Today's Message Index:
----------------------
1. 01:35 AM - Doug Sapp - are you out there (Jay McIntyre)
2. 02:13 AM - Re: Interference of GPS on Becker VHF (Hans Oortman)
3. 04:53 AM - Re: Interference of GPS on Becker VHF (A. Dennis Savarese)
4. 08:08 PM - EI's MVP 50 with the M14P (Andy Hawes)
5. 08:37 PM - APU Male Plug Availability (Dennis Von Ruden)
6. 09:48 PM - CJ gyro (keithmckinley)
Message 1
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| Subject: | Doug Sapp - are you out there |
Hi Doug.... trying vainly to reach you via e-mail, but no response.
I know you were having computer problems, but everyone else down here seems
to be able to communicate with you...
Best, Jay
New Zealand
Message 2
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| Subject: | Interference of GPS on Becker VHF |
Mark,
Thanks for all the good advise/suggestions. I'll have a look at the
shieldings. When you mentioned this, I went back in history and tried to
recall when this phenoma started to occur. It is only since the last year
and a half or so that this has become a real problem.
I don't fly a lot with gps but when I do, I need it, if you know what I
mean.
As far as I can recall it happened after a 100hrs check up (done by our
Lithuanian mechanic). At the same time, almost 2 years ago, I used the
opportunity to install an additional power connector of the Lemo type. These
Swiss connectors are the best you can find and have a lock facility build in
rather than the normal cigarette lighter connectors which are big and have
as good as no locking facility. I use those Lemo's in my company for
equipment we design/produce for cable companies. To make sure that this
power lead does not pick up RF, I installed a RF-choke just before the
connector.
When the engine is not running I hear no interference on any channel on the
Becker Radio. The GPS is connected to the YAK52's power and there are no
problems what so ever.
It is only after I start the engine that the problem occurs as long as I
have the GPS connected to the planes power. When I disconnect the power lead
(a long curled cable) from the planes power the problem is gone. The AvMap
IV does have a RF choke in its power lead.
I was under the impression that the problem was caused by the gps but it is
the combination of the set up, i.e. engine, radio, gps, which causes this
problem, not an individual piece of equipment..I think...and only when the
engine is running.
I'll check the shields of the p-leads on both mags. The tacho generator has
already been checked and the shielding of that device is OK.
Installing these filters won't hurt any way, so I'll order them, just in
case.
Thanks for your help and advise!
Hans Oortman, MBA, Ph.D.
CEO
STN BV
_____
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens Yak Pilot
Verzonden: maandag 18 mei 2009 7:53
Aan: yak-list@matronics.com
Onderwerp: Re: Yak-List: Interference of GPS on Becker VHF
Let me clarify a little here. There is a shielded P lead wire. The center
conductor is soldered to a little device that fits into the mag itself and
makes an internal connection to the mag coil. You push this into the mag P
lead hole and THEN screw on the outer shell per se.
The shield for this wire is soldered to a wire CUP that fits into the screw
on portion of the mag P lead connector AKA "The Shell". When you screw in
the P lead connector onto the mag, or OFF of the mag, it is very easy to
turn the threaded portion and ALSO turn the little piece that is soldered to
the shield. If you DO turn this little piece as you screw off the threaded
portion of the P lead connector, you will also twist the shield, and in
so-doing will cause the shield to rip off from the connector. Thus the
shield is no longer connected and there is no ground for it.
It is like MASSIVELY EASY to do this! EVERY SINGLE AIRCRAFT USING AN M-14
ENGINE I HAVE EVER SEEN HAS AT LEAST SOME DAMAGE IN THIS AREA! Every single
one. This WILL cause radio noise. Every time. (Hans, your problem is
likely something else)
The only way to avoid doing it is to "somehow" carefully hold that cup piece
that sticks out the back of the threaded portion of the connector (the NUT
per se) still as you turn the piece that screws off with your hand. I have
a special tool made to do this. You can use needle nose pliers if you are
careful. But if you ignore this advice and take off a P lead connector...
you have VERY HIGH ODDS of damaging the shield.
Rest assured, if you didn't know this, it is even money that your P lead
shields are at the very minimum "damaged" if not completely broken.
Mark
_____
From: Yak Pilot <yakplt@yahoo.com>
Sent: Monday, May 18, 2009 12:47:56 AM
Subject: Re: Yak-List: Interference of GPS on Becker VHF
One of the most common sources of interference to radios is from the P
leads. One of the most common causes for that is the loss of a ground for
the shield. The way this happens is when you unscrew the P lead connector
on the mag itself, you do not also hold the shield cup on the back of the P
lead connector still as you unscrew the P lead connector itself. The result
of this is that you end up twisting the shield right off the connector.
When you do this, the shield is no longer grounded. If the shield is not
grounded, it will radiate noise just like there was no shield there to begin
with and your radios will be filled with static and noise.
