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ScooterF15
Joined: 19 Jun 2006
Posts: 136
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 Posted: Mon Oct 29, 2007 11:34 am Post subject: Radio Static Help |
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4 years ago today I placed my order for RV-10 tail kit #40134 as a birthday present to
myself. Now, 2500 building and 100 flying hours later, I can say it was a pretty nice gift
and well worth it... unfortunately I haven't got all the bugs worked out yet:
I've spent the last few weeks trying to track down a problem with radio static on my
Garmin SL-30 Nav/Comm. The SL-30 is attached to a Garmin GMA-340 Audio panel.
The static itself sounds random (i.e. not obviously uniform like I would expect from an ignition
system), however, it is somehow associated with engine throttle setting. The
static starts around 2000 RPM and gets progressively worse as throttle increases.
On takeoff, it is so bad you can not comprehend any received transmissions. During cruise it appears
to be somehow associated with manifold pressure (i.e. throttle setting, not RPM). It makes
listening to ATC difficult to impossible. I also think it may be affecting my radio
transmissions as well, because when I have a hard time comprehending ATC, they
also have a hard time understanding me. This static appears to be only affecting
the Comm audio, there is no static on NAV audio reception. I have a belly mounted
bent whip VHF antenna and a wingtip VOR antenna. My handheld ICOM VHF radio
does not have any static when used inside the cockpit.
I have searched various lists for ideas and tried to solve this problem, but
I have had no success in changing it at all (for better or worse). Any
suggestions for what to try or where to look will be welcome. Below is a list
of some things I have tried with no luck.
General
-Shut off all avionics (except SL-30) and both ignition systems (not both at the same time)
--So it doesn't appear to be interference from other electronics
Antenna/Coaxial cable
-Added ferrite signal filters at various locations along comm coax.
-Connected SL-30 to a different comm antenna using a piece of RG-400 (tried
various routings to antennas)
-Connected SL-30 Comm to VOR antenna (great reception, still static)
--So it doesn't appear to be antenna related
Power/ground
-Ensured engine grounding cables have good contacts on both ends
-Apparently new Slick Magnetos have internal suppression and do not need a filter
-Separated SL-30 power/ground leads from bundle to reduce potential interference from other wires
-Ran SL-30 +12V and ground leads directly to battery
-Disconnected serial connection between my SL-30 and EFIS indicator
-Connected SL-30 to separate 12V battery sitting on floor of aircraft, disconnected power/ground
to GMA-340. Attached ICOM handheld antenna directly to unit (SL-30 completely isolated
from aircraft)-reception still has static
-Ran ground wire from battery to SL-30 tray
-Checked to ensure headseat jacks were isolated from aircraft ground.
-Checked the shield connections for tachometer and fuel flow sensor wires
I can't think of anything else to try. Again, I'd be happy to hear any suggestions.
Thanks.
-Jim
N312JE
Jim "Scooter" McGrew
http://www.mit.edu/~jsmcgrew
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n8vim(at)arrl.net
Guest
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| Posted: Mon Oct 29, 2007 11:52 am Post subject: Radio Static Help |
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|
Jim,
Here are a couple thoughts:
>During cruise it appears to be somehow associated with manifold
pressure (i.e. throttle setting, not RPM).
Since compression in the cylinder is the only thing that changes at that
time, I'd check to make sure your ignition cables are not leaking
(Current and Voltage through the plug will change with differing pressures).
On your radio side, have you tried:
1. Connecting the end coax to a dummy load? This would check if your
coax is picking it up, especially when combined with your isolating the
power source for the radio (another battery as you already tried)
If you'd like, since you're local to me I can help and also check out
your antenna efficency (I have an antena analyzer).
