Today's Message Index:
----------------------
1. 01:44 AM - Re: Re: Interference Becker 4201 radio (Jan Mevis)
2. 06:42 AM - Re: Re: Inteference Becker 4201 Radio (Hans Oortman)
3. 06:51 AM - Re: Parachutes (N642K)
4. 06:52 AM - Re: Re: Inteference Becker 4201 Radio (A. Dennis Savarese)
5. 06:58 AM - Re: Parachutes (N642K)
6. 06:59 AM - Idling problem... (Zjopa)
7. 07:11 AM - Re: Re: Inteference Becker 4201 Radio (Hans Oortman)
8. 08:10 AM - Re: Re: Parachutes (jblake207@COMCAST.NET)
9. 09:12 AM - Re: Idling problem... (Walter Lannon)
10. 09:37 AM - Re: Becker radio noise (Craig Winkelmann)
11. 09:41 AM - Re: Idling problem... (Tom Elliott)
12. 09:42 AM - Re: Inteference Becker 4201 Radio (Craig Winkelmann)
13. 09:49 AM - Re: Inteference Becker 4201 Radio (Craig Winkelmann)
14. 10:12 AM - Re: Re: Parachutes (John Cox)
15. 10:24 AM - Re: Idling problem... (Zjopa)
16. 10:55 AM - Re: Re: Inteference Becker 4201 Radio (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
17. 11:34 AM - Re: Interference Becker 4201 radio (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
18. 12:04 PM - Re: Re: Inteference Becker 4201 Radio (A. Dennis Savarese)
19. 12:18 PM - Re: Idling problem... (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
20. 12:56 PM - Re: Interference Becker 4201 radio (Craig Winkelmann)
Message 1
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| Subject: | Re: Interference Becker 4201 radio |
I have a Becker 4201 radio in my Yak 50 (with B&C alternator). The radio
works perfectly well, but I've also changed the audio wiring completely.
I've used RG400 antenna cable and have a Comant antenna instead of the
original Russian antenna (and a Dave Clark headset).
IMHO, but I'm not an electronics expert, if you use western radio's, then
better change it ALL to avoid impedance problems etc.
Before I had the American ignition wiring harness (Dennis' set) on my M14P
and I had more noise on my Russian BRIZ radio. That's why I installed the
Becker, and all the noise problems were solved. Since a year I have a new
engine, and did not change the wiring harness yet. So that is still the
original Russian. And the Becker 4201 still works very fine. So I'm inclined
to think that in my case the problem was cable-related.
Jan
YK50 RA2005K
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Craig Winkelmann
Sent: maandag 6 juli 2009 2:08
Subject: Yak-List: Re: Interference Becker 4201 radio
I too have a Becker in my CJ that is stone quite on the ground (at idle) and
unusable in flight due to noise. The Garmin SL-30 in the plane functions
perfectly. My Becker is fed by a King KR-22 24 to 12 VDC converter and I
have converted from the stock generator to the B&C alternator.
I have yet to make some tests to determine where the noise is coming from
(power or antenna). I will get to that in a week or so (other problems to
solve first), hence, I am very interested in this discussion.
I wonder if the Becker was originally designed for gliders so there is no
filtration on the power as it would be operating off a battery. This could
be one reason why this radio seems to be line noise sensitive. I am also
going to try and call Becker USA to inquire.
Craig W.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251644#251644
Message 2
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| Subject: | Re: Inteference Becker 4201 Radio |
Frank,
I use the PS-Engineering PM1000, which is functioning great on VOX.
I have never had the problem of interference before. When I ferried my Yak
from Lithuania to Holland I did not have this problem.
During the course of time it simply happened that I could not use my GPS
anymore because it was causing interference on my 4201 which did not happen
before. I have never been able to explain this. I checked all the screening,
all are OK.
I have checked the P-leads (including the screening) on the mags, installed
Lonestar filters in these p-leads but they don't seem to make any
difference. I also have the capacitor and the psu filter but I did not
install these yet.
After this the remaining item to change is the dc-dc converter but I have
not yet found this unit yet in my Yak52.
Reading from the other mails it seems to be necessary to make sure that the
power to the 4201 is clean as a whistle. I can make and design such a filter
but before I want to do that I want to make sure that this solves the
problem of interference.
