Today's Message Index:
----------------------
1. 12:46 AM - Re: Interference of GPS on Becker VHF (Hans Oortman)
2. 04:18 AM - Re: yak 52 fuel instrument (A. Dennis Savarese)
3. 04:55 AM - Re: yak 52 fuel instrument (A. Dennis Savarese)
4. 07:11 AM - Re: White Paper on Russian Generator System (keithmckinley)
5. 08:07 AM - Re: yak 52 fuel instrument (Stephen Morrey)
6. 10:42 AM - Still looking for a snot valve - help (Yak 55M)
7. 10:43 AM - Re: yak 52 fuel instrument (Yak Pilot)
8. 11:10 AM - Re: Still looking for a snot valve - help (jlpartington@att.net)
9. 11:30 AM - Re: yak 52 fuel instrument (A. Dennis Savarese)
10. 11:39 AM - Re: Still looking for a snot valve - help (A. Dennis Savarese)
11. 08:04 PM - Looking for a set of jacks for Nanchang (skidmk)
Message 1
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| Subject: | Interference of GPS on Becker VHF |
Mark,
Thanks for the suggestions. I am going to do those in the next few days. We
have a few bank holidays any way so, time to fly.
I ordered the filters, just in case, it certainly won't hurt to install
these and at the same time I can check the shielding at the P-lead.
I'll keep you updated!
Hans
Tel: +31 653 286022
_____
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens Yak Pilot
Verzonden: donderdag 21 mei 2009 5:37
Aan: yak-list@matronics.com
Onderwerp: Re: Yak-List: Interference of GPS on Becker VHF
Hans, this is a much better explanation. Try this. Next time you go fly,
leave the power lead connected for the GPS, but if possible unplug the GPS
itself while leaving the power cord connected to the aircraft. Hopefully
there is a disconnect plug at the GPS itself that would allow you to keep
the GPS power cord connected with the actual GPS removed. Also tell me what
happens if you TURN THE GPS OFF in flight! Does this impact the noise in
the radio with the engine running? If NOT, then for some reason your GPS
power cable is either radiating noise "somehow" or is picking noise up and
putting it back into wiring where it should not be.
While unusual, this kind of thing is not unknown.
I suggest replacing your GPS power wire with dual conductor SHIELDED wire
and make sure the shield is connected to ground at the power connector side
only.
Also, reducing RF noise from the Mags by using filters is never a bad idea.
Before you do that, PLEASE check the P lead shields right at the MAG P LEAD
CONNECTOR and make sure they are not twisted off! That happens ALL the
time, and you need to physically check this yourself. When you unscrew the
P lead connector on the mag, be SURE to hold the center of it still as you
rotate the knurled knob or you will twist the shield right off.
Best Regards,
Mark Bitterlich
_____
From: Hans Oortman <pa3arw@euronet.nl>
Sent: Monday, May 18, 2009 5:12:12 AM
Subject: RE: Yak-List: 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
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| Subject: | Re: yak 52 fuel instrument |
Steve,
The problem you are experiencing with your fuel instrument is a typical
internal failure of one of the circuit boards inside the fuel
instrument. Unfortunately there are no schematics for the unit, even at
Termikas in Lithuania that repair them. In fact, the only company that
I know of that repairs the Yak 52 fuel instrument is Termikas. They
have an electronics tech that has figured them out. Although your
airplane would be down for about 3 weeks due to shipment and repair,
most likely Termikas can repair the instrument. Let me forewarn you, it
is somewhat expensive. Recently we had one repaired and the cost was
400 EUROS, plus shipping.
If you would like for me to arrange for Termikas to repair your fuel
instrument, please contact me off-list.
Dennis
p.s. I wish our expert electronics guy on this list, Mark Bitterlich,
could dig into one (which I can provide) and get into repairing them.
:-) hint, hint!
