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n801bh(at)NetZero.com
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 Posted: Fri Nov 23, 2007 6:36 am Post subject: Ps Engineering intercom noise |
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Guys, I have a Ps 1000ll in my experimental and it has worked flawlessly for three years. On my last couple of flights there is an annoying noise when i use the intercom between the pilot and co pilot. Some facts..
The plane is quite noisy. mostly due to the V-8 Ford up front. ya it has mufflers but...
When I call ATC they say my transmissions are clear and noise free.
This only happens at high noise levels in the cockpit, on the ground or throttled back the intercom works great.
I use Lightspeed 20-3G's for headphones and it happens with ANR either on or off.
Any ideas guys???
Ben Haas
N801BH
www.Haaspowerair.com
-Matt Dralle, List Admi========================; - The AeroElectric-List Email=============================================================================================
[quote][b]
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ceengland(at)bellsouth.ne
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| Posted: Fri Nov 23, 2007 11:01 am Post subject: Ps Engineering intercom noise |
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n801bh(at)netzero.com wrote:
| Quote: | Guys, I have a Ps 1000ll in my experimental and it has worked flawlessly
for three years. On my last couple of flights there is an annoying noise
when i use the intercom between the pilot and co pilot. Some facts..
The plane is quite noisy. mostly due to the V-8 Ford up front. ya it has
mufflers but...
When I call ATC they say my transmissions are clear and noise free.
This only happens at high noise levels in the cockpit, on the ground or
throttled back the intercom works great.
I use Lightspeed 20-3G's for headphones and it happens with ANR either
on or off.
Any ideas guys???
Ben Haas
N801BH
www.Haaspowerair.com <http://www.Haaspowerair.com>
What is the nature of the 'annoying noise'? Is it electronic in nature,
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or just very loud airplane noise?
This might not be relevant, but what's the condition of the ear pads on
the Lightspeeds? If the slick-feeling 'skins' on the ear muffs (at least
on my older 15XL's) are cracked and/or peeling, it totally destroys the
noise reduction ability of the headset.
Charlie
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n801bh(at)NetZero.com
Guest
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| Posted: Fri Nov 23, 2007 2:34 pm Post subject: Ps Engineering intercom noise |
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It is very loud airplane noise, as if the mics are picking up cabin sounds, I am going to crawl under the panel this afternoon and check connections... Thanks for responding..
Ben Haas
N801BH
www.haaspowerair.com
-- Charlie England <ceengland(at)bellsouth.net> wrote:
--> AeroElectric-List message posted by: Charlie England <ceengland(at)bellsouth.net>
n801bh(at)netzero.com wrote:
| Quote: | Guys, I have a Ps 1000ll in my experimental and it has worked flawlessly
for three years. On my last couple of flights there is an annoying noise
when i use the intercom between the pilot and co pilot. Some facts..
The plane is quite noisy. mostly due to the V-8 Ford up front. ya it has
mufflers but...
When I call ATC they say my transmissions are clear and noise free.
This only happens at high noise levels in the cockpit, on the ground or
throttled back the intercom works great.
I use Lightspeed 20-3G's for headphones and it happens with ANR either
on or off.
Any ideas guys???
Ben Haas
N801BH
www.Haaspowerair.com <http://www.Haaspowerair.com>
What is the nature of the 'annoying noise'? Is it electronic in nature,
|
or just very loud airplane noise?
This might not be relevant, but what's the condition of the ear pads on
the Lightspeeds? If the slick-feeling 'skins' on the ear muffs (at least
on my older 15XL's) are cracked and/or peeling, it totally destroys the
noise reduction ability of the ===============================================sp; &nb================================================-= --> http://www.matronics.com/Navigator?AeroElectric-========================; - MAT============================================================
[quote][b]
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nuckolls.bob(at)cox.net
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| Posted: Fri Nov 23, 2007 10:16 pm Post subject: Ps Engineering intercom noise |
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At 10:26 PM 11/23/2007 +0000, you wrote:
| Quote: | It is very loud airplane noise, as if the mics are picking up cabin
sounds, I am going to crawl under the panel this afternoon and check
connections... Thanks for responding..
|
As I recall, PS engineering's products feature an
automatic squelch system that differentiates between
ambient noise and human speech. Most older intercoms
have a pilot adjustable squelch that needs resetting
between say ground ops and cruising flight.
