X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from blu0-omc2-s17.blu0.hotmail.com ([65.55.111.92] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3898085 for flyrotary@lancaironline.net; Sat, 24 Oct 2009 13:59:48 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.55.111.92; envelope-from=neilak@sympatico.ca Received: from BLU0-SMTP83 ([65.55.111.73]) by blu0-omc2-s17.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Sat, 24 Oct 2009 10:59:12 -0700 X-Originating-IP: [76.69.4.164] X-Originating-Email: [neilak@sympatico.ca] Message-ID: Return-Path: neilak@sympatico.ca Received: from NeilPC ([76.69.4.164]) by BLU0-SMTP83.blu0.hotmail.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Sat, 24 Oct 2009 10:59:11 -0700 From: "Neil Kruiswyk" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Sam Hodges Update Date: Sat, 24 Oct 2009 13:59:03 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0013_01CA54B2.25984B10" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7600.16385 Thread-Index: AcpUycVftAWvAf+9Qqq3F+60uKfo5QAB3tiw X-OriginalArrivalTime: 24 Oct 2009 17:59:12.0189 (UTC) FILETIME=[B13D2ED0:01CA54D3] This is a multi-part message in MIME format. ------=_NextPart_000_0013_01CA54B2.25984B10 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Doug, Measuring DC resistance on the output BNC connector of the radio may in fact show a dead short. It all depends on the electronic design of the radio. Some designs have an inductor (coil) on the output pin to ground which would show as a DC short, but that would be normal. Check the output power of the radio with an in-line power meter (Byrd watt meter or similar) and check the SWR as well. If you don't have the equipment your local radio shop will have it (or a ham radio friend). RF from a perfectly working comm radio can bother the EC2 and or EM2/3. Close attention on shielding and grounding of the EC2 - EM2/3 and its wiring is a must. As a second test, get a handheld comm and transmit while in the cockpit with the engine running. Wave the handheld around in the cockpit while transmitting. If you've got shielding problems, the handheld will bother the EC2 as well as the panel mount radio. Neil Pilot and Ham radio nerd. _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com Sent: October-24-09 12:47 PM To: Rotary motors in aircraft Subject: [FlyRotary] Sam Hodges Update After a weeks vacation from work and the plane I came home with a fresh mind and discovered a direct short to ground from the coax center conductor to the radio case. A bad radio right out of the box". We should be hearing about a first flight in the next few months! Doug ------=_NextPart_000_0013_01CA54B2.25984B10 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Doug,

 

      =       Measuring DC resistance on the output BNC connector of the radio may in fact show = a dead short.  It all depends on the electronic design of the radio.  = Some designs have an inductor (coil) on the output pin to ground which would = show as a DC short, but that would be normal.  Check the output power of = the radio with an in-line power meter (Byrd watt meter or similar) and check the = SWR as well.  If you don’t have the equipment your local radio shop = will have it (or a ham radio friend).

 

      =       RF from a perfectly working comm radio can bother the EC2 and or = EM2/3.  Close attention on shielding and grounding of the EC2 – EM2/3 and = its wiring is a must. 

 

      =       As a second test, get a handheld comm and transmit while in the cockpit = with the engine running.  Wave the handheld around in the cockpit while transmitting.  If you’ve got shielding problems, the handheld = will bother the EC2 as well as the panel mount = radio.

 

Neil

Pilot and Ham radio = nerd.

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com
Sent: October-24-09 12:47 = PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Sam = Hodges Update

 

<snip>  =  After a weeks vacation from work and the plane I came = home with a fresh mind and discovered a direct short to ground from the coax = center conductor to the radio case. A bad radio right out of the = box".

 

=

We should be hearing about a first = flight in the next few months!

 

=

Doug

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