----- Original Message -----
From: Stephen Morrey
To: yak-list@matronics.com
Sent: Wednesday, May 20, 2009 8:44 PM
Subject: Yak-List: yak 52 fuel instrument
1.Does anyone know where I can get the schematic for the 52 fuel
instrument. My left wing light panel seems to be working fine. The
right wing panel jumps from 60 L to 40L and then remains at 40L and on
very low fuel jumps back to 60L. 2. Does any one know where I can
purchase a functioning unit or perhaps trade in/ purchase for a
functioning unit.
3. Does anyone have any suggestions on what might be the problem with
mine. Thanks Steve Morrey MI USA
Message 3
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| Subject: | Re: yak 52 fuel instrument |
Steve,
One thing you might try is swapping the connectors on the back of the
instrument to see if the problem follows the swapped connectors or not.
If it does follow the connector swap, it is a fuel sender and not the
instrument. If the problem remains on the same side of the fuel
instrument after swapping the connectors, it's definitely the
instrument.
Dennis
----- Original Message -----
From: Stephen Morrey
To: yak-list@matronics.com
Sent: Wednesday, May 20, 2009 8:44 PM
Subject: Yak-List: yak 52 fuel instrument
1.Does anyone know where I can get the schematic for the 52 fuel
instrument. My left wing light panel seems to be working fine. The
right wing panel jumps from 60 L to 40L and then remains at 40L and on
very low fuel jumps back to 60L. 2. Does any one know where I can
purchase a functioning unit or perhaps trade in/ purchase for a
functioning unit.
3. Does anyone have any suggestions on what might be the problem with
mine. Thanks Steve Morrey MI USA
Message 4
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| Subject: | Re: White Paper on Russian Generator System |
How about "Tron" short for, well you know...electron.
Keith
[quote="ByronMFox(at)aol.com"]In a message dated 2/14/2007 9:29:13 PM Pacific Standard
Time, KingCJ6@aol.com writes:
> Rob - if not previously bestowed upon you, a call sign of "Sparky" is clearly
befitting your excellent demonstrated expertise!
>
Nope,Dave. Sorry, "Sparky" already belongs to Doug Sapp's lovely daughter. I'll
go for "Sparks", though. ...Blitz, Chairman
AHSACSC
> [b]
--------
Keith McKinley
700 HS
KFIT
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=244886#244886
Message 5
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| Subject: | Re: yak 52 fuel instrument |
Dennis I tried the swap and it does not seem to follow the swap. I wonder
if you know where I can find a non functioning unit that we could send to
Termikas . That way I would at least be able o read one side using my
current instrument until I can get a recon unit. I also wonder if Temikas
has any surplus units that are in working order that I could order and then
return mine. I dont know how to communicate with these guys. Can you give
me a contact or otherwise assist me. steve
On Thu, May 21, 2009 at 7:54 AM, A. Dennis Savarese <
dsavarese0812@bellsouth.net> wrote:
> Steve,
> One thing you might try is swapping the connectors on the back of the
> instrument to see if the problem follows the swapped connectors or not. If
> it does follow the connector swap, it is a fuel sender and not the
> instrument. If the problem remains on the same side of the fuel instrument
> after swapping the connectors, it's definitely the instrument.
> Dennis
>
>
> ----- Original Message -----
> *From:* Stephen Morrey <stephenmorrey@gmail.com>
> *To:* yak-list@matronics.com
> *Sent:* Wednesday, May 20, 2009 8:44 PM
> *Subject:* Yak-List: yak 52 fuel instrument
>
> 1.Does anyone know where I can get the schematic for the 52 fuel
> instrument. My left wing light panel seems to be working fine. The right
> wing panel jumps from 60 L to 40L and then remains at 40L and on very low
> fuel jumps back to 60L. 2. Does any one know where I can purchase a
> functioning unit or perhaps trade in/ purchase for a functioning unit.