If you're hearing "cabin noise" and your intercom
doesn't have a manual noise squelch adjustment, then
it may be that this portion of the intercom's
circuitry has failed.
Bob . . .
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klehman(at)albedo.net
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| Posted: Sat Nov 24, 2007 5:29 am Post subject: Ps Engineering intercom noise |
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FWIW... Unless it has signal processing, I'd expect the same noise on
the radio as on the intercom though once the squelch opens. Presumably
you've tried rotating the Lightspeed mic? My lightspeed mic has a
tendancy to rotate and if left too long, the noise cancelling goes to
pot and you can even find yourself speaking into the backside of the mic
which is very noisy. Next I'd be tempted to reduce the mic gain a bit
if you have an adjustment screw on the mic as per my 15XL. As a wild
guess, since many intercoms use a mechanical relay to switch between
intercom and radio it might even be possible that the relay contacts are
noisy (dirty). If that were the case, on my particular intercom it would
only affect the pilot or the passenger, not both as they each have a
different relay.
The intercom that I use (different manuafacturer) does have signal
processing for the intercom but not the radio. It transmits whatever
background ambient noise that the mic does not cancel but the signal
processing eliminates that noise when using the intercom.
Ken
Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)cox.net>
At 10:26 PM 11/23/2007 +0000, you wrote:
> It is very loud airplane noise, as if the mics are picking up cabin
> sounds, I am going to crawl under the panel this afternoon and check
> connections... Thanks for responding..
As I recall, PS engineering's products feature an
automatic squelch system that differentiates between
ambient noise and human speech. Most older intercoms
have a pilot adjustable squelch that needs resetting
between say ground ops and cruising flight.
If you're hearing "cabin noise" and your intercom
doesn't have a manual noise squelch adjustment, then
it may be that this portion of the intercom's
circuitry has failed.
Bob . . .
|
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n801bh(at)NetZero.com
Guest
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| Posted: Sat Nov 24, 2007 5:53 am Post subject: Ps Engineering intercom noise |
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First of all I want to say a BIG thanks to all who have responded. Here's the scenerio. I took the beast up for a pre test flight. As I was getting ready I plugged in the pilot side headphones. The speaker plug went in with no problem, as I plugged in the smaller mic plug I got alot of static. Wiggled it and nothing seems to change ,,still scatchy noise. Flew the plane and noise issue was present. Rolled it back into its hangar, crawled under the panel, removed the connector in the back of the intercom, looked very carefully at the pins and sockets. They all looked good so I Plugged it back in. Did the pilot side replug in and this time no scratchy noise, flew it and the intercom worked perfectly. Landed and rolled it back in, crawled back under the panel,let me add at this time I can tell I am getting old because once under there I forgot what all could start hurting, <G>. Removed the plug again, applied some contact cleaner and some dielectric grease with a small Qtip. Plugged it back together and flew the heck out of it, positiveG's negativeG's, a good "firm" landing and so far, knock on wood it is back to its old great working condition. My gut feeling is it was a intermitant ground issue... Thanks again to all who chime in. This experimental community and Bob and others are the BEST . !!!!!!! I am not going to do _ _ _ archive this because this might happen to someone else and they can search this topic.
Safe flyin guys
Ben Haas
N801BH
www.haaspowerair.com
-- "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net> wrote:
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net>
At 10:26 PM 11/23/2007 +0000, you wrote:
| Quote: | It is very loud airplane noise, as if the mics are picking up cabin
sounds, I am going to crawl under the panel this afternoon and check
connections... Thanks for responding..
|
As I recall, PS engineering's products feature an
automatic squelch system that differentiates between
ambient noise and human speech. Most older intercoms
have a pilot adjustable squelch that needs resetting
between say ground ops and cruising flight.
If you're hearing "cabin noise" and your intercom
doesn't have a manual noise squelch adjustment, then
it may be that this portion of the intercom's
circuitry has failed.
[quote][b]
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http://www.matronics.com/Navigator?AeroElectric-List |
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