Today's Message Index:
----------------------
1. 01:50 AM - Re: RF interference (mikspin)
2. 01:50 AM - Re: RF interference (mikspin)
3. 04:54 AM - Re: Yak 18T parts (A Dennis Savarese)
4. 04:54 AM - Re: Chinese L-7 (Warren Hill)
5. 07:37 AM - Re: Chinese L-7Chinese L-7 (Joseph Colquitt)
6. 08:03 AM - Re: Chinese L-7Chinese L-7 (Eric Wobschall)
7. 09:22 AM - Re: RF interference (Yak Pilot)
8. 01:47 PM - Yak 130Chinese L-7 (Roger Baker)
9. 06:07 PM - Re: RF interference (Scott Poehlmann)
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| Subject: | Re: RF interference |
Hans,
Where are you in the Netherlands? I routinely overnight in Amsterdam.
(Sorry to go off topic here guys)
Mike Hastings
Yak 55M
(Oversee several Yak 52's)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323634#323634
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| Subject: | Re: RF interference |
Scott,
Did you get those diagrams I emailed you a while back?
Mike
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323635#323635
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| Subject: | Re: Yak 18T parts |
Oh! I misunderstood.
Dennis
On 12/16/2010 6:04 PM, Anthony Hudacek wrote:
> Thanks Dennis,
> But it is the actual cover plate that I am after.
> Ant.
>
>
> *
>
> *
Message 4
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Perhaps it's just the perspective of the photo, but it looks like it
would have a very forward CG with only one pilot.
Warren Hill
N464TW
On Dec 16, 2010, at 7:41 AM, George Coy wrote:
> The new Chinese L-7 prototype is getting ready to fly. It is a Chinese
version of the Yak-152. It has a Romanian M`14P and an MT propeller.
> <L7 airplane.jpg>
Message 5
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| Subject: | Re: Chinese L-7Chinese L-7 |
The Yak 130 will be faster, and it too has nice lines.
http://www.yak.ru/ENG/PROD/new_130.php
Joe Colquitt
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| Subject: | Re: Chinese L-7Chinese L-7 |
And low operating costs.
On Dec 17, 2010, at 10:38 AM, Joseph Colquitt wrote:
> The Yak 130 will be faster, and it too has nice lines.
>
> http://www.yak.ru/ENG/PROD/new_130.php
>
> Joe Colquitt
>
>
Message 7
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Do the following:
Remove the plug from the Tach Gen and tie it back. Run the aircraft. Does the
noise go away? Then it is indeed your Tach Gen and it is most likely shielding
at the Tach Generator plug itself. Be careful taking this plug apart as it
is common for the soldering on these wires to break.
If the noise does not go away, fly the airplane. Over the airport come to complete
idle and then shut the mags off. Both mags, turn them off.
You're now a glider.
Did the noise go away? If it did, then you have a MAG noise problem. The mag
noise filters will help, but before you go to that effort, look at the P leak
plugs that go into the side of the mags. It is very common for people to twist
these plugs off during some kind of maint. action and in the process twist the
shield right off the plug as well. If the P Lead is unshielded you will have
one huge amount of noise.
If the noise is still there even when you have performed these steps (whcih is
highly unlikely) then you've got some other device radiating energy in the aircraft.
Start turning everything that you can off to try and identify it.
Suggestions have been made to see if it is coming in via the antenna or the power
wiring. I have posted these suggestions before, but it is something you do
at the end of troubleshooting and not the beginning. It is much easier to identify
the noise source and eliminate it where it is coming from. If you can't
identify the noise and you are lucky enough to have it coming in via the power
wires (again this is rare), a choke on the input power wiring can help eliminate
the noise. This can be as simple as a snap on torroid, or an expensive
(purchased) filter, that is usually some sort of "Pi L brute force" filter consisting
of two caps and an inductor. Usually, snap on torroids are just as effective
and much cheaper. Again though, noise coming in via the power wiring
is rare. It usually is coming in via the antenna, and that means you MUST eliminate
the noise at it's source.
The tests described above will usually nail the problem in short order.
Mark Bitterlich
p.s. The reason I recommend shutting the mags off at idle in flight versus doing
it on the ground is because the engine keeps wind-milling even with the mags
off, and you can leave them off much longer while you are listening for radio
noise and seeing if it goes away. Shutting the engine off with the mags and
the engine windmilling with it at idle will not hurt anything, although the engine
will cool off really fast, so when you turn the mags back on and the engine
once again is actually "running", don't just cob the power to 100%. Bring
it in slowly. Common sense applies.
