Today's Message Index:
----------------------
1. 04:41 AM - Re: Radio Noise CJ6 (A. Dennis Savarese)
2. 07:30 AM - CJ Remote Compass System for Sale (Elmar & Manuela Hegenauer)
3. 07:41 AM - Re: Radio Noise CJ6 (Paul Lewis)
4. 08:17 AM - Re: Radio Noise CJ6 (Brian Lloyd)
5. 08:19 AM - Re: Radio Noise CJ6 (A. Dennis Savarese)
6. 08:28 AM - Re: Radio Noise CJ6 (Brian Lloyd)
7. 08:36 AM - Re: Radio Noise CJ6 (Brian Lloyd)
8. 09:56 AM - Re: CJ Remote Compass System for Sale (J Rittenbach)
9. 09:56 AM - Re: Radio Noise CJ6 (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
10. 11:15 AM - Re: Radio Noise CJ6 (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
11. 11:15 AM - Re: Radio Noise CJ6 (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
12. 12:29 PM - Re: CJ Remote Compass System for Sale (Elmar & Manuela Hegenauer)
13. 02:18 PM - Re: Re: CJ Remote Compass System for Sale (Gary Gabbard)
14. 02:18 PM - Re: Radio Noise CJ6 (Paul Lewis)
15. 07:42 PM - Re: Radio Noise CJ6 (Brian Lloyd)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Radio Noise CJ6 |
Paul,
Although this doesn't happen very often, when it does here's a fix which
has proven successful.
You will need two of these filters from Aircraft Spruce.
http://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php
Remove the P lead from the magneto and de-solder the "button" on the end
of the P-lead wire. Connect the wire you just de-soldered from the
button to the screw terminal on the P-lead. Solder the wire on the
filter to the P-lead "button" and reinstall in the magneto.
Mount the filter on one of the studs and nuts on the round accessory
case at the back of the engine. Usually you can mount it at about the
10-11 o'clock position. For the other mag, mount it's filter at about
the 1-2 o'clock position.
Hope this helps.
Dennis
On 3/14/2012 6:58 PM, Brian Lloyd wrote:
> On Wed, Mar 14, 2012 at 4:04 PM, Okanogan Lew <vplewis@community.org
> <mailto:vplewis@community.org>> wrote:
>
> <vplewis@community.org <mailto:vplewis@community.org>>
>
> Guys, my radio has back ground noise when transmitting & the
> engine is running. I have installed the auto spark plug
> conversion kit. Does anyone know of a fix? Thanks.
>
>
> What kind of noise? There several primary noise sources:
>
> 1. ignition;
> 2. generator commutator;
> 3. generator voltage regulator;
> 4. rotary inverter commutators.
>
> Ignition noise is usually a pop-pop-pop to a machine-gun/ripping noise
> that increases and decreases with engine RPM. Generator noise usually
> comes on suddenly when you increase RPM from idle and changes in
> volume as you turn things on and off. Rotary inverters generally are a
> fairly raspy tone that is continuous.
>
> If you have done an alternator conversion then that replaces items 2
> and 3 above. If an alternator is working properly, it will be quiet.
> If you hear a more-or-less pure tone/whistle that changes with engine
> RPM, it probably means that one or more of the diodes in the
> alternator has failed.
>
> So, what does it sound like?
>
> And if you only hear it when you are transmitting but not when
> receiving, and it goes away if you unplug the microphone, then it is
> probably a mic jack grounding problem. The microphone jack(s) should
> be insulated from the airframe and have their own ground wire that is
> routed directly back to the comm radio or to the Intercom/audio panel
> if you have one. The mic jack should have black plastic or fiber
> washers insulating it from the metal panel.
>
> --
> Brian Lloyd, WB6RQN/J79BPL
> 3191 Western Dr.
> Cameron Park, CA 95682
> brian@lloyd.com <mailto:brian@lloyd.com>
> +1.767.617.1365 (Dominica)
> +1.916.877.5067 (USA)
>
> *
>
>
> *
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | CJ Remote Compass System for Sale |
I have a complete remote compass
system in perfect working condition
for sale.