What are you guys using as a psu (i.e. what dc-dc converter) for the supply
of power to the 4201??
Any suggestion is welcomed!
Hans Oortman
RS3326K
_____
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens Frank Stelwagon
Verzonden: maandag 6 juli 2009 8:49
Aan: yak-list@matronics.com
Onderwerp: Yak-List: Re: Inteference Becker 4201 Radio
The point that the Becker was originally used in Gliders is probably the
reason that it is still a 12 volt radio, as 12 volt gell cells are pretty
common. I have installed them in a couple of CJ's and they have been fine.
We have always used a Sigtronics SP400N intercom and have excellent results.
Use push to talk intercom not VOX. I have seen other CJs with other radios
that are noisy. One thing that has been mentioned is proper shielding of
the "P" leads, a lot of them are in bad shape, also a ground wire from
engine case to structure is a good idea.
Frank
CJ6-A N23021
Message 3
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As a skydiver with 2000+ jumps, I would tell you not to buy a canopy that is more
than acouple of years old. The sun erodes cAnopies. Most containers have
limited lifes as well. I own a couple of great looking rigs that cannot legally
be repacked because the manufacturers have told the FAA that they do not support
rigs older than 10 years. Look great but not legal. That will not impress
your local faa ramp checker. Be sure to have a qualified parachute rigger look
at any rig before you buy!
Mike DeCanio
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251730#251730
Message 4
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| Subject: | Re: Inteference Becker 4201 Radio |
Hans,
I have used the Bendix King KA-39 voltage converter several times and it
seems to work very well. They can be found on Ebay periodically. Since
you have not found your voltage converter in your Yak 52, there is a
possibility the 12 volts is being "tapped" from one of the two gel
batteries instead of it coming from a voltage converter. Look in your
battery compartment for an extra wire on one of the 12 volt battery
terminals. I have seen this before.
Dennis
----- Original Message -----
From: Hans Oortman
To: yak-list@matronics.com
Sent: Monday, July 06, 2009 8:41 AM
Subject: RE: Yak-List: Re: Inteference Becker 4201 Radio
Frank,
I use the PS-Engineering PM1000, which is functioning great on VOX.
I have never had the problem of interference before. When I ferried my
Yak from Lithuania to Holland I did not have this problem.
During the course of time it simply happened that I could not use my
GPS anymore because it was causing interference on my 4201 which did not
happen before. I have never been able to explain this. I checked all the
screening, all are OK.
I have checked the P-leads (including the screening) on the mags,
installed Lonestar filters in these p-leads but they don=92t seem to
make any difference. I also have the capacitor and the psu filter but I
did not install these yet.
After this the remaining item to change is the dc-dc converter but I
have not yet found this unit yet in my Yak52.
Reading from the other mails it seems to be necessary to make sure
that the power to the 4201 is clean as a whistle. I can make and design
such a filter but before I want to do that I want to make sure that this
solves the problem of interference.
What are you guys using as a psu (i.e. what dc-dc converter) for the
supply of power to the 4201??
Any suggestion is welcomed!
Hans Oortman
RS3326K
-------------------------------------------------------------------------
-----
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens Frank Stelwagon
Verzonden: maandag 6 juli 2009 8:49
Aan: yak-list@matronics.com
Onderwerp: Yak-List: Re: Inteference Becker 4201 Radio
The point that the Becker was originally used in Gliders is probably
the reason that it is still a 12 volt radio, as 12 volt gell cells are
pretty common. I have installed them in a couple of CJ's and they have
been fine. We have always used a Sigtronics SP400N intercom and have
excellent results. Use push to talk intercom not VOX. I have seen other
CJs with other radios that are noisy. One thing that has been mentioned
is proper shielding of the "P" leads, a lot of them are in bad shape,
also a ground wire from engine case to structure is a good idea.
Frank
CJ6-A N23021
http://www.matronics.com/Navigator?Yak-Listhttp://forums.matronics.comhtt
p://www.matronics.com/contribution
Message 5
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P. S. I would not put a 40 year old canopy on my back. Period. Even if by some
miracle it is legal.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251733#251733
Message 6
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| Subject: | Idling problem... |
Flew yesterday.. Everything normal on the taxi out, run up, and throughout the
flight..
Landed after 30 mins, throttled back to idle... and the engine wanted to stop!