-Jim 40384
JSMcGrew(at)aol.com wrote:
| Quote: | 4 years ago today I placed my order for RV-10 tail kit #40134 as a
birthday present to
myself. Now, 2500 building and 100 flying hours later, I can say it
was a pretty nice gift
and well worth it... unfortunately I haven't got all the bugs worked
out yet:
I've spent the last few weeks trying to track down a problem with
radio static on my
Garmin SL-30 Nav/Comm. The SL-30 is attached to a Garmin GMA-340 Audio
panel.
The static itself sounds random (i.e. not obviously uniform like I
would expect from an ignition
system), however, it is somehow associated with engine throttle
setting. The
static starts around 2000 RPM and gets progressively worse as throttle
increases.
On takeoff, it is so bad you can not comprehend any received
transmissions. During cruise it appears
to be somehow associated with manifold pressure (i.e. throttle
setting, not RPM). It makes
listening to ATC difficult to impossible. I also think it may be
affecting my radio
transmissions as well, because when I have a hard time comprehending
ATC, they
also have a hard time understanding me. This static appears to be only
affecting
the Comm audio, there is no static on NAV audio reception. I have a
belly mounted
bent whip VHF antenna and a wingtip VOR antenna. My handheld ICOM VHF
radio
does not have any static when used inside the cockpit.
I have searched various lists for ideas and tried to solve this
problem, but
I have had no success in changing it at all (for better or worse). Any
suggestions for what to try or where to look will be welcome. Below is
a list
of some things I have tried with no luck.
General
-Shut off all avionics (except SL-30) and both ignition systems (not
both at the same time)
--So it doesn't appear to be interference from other electronics
Antenna/Coaxial cable
-Added ferrite signal filters at various locations along comm coax.
-Connected SL-30 to a different comm antenna using a piece of RG-400
(tried
various routings to antennas)
-Connected SL-30 Comm to VOR antenna (great reception, still static)
--So it doesn't appear to be antenna related
Power/ground
-Ensured engine grounding cables have good contacts on both ends
-Apparently new Slick Magnetos have internal suppression and do not
need a filter
-Separated SL-30 power/ground leads from bundle to reduce potential
interference from other wires
-Ran SL-30 +12V and ground leads directly to battery
-Disconnected serial connection between my SL-30 and EFIS indicator
-Connected SL-30 to separate 12V battery sitting on floor of aircraft,
disconnected power/ground
to GMA-340. Attached ICOM handheld antenna directly to unit (SL-30
completely isolated
from aircraft)-reception still has static
-Ran ground wire from battery to SL-30 tray
-Checked to ensure headseat jacks were isolated from aircraft ground.
-Checked the shield connections for tachometer and fuel flow sensor wires
I can't think of anything else to try. Again, I'd be happy to hear any
suggestions.
Thanks.
-Jim
N312JE
Jim "Scooter" McGrew
http://www.mit.edu/~jsmcgrew <http://www.mit.edu/%7Ejsmcgrew>
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rv10(at)sinkrate.com
Guest
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| Posted: Mon Oct 29, 2007 12:17 pm Post subject: Radio Static Help |
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You did not say if you have a second COM radio but I assume you do. If you don’t have static on the second COM then you might try swapping radio position on the GMA340? Or possibly use the built in 2 place intercom on the sl30 temporarily bypassing the 340 altogether.
-Ben
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of JSMcGrew(at)aol.com
Sent: Monday, October 29, 2007 12:34 PM
To: rv10-list(at)matronics.com
Subject: Radio Static Help
4 years ago today I placed my order for RV-10 tail kit #40134 as a birthday present to
myself. Now, 2500 building and 100 flying hours later, I can say it was a pretty nice gift
and well worth it... unfortunately I haven't got all the bugs worked out yet:
I've spent the last few weeks trying to track down a problem with radio static on my
Garmin SL-30 Nav/Comm. The SL-30 is attached to a Garmin GMA-340 Audio panel.
The static itself sounds random (i.e. not obviously uniform like I would expect from an ignition
system), however, it is somehow associated with engine throttle setting. The
static starts around 2000 RPM and gets progressively worse as throttle increases.