Included:
- remote compass GHC-2
- compass amplifier FL-3
- compass gyro TH-3
- 2 x compass indicators ZH-4
Asking for everything US$259.00
Please email for pictures.
cheers
Elmar
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Radio Noise CJ6 |
My buddy says that it is a howling steady noise that does not change with
engine RPM. The plane does have the alternator conversion. It maybe the
ground, which I will check today, Thanks for the help.
Paul
On Thu, Mar 15, 2012 at 4:38 AM, A. Dennis Savarese <
dsavarese0812@bellsouth.net> wrote:
> dsavarese0812@bellsouth.net>
>
> Paul,
> Although this doesn't happen very often, when it does here's a fix which
> has proven successful.
>
> You will need two of these filters from Aircraft Spruce.
>
> http://www.aircraftspruce.com/**catalog/elpages/lsMagFilter.**php<http://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php>
>
> Remove the P lead from the magneto and de-solder the "button" on the end
> of the P-lead wire. Connect the wire you just de-soldered from the button
> to the screw terminal on the P-lead. Solder the wire on the filter to the
> P-lead "button" and reinstall in the magneto.
>
> Mount the filter on one of the studs and nuts on the round accessory case
> at the back of the engine. Usually you can mount it at about the 10-11
> o'clock position. For the other mag, mount it's filter at about the 1-2
> o'clock position.
>
> Hope this helps.
> Dennis
>
> On 3/14/2012 6:58 PM, Brian Lloyd wrote:
>
>> On Wed, Mar 14, 2012 at 4:04 PM, Okanogan Lew <vplewis@community.org<mailto:
>> vplewis@community.org>**> wrote:
>>
>> <vplewis@community.org <mailto:vplewis@community.org>**>
>>
>>
>> Guys, my radio has back ground noise when transmitting & the
>> engine is running. I have installed the auto spark plug
>> conversion kit. Does anyone know of a fix? Thanks.
>>
>>
>> What kind of noise? There several primary noise sources:
>>
>> 1. ignition;
>> 2. generator commutator;
>> 3. generator voltage regulator;
>> 4. rotary inverter commutators.
>>
>>
>> Ignition noise is usually a pop-pop-pop to a machine-gun/ripping noise
>> that increases and decreases with engine RPM. Generator noise usually comes
>> on suddenly when you increase RPM from idle and changes in volume as you
>> turn things on and off. Rotary inverters generally are a fairly raspy tone
>> that is continuous.
>>
>> If you have done an alternator conversion then that replaces items 2 and
>> 3 above. If an alternator is working properly, it will be quiet. If you
>> hear a more-or-less pure tone/whistle that changes with engine RPM, it
>> probably means that one or more of the diodes in the alternator has failed.
>>
>> So, what does it sound like?
>>
>> And if you only hear it when you are transmitting but not when receiving,
>> and it goes away if you unplug the microphone, then it is probably a mic
>> jack grounding problem. The microphone jack(s) should be insulated from the
>> airframe and have their own ground wire that is routed directly back to the
>> comm radio or to the Intercom/audio panel if you have one. The mic jack
>> should have black plastic or fiber washers insulating it from the metal
>> panel.
>>
>> --
>> Brian Lloyd, WB6RQN/J79BPL
>> 3191 Western Dr.
>> Cameron Park, CA 95682
>> brian@lloyd.com <mailto:brian@lloyd.com>
>> +1.767.617.1365 (Dominica)
>> +1.916.877.5067 (USA)
>>
>> *
>>
>>
>> *
>>
>
>
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Radio Noise CJ6 |
On Thu, Mar 15, 2012 at 7:38 AM, Paul Lewis <okanoganlew@gmail.com> wrote:
> My buddy says that it is a howling steady noise that does not change with
> engine RPM. The plane does have the alternator conversion. It maybe the
> ground, which I will check today, Thanks for the help.
>
If it is a howling steady tone and does not change with engine RPM, and if
you have an alternator conversion, and it appears only on transmit, there
are two possible problems:
1. you are hearing interference from one of the rotary inverters that
drive the gyros;
2. you have RF feedback from the transmitter to the mic in the headset.
