X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1063054 for flyrotary@lancaironline.net; Sun, 09 Apr 2006 08:13:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.73; envelope-from=atlasyts@bellsouth.net Received: from ibm69aec.bellsouth.net ([65.11.149.236]) by imf25aec.mail.bellsouth.net with ESMTP id <20060409121245.UDLU15312.imf25aec.mail.bellsouth.net@ibm69aec.bellsouth.net> for ; Sun, 9 Apr 2006 08:12:45 -0400 Received: from [192.168.0.100] (really [65.11.149.236]) by ibm69aec.bellsouth.net with ESMTP id <20060409121244.VAQB905.ibm69aec.bellsouth.net@[192.168.0.100]> for ; Sun, 9 Apr 2006 08:12:44 -0400 Mime-Version: 1.0 (Apple Message framework v749.3) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-17-921357231 Message-Id: <2CA56B47-8A74-409D-BABF-F29B433F812D@bellsouth.net> From: Bulent Aliev Subject: Re: [FlyRotary] Radio Sage - EM2 - a Strange Twist Date: Sun, 9 Apr 2006 08:13:18 -0400 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.749.3) --Apple-Mail-17-921357231 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes; format=flowed Joe, while i was hunting down the noises of my system with =20 osciloscope, I discovered that one of my rudder cables was grounded, =20 and the other was not. The one that was not grounded was radiating =20 radio noise. The moment i grounded it it went flat line on the scope. =20= I also grounded all my control cable torque tubes, since some were, =20 and some were not grounded. I know that the injector wires are transmitting some electromagnetic =20 field constantly, since my vertical compass was dancing like mad. I =20 had to find a different place for it. It is a "black art" for people =20 like us, but you'll stumble eventualy on the cause. It took me a =20 month with the help of electronics engineers, people on the list and =20 oscilloscope. Buly On Apr 9, 2006, at 1:02 AM, Joe Hull wrote: > Today I spent most of the day with my EAA flight advisor =96 much of =20= > it was up in his Long-EZ doing drills for my first flight =96 which I =20= > was hoping to be this next week. However, after that I spent a =20 > couple of hours in the hanger puzzling over the radio static that =20 > only appears when the engine is running AND the mic is keyed (note =20 > =96 no / little noise on incoming broadcasts whether the engine is =20 > running or not). > > > > It was windy and rainy this afternoon and I wasn=92t able to get the =20= > plane out of the hanger for an engine run so I thought I=92d double =20= > check grounds and shielding etc. At some point I had the bright or =20= > not so bright idea to use my handheld ICOM to see if there was any =20 > radiated signal from the coils or anything else when the engine was =20= > not running that might intensify when the engine is running. A =20 > very interesting phenomena soon appeared related directly to the =20 > EM-2. When the EM-2 is powered on anything attached to grounded =20 > metal (remember I have a plastic airplane and thus well defined =20 > ground paths) radiates a static noise on the handheld. For example =20 > within about 18=94 of the engine I=92ll get static; or if I go halfway = =20 > down the wing and sweep it over the wing I will get static when it =20 > passes over the part that contains the rudder cable. If I pull the =20 > fuse on the EM-2 I get no static anywhere =96 not even when I key the =20= > mic. I unplugged P1 and P2 plugs (sensor inputs) from the EM-2 and =20= > still had static =96 only get static when there is power to the EM-2. > > HOWEVER, again, I wasn=92t able to run the engine so I don=92t know if = =20 > the static is gone with the engine running and the EM-2 is =20 > disconnected. > > > > Joe Hull > > Cozy Mk-IV #991 (Done Building! In Phase1 Flight Test - 0 hrs flown) > > Redmond (Seattle), Washington > > --Apple-Mail-17-921357231 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=WINDOWS-1252 Joe, while i was hunting down = the noises of my system with osciloscope, I discovered that one of my = rudder cables was grounded, and the other was not. The one that was not = grounded was radiating radio noise. The moment i grounded it it went = flat line on the scope. I also grounded all my control cable torque = tubes, since some were, and some were not grounded.=A0
I know that = the injector wires are transmitting some electromagnetic field = constantly, since my vertical compass was dancing like mad. I had to = find a different place for it. It is a "black art" for people like us, = but you'll stumble eventualy on the cause. It took me a month with the = help of electronics engineers, people on the list and = oscilloscope.

=

On Apr 9, 2006, at 1:02 AM, Joe Hull wrote:

Today I spent most of the day with my EAA flight advisor =96 = much of it was up in his Long-EZ doing drills for my first flight =96 = which I was hoping to be this next week. However, after that I spent a = couple of hours in the hanger puzzling over the radio static that only = appears when the engine is running AND the mic is keyed (note =96 no / = little noise on incoming broadcasts whether the engine is running or = not).=A0

It was windy and rainy this afternoon and I = wasn=92t able to get the plane out of the hanger for an engine run so I = thought I=92d double check grounds and shielding etc. =A0At some point I = had the bright or not so bright idea to use my handheld ICOM to see if = there was any radiated signal from the coils or anything else when the = engine was not running that might intensify when the engine is running.=A0= A very interesting phenomena soon appeared related directly to the = EM-2.=A0 When the EM-2 is powered on anything attached to grounded metal = (remember I have a plastic airplane and thus well defined ground paths) = radiates a static noise on the handheld. For example within about 18=94 = of the engine I=92ll get static; or if I go halfway down the wing and = sweep it over the wing I will get static when it passes over the part = that contains the rudder cable. If I pull the fuse on the EM-2 I get no = static anywhere =96 not even when I key the mic.=A0 I unplugged P1 and = P2 plugs (sensor inputs) from the EM-2 and still had static =96 only get = static when there is power to the EM-2.

HOWEVER, again, I wasn=92t able to run the = engine so I don=92t know if the static is gone with the engine running = and the EM-2 is disconnected.=A0

=A0

Joe Hull

Cozy Mk-IV #991 (Done Building! In Phase1 Flight = Test - 0 hrs flown)

Redmond (Seattle), = Washington


= --Apple-Mail-17-921357231--