So, before you go out and install any kind of filters, ALWAYS make sure that
your P LEAD shields are indeed correctly soldered and attached to the P lead
connector itself.
If everything is ok in that department and you still have noise and decide
to try a P lead filter, install it any way you choose, but make certain that
when you are done, the P lead shield itself still has a proper ground on it,
if not at the P lead connector itself, then in some other manner as you see
fit. Do not allow the P lead wire shield "float", and keep the amount of
unshielded P lead wire as short as possible when installing a filter and
keep the length of the wire from the P lead shield to ground as short as
possible as well.
Another terrific source of noise is the Tach Gen, and if the shield on that
wire bundle breaks, the noise can be so strong it will burn out the receiver
on a Balkan 5.
Mark Bitterlich
_____
From: Roger Kemp M.D. <viperdoc@mindspring.com>
Sent: Monday, May 18, 2009 11:10:52 AM
Subject: RE: Yak-List: Interference of GPS on Becker VHF
Two magneto filters are required.
Doc
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis Savarese
Sent: Sunday, May 17, 2009 8:26 AM
Subject: Re: Yak-List: Interference of GPS on Becker VHF
Yes, we installed both filters.
Dennis
----- Original Message -----
From: Hans Oortman <mailto:pa3arw@euronet.nl>
Sent: Sunday, May 17, 2009 8:22 AM
Subject: RE: Yak-List: Interference of GPS on Becker VHF
Dennis,
Did you install the in-line filter as well as the magneto filter??
Hans
_____
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens A. Dennis Savarese
Verzonden: zondag 17 mei 2009 15:03
Aan: yak-list@matronics.com
Onderwerp: Re: Yak-List: Interference of GPS on Becker VHF
We recently had a problem with Doc's Yak 50 with noise on the Becker VHF.
First we installed a nice inline filter on the DC buss;
http://www.lonestaraviation.com/product_details.asp?Product_Name=The%20Elimi
nator. It removed much of the noise, but not all. Then we installed the
magneto filters directly on the P leads going into the magnetos.
http://www.lonestaraviation.com/product_details.asp?Product_Name=Magneto%20F
ilter. Bingo.....noise eliminated. I mounted the ground strap to the studs
on the accessory case back plate.
Dennis
----- Original Message -----
From: Hans Oortman <mailto:pa3arw@euronet.nl>
Sent: Sunday, May 17, 2009 7:42 AM
Subject: Yak-List: Interference of GPS on Becker VHF
Guys,
May be some of you on the yak net has some idea how to resolve the following
problem. Mark any suggestions??
I own a Avmap IV GPS, great tool but it is getting a nuisance in the 52.
The following happens: when on the ground GPS switched on, VHF on, engine
NOT running, no interference on VHF at all!
when on the ground GPS switched on, VHF
on, engine running (or in the air for that matter), huge interference on
VHF, S5 to 6 noise level, i.e. very difficult comms. When switching over on
battery (i.e. pulling the plug out...) the problem is as good as gone.
Has any body had this experience also and what have you done about it? I am
thinking on a LPF or a separate DC-DC convertor for the AvMap GPS.
In principle the AvMap swallows any voltage between 10 and 36v. I assume
that the 28v generator is not producing a nice DC which causes something to
start generating a noise, in my case the GPS but I do not have an
explanation for that at all....
Any help is appreciated!
Hans
RA3326K / EHSE
href="http://www.matronics.com/Navigator?Yak-List">http://www.matronhref="ht
tp://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/
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http://www.matronics.com/contribution
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target=_blank rel=nofollow>http://www.matronics.com/contribution
===========
http:========================
Message 3
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| Subject: | Re: Interference of GPS on Becker VHF |
I failed to mention in my installation description that the wire end of
the filter is a shielded wire and the shield should be soldered to the
cup on the P lead end where the old braided shield was soldered to.
Dennis
----- Original Message -----
From: Yak Pilot
To: yak-list@matronics.com
Sent: Sunday, May 17, 2009 11:47 PM
Subject: Re: Yak-List: Interference of GPS on Becker VHF
One of the most common sources of interference to radios is from the P
leads. One of the most common causes for that is the loss of a ground
for the shield. The way this happens is when you unscrew the P lead
connector on the mag itself, you do not also hold the shield cup on the
back of the P lead connector still as you unscrew the P lead connector
itself. The result of this is that you end up twisting the shield right
off the connector.
When you do this, the shield is no longer grounded. If the shield is
not grounded, it will radiate noise just like there was no shield there
to begin with and your radios will be filled with static and noise.
So, before you go out and install any kind of filters, ALWAYS make
sure that your P LEAD shields are indeed correctly soldered and attached
to the P lead connector itself.