Is this a new problem that suddenly developed or has it been going on for a
long time? If it has been going on since you installed the radios and
changing microphones does not change the problem then I would check the
grounding of the mic jack. Hopefully it is something simple like the
installer just forget to put in the insulation washers but did put in the
ground wire back to the avionics stack. If the avionics installer cut
corners and depended on the airframe for ground you are going to need to
have an avionics installer rewire the mic jack(s). If you do that I
recommend you specify that they use shielded wire.
If it occurred suddenly then I would look for a possible problem with the
antenna coax shield. The antenna wire consists of a center conductor
surrounded by insulation then a copper braid. That copper braid needs to be
continuous and unbroken from the back of the transmitter to the base of the
comm antenna. If there is a break in it, it is possible that the comm will
appear to otherwise work normally but it can increase RF in the cockpit
that then gets picked up by the mic and fed back to the transmitter,
causing a howling noise.
Try the following:
1. Try using different mics and try changing the position of the
headset/mic to see if that affects the situation. That will help diagnose
the problem.
2. Try transmitting with the gyros turned off. If it is there when the
gyros are not running, that tells you the problem is not the rotary
inverters and more likely RF feedback.
3. Visually check the antenna cable from the back of the radio to the
antenna to make sure it isn't chaffed or otherwise damaged.
4. Remove the antenna and check to see that the paint has been scraped
away from around the screw holes. The screw bushings on the base of the
antenna form the ground connection for the antenna. Sometimes installers
get lazy and don't make sure that they have good metal-to-metal contact at
these points which then leads to problems like this later.
Good luck. I am sure you will find the problem. I am headed off to Front
Sight to renew my 30-state CCW so won't be checking email very often for
the next 6 days but I will try to check back at least once to see what your
progress is.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Radio Noise CJ6 |
That's a good idea. There is also another filter which could be
considered. I have used these in the past to remove "junk" on the DC
bus and it work. Here's a link to the page on the manufacturer's web
site. http://www.lonestaraviation.com/AC-DC-Noise-Filters/
Dennis
On 3/15/2012 9:38 AM, Paul Lewis wrote:
> My buddy says that it is a howling steady noise that does not change
> with engine RPM. The plane does have the alternator conversion. It
> maybe the ground, which I will check today, Thanks for the help.
> Paul
>
> On Thu, Mar 15, 2012 at 4:38 AM, A. Dennis Savarese
> <dsavarese0812@bellsouth.net <mailto:dsavarese0812@bellsouth.net>> wrote:
>
> <dsavarese0812@bellsouth.net <mailto:dsavarese0812@bellsouth.net>>
>
> Paul,
> Although this doesn't happen very often, when it does here's a fix
> which has proven successful.
>
> You will need two of these filters from Aircraft Spruce.
>
> http://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php
>
> Remove the P lead from the magneto and de-solder the "button" on
> the end of the P-lead wire. Connect the wire you just de-soldered
> from the button to the screw terminal on the P-lead. Solder the
> wire on the filter to the P-lead "button" and reinstall in the
> magneto.
>
> Mount the filter on one of the studs and nuts on the round
> accessory case at the back of the engine. Usually you can mount
> it at about the 10-11 o'clock position. For the other mag, mount
> it's filter at about the 1-2 o'clock position.
>
> Hope this helps.
> Dennis
>
> On 3/14/2012 6:58 PM, Brian Lloyd wrote:
>
> On Wed, Mar 14, 2012 at 4:04 PM, Okanogan Lew
> <vplewis@community.org <mailto:vplewis@community.org>
> <mailto:vplewis@community.org <mailto:vplewis@community.org>>>
> wrote:
>
> <vplewis@community.org <mailto:vplewis@community.org>
> <mailto:vplewis@community.org <mailto:vplewis@community.org>>>
>
>
> Guys, my radio has back ground noise when transmitting & the
> engine is running. I have installed the auto spark plug
> conversion kit. Does anyone know of a fix? Thanks.