On takeoff, it is so bad you can not comprehend any received transmissions. During cruise it appears
to be somehow associated with manifold pressure (i.e. throttle setting, not RPM). It makes
listening to ATC difficult to impossible. I also think it may be affecting my radio
transmissions as well, because when I have a hard time comprehending ATC, they
also have a hard time understanding me. This static appears to be only affecting
the Comm audio, there is no static on NAV audio reception. I have a belly mounted
bent whip VHF antenna and a wingtip VOR antenna. My handheld ICOM VHF radio
does not have any static when used inside the cockpit.
I have searched various lists for ideas and tried to solve this problem, but
I have had no success in changing it at all (for better or worse). Any
suggestions for what to try or where to look will be welcome. Below is a list
of some things I have tried with no luck.
General
-Shut off all avionics (except SL-30) and both ignition systems (not both at the same time)
--So it doesn't appear to be interference from other electronics
Antenna/Coaxial cable
-Added ferrite signal filters at various locations along comm coax.
-Connected SL-30 to a different comm antenna using a piece of RG-400 (tried
various routings to antennas)
-Connected SL-30 Comm to VOR antenna (great reception, still static)
--So it doesn't appear to be antenna related
Power/ground
-Ensured engine grounding cables have good contacts on both ends
-Apparently new Slick Magnetos have internal suppression and do not need a filter
-Separated SL-30 power/ground leads from bundle to reduce potential interference from other wires
-Ran SL-30 +12V and ground leads directly to battery
-Disconnected serial connection between my SL-30 and EFIS indicator
-Connected SL-30 to separate 12V battery sitting on floor of aircraft, disconnected power/ground
to GMA-340. Attached ICOM handheld antenna directly to unit (SL-30 completely isolated
from aircraft)-reception still has static
-Ran ground wire from battery to SL-30 tray
-Checked to ensure headseat jacks were isolated from aircraft ground.
-Checked the shield connections for tachometer and fuel flow sensor wires
I can't think of anything else to try. Again, I'd be happy to hear any suggestions.
Thanks.
-Jim
N312JE
Jim "Scooter" McGrew
http://www.mit.edu/~jsmcgrew
See what's new at AOL.com and | Quote: | | http://www.matronics.com/Navigator?RV10-List |
01234
[quote][b]
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rnewman(at)lutron.com
Guest
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| Posted: Mon Oct 29, 2007 1:33 pm Post subject: Radio Static Help |
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|
Here's an issue I chased for many months in my Glastar with the com
antenna on our GNS 530. (which feeds a 340 audio panel) The coax
connector we had used was one of those "non-crimp type" which had been
just fine for 7 years. Well after some moving around after our
instrument panel overhaul the connection to the shield of the coax
stopped making but the center lead was fine. The result was chaos on
the com channel. Noise and static and really weak transmissions.
I've since changed all coax connector to the much more robust crimp
type. NO issues since. This problem was very intermittent, at some
point I was convinced it was thermally related.
-Bob Newman
| Quote: | >> rv10(at)sinkrate.com 10/29/2007 4:15 PM >>>
You did not say if you have a second COM radio but I assume you do. If
|
you
don't have static on the second COM then you might try swapping radio
position on the GMA340? Or possibly use the built in 2 place intercom
on the
sl30 temporarily bypassing the 340 altogether.
-Ben
_____
From: owner-rv10-list-server(at)matronics.com
[mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of
JSMcGrew(at)aol.com
Sent: Monday, October 29, 2007 12:34 PM
To: rv10-list(at)matronics.com
Subject: Radio Static Help
4 years ago today I placed my order for RV-10 tail kit #40134 as a
birthday
present to
myself. Now, 2500 building and 100 flying hours later, I can say it was
a
pretty nice gift
and well worth it... unfortunately I haven't got all the bugs worked
out
yet:
I've spent the last few weeks trying to track down a problem with
radio
static on my
Garmin SL-30 Nav/Comm. The SL-30 is attached to a Garmin GMA-340 Audio
panel.