Had to taxi with a fair amount of power to keep the engine running.
Back at the hanger throttled back to Idle.. and she quit!
Any ideas as to what might cause such a sudden change??? Water??
Thanks in advance
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251734#251734
Message 7
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| Subject: | Re: Inteference Becker 4201 Radio |
Dennis,
Excellent suggestion.thanks.did not think of that but it might be indeed the
reason why I cannot find the dc-dc converter.
I'll keep you posted on the progress.
Hans
RS3326K
_____
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens A. Dennis Savarese
Verzonden: maandag 6 juli 2009 15:50
Aan: yak-list@matronics.com
Onderwerp: Re: Yak-List: Re: Inteference Becker 4201 Radio
Hans,
I have used the Bendix King KA-39 voltage converter several times and it
seems to work very well. They can be found on Ebay periodically. Since you
have not found your voltage converter in your Yak 52, there is a possibility
the 12 volts is being "tapped" from one of the two gel batteries instead of
it coming from a voltage converter. Look in your battery compartment for an
extra wire on one of the 12 volt battery terminals. I have seen this
before.
Dennis
----- Original Message -----
From: Hans Oortman <mailto:pa3arw@euronet.nl>
Sent: Monday, July 06, 2009 8:41 AM
Subject: RE: Yak-List: Re: Inteference Becker 4201 Radio
Frank,
I use the PS-Engineering PM1000, which is functioning great on VOX.
I have never had the problem of interference before. When I ferried my Yak
from Lithuania to Holland I did not have this problem.
During the course of time it simply happened that I could not use my GPS
anymore because it was causing interference on my 4201 which did not happen
before. I have never been able to explain this. I checked all the screening,
all are OK.
I have checked the P-leads (including the screening) on the mags, installed
Lonestar filters in these p-leads but they don't seem to make any
difference. I also have the capacitor and the psu filter but I did not
install these yet.
After this the remaining item to change is the dc-dc converter but I have
not yet found this unit yet in my Yak52.
Reading from the other mails it seems to be necessary to make sure that the
power to the 4201 is clean as a whistle. I can make and design such a filter
but before I want to do that I want to make sure that this solves the
problem of interference.
What are you guys using as a psu (i.e. what dc-dc converter) for the supply
of power to the 4201??
Any suggestion is welcomed!
Hans Oortman
RS3326K
_____
Van: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] Namens Frank Stelwagon
Verzonden: maandag 6 juli 2009 8:49
Aan: yak-list@matronics.com
Onderwerp: Yak-List: Re: Inteference Becker 4201 Radio
The point that the Becker was originally used in Gliders is probably the
reason that it is still a 12 volt radio, as 12 volt gell cells are pretty
common. I have installed them in a couple of CJ's and they have been fine.
We have always used a Sigtronics SP400N intercom and have excellent results.
Use push to talk intercom not VOX. I have seen other CJs with other radios
that are noisy. One thing that has been mentioned is proper shielding of
the "P" leads, a lot of them are in bad shape, also a ground wire from
engine case to structure is a good idea.
Frank
CJ6-A N23021
http://www.matronics.com/Navigator?Yak-List
http://forums.matronics.com
http://www.matronics.com/contribution
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 8
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Agreed!=C2- They are best used for sun shade at a Saturday afternoon BBQ.
=C2- JB
----- Original Message -----
From: "N642K" <mdecanio@mac.com>
Sent: Monday, July 6, 2009 8:57:47 AM GMT -06:00 US/Canada Central
Subject: Yak-List: Re: Parachutes
P. S. I would not put a 40 year old canopy on my back. Period. Even if by s
ome miracle it is legal.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251733#251733
===========
===========
MS -
===========
e -
=C2- =C2- =C2- =C2- =C2--Matt Dralle, List Admin.
===========
Message 9
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| Subject: | Re: Idling problem... |
M14P or Huosai??????
Sounds like a fairly large intake manifold leak.
Walt
----- Original Message -----
From: "Zjopa" <rtthornton@gmail.com>
Sent: Monday, July 06, 2009 6:59 AM
Subject: Yak-List: Idling problem...
>
> Flew yesterday.. Everything normal on the taxi out, run up, and throughout
> the flight..