>
>
> What kind of noise? There several primary noise sources:
>
> 1. ignition;
> 2. generator commutator;
> 3. generator voltage regulator;
> 4. rotary inverter commutators.
>
>
> Ignition noise is usually a pop-pop-pop to a
> machine-gun/ripping noise that increases and decreases with
> engine RPM. Generator noise usually comes on suddenly when you
> increase RPM from idle and changes in volume as you turn
> things on and off. Rotary inverters generally are a fairly
> raspy tone that is continuous.
>
> If you have done an alternator conversion then that replaces
> items 2 and 3 above. If an alternator is working properly, it
> will be quiet. If you hear a more-or-less pure tone/whistle
> that changes with engine RPM, it probably means that one or
> more of the diodes in the alternator has failed.
>
> So, what does it sound like?
>
> And if you only hear it when you are transmitting but not when
> receiving, and it goes away if you unplug the microphone, then
> it is probably a mic jack grounding problem. The microphone
> jack(s) should be insulated from the airframe and have their
> own ground wire that is routed directly back to the comm radio
> or to the Intercom/audio panel if you have one. The mic jack
> should have black plastic or fiber washers insulating it from
> the metal panel.
>
> --
> Brian Lloyd, WB6RQN/J79BPL
> 3191 Western Dr.
> Cameron Park, CA 95682
> brian@lloyd.com <mailto:brian@lloyd.com>
> <mailto:brian@lloyd.com <mailto:brian@lloyd.com>>
> +1.767.617.1365 <tel:%2B1.767.617.1365> (Dominica)
> +1.916.877.5067 <tel:%2B1.916.877.5067> (USA)
>
> *
>
>
> *
>
>
> ===================================
> rget="_blank">http://www.matronics.com/Navigator?Yak-List
> ===================================
> http://forums.matronics.com
> ===================================
> le, List Admin.
> ="_blank">http://www.matronics.com/contribution
> ===================================
>
>
> *
>
>
> *
--
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Radio Noise CJ6 |
While I am thinking about it, one other thing to try is to make sure that
the mic gain in the mic and the radio are both adjusted properly. Some
amplified microphones have a small adjustment in the microphone itself. You
want to turn that down, usually anticlockwise, until there is no mic audio,
then turn it up until you get clear, full transmit audio. The comm
transmitter itself also has an adjustment for this as well. If you have
Apollo/Garmin radios (SL-30 comes to mind here) there is a menu option to
adjust mic gain. Some radios require pulling the radio from the panel and
(sometimes) opening it up to adjust. In that case you should leave the
adjustment to an avionics shop.
My experience is that often the mic gains are set too high in order to
accommodate a wider range of mics and then they depend on the automatic mic
level circuitry in the radio. Getting the mic gains set properly will
reduce the likelihood of RF feedback and it will give you better, clearer
transmit audio.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Radio Noise CJ6 |
On Thu, Mar 15, 2012 at 8:17 AM, A. Dennis Savarese <
dsavarese0812@bellsouth.net> wrote:
> dsavarese0812@bellsouth.net>
>
> That's a good idea. There is also another filter which could be
> considered. I have used these in the past to remove "junk" on the DC bus
> and it work. Here's a link to the page on the manufacturer's web site.
> http://www.lonestaraviation.**com/AC-DC-Noise-Filters/<http://www.lonestaraviation.com/AC-DC-Noise-Filters/>
Dennis,
It is probably a good idea to do the troubleshooting before adding things
in. If the avionics were working properly but now aren't, it is more likely
something that has changed, not the need to add something new. It is only
in very rare problem cases where I have needed to add additional filtering
to the power. Filters such as the ones you suggest are already part of the
stock Chinese electrical system, especially at the output of the generator
(and alternators don't really need them).
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: CJ Remote Compass System for Sale |
I'll take it Elmar
I'll contact you offline.
JS Rittenbach
On Mar 15, 2012, at 7:28 AM, Elmar & Manuela Hegenauer <samira.h@shaw.ca> wrote:
>
> I have a complete remote compass
> system in perfect working condition
> for sale.