> 3. Does anyone have any suggestions on what might be the problem with
> mine. Thanks Steve Morrey MI USA
>
> *
>
> href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c*
>
> *
>
> *
>
>
Message 6
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| Subject: | Still looking for a snot valve - help |
Hi,
I have finally secured almost everything I need to add a compressor to my
Yak55M, but I am missing one more item - a snot valve. It seems this little
item is difficult to get. Any lines on where I can get a snot valve would
be greatly appreciated.
Thanks in advance,
Anthony.
BTW, thanks for all of the advice in finding the sheer coupling and gauge,
this list made it happen.
Message 7
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| Subject: | Re: yak 52 fuel instrument |
This is an area that I have been lucky enough to avoid since mine has not f
ailed yet.- But you're right Dennis, it would make sense to have someone
that understands these things.- I currently have NO IDEA how they work, o
r even the theory involved on how they do it.- I am guessing it might be
a capacitive fuel quantity system only based on how it tends to work. =0A
=0AIf you can send me a probe that works and one of the units with some jus
t basic schematics of how they get wired to each other so that I can put it
together outside of the aircraft and make it work,- I think there is a g
ood chance I may be able to figure it out for you.- =0A=0AMark=0A=0A-
=0A=0A=0A=0A________________________________=0AFrom: A. Dennis Savarese <ds
avarese0812@bellsouth.net>=0ATo: yak-list@matronics.com=0ASent: Thursday, M
ay 21, 2009 7:14:59 AM=0ASubject: Re: Yak-List: yak 52 fuel instrument=0A
=0A=0ASteve,=0AThe problem you are experiencing with your fuel instrument i
s a typical internal failure of one of the circuit boards inside the fuel i
nstrument.- Unfortunately there are no schematics for the unit, even at T
ermikas in Lithuania that repair them.- In fact, the only company that I
know of that repairs the Yak 52 fuel instrument is Termikas.- They have a
n electronics tech that has figured them out.- Although your airplane wou
ld be down for about 3 weeks due to shipment and repair, most likely Termik
as can repair the instrument.- Let me forewarn you, it is somewhat expens
ive.- Recently we had one repaired and the cost was 400 EUROS, plus shipp
ing.=0A-=0AIf you would like for me to arrange for Termikas to repair you
r fuel instrument, please contact me off-list.=0ADennis=0A-=0Ap.s.- I w
ish our expert electronics guy on this list, Mark Bitterlich, could dig int
o one (which I can provide) and get into repairing them.- :-)- hint, hi
nt!=0A-=0A-=0A----- Original Message ----- =0AFrom: Stephen Morrey =0AT
o: yak-list@matronics.com =0ASent: Wednesday, May 20, 2009 8:44 PM=0ASubjec
t: Yak-List: yak 52 fuel instrument=0A=0A1.Does anyone know where I can get
the schematic for the 52 fuel instrument.- My left wing light panel seem
s to be working fine.- The right wing panel jumps from 60 L to 40L and th
en remains at 40L and on very low fuel jumps back to 60L.-----
-2. Does any one know where I can purchase a functioning unit or perhaps
trade in/ purchase for a functioning unit.-=0A3.-Does anyone have any s
uggestions on what might be the problem with mine.- -Thanks Steve Morre
y MI USA =0A=0A=0Ahref="http://www.matronics.com/Navigator?Yak-List">http
://www.matronics.com/Navigator?Yak-Listhref="http://forums.matronics.com"
>http://forums.matronics.com=0Ahref="http://www.matronics.com/contributio
=
Message 8
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| Subject: | Re: Still looking for a snot valve - help |
Message 9
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| Subject: | Re: yak 52 fuel instrument |
Mark,
Are you sure you want to do this? The reason for the question is if you
figure out how it works etc., which I'm confident you will, you'll end
up being the "repair facility" for Yak 52 fuel instruments. And you're
right. The system is a capacitive system.