--- On Thu, 12/16/10, Roger Kemp M.D. <viperdoc@mindspring.com> wrote:
> From: Roger Kemp M.D. <viperdoc@mindspring.com>
> Subject: RE: Yak-List: RF interference
> To: yak-list@matronics.com
> Date: Thursday, December 16, 2010, 1:35 PM
> "Roger Kemp M.D." <viperdoc@mindspring.com>
>
> Check the shielding on your Tac Generator. That is the most
> likely source
> for RPM related noise.
> Doc
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com]
> On Behalf Of Scott Poehlmann
> Sent: Thursday, December 16, 2010 5:07 AM
> To: yak-list@matronics.com
> Subject: Yak-List: RF interference
>
>
> Hi All,
>
> I am aware this has been discussed before, but as the
> problem now
> effects my own airplane, I have am a bit more attentive...
>
> I have a Yak 55M with an auto-plug conversion. The
> conversion has been
> in place for about 3 years now (roughly 400 hours). I am
> now getting RF
> interference picked up in the Briz radio from the mags/plug
> wires. At
> least I assume that is the source, as it is RPM dependent.
> It has been
> present since installation, but has been gradually getting
> worse over
> the past year or so. I assume that there is a shielding
> issue either at
> the mag connection or along the wires somewhere. My
> question to you is
> where should I start to look at trouble shooting this
> issue, and how do
> I go about fixing it (shy of completely replacing the plug
> wires, which
> I'd prefer not to do... But will do if need be...)?
>
> Any thoughts you might have on the matter would be
> appreciated.
>
> Thanks,
>
> Scott Poehlmann
> Yak 55M N155YK
>
>
>
>
>
>
>
> Lists This Month --
> Some AWESOME FREE Gifts!)
> Raiser. Click on
> out more about
> Gifts provided
> www.aeroelectric.com
> www.buildersbooks.com
> www.homebuilthelp.com
> -Matt
> Dralle, List Admin.
> Forum -
> FAQ,
> - MATRONICS WEB FORUMS -
>
>
>
>
Message 8
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| Subject: | Yak 130Chinese L-7 |
Here's a photo of the Yak 130 that I took at Gromov Flight Test Center
at Zhukovsky near Moscow in 2007. I put it on my "Win the Lottery" list
right away.
Roger Baker
PS I think there's some obscure method for putting photos up on the List
site. Don't know what it is....so I'm just trying it as I would sending
to a regular recipient.
On Dec 17, 2010, at 7:54 AM, Eric Wobschall wrote:
> And low operating costs.
>
> On Dec 17, 2010, at 10:38 AM, Joseph Colquitt wrote:
>
>> The Yak 130 will be faster, and it too has nice lines.
>>
>> http://www.yak.ru/ENG/PROD/new_130.php
>>
>> Joe Colquitt
>>
>>
>> style="color: blue; text-decoration: underline;
">www.aeroelectric.com
>> href="http://www.buildersbooks.com" style="color: blue;
text-decoration: underline; ">www.buildersbooks.com
>> style="color: blue; text-decoration: underline;
">www.homebuilthelp.com
>> style="color: blue; text-decoration: underline;
">http://www.matronics.com/contribution
>> style="color: blue; text-decoration: underline;
">http://www.matronics.com/Navigator?Yak-List
>> blue; text-decoration: underline; ">http://forums.matronics.com
>
>
>
Roger E. Baker, Managing Director
Panadero Energy Components, LLC
dba PEC AirAssist
760/809-5506
760/730-9244
760/454-4595 fax
f4ffm2@roadrunner.com
Message 9
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| Subject: | Re: RF interference |
Thanks Mark,
I knew that you would have a great, step by step method.
Went out to the hangar today: looks like the P-leads are the
culprit--BOTH have the shielding detached from the connector and about 1
cm of unshielded lead "hanging in the breeze". I'll spend some time
tomorrow AM soldering the shielding to the connector (it appears that
this has been done before and that the solder joints have failed...),
and will advise if this doesn't fix the problem.
Now for the next question: any ideas where to find a cover for the tach
generator drive? I am running a Horizon digital tach (which takes its
data from the mag--in fact it is wired into the back of the mag
switch...), and I have no tach generator, just a big open fitting with a
drive (and seal) at the bottom... Threaded on the outside, of course.
Thanks again, and to everyone else who provided information. This list
is a tremendous asset to the continued operation of these airplanes.
Scott
On 12-17-2010 10:15, Yak Pilot wrote:
> --> Yak-List message posted by: Yak Pilot<yakplt@yahoo.com>
>
> Do the following:
>
> Remove the plug from the Tach Gen and tie it back. Run the aircraft. Does the
noise go away? Then it is indeed your Tach Gen and it is most likely shielding
at the Tach Generator plug itself. Be careful taking this plug apart as it
is common for the soldering on these wires to break.