>
> Included:
>
> - remote compass GHC-2
> - compass amplifier FL-3
> - compass gyro TH-3
> - 2 x compass indicators ZH-4
>
> Asking for everything US$259.00
>
> Please email for pictures.
>
> cheers
>
> Elmar
>
>
>
>
>
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
"Background noise when transmitting" is not quite definitive enough to
troubleshoot the problem. It's true that converting to automotive spark
plug wires might cause a slight increase in receive noise. However, it
would have to be pretty darn bad for it to cause a problem with TRANSMIT
audio.
What Doc has suggested are sometimes effective cures for problems caused
by magneto or spark plug wire noise.
However, since my actual field of expertise is "radios" and RF by and
large, I tend to try and focus more specifically on what the problem
really is and where exactly it is coming from. You don't know the
answer to that yet.
So the first thing is: Did you really mean what you said? You are
getting background noise when you are transmitting and the engine is
running? Is this noise in your headset when you transmit? This is
called SIDE-TONE and is the audio you get in your headset when you hear
yourself talking on the radio while transmitting.
Get someone else to listen to your transmit audio from another aircraft
or using a handheld. Do they hear it?
What exactly.... I mean EXACTLY does this background noise sound like?
Buzz, Hum, clicking? Does it change with engine RPM speed?
UNPLUG the microphone jack from your headset where it plugs into the
aircraft. Key the radio with the Push to Talk (PTT) button. Do you
still get this same background noise with the microphone unplugged?
Unplug the whole HEADSET... all of it... key the radio again and listen
to the transmitter with a handheld... is the noise still there?
Is the radio powered from a 28 to `12 volt converter, or is it running
straight off main bus 28 volts DC?
Do you have any noise when the engine is running in RECEIVE? Tune into
a weak signal if you can find one, and listen closely. Turn the squelch
off.
This is the start.... go from there.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Roger Kemp
M.D.
Sent: Wednesday, March 14, 2012 11:27 PM
Subject: Re: Yak-List: Radio Noise CJ6
<viperdoc@mindspring.com>
Magneto Filters and spark plug wire ignition shielding braid. Look on
the Aircraft Spruce website for them. Your work is not done.
Doc
Sent from my iPad
On Mar 14, 2012, at 6:04 PM, "Okanogan Lew" <vplewis@community.org>
wrote:
>
> Guys, my radio has back ground noise when transmitting & the engine is
running. I have installed the auto spark plug conversion kit. Does
anyone know of a fix? Thanks.
>
> Paul Lewis
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=368531#368531
>
>
>
>
>
>
>
>
>
>
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Have him start turning switches off to try and make it go away.
Turn off the Gyros's, turn off the alternator, start pulling circuit
breakers, etc., etc.
The idea is to narrow it down to a specific source IF POSSIBLE. If you
can't do that, you'll have to end up shot-gunning.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Paul Lewis
Sent: Thursday, March 15, 2012 10:39 AM
Subject: Re: Yak-List: Radio Noise CJ6
My buddy says that it is a howling steady noise that does not change
with engine RPM. The plane does have the alternator conversion. It
maybe the ground, which I will check today, Thanks for the help.
Paul
On Thu, Mar 15, 2012 at 4:38 AM, A. Dennis Savarese
<dsavarese0812@bellsouth.net> wrote:
<dsavarese0812@bellsouth.net>
Paul,
Although this doesn't happen very often, when it does here's a
fix which has proven successful.
You will need two of these filters from Aircraft Spruce.
http://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php
<http://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php>
Remove the P lead from the magneto and de-solder the "button" on
the end of the P-lead wire. Connect the wire you just de-soldered from
the button to the screw terminal on the P-lead. Solder the wire on the
filter to the P-lead "button" and reinstall in the magneto.
Mount the filter on one of the studs and nuts on the round
accessory case at the back of the engine. Usually you can mount it at
about the 10-11 o'clock position. For the other mag, mount it's filter
at about the 1-2 o'clock position.
Hope this helps.