The static itself sounds random (i.e. not obviously uniform like I
would
expect from an ignition
system), however, it is somehow associated with engine throttle
setting. The
static starts around 2000 RPM and gets progressively worse as throttle
increases.
On takeoff, it is so bad you can not comprehend any received
transmissions.
During cruise it appears
to be somehow associated with manifold pressure (i.e. throttle setting,
not
RPM). It makes
listening to ATC difficult to impossible. I also think it may be
affecting
my radio
transmissions as well, because when I have a hard time comprehending
ATC,
they
also have a hard time understanding me. This static appears to be only
affecting
the Comm audio, there is no static on NAV audio reception. I have a
belly
mounted
bent whip VHF antenna and a wingtip VOR antenna. My handheld ICOM VHF
radio
does not have any static when used inside the cockpit.
I have searched various lists for ideas and tried to solve this
problem, but
I have had no success in changing it at all (for better or worse). Any
suggestions for what to try or where to look will be welcome. Below is
a
list
of some things I have tried with no luck.
General
-Shut off all avionics (except SL-30) and both ignition systems (not
both at
the same time)
--So it doesn't appear to be interference from other electronics
Antenna/Coaxial cable
-Added ferrite signal filters at various locations along comm coax.
-Connected SL-30 to a different comm antenna using a piece of RG-400
(tried
various routings to antennas)
-Connected SL-30 Comm to VOR antenna (great reception, still static)
--So it doesn't appear to be antenna related
Power/ground
-Ensured engine grounding cables have good contacts on both ends
-Apparently new Slick Magnetos have internal suppression and do not
need a
filter
-Separated SL-30 power/ground leads from bundle to reduce potential
interference from other wires
-Ran SL-30 +12V and ground leads directly to battery
-Disconnected serial connection between my SL-30 and EFIS indicator
-Connected SL-30 to separate 12V battery sitting on floor of aircraft,
disconnected power/ground
to GMA-340. Attached ICOM handheld antenna directly to unit (SL-30
completely isolated
from aircraft)-reception still has static
-Ran ground wire from battery to SL-30 tray
-Checked to ensure headseat jacks were isolated from aircraft ground.
-Checked the shield connections for tachometer and fuel flow sensor
wires
I can't think of anything else to try. Again, I'd be happy to hear any
suggestions.
Thanks.
-Jim
N312JE
Jim "Scooter" McGrew
http://www.mit.edu/~jsmcgrew
_____
See what's new at AOL.com and
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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toaster73(at)embarqmail.c
Guest
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| Posted: Mon Oct 29, 2007 6:08 pm Post subject: Radio Static Help |
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|
If it still had static with the hand held antenna and just battery power , perhaps its actually an internal radio problem. Maybe you should take it in for a bench check at an avionics shop.
-CHris
#40072
[quote] ---
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billderou(at)yahoo.com
Guest
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| Posted: Mon Oct 29, 2007 6:40 pm Post subject: Radio Static Help |
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A few thoughts:
How does the intercom work within the cabin? Is there any static and does any appear with engine at cruise?
I am not familiar with the G340 but have used the G347, PS engr, etc and they default to com1 when the power to the intercom is turned off. There is a relay inside that connects the pilots ptt, one ear, and the pilot mic directly to the radio wired to com1 when power is off. This is the fall back mode. If your SL-30 is connected to com1 how is the radio quality with the G340 turned off?
The antenna test as Mr Hein suggests is very valuable. I assume the results will calculate VSWR. This test will verify the back half of the radio. Also, you could buy a DB-25 plug and both the headset plugs and create your own direct harness to the SL-30. Sit in the plane with the SL-30 in your lap and plug the headset into the test harness. It only requires 7 (or so) wires. This will check out the front half of the radio.
