Yak-List: Re: Low Boost?
<riaan@golfcartpro.co.za>
I have 735mm with engine off and only get 830mm on take-off
roll.Still get 99% on rpm.
Had 2 take-offs in the last 20 hours where the rpm "hunt"
between 99% and 89% (WOT),came back to 80% and still hunting 5% up and
down.Only when I set 70% and 700mm it stabilized.Never done it again!
I don't think the 2 are related though.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311727#311727
http://www.matronics==================
======<; via the Web
href="http://forums.matronics.com">http://forums.matronics.com
_p; generous bsp;
href="http://www.matronics.com/contribution">http://www.matronics.com/c
================
=nofollow target=_blank>http://www.matronics.com/Navigator?Yak-List
et=_blank>http://forums.matronics.com
llow target=_blank>http://www.matronics.com/contribution
Message 6
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| Subject: | Re: shielded tach wire |
Good luck...
If you try the handheld method, the best way is to have a step attenuator on the
front end so you can reduce receiver sensitivity. You probably won't have that
... so time to improvise. Lots of ways to do this, but worse come to worse,
take off the rubber duck. Stick a short (aboout 19 inches or so) safety wire
into the center conductor hole of the rubber duck connector on the handheld
(usually a BNC connector). Hopefully not an SMA ... they are so small they are
a pain to work with. Regardless, if you get too much noise, just start cutting
the antenna wire shorter and shorter.
Another method.... hook a piece of coax to the antenna jack with a connector on
it. On the other end, strip back the shield to expose the center conductor (keep
the dialectric on the center conductor, just remove the shield). Around
22 inches is 137 Mhz or so... But if you get too much noise... wrap the center
exposed end up in a loop.
Point is to reduce sensitivity... and you can do that by just making your antenna
smaller and smaller.
Yes, a step attentuator is the RIGHT way, but few folks have one of those laying
around.
Mark
--- On Thu, 9/9/10, T A LEWIS <talew@bellsouth.net> wrote:
> From: T A LEWIS <talew@bellsouth.net>
> Subject: Re: Yak-List: shielded tach wire
> To: yak-list@matronics.com
> Date: Thursday, September 9, 2010, 6:38 PM
> A LEWIS <talew@bellsouth.net>
>
> Thanks Mark,
> I like your idea for the use of the hand held radio . I'll
> try
> that this weekend .
> Terry
>
>
>
> ----- Original Message ----
> From: Yak Pilot <yakplt@yahoo.com>
> To: yak-list@matronics.com
> Sent: Thu, September 9, 2010 6:15:19 PM
> Subject: Re: Yak-List: shielded tach wire
>
>
> Terry, I don't know JACK about CJ's, (and I am sorry for
> not answering your
> question) but I do know something about Tach Generators.
> They are extremely
> powerful generators of noise that can not only be picked up
> by a radio.... in
> one case I have seen it be so bad that it actually ruined
> the front end stage on
> a Balkan-5 receiver in a YAK-52! That said, you should
> always ... as in ...
> ALWAYS ... use well shielded wire for anything hooked to a
> Tach Generator.
> Remember though, the easiest way to determine if your noise
> is coming from that
> source is to simply unhook the cannon plug on the tach
> generator and see if the
> noise goes away. Then work from there. Two big sources
> of noise ... "P" leads
> and Tach generator wiring.
>
>
> There is nothing wrong with changing any original design to
> add shielded wire.
> If the original design in the CJ did not use shielded wire,
> I kind of think they
> should have.
>
>
> A little trick you can also use ... grab a handheld radio
> and get an adapter so
> you can plug in a headset. Then use the rubber ducky
> antenna as a "wand" to
> walk around your airplane with the engine running and
> holding the antenna near
> wiring bundles to try and determine where noise is coming
> from. Pretty crude,
> but it does work.
>
>
> Good Luck.
>
> Mark
>
>
> --- On Thu, 9/9/10, T A LEWIS <talew@bellsouth.net>
> wrote:
>
> > From: T A LEWIS <talew@bellsouth.net>
> > Subject: Yak-List: shielded tach wire
> > To: "yak list" <yak-list@matronics.com>
> > Date: Thursday, September 9, 2010, 3:30 PM
> > A LEWIS <talew@bellsouth.net>
> >
> > Hi All '
> > This question is about the wiring in my CJ- 6A .
> > I was trying to track down a noise in my radio and
> noticed
> > that the wires to the
> > front tach indicator are shielded
> > but there is no shielding on the wires to the
> reartach
> > indicator in my plane .
> > Does anyone know if this is normal ? This is a 1965
> model
> > .
> > Terry Lewis
> >
> >
> >
> > Forum -
> > FAQ,
> > - MATRONICS WEB FORUMS -
> > List Contribution Web Site -
> > -Matt
> > Dralle, List Admin.
> >
> >
> >
> >
>
>
>
>
>
> Forum -
> FAQ,
> - MATRONICS WEB FORUMS -
> List Contribution Web Site -
> -Matt
> Dralle, List Admin.
>
>
>
>
Message 7
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| Subject: | Re: shielded tach wire |
Terry;
I have two 1965 CJ's here at present. Pretty sure all of the tach. wiring
is shielded. Check tomorrow and let you know.
Walt
----- Original Message -----
From: "T A LEWIS" <talew@bellsouth.net>
Sent: Thursday, September 09, 2010 12:30 PM
Subject: Yak-List: shielded tach wire
>
> Hi All '
> This question is about the wiring in my CJ- 6A .
> I was trying to track down a noise in my radio and noticed that the wires
> to the
> front tach indicator are shielded
> but there is no shielding on the wires to the rear tach indicator in my
> plane .
> Does anyone know if this is normal ? This is a 1965 model .
> Terry Lewis
>
>
>
Message 8
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| Subject: | shielded tach wire |
The wiring diagram shows shielded wire all leads TACH gen to term strip then
to
both front and rear indicators.
Tom Elliott
CJ-6A NX63727
702-595-2680
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Walter Lannon
Sent: Thursday, September 09, 2010 7:49 PM
Subject: Re: Yak-List: shielded tach wire
Terry;
I have two 1965 CJ's here at present. Pretty sure all of the tach. wiring
is shielded. Check tomorrow and let you know.
Walt
----- Original Message -----
From: "T A LEWIS" <talew@bellsouth.net>
Sent: Thursday, September 09, 2010 12:30 PM
Subject: Yak-List: shielded tach wire
>
> Hi All '
> This question is about the wiring in my CJ- 6A .
> I was trying to track down a noise in my radio and noticed that the wires
> to the
> front tach indicator are shielded
> but there is no shielding on the wires to the rear tach indicator in my
> plane .
> Does anyone know if this is normal ? This is a 1965 model .
> Terry Lewis
>
>
>
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