Dennis
On 3/14/2012 6:58 PM, Brian Lloyd wrote:
On Wed, Mar 14, 2012 at 4:04 PM, Okanogan Lew
<vplewis@community.org <mailto:vplewis@community.org>> wrote:
<vplewis@community.org
<mailto:vplewis@community.org>>
Guys, my radio has back ground noise when
transmitting & the
engine is running. I have installed the auto spark
plug
conversion kit. Does anyone know of a fix? Thanks.
What kind of noise? There several primary noise sources:
1. ignition;
2. generator commutator;
3. generator voltage regulator;
4. rotary inverter commutators.
Ignition noise is usually a pop-pop-pop to a
machine-gun/ripping noise that increases and decreases with engine RPM.
Generator noise usually comes on suddenly when you increase RPM from
idle and changes in volume as you turn things on and off. Rotary
inverters generally are a fairly raspy tone that is continuous.
If you have done an alternator conversion then that
replaces items 2 and 3 above. If an alternator is working properly, it
will be quiet. If you hear a more-or-less pure tone/whistle that changes
with engine RPM, it probably means that one or more of the diodes in the
alternator has failed.
So, what does it sound like?
And if you only hear it when you are transmitting but
not when receiving, and it goes away if you unplug the microphone, then
it is probably a mic jack grounding problem. The microphone jack(s)
should be insulated from the airframe and have their own ground wire
that is routed directly back to the comm radio or to the Intercom/audio
panel if you have one. The mic jack should have black plastic or fiber
washers insulating it from the metal panel.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com <mailto:brian@lloyd.com>
+1.767.617.1365 <tel:%2B1.767.617.1365> (Dominica)
+1.916.877.5067 <tel:%2B1.916.877.5067> (USA)
*
*
===================================
rget="_blank">http://www.matronics.com/Navigator?Yak-List
===================================
http://forums.matronics.com
===================================
le, List Admin.
="_blank">http://www.matronics.com/contribution
===================================
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Actually Brian, all informed inputs should be welcome.
Even yours.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Brian Lloyd
Sent: Thursday, March 15, 2012 11:33 AM
Subject: Re: Yak-List: Radio Noise CJ6
On Thu, Mar 15, 2012 at 8:17 AM, A. Dennis Savarese <dsavarese0812@bellsouth.net>
wrote:
That's a good idea. There is also another filter which could be considered. I have used these in the past to remove "junk" on the DC bus and it work. Here's a link to the page on the manufacturer's web site. http://www.lonestaraviation.com/AC-DC-Noise-Filters/ <http://www.lonestaraviation.com/AC-DC-Noise-Filters/>
Dennis,
It is probably a good idea to do the troubleshooting before adding things in. If
the avionics were working properly but now aren't, it is more likely something
that has changed, not the need to add something new. It is only in very rare
problem cases where I have needed to add additional filtering to the power.
Filters such as the ones you suggest are already part of the stock Chinese electrical
system, especially at the output of the generator (and alternators don't
really need them).
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: CJ Remote Compass System for Sale |
Everything is sold, thank you.
cheers
Elmar
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: CJ Remote Compass System for Sale |
Ok. Thank you. Gary.
Sent from my iPhone
On Mar 15, 2012, at 12:25, Elmar & Manuela Hegenauer <samira.h@shaw.ca> wrote:
>
> Everything is sold, thank you.
>
> cheers
>
> Elmar
>
>
>
>
>
Message 14
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Radio Noise CJ6 |
I can't hear it when transmitting or receiving & I have tried turning off
the gyro's, with no effect. I am still working on the grounding issue. I
have had ATC complain in the past about background noise, but I don't
remember if it was before the auto plug conversion.
On Thu, Mar 15, 2012 at 11:10 AM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E <mark.bitterlich@navy.mil> wrote:
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
> Have him start turning switches off to try and make it go away.
>
> Turn off the Gyros's, turn off the alternator, start pulling circuit
> breakers, etc., etc.
>
> The idea is to narrow it down to a specific source IF POSSIBLE. If you
> can't do that, you'll have to end up shot-gunning.