If everything is ok in that department and you still have noise and
decide to try a P lead filter, install it any way you choose, but make
certain that when you are done, the P lead shield itself still has a
proper ground on it, if not at the P lead connector itself, then in some
other manner as you see fit. Do not allow the P lead wire shield
"float", and keep the amount of unshielded P lead wire as short as
possible when installing a filter and keep the length of the wire from
the P lead shield to ground as short as possible as well.
Another terrific source of noise is the Tach Gen, and if the shield on
that wire bundle breaks, the noise can be so strong it will burn out the
receiver on a Balkan 5.
Mark Bitterlich
-------------------------------------------------------------------------
-----
From: Roger Kemp M.D. <viperdoc@mindspring.com>
To: yak-list@matronics.com
Sent: Monday, May 18, 2009 11:10:52 AM
Subject: RE: Yak-List: Interference of GPS on Becker VHF
Two magneto filters are required.
Doc
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of A. Dennis
Savarese
Sent: Sunday, May 17, 2009 8:26 AM
To: yak-list@matronics.com
Subject: Re: Yak-List: Interference of GPS on Becker VHF
Yes, we installed both filters.
Dennis
----- Original Message -----
From: Hans Oortman
To: yak-list@matronics.com
Sent: Sunday, May 17, 2009 8:22 AM
Subject: RE: Yak-List: Interference of GPS on Becker VHF
Dennis,
Did you install the in-line filter as well as the magneto filter??
Hans
-------------------------------------------------------------------------
---
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens A. Dennis Savarese
Verzonden: zondag 17 mei 2009 15:03
Aan: yak-list@matronics.com
Onderwerp: Re: Yak-List: Interference of GPS on Becker VHF
We recently had a problem with Doc's Yak 50 with noise on the Becker
VHF. First we installed a nice inline filter on the DC buss;
http://www.lonestaraviation.com/product_details.asp?Product_Name=The%20
Eliminator. It removed much of the noise, but not all. Then we
installed the magneto filters directly on the P leads going into the
magnetos.
http://www.lonestaraviation.com/product_details.asp?Product_Name=Magnet
o%20Filter. Bingo.....noise eliminated. I mounted the ground strap to
the studs on the accessory case back plate.
Dennis
----- Original Message -----
From: Hans Oortman
To: yak-list@matronics.com
Sent: Sunday, May 17, 2009 7:42 AM
Subject: Yak-List: Interference of GPS on Becker VHF
Guys,
May be some of you on the yak net has some idea how to resolve the
following problem. Mark any suggestions??
I own a Avmap IV GPS, great tool but it is getting a nuisance in
the 52.
The following happens: when on the ground GPS switched on, VHF on,
engine NOT running, no interference on VHF at all!
when on the ground GPS switched
on, VHF on, engine running (or in the air for that matter), huge
interference on VHF, S5 to 6 noise level, i.e. very difficult comms.
When switching over on battery (i.e. pulling the plug out...) the
problem is as good as gone.
Has any body had this experience also and what have you done about
it? I am thinking on a LPF or a separate DC-DC convertor for the AvMap
GPS.
In principle the AvMap swallows any voltage between 10 and 36v. I
assume that the 28v generator is not producing a nice DC which causes
something to start generating a noise, in my case the GPS but I do not
have an explanation for that at all....
Any help is appreciated!
Hans
RA3326K / EHSE
href="http://www.matronics.com/Navigator?Yak-List">http://www.matronhre
f="http://forums.matronics.com">http://forums.matronics.comhref="http
://www.matronics.com/contribution">http://www.matronics.com/c
href="http://www.matronics.com/Navigator?Yak-List">http://www.matronhre
f="http://forums.matronics.com">http://forums.matronics.comhref="http
://www.matronics.com/contribution">http://www.matronics.com/c
href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics
.com/Navigator?Yak-Listhref="http://forums.matronics.com">http://forums
.matronics.comhref="http://www.matronics.com/contribution">http://www.m
atronics.com/c
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p://www.matronics.com/contribution
http://www.matronics.com/Navigator?Yak-Lisnics.com/contribution"
target=_blank rel=nofollow>http://www.matronics.com/contribution
===========
Message 4
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| Subject: | EI's MVP 50 with the M14P |
Hello from Nashville,
Has anyone installed or is anyone using the glass panel EMS MVP 50 from EI?
Any comments on the overall installation process or general user experience
is much appreciated.
Thank you,
Andy Hawes
Message 5
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| Subject: | APU Male Plug Availability |
Does anyone know where I can obtain the male plug that connects to the
APU/electrical power receptacle located on the CJ6A fuselage?
Thanks
Dennis Von Ruden
General Equipment Company
507.451.5510 (P)
507.451.5511 (F)
dvonruden@generalequip.com
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Anyone have a working gyro they are interested in selling. contact me off line
Keith
--------
Keith McKinley
700 HS
KFIT
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=244592#244592
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