I can ship you a spare fuel instrument and a fuel sender and cut and
paste the pages from the Yak 52 wiring diagram. But I must have these
back in working order. They are very valuable, needless to say.
Email me your ship-to address off-list and I will get them out to you
next week.
Dennis
----- Original Message -----
From: Yak Pilot
To: yak-list@matronics.com
Sent: Thursday, May 21, 2009 12:39 PM
Subject: Re: Yak-List: yak 52 fuel instrument
This is an area that I have been lucky enough to avoid since mine has
not failed yet. But you're right Dennis, it would make sense to have
someone that understands these things. I currently have NO IDEA how
they work, or even the theory involved on how they do it. I am guessing
it might be a capacitive fuel quantity system only based on how it tends
to work.
If you can send me a probe that works and one of the units with some
just basic schematics of how they get wired to each other so that I can
put it together outside of the aircraft and make it work, I think there
is a good chance I may be able to figure it out for you.
Mark
-------------------------------------------------------------------------
-----
From: A. Dennis Savarese <dsavarese0812@bellsouth.net>
To: yak-list@matronics.com
Sent: Thursday, May 21, 2009 7:14:59 AM
Subject: Re: Yak-List: yak 52 fuel instrument
Steve,
The problem you are experiencing with your fuel instrument is a
typical internal failure of one of the circuit boards inside the fuel
instrument. Unfortunately there are no schematics for the unit, even at
Termikas in Lithuania that repair them. In fact, the only company that
I know of that repairs the Yak 52 fuel instrument is Termikas. They
have an electronics tech that has figured them out. Although your
airplane would be down for about 3 weeks due to shipment and repair,
most likely Termikas can repair the instrument. Let me forewarn you, it
is somewhat expensive. Recently we had one repaired and the cost was
400 EUROS, plus shipping.
If you would like for me to arrange for Termikas to repair your fuel
instrument, please contact me off-list.
Dennis
p.s. I wish our expert electronics guy on this list, Mark Bitterlich,
could dig into one (which I can provide) and get into repairing them.
:-) hint, hint!
----- Original Message -----
From: Stephen Morrey
To: yak-list@matronics.com
Sent: Wednesday, May 20, 2009 8:44 PM
Subject: Yak-List: yak 52 fuel instrument
1.Does anyone know where I can get the schematic for the 52 fuel
instrument. My left wing light panel seems to be working fine. The
right wing panel jumps from 60 L to 40L and then remains at 40L and on
very low fuel jumps back to 60L. 2. Does any one know where I can
purchase a functioning unit or perhaps trade in/ purchase for a
functioning unit.
3. Does anyone have any suggestions on what might be the problem
with mine. Thanks Steve Morrey MI USA
href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics
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| Subject: | Re: Still looking for a snot valve - help |
Doug Sapp should have the snot valve that's used on the CJ. It's almost
identical to the 52. Except that the in/out male fittings are a
different size than on the 52 snot valve. But that shouldn't make a
difference to you since you're building a new system. I'm sure Doug has
the female B-Nut fittings to mate with the snot valve. Doug can also
make you a high pressure flexible line from the compressor output check
valve banjo fitting to the snot valve. Ask him about that.
Dennis
----- Original Message -----
From: Yak 55M
To: yak-list@matronics.com
Sent: Thursday, May 21, 2009 12:34 PM
Subject: Yak-List: Still looking for a snot valve - help
Hi,
I have finally secured almost everything I need to add a compressor to
my Yak55M, but I am missing one more item - a snot valve. It seems this
little item is difficult to get. Any lines on where I can get a snot
valve would be greatly appreciated.
Thanks in advance,
Anthony.
BTW, thanks for all of the advice in finding the sheer coupling and
gauge, this list made it happen.
Message 11
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| Subject: | Looking for a set of jacks for Nanchang |
need complete set (4)
reply to
skidmk@gmail.com
--------
Mike "Skidmk" Bourget
Ottawa, Ontario
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=244939#244939
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