>
> If the noise does not go away, fly the airplane. Over the airport come to complete
idle and then shut the mags off. Both mags, turn them off.
>
> You're now a glider.
>
> Did the noise go away? If it did, then you have a MAG noise problem. The mag
noise filters will help, but before you go to that effort, look at the P leak
plugs that go into the side of the mags. It is very common for people to twist
these plugs off during some kind of maint. action and in the process twist
the shield right off the plug as well. If the P Lead is unshielded you will
have one huge amount of noise.
>
> If the noise is still there even when you have performed these steps (whcih is
highly unlikely) then you've got some other device radiating energy in the aircraft.
Start turning everything that you can off to try and identify it.
>
> Suggestions have been made to see if it is coming in via the antenna or the power
wiring. I have posted these suggestions before, but it is something you
do at the end of troubleshooting and not the beginning. It is much easier to
identify the noise source and eliminate it where it is coming from. If you can't
identify the noise and you are lucky enough to have it coming in via the power
wires (again this is rare), a choke on the input power wiring can help eliminate
the noise. This can be as simple as a snap on torroid, or an expensive
(purchased) filter, that is usually some sort of "Pi L brute force" filter consisting
of two caps and an inductor. Usually, snap on torroids are just as
effective and much cheaper. Again though, noise coming in via the power wiring
is rare. It usually is coming in via the antenna, and that means you MUST eliminate
the noise at it's source.
>
> The tests described above will usually nail the problem in short order.
>
> Mark Bitterlich
>
> p.s. The reason I recommend shutting the mags off at idle in flight versus doing
it on the ground is because the engine keeps wind-milling even with the mags
off, and you can leave them off much longer while you are listening for radio
noise and seeing if it goes away. Shutting the engine off with the mags and
the engine windmilling with it at idle will not hurt anything, although the
engine will cool off really fast, so when you turn the mags back on and the engine
once again is actually "running", don't just cob the power to 100%. Bring
it in slowly. Common sense applies.
>
> --- On Thu, 12/16/10, Roger Kemp M.D.<viperdoc@mindspring.com> wrote:
>
>> From: Roger Kemp M.D.<viperdoc@mindspring.com>
>> Subject: RE: Yak-List: RF interference
>> To: yak-list@matronics.com
>> Date: Thursday, December 16, 2010, 1:35 PM
>> --> Yak-List message posted by:
>> "Roger Kemp M.D."<viperdoc@mindspring.com>
>>
>> Check the shielding on your Tac Generator. That is the most
>> likely source
>> for RPM related noise.
>> Doc
>>
>> -----Original Message-----
>> From: owner-yak-list-server@matronics.com
>> [mailto:owner-yak-list-server@matronics.com]
>> On Behalf Of Scott Poehlmann
>> Sent: Thursday, December 16, 2010 5:07 AM
>> To: yak-list@matronics.com
>> Subject: Yak-List: RF interference
>>
>> --> Yak-List message posted by: Scott Poehlmann<scott-p@texas.net>
>>
>> Hi All,
>>
>> I am aware this has been discussed before, but as the
>> problem now
>> effects my own airplane, I have am a bit more attentive...
>>
>> I have a Yak 55M with an auto-plug conversion. The
>> conversion has been
>> in place for about 3 years now (roughly 400 hours). I am
>> now getting RF
>> interference picked up in the Briz radio from the mags/plug
>> wires. At
>> least I assume that is the source, as it is RPM dependent.
>> It has been
>> present since installation, but has been gradually getting
>> worse over
>> the past year or so. I assume that there is a shielding
>> issue either at
>> the mag connection or along the wires somewhere. My
>> question to you is
>> where should I start to look at trouble shooting this
>> issue, and how do
>> I go about fixing it (shy of completely replacing the plug
>> wires, which
>> I'd prefer not to do... But will do if need be...)?
>>
>> Any thoughts you might have on the matter would be
>> appreciated.
>>
>> Thanks,
>>
>> Scott Poehlmann
>> Yak 55M N155YK
>>
>>
>>
>>
>>
>>
>>
>> Lists This Month --
>> Some AWESOME FREE Gifts!)
>> Raiser. Click on
>> out more about
>> Gifts provided
>> www.aeroelectric.com
>> www.buildersbooks.com
>> www.homebuilthelp.com
>> -Matt
>> Dralle, List Admin.
>> Forum -
>> FAQ,
>> - MATRONICS WEB FORUMS -
>>
>>
>>
>>
>
>
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