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special4
Joined: 27 Sep 2006
Posts: 28
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 Posted: Sat Aug 29, 2009 6:31 am Post subject: Groundblock Tube/Fabric Airplane |
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I have problems with static noise/interference (Icom IC A5 Radio) on my Challenger I Ultralight. Battery is in the nose (ground to the aluminum frame tube), antenna on left wing (strut mount) and engine (2-stroke Rotax 447, sparkplug wires shielded and resistor spark plug caps) is behind the wing (pusher) What is the best place to install a groundblock ...? Is aluminum tubing/frame a good ground...??
Thanks
Peter
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nuckolls.bob(at)aeroelect
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| Posted: Sat Aug 29, 2009 9:04 am Post subject: Groundblock Tube/Fabric Airplane |
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At 09:31 AM 8/29/2009, you wrote:
| Quote: |
I have problems with static noise/interference (Icom IC A5 Radio) on
my Challenger I Ultralight. Battery is in the nose (ground to the
aluminum frame tube), antenna on left wing (strut mount) and engine
(2-stroke Rotax 447, sparkplug wires shielded and resistor spark
plug caps) is behind the wing (pusher) What is the best place to
install a groundblock ...? Is aluminum tubing/frame a good ground...??
|
The groundblock is what "becomes a good ground" irrespective
of where mounted and on what kind of airplane. Are you
certain that your noises originate from poor ground
architecture?
The A5 is a hand held. Are you using internal batteries
or external power cord? What is the nature of your "static".
Are you certain that it's ignition noise? Is the noise so
strong that it prevents you from hearing the transmission of
others . . . or can you tighten the squelch control to shut
off the noise and still hear others when they talk?
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
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special4
Joined: 27 Sep 2006
Posts: 28
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| Posted: Sat Aug 29, 2009 9:31 am Post subject: Re: Groundblock Tube/Fabric Airplane |
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I can hear loud and clear over 70 miles distance, but when I transmit there is a lot of noise.... (unicom and other airplanes report a lot of static and background noise) The radio is connected to the "ships" power, and I did try it with the internal batteries only, but with the same results. Could it be a ground loop...as I do not have connected all the wires to "one" ground....???
Thanks
Peter
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r.r.hall(at)cox.net
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| Posted: Sat Aug 29, 2009 10:52 am Post subject: Groundblock Tube/Fabric Airplane |
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Since it is a handheld could you conduct a few tests such as using it without the aircraft on or completely outside the aircraft?
Find a frequency unused in your area and you and a friend try a few transmissions with the engine off and maybe even outside the plane with the portable antenna. If the noise goes away you know it is coming from the installation if it is still there it is in the radio itself. Then try with it attached to the ships antenna but the ship off etc, Introduce one element at a time until the static comes in and then deal with the cause.
Rodney
---- "Robert L. Nuckolls wrote:
| Quote: |
At 09:31 AM 8/29/2009, you wrote:
>
>
>I have problems with static noise/interference (Icom IC A5 Radio) on
>my Challenger I Ultralight. Battery is in the nose (ground to the
>aluminum frame tube), antenna on left wing (strut mount) and engine
>(2-stroke Rotax 447, sparkplug wires shielded and resistor spark
>plug caps) is behind the wing (pusher) What is the best place to
>install a groundblock ...? Is aluminum tubing/frame a good ground...??
The groundblock is what "becomes a good ground" irrespective
of where mounted and on what kind of airplane. Are you
certain that your noises originate from poor ground
architecture?
The A5 is a hand held. Are you using internal batteries
or external power cord? What is the nature of your "static".
Are you certain that it's ignition noise? Is the noise so
strong that it prevents you from hearing the transmission of
others . . . or can you tighten the squelch control to shut
off the noise and still hear others when they talk?
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
|
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nuckolls.bob(at)aeroelect
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| Posted: Sat Aug 29, 2009 2:04 pm Post subject: Groundblock Tube/Fabric Airplane |
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At 12:31 PM 8/29/2009, you wrote:
| Quote: |
I can hear loud and clear over 70 miles distance, but when I
transmit there is a lot of noise.... (unicom and other airplanes
report a lot of static and background noise) The radio is connected
to the "ships" power, and I did try it with the internal batteries
only, but with the same results. Could it be a ground loop...as I do
not have connected all the wires to "one" ground....???
|
As Rodney has suggested, you need to isolate the potential
ingress of noise upon your signal. Your intial posting
didn't mention a difference between hearing and talking,
now we know that the problem manifests only while you're
talking and the noise is not coming in through the
power leads.
Now we have to deduce what other folks are referring
to as "static and background noise". It's and interesting
and sometimes frustrating task to acquire accurate mental
images of the meanings for other people's words. Back in
my active ham radio days, we learned early on what the
various common noise sources sounded like and could accurately
differentiate wind noise, background sounds, generator or
regulator hash, ignition noise, blower motor brush noise
and alternator whine . . . none of which were referred to
as "static". Static is that stuff that you hear when
lightning strikes somewhere and is almost NEVER a part
of anyone's actual transmitted signal.
Okay, what microphone are you using when the noise
complaint is raised? Built in microphones on hand-
helds are one step above the mic that came with my
two-year old grandson's Karaoke by Mattel. They
never have effective noise cancelling nor tightly
controlled pressure sensitivity patterns. So an
aircraft headset with a good noise cancelling microphone
is called for . . . PARTICULARLY if you like
to fly with the "air conditioning" on . . .
If you've already got a head-set, is it one that
has been successfully used in an environment such
as your cockpit? I got a really cool ride in a
Trike . . .
http://aeroelectric.com/Pictures/Misc/Trike_Ride_1.jpg
Thanks Rich!
By the way, this is the platform from which I
acquired the website cover shot of K1K1, the
airport Dr. Dee and I owned for a time.
http://aeroelectric.com/23a.jpg
Unfortunately, the LEAST expensive airplanes
demand the very best in microphone performance
for pleasant and understandable conversation.
Bob . . .
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special4
Joined: 27 Sep 2006
Posts: 28
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| Posted: Sun Aug 30, 2009 5:35 am Post subject: Re: Groundblock Tube/Fabric Airplane |
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Thanks Bob, thanks Rodney,
I will do the tests as you are recommending, and try to isolate the noise.
Re headsets; I have 2 headsets, one is a PNR and the 2nd one is a ANR. With the ANR headset I could hear the rpm changes , but after I have installed the sparkplugwire shielding that noise is gone.
Peter
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