Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 14 Mar 2003 11:07:16 -0500 Message-ID: X-Original-Return-Path: Received: from imo-r03.mx.aol.com ([152.163.225.99] verified) by logan.com (CommuniGate Pro SMTP 4.0.6) with ESMTP id 2052693 for lml@lancaironline.net; Fri, 14 Mar 2003 11:00:07 -0500 Received: from Sky2high@aol.com by imo-r03.mx.aol.com (mail_out_v34.21.) id q.159.1d1b54d7 (3842) for ; Fri, 14 Mar 2003 10:59:59 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <159.1d1b54d7.2ba3567f@aol.com> X-Original-Date: Fri, 14 Mar 2003 10:59:59 EST Subject: Re: [LML] LNC2 RFI filter for temperature sensor leads? X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_159.1d1b54d7.2ba3567f_boundary" X-Mailer: 8.0 for Windows sub 840 --part1_159.1d1b54d7.2ba3567f_boundary Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable In a message dated 3/11/2003 2:56:53 PM Central Standard Time,=20 vision_micro@hotmail.com writes: > There should be no effect on the EGT/CHT, however in some cases, depending= =20 > on transmitter com cable routing etc, especially with composite airframes,= =20 > there may be RFI strength sufficient to affect the OAT/CAT/OIL probes.=20 Verrrrry Interrrrresting! David, First, thank you very much for the reply.=A0 Let me clarify the conditions I have a Lancair 320 slow build kit, circa 1989, first flight 1996.=A0 I hav= e=20 an EPI 800 system, including hardware updates that include board changes=20 necessary for understanding rpm signals generated by LASAR double-magnet=20 mags.=A0 I have flown with Terra com radios and Garmin 430 com. I do have an= =20 S-Tec 50 A/P.=A0 Com antenna cable routing is thru a comant switch down the=20 panel and towards the rear as the antenna is in the vertical stab.=A0 The=20 engine instrumentation is in the front (with the engine) and the OAT probe i= s=20 located in the right wing flap fillet. Every temperature sensor is affected during comm transmit - CHT, EGT, OAT,=20 CAT and OIL.=A0 I have lived with this for years.=A0 The more difficult prob= lem=20 is the CHT warning (cyl is cooling too fast) and flashing red light during a= =20 request to ATC.=A0 Indeed, I do enter a slight dive when altitude hold is=20 engaged (S-Tec 50) and I have keyed the mike to report that I am "level" at=20 some altitude.=A0 My Rocky Mountain Instruments Micro-encoder OAT probe is n= ot=20 affected because it uses a thermistor. A friend with a Cozy Mk IV has a similar problem with his VM 1000 system.= =A0=20 Note that his antenna/wiring/engine location are quite a bit different than=20 mine.=A0 Because his engine compartment is exposed at this time, we will be=20 experimenting with your recommended solution to the oil temp problem - this=20 will not solve our problem with other temp probes. Note that I contacted two friends with Lancair 360s/VM1000s and neither has=20= a=20 problem with any temperature probe.=A0 Another with an ES and Electronics=20 International system also see temps go cold during transmit. To anyone out there with possible solutions - HELP! Scott Krueger N92EX PS RG 58 coax sucks! PPS: This was also sent directly to David. --part1_159.1d1b54d7.2ba3567f_boundary Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable In a message dated 3/11/2003 2:56:53 PM Central Standa= rd Time, vision_micro@hotmail.com writes:

There should be no effect on th= e EGT/CHT, however in some cases, depending
on transmitter com cable routing etc, especially with composite airframes, <= BR> there may be RFI strength sufficient to affect the OAT/CAT/OIL probes.

Verrrrry Interrrrresting!

David,

First, thank you very much for the reply.=A0 Let me clarify the conditions
I have a Lancair 320 slow build kit, circa 1989, first flight 1996.=A0 I hav= e an EPI 800 system, including hardware updates that include board changes n= ecessary for understanding rpm signals generated by LASAR double-magnet mags= .=A0 I have flown with Terra com radios and Garmin 430 com. I do have an S-T= ec 50 A/P.=A0 Com antenna cable routing is thru a comant switch down the pan= el and towards the rear as the antenna is in the vertical stab.=A0 The engin= e instrumentation is in the front (with the engine) and the OAT probe is loc= ated in the right wing flap fillet.

Every temperature sensor is affected during comm transmit - CHT, EGT, OAT, C= AT and OIL.=A0 I have lived with this for years.=A0 The more difficult probl= em is the CHT warning (cyl is cooling too fast) and flashing red light durin= g a request to ATC.=A0 Indeed, I do enter a slight dive when altitude hold i= s engaged (S-Tec 50) and I have keyed the mike to report that I am "level" a= t some altitude.=A0 My Rocky Mountain Instruments Micro-encoder OAT probe is= not affected because it uses a thermistor.

A friend with a Cozy Mk IV has a similar problem with his VM 1000 system.= =A0 Note that his antenna/wiring/engine location are quite a bit different t= han mine.=A0 Because his engine compartment is exposed at this time, we will= be experimenting with your recommended solution to the oil temp problem - t= his will not solve our problem with other temp probes.

Note that I contacted two friends with Lancair 360s/VM1000s and neither has=20= a problem with any temperature probe.=A0 Another with an ES and Electronics=20= International system also see temps go cold during transmit.

To anyone out there with possible solutions - HELP!

Scott Krueger
N92EX

PS RG 58 coax sucks!

PPS: This was also sent directly to David.

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