X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.73] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 997504 for flyrotary@lancaironline.net; Fri, 24 Feb 2006 22:32:20 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.73; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 24 Feb 2006 19:31:36 -0800 Message-ID: Received: from 4.171.114.197 by BAY115-DAV1.phx.gbl with DAV; Sat, 25 Feb 2006 03:31:31 +0000 X-Originating-IP: [4.171.114.197] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Radio noise progress Date: Fri, 24 Feb 2006 22:31:26 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C63992.0CD39880" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Fri, 24 Feb 2006 22:31:26 -0500 X-OriginalArrivalTime: 25 Feb 2006 03:31:36.0421 (UTC) FILETIME=[FB499950:01C639BB] This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C63992.0CD39880 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Can't think of any reason for the EC2 to make ticking sounds in the = radio but I'd suggest the usual trick to check. Turn it off and see if = the ticking stops. Tracy ----- Original Message -----=20 From: Bulent Aliev=20 To: Rotary motors in aircraft=20 Sent: Friday, February 24, 2006 7:40 PM Subject: [FlyRotary] Radio noise progress This morning on the way to the hangar I bought some more ceramic disk = capacitors 0.01mF as suggested. Tried them on the fan. No change. The = fan is Spal brushles I think? It has separate return line to the =20 engine case. While waiting for Jim to come with the oscilloscope, I connected =20 (temporary) the large 20A Radio Shack noise filter to filter the =20 incomming power to the avionics bus. BIG improvement! I would say 80% = reduction in fan, fuel pumps etc. noise. Jim arrived with the o.scope and we connected it to the fan. Wow! You = can see the noise. Started trying different disc capacitors I had and = they did not make any difference. Jim asked me to buy few different =20 ones at RShack and left to take care of business, but left me the =20 o.scope. After trying few capacitors, 475mF did the trick. Now the high pressure FI pumps. They were making one hell of a noise =20 filling the whole screen on the scope. The avionics filter was taking care of most of it, bit I can still =20 hear them. Went twice more to RShack for bigger and bigger =20 capacitors. Finally the 2000mF made difference on the screen, but not = enough. On the way home I stopped again in RShack and got the biggest = one they had 5000mF and hope in the morning to see a flat line on the = screen :). Next is the alternator, but had no time to run the engine today. Thanks to everybody for your suggestions. QUESTION FOR TRACY: At all times with everything else turned off =20 except master, I hear quiet noise in the headset that's like a clock =20 ticking. If I disconnect the antenna from the radio it stops. I was =20 wandering if there is something in the EC that maybe doing this? Buly -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_000E_01C63992.0CD39880 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Can't think of any reason for the EC2 to make ticking sounds in the = radio=20 but I'd suggest the usual trick to check. Turn it off and see if = the=20 ticking stops.

Tracy

----- Original Message -----

From: Bulent Aliev

To: Rotary motors in = aircraft

Sent: Friday, February 24, 2006 = 7:40=20 PM

Subject: [FlyRotary] Radio = noise=20 progress

This morning on the way to the hangar I bought some = more=20 ceramic disk
capacitors 0.01mF as suggested. Tried them on = the fan.=20 No change. The
fan is Spal brushles I think? It has separate = return=20 line to the
engine case.
While waiting for Jim to come = with the=20 oscilloscope, I connected
(temporary) the large 20A Radio = Shack=20 noise filter to filter the
incomming power to the avionics = bus. BIG=20 improvement! I would say 80%
reduction in fan, fuel pumps = etc.=20 noise.
Jim arrived with the o.scope and we connected it to the fan. = Wow!=20 You
can see the noise. Started trying different disc = capacitors I=20 had and
they did not make any difference. Jim asked me to = buy few=20 different
ones at RShack and left to take care of business, = but left=20 me the
o.scope. After trying few capacitors, 475mF did the=20 trick.
Now the high pressure FI pumps. They were making one hell of = a=20 noise
filling the whole screen on the scope.
The avionics = filter=20 was taking care of most of it, bit I can still
hear them. = Went twice=20 more to RShack for bigger and bigger
capacitors. Finally the = 2000mF=20 made difference on the screen, but not
enough. On the way = home I=20 stopped again in RShack and got the biggest
one they had = 5000mF and=20 hope in the morning to see a flat line on the
screen = :).
Next is=20 the alternator, but had no time to run the engine today.
Thanks to=20 everybody for your suggestions.

QUESTION FOR TRACY: At all = times with=20 everything else turned off
except master, I hear quiet noise = in the=20 headset that's like a clock
ticking. If I disconnect the = antenna=20 from the radio it stops. I was
wandering if there is = something in=20 the EC that maybe doing=20 this?
Buly

--
Homepage: http://www.flyrotary.com/
Archi= ve and=20 UnSub: http://mail.lanca= ironline.net/lists/flyrotary/

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