>
> Landed after 30 mins, throttled back to idle... and the engine wanted to
> stop!
> Had to taxi with a fair amount of power to keep the engine running.
>
> Back at the hanger throttled back to Idle.. and she quit!
>
> Any ideas as to what might cause such a sudden change??? Water??
>
> Thanks in advance
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=251734#251734
>
>
>
Message 10
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| Subject: | Re: Becker radio noise |
Got it. Also, there is a side tone adjustment. Any suggestions on this?
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251776#251776
Message 11
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| Subject: | Idling problem... |
Check to make sure your primer was/is locked in the closed position.
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 Zjopa
Sent: Monday, July 06, 2009 6:59 AM
Subject: Yak-List: Idling problem...
Flew yesterday.. Everything normal on the taxi out, run up, and throughout
the flight..
Landed after 30 mins, throttled back to idle... and the engine wanted to
stop!
Had to taxi with a fair amount of power to keep the engine running.
Back at the hanger throttled back to Idle.. and she quit!
Any ideas as to what might cause such a sudden change??? Water??
Thanks in advance
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251734#251734
Message 12
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| Subject: | Re: Inteference Becker 4201 Radio |
Can anyone please explain the best way to shield the p-leads. Mine have been worked
on to attempt to install a Horizon tach in the rear with no luck on getting
a good signal for the tach. I've looked at the attachment of the stock shielding
at the magnetos and they seem fine.
I'd like to know, what gage wire to use, best shielding, etc. Also, are there
any differences for the tach gen leads (wire gaga, etc).
Thanks,
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251778#251778
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| Subject: | Re: Inteference Becker 4201 Radio |
Dennis:
When you used the KA-39 (which I have also) did you shield the lead from the KA-39
to the Becker? The Becker installation diagram does not specify this be shielded.
Craig
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251783#251783
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Message 15
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| Subject: | Re: Idling problem... |
M-14, and the primer was locked... first thing I checked.
I had a water in fuel problem a few hours ago... wondering if there might be some
residual?? Vladimir and I thoroughly drained the tanks and the fuel filter...
Might try that again today.
--------
"Well, boys, we got three engines out, we got more holes in us than a horse
trader's mule, the radio is gone and we're leaking fuel and if we was flying
any lower why we'd need sleigh bells on this thing... "
- Henry Paulson, US Treasury Secretary
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Message 16
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| Subject: | Re: Inteference Becker 4201 Radio |
Craig, just to be sure I understand this ..... Your back seat has a
Horizon tach installed and it does not work? Where did they connect to
the original P leads in order to get the signals back there?
Wire gage and type:
Two issues.
1. The size of the wire and shielding going to the mag itself from the
MAG SWITCHES. In this case, you probably want to stick to original wire
center conductor gages as it is carrying some current, although not THAT
much. I would suspect 14 to 16 gage would work just fine but I would
not want to go any smaller. But in truth, I really do not KNOW what
exact wire gage is required here, so that said, I would go original
size, or one size bigger just to be sure.
2. The wire to the electronic tach should not require any current
carrying capability really. Here, you could go with 22 gage with no
problem at all.
In every case, of course the wires should be shielded. The best
shielded wire you can buy with the highest density of shielding. Even a
double shield if you can find it. Use individual wires with shields,
NOT two wires twisted in ONE shield.
Tach Gen. Again, I'd say 16-18 gage would be fine, and is shielded as
you can get it!
I am not really sure I am answering your question.
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Craig
Winkelmann
Sent: Monday, July 06, 2009 12:42 PM
Subject: Yak-List: Re: Inteference Becker 4201 Radio
Can anyone please explain the best way to shield the p-leads. Mine have
been worked on to attempt to install a Horizon tach in the rear with no
luck on getting a good signal for the tach. I've looked at the
attachment of the stock shielding at the magnetos and they seem fine.
I'd like to know, what gage wire to use, best shielding, etc. Also, are
there any differences for the tach gen leads (wire gaga, etc).
Thanks,
Craig
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Message 17
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| Subject: | Interference Becker 4201 radio |
Lot's to talk about after reading your message.
1. Disconnect the antenna from the radio and see if the noise goes
away. This test will tell us one heck of a lot. Remove antenna at the
radio and turn squelch off and listen.