Good Luck,
Bill DeRouchey
N939SB, flying
Bob Newman <rnewman(at)lutron.com> wrote:
[quote]--> RV10-List message posted by: "Bob Newman"
Here's an issue I chased for many months in my Glastar with the com
antenna on our GNS 530. (which feeds a 340 audio panel) The coax
connector we had used was one of those "non-crimp type" which had been
just fine for 7 years. Well after some moving around after our
instrument panel overhaul the connection to the shield of the coax
stopped making but the center lead was fine. The result was chaos on
the com channel. Noise and static and really weak transmissions.
I've since changed all coax connector to the much more robust crimp
type. NO issues since. This problem was very intermittent, at some
point I was convinced it was thermally related.
-Bob Newman
| Quote: | >> rv10(at)sinkrate.com 10/29/2007 4:15 PM >>>
You did not say if you have a second COM radio but I assume you do. If
|
you
don't have static on the second COM then you might try swapping radio
position on the GMA340? Or possibly use the built in 2 place intercom
on the
sl30 temporarily bypassing the 340 altogether.
-Ben
_____
From: owner-rv10-list-server(at)matronics.com
[mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of
JSMcGrew(at)aol.com
Sent: Monday, October 29, 2007 12:34 PM
To: rv10-list(at)matronics.com
Subject: Radio Static Help
4 years ago today I placed my order for RV-10 tail kit #40134 as a
birthday
present to
myself. Now, 2500 building and 100 flying hours later, I can say it was
a
pretty nice gift
and well worth it... unfortunately I haven't got all the bugs worked
out
yet:
I've spent the last few weeks trying to track down a problem with
radio
static on my
Garmin SL-30 Nav/Comm. The SL-30 is attached to a Garmin GMA-340 Audio
panel.
The static itself sounds random (i.e. not obviously uniform like I
would
expect from an ignition
system), however, it is somehow associated with engine throttle
setting. The
static starts around 2000 RPM and gets progressively worse as throttle
increases.
On takeoff, it is so bad you can not comprehend any received
transmissions.
During cruise it appears
to be somehow associated with manifold pressure (i.e. throttle setting,
not
RPM). It makes
listening to ATC difficult to impossible. I also think it may be
affecting
my radio
transmissions as well, because when I have a hard time comprehending
ATC,
they
also have a hard time understanding me. This static appears to be only
affecting
the Comm audio, there is no static on NAV audio reception. I have a
belly
mounted
bent whip VHF antenna and a wingtip VOR antenna. My handheld ICOM VHF
radio
does not have any static when used inside the cockpit.
I have searched various lists for ideas and tried to solve this
problem, but
I have had no success in changing it at all (for better or worse). Any
suggestions for what to try or where to look will be welcome. Below is
a
list
of some things I have tried with no luck.
General
-Shut off all avionics (except SL-30) and both ignition systems (not
both at
the same time)
--So it doesn't appear to be interference from other electronics
Antenna/Coaxial cable
-Added ferrite signal filters at various locations along comm coax.
-Connected SL-30 to a different comm antenna using a piece of RG-400
(tried
various routings to antennas)
-Connected SL-30 Comm to VOR antenna (great reception, still static)
--So it doesn't appear to be antenna related
Power/ground
-Ensured engine grounding cables have good contacts on both ends
-Apparently new Slick Magnetos have internal suppression and do not
need a
filter
-Separated SL-30 power/ground leads from bundle to reduce potential
interference from other wires
-Ran SL-30 +12V and ground leads directly to battery
-Disconnected serial connection between my SL-30 and EFIS indicator
-Connected SL-30 to separate 12V battery sitting on floor of aircraft,
disconnected power/ground
to GMA-340. Attached ICOM handheld antenna directly to unit (SL-30
completely isolated
from aircraft)-reception still has static
-Ran ground wire from battery to SL-30 tray
-Checked to ensure headseat jacks [quote][b]
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davelammers(at)mchsi.com
Guest
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| Posted: Mon Oct 29, 2007 7:45 pm Post subject: Radio Static Help |
|
|
Jim,
Are you grounding your mag through a single conductor shielded wire, to the switch, with the ground return (mags off) through the shield, and then back to a ground location on the mag?