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Paul Lewis
> Sent: Thursday, March 15, 2012 10:39 AM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: Radio Noise CJ6
>
> My buddy says that it is a howling steady noise that does not change
> with engine RPM. The plane does have the alternator conversion. It
> maybe the ground, which I will check today, Thanks for the help.
>
> Paul
>
>
> On Thu, Mar 15, 2012 at 4:38 AM, A. Dennis Savarese
> <dsavarese0812@bellsouth.net> wrote:
>
>
> <dsavarese0812@bellsouth.net>
>
> Paul,
> Although this doesn't happen very often, when it does here's a
> fix which has proven successful.
>
> You will need two of these filters from Aircraft Spruce.
>
> http://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php
> <http://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php>
>
> Remove the P lead from the magneto and de-solder the "button" on
> the end of the P-lead wire. Connect the wire you just de-soldered from
> the button to the screw terminal on the P-lead. Solder the wire on the
> filter to the P-lead "button" and reinstall in the magneto.
>
> Mount the filter on one of the studs and nuts on the round
> accessory case at the back of the engine. Usually you can mount it at
> about the 10-11 o'clock position. For the other mag, mount it's filter
> at about the 1-2 o'clock position.
>
> Hope this helps.
> Dennis
>
> On 3/14/2012 6:58 PM, Brian Lloyd wrote:
>
>
> On Wed, Mar 14, 2012 at 4:04 PM, Okanogan Lew
> <vplewis@community.org <mailto:vplewis@community.org>> wrote:
>
> <vplewis@community.org
> <mailto:vplewis@community.org>>
>
>
> Guys, my radio has back ground noise when
> transmitting & the
> engine is running. I have installed the auto spark
> plug
> conversion kit. Does anyone know of a fix? Thanks.
>
>
> What kind of noise? There several primary noise sources:
>
>
> 1. ignition;
> 2. generator commutator;
> 3. generator voltage regulator;
> 4. rotary inverter commutators.
>
>
> Ignition noise is usually a pop-pop-pop to a
> machine-gun/ripping noise that increases and decreases with engine RPM.
> Generator noise usually comes on suddenly when you increase RPM from
> idle and changes in volume as you turn things on and off. Rotary
> inverters generally are a fairly raspy tone that is continuous.
>
> If you have done an alternator conversion then that
> replaces items 2 and 3 above. If an alternator is working properly, it
> will be quiet. If you hear a more-or-less pure tone/whistle that changes
> with engine RPM, it probably means that one or more of the diodes in the
> alternator has failed.
>
> So, what does it sound like?
>
> And if you only hear it when you are transmitting but
> not when receiving, and it goes away if you unplug the microphone, then
> it is probably a mic jack grounding problem. The microphone jack(s)
> should be insulated from the airframe and have their own ground wire
> that is routed directly back to the comm radio or to the Intercom/audio
> panel if you have one. The mic jack should have black plastic or fiber
> washers insulating it from the metal panel.
>
>
> --
> Brian Lloyd, WB6RQN/J79BPL
> 3191 Western Dr.
> Cameron Park, CA 95682
>
> brian@lloyd.com <mailto:brian@lloyd.com>
> +1.767.617.1365 <tel:%2B1.767.617.1365> (Dominica)
> +1.916.877.5067 <tel:%2B1.916.877.5067> (USA)
>
> *
>
>
> *
>
>
> ===================================
> rget="_blank">http://www.matronics.com/Navigator?Yak-List
> ===================================
> http://forums.matronics.com
> ===================================
> le, List Admin.
> ="_blank">http://www.matronics.com/contribution
> ===================================
>
>
Message 15
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Radio Noise CJ6 |
On Thu, Mar 15, 2012 at 11:12 AM, Bitterlich, Mark G CIV Det Cherry Point,
MALS-14 64E <mark.bitterlich@navy.mil> wrote:
> Actually Brian, all informed inputs should be welcome.
>
My comment to Dennis was supposed to be out-of-band. I screwed up.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
brian@lloyd.com
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|