2. The voltage adjusting screw adjusts the bias voltage going to the
voltage regulator which controls the generator output voltage. In other
words, it adjusts 28 vdc out of the generator. It is a SMALL range of
adjustment. BIG adjustments are made at the carbon pile regulator
itself.
This statement is very perplexing:
" When the GPS is connected to the power plug and switched on, the noise
level on the VHF opens the squelch which makes it unuseable in flight.
Switched off gps: noise is reduced but squelch is still opened 6 out of
10 sec.
Disconnected power supply lead from GPS but kept it connected to the
plane, same result as GPS being switched off, i.e. the VHF is picking up
interference via its antenna but the noise is generated one way or the
other on the power bus??"
First, just to be absolutely sure, remove the antenna coax at the radio
and run your GPS noise tests again.
Next, make sure you test Dennis Savarese's idea about where the 12 volts
is coming from. Is it coming from a DC to DC converter, or has some one
tapped one of two 12 volt batteries in series?
Moving on:
So you are saying... And please confirm this.... That when you hook the
GPS wiring to the aircraft, with the GPS completely removed and not
connected and NOT turned on or running by battery power, that merely
ADDING THE GPS WIRING ITSELF increases the noise to your radio? And
there is NOTHING in that GPS cable at all other than some WIRE? No
active elements like a little module or something like that? Just some
WIRE? Disconnecting the antenna makes this goes away, get less, stay
the same? Squelch off.
Where is your GPS power cable tapped into the aircraft wiring? Is it
tapped to the same wiring the radio is using? By that I mean, you have
12 volts going to the radio by some method or another... Have you tapped
that same 12 volts to power the GPS, or is it coming from a 28 volt wire
connected somewhere else in the aircraft?
If you are 100% absolutely certain about that all this, as in.. It is
connected to the 12 volt source, it has no modules in it at all, it is
just a piece of wire.... If that is absolutely without a doubt what is
happening... Then there is simply no question that an external noise
source is COUPLING into the GPS wiring and then being fed into the
Becker via the power supply input wiring. Period. No other
possibility. (again, the antenna checks withstanding)
Based on that premise, I would then get a little 12 volt sealed battery.
Use it to power the radio. Remove the aircraft as the power source.
Gell cell or something. It can be very very small since we are not
going to transmit, and receive current draw is less than 100 mills or
so. That's a guess, but it has to be pretty darn low. The noise to the
radio should either go away, or change dramatically.
Thinking out loud, it then appears to be the case that the Becker has
some design issues regarding rejection of external noise on the power
source wiring. We then have a few ways to approach this.
1. Replace the radio. Yeah, I know that idea is less than good, but you
have to at least mention it.
2. Reduce the noise sources that are getting into the wiring. That is
not going to be very easy. You've already done pretty close to all that
can be done.
3. Best solution. Use a TON of filtering on the input wiring to the
radio. This filtering method has to be as close to the radio as
possible for obvious reasons. This is probably going to have to be a
multi-layered approach, because we really do not have any hard ideas on
what the noise source frequency range is. Of course, you have to know
right up front that EVERY SINGLE WIRE that goes to the Becker is going
to have to be shielded. I mean every single one. ANY wire that allows
noise to ride up and into the radio has to be considered.
Most importantly, the power wiring needs to be shielded.
You will need to make some kind of mount close to the radio and start
adding whatever filters you want to try. I would try several approaches
just for the heck of it... First would be a big cap, very close to the
radio, attached to 12 volts and ground. 22,000 mmf or so, at 50 volts.
You can start smaller and just see if it helps. Even 5000 mmf should
tell you if it helps at all. Torroidal chokes.... Commercial
through-line filters. Etc.
This is a tough problem. I'm still thinking.
On the other hand, if all this just stops dead when you disconnect the
antenna, the direction of attack changes dramatically.
Mark Bitterlich
P.s. I don't think I'll buy a Becker.
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Hans Oortman
Sent: Friday, July 03, 2009 9:02 AM
Subject: Yak-List: Interference Becker 4201 radio
Mark,
I finally made the time available to do the tests/modifications we have
talked about with respect to the interference on a Becker VHF radio in
my Yak52.
I installed the Lonestar P-lead filters on both mags. Found that both
screens of the p-leads are in perfect condition but installed the
filters , just to make sure.