If not, your mag wire to the switch (with the switch open, ie: mags on) is a great antenna to radiate mag noise into the surroundings.
Dave Lammers
JSMcGrew(at)aol.com (JSMcGrew(at)aol.com) wrote: [quote] 4 years ago today I placed my order for RV-10 tail kit #40134 as a birthday present to
myself. Now, 2500 building and 100 flying hours later, I can say it was a pretty nice gift
and well worth it... unfortunately I haven't got all the bugs worked out yet:
I've spent the last few weeks trying to track down a problem with radio static on my
Garmin SL-30 Nav/Comm. The SL-30 is attached to a Garmin GMA-340 Audio panel.
The static itself sounds random (i.e. not obviously uniform like I would expect from an ignition
system), however, it is somehow associated with engine throttle setting. The
static starts around 2000 RPM and gets progressively worse as throttle increases.
On takeoff, it is so bad you can not comprehend any received transmissions. During cruise it appears
to be somehow associated with manifold pressure (i.e. throttle setting, not RPM). It makes
listening to ATC difficult to impossible. I also think it may be affecting my radio
transmissions as well, because when I have a hard time comprehending ATC, they
also have a hard time understanding me. This static appears to be only affecting
the Comm audio, there is no static on NAV audio reception. I have a belly mounted
bent whip VHF antenna and a wingtip VOR antenna. My handheld ICOM VHF radio
does not have any static when used inside the cockpit.
I have searched various lists for ideas and tried to solve this problem, but
I have had no success in changing it at all (for better or worse). Any
suggestions for what to try or where to look will be welcome. Below is a list
of some things I have tried with no luck.
General
-Shut off all avionics (except SL-30) and both ignition systems (not both at the same time)
--So it doesn't appear to be interference from other electronics
Antenna/Coaxial cable
-Added ferrite signal filters at various locations along comm coax.
-Connected SL-30 to a different comm antenna using a piece of RG-400 (tried
various routings to antennas)
-Connected SL-30 Comm to VOR antenna (great reception, still static)
--So it doesn't appear to be antenna related
Power/ground
-Ensured engine grounding cables have good contacts on both ends
-Apparently new Slick Magnetos have internal suppression and do not need a filter
-Separated SL-30 power/ground leads from bundle to reduce potential interference from other wires
-Ran SL-30 +12V and ground leads directly to battery
-Disconnected serial connection between my SL-30 and EFIS indicator
-Connected SL-30 to separate 12V battery sitting on floor of aircraft, disconnected power/ground
to GMA-340. Attached ICOM handheld antenna directly to unit (SL-30 completely isolated
from aircraft)-reception still has static
-Ran ground wire from battery to SL-30 tray
-Checked to ensure headseat jacks were isolated from aircraft ground.
-Checked the shield connections for tachometer and fuel flow sensor wires
I can't think of anything else to try. Again, I'd be happy to hear any suggestions.
Thanks.
-Jim
N312JE
Jim "Scooter" McGrew
http://www.mit.edu/~jsmcgrew
See what's new at AOL.com and | Quote: |
face="courier new,courier" size="2">http://www.matronics.com/Navigator?RV10-List
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n223rv(at)wolflakeairport
Guest
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| Posted: Tue Oct 30, 2007 5:16 am Post subject: Radio Static Help |
|
|
We had a similar issue and fixed it with adjusting the squelch. We were activating the mic with the louder engine noise on take off and at high manifold pressure. May not be the sam problem for you, but easy to check out.
-Mike
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