The screening can now be called perfect. I have made a special copper
"plug"
to fill up for the thinner wires on the filters. The screens of the
filter wires have been soldered to those "plugs" and locked in the mags.
Everything has been fixed thoroughly and inspected for grounding.
All OK so far. Started the engine and found no difference on the VHF,
i.e.
the interference is still there. That means: the squelch is opened by
the interference. Switching off the squelch it appears that there is no
constant noise level but more of a kind of rattling noise which opens
the squelch.
Checked antenna...found no problem or loose wires. Swr is within the
airband
1 : 1.5 max.
So in my humble opinion there is only 1 thing left: the interference is
going into the vhf via the power supply or the power is that "dirty"
that it is picked up by the vhf antenna.....
I know that the Becker gets its power via a dc-dc converter of some
sort, after all the Yak has 24v standard power. Is the 12 volts present
on any standard Yak or is there a built in down converter somewhere??
What is the "voltage adjustment" screw meant for in the front cockpit??
Did some tests with the GPS also. When the GPS is connected to the power
plug and switched on, the noise level on the VHF opens the squelch which
makes it unuseable in flight.
Switched off gps: noise is reduced but squelch is still opened 6 out of
10 sec. Disconnected power supply lead from GPS but kept it connected to
the plane, same result as GPS being switched off, i.e. the VHF is
picking up interference via its antenna but the noise is generated one
way or the other on the power bus??
I have come to a point of saturation in my mind about the cause of this.
Taking a scope into the cockpit is probably the only way to find out
whether there is any noise on the power bus.
Probably another way is to power the VHF via the cigarette ligher
connector with another dc-dc converter. Thus bypassing the present
circuitry but still using the power on board.
Any suggestions, thoughts are welcomed!
Hans
RA3326K
Mob: +31 653 286022
Message 18
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| Subject: | Re: Inteference Becker 4201 Radio |
I did not.
Dennis
----- Original Message -----
From: Craig Winkelmann
To: yak-list@matronics.com
Sent: Monday, July 06, 2009 11:48 AM
Subject: Yak-List: Re: Inteference Becker 4201 Radio
Dennis:
When you used the KA-39 (which I have also) did you shield the lead
from the KA-39 to the Becker? The Becker installation diagram does not
specify this be shielded.
Craig
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Message 19
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| Subject: | Idling problem... |
Some thoughts:
Yes, check for more water.
Is this known good fuel?
Take a look at fuel pressure at idle.
Pull both fuel filters and check them.
Run on one mag at a time at idle and make sure it does the same thing on
both mags, running on one at a time.
Check intake tubes to be sure they are tight at both ends.
If you get desperate, and nothing else seems to help, and you are using
automotive spark plugs, consider replacing them, and make sure they are
gapped correctly.
Find a good mechanic. I am not one of those. Vladimir is one of the
best. Tell him I said hello.
Mark Bitterlich
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Zjopa
Sent: Monday, July 06, 2009 9:59 AM
Subject: Yak-List: Idling problem...
Flew yesterday.. Everything normal on the taxi out, run up, and
throughout the flight..
Landed after 30 mins, throttled back to idle... and the engine wanted to
stop!
Had to taxi with a fair amount of power to keep the engine running.
Back at the hanger throttled back to Idle.. and she quit!
Any ideas as to what might cause such a sudden change??? Water??
Thanks in advance
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Message 20
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| Subject: | Re: Interference Becker 4201 radio |
I contacted Becker USA today at lunch and spoke with a tech for about 30 minutes
on my noise issue. Two things he mentioned to me. First, the radio is TSOed
so it was required to meet FAA specs. many of the other small radios are not
TSOed so the Becker seems to be the better choice from an environmental standpoint.
Second, the radio was indeed designed for gliders first. Then modified
for the FAA TSO requirements.
The tech is perplexed because my Garmin SL-30 has not one bit of noise and the
power for the Becker is coming from a King KA-39 downconverter and this is the
only thing on the converter. The antenna for the SL30 and the Becker were swapped
and the noise persisted. His thought is that the RF section of the Becker
is too sensitive and that it is picking up engine noise on the antenna. He
said the Becker is set up so that you can hear ATC from about 100 miles away
(hence very sensitive). He has asked me to remove the radio and send it back
to them for RF interference testing.
Craig
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