X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Fri, 21 Jul 2006 01:11:49 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1301278 for lml@lancaironline.net; Thu, 20 Jul 2006 21:30:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m25.mx.aol.com (mail_out_v38_r7.5.) id q.56c.228eaf3 (40522); Thu, 20 Jul 2006 21:29:52 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <56c.228eaf3.31f18810@aol.com> X-Original-Date: Thu, 20 Jul 2006 21:29:52 EDT Subject: Re: [LML] Noise and it ain't traffic! X-Original-To: lml@lancaironline.net, domcrain@tpg.com.au MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1153445392" X-Mailer: 9.0 Security Edition for Windows sub 5318 X-Spam-Flag: NO -------------------------------1153445392 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en =20 In a message dated 7/20/2006 8:01:11 P.M. Central Standard Time, =20 domcrain@tpg.com.au writes: Advice please from experts:=20 Has anyone had any radio issues using the Monroy ATD 300 poor man=E2=80=99s= TCAS,=20 with the audio lead plugged into the headset socket? =20 I have a loud(ish) squeal on radio Tx, and an expert suggested the SPA 400=20 needed changing, if the squeal disappeared with the IC switched off. It did= ,=20 and changed the SPA 400. However it still squeals.=20 Tried a little trouble shooting yesterday, and it seemed the ATD 300 audio=20 plug might be the cause, in that when removed the squeal disappeared. Howev= er=20 that was on ground engine off. The alternator is both internally and=20 externally suppressed. Dom, =20 Take a look at pdf page 16: =20 _http://www.monroyaero.com/ATD300Manual.pdf_=20 (http://www.monroyaero.com/ATD300Manual.pdf)=20 =20 And pdf page 2 =20 _http://www.sigtronics.com/air/pdf/spa-400.pdf_=20 (http://www.sigtronics.com/air/pdf/spa-400.pdf)=20 =20 It appears the tip of the Monroy is meant for a speaker (8 ohms) whilst the= =20 tip of the intercom is meant for a headphone (300 ohms). Maybe there is so= me=20 feed back or inductance mismatch. =20 =20 I have wired the specific ATD headphone output to the audio input for NAV2=20 on my TERRA audio panel and I have no feed back whether the intercom is on =20= or=20 not and whether it is switched to the speaker or headphone. Of course, it=20= is=20 hard wired at the back of the audio panel and plugged into the ATD. =20 =20 Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Abnegate Exigencies! =20 PS Not all of us know that an SPA 400 is an intercom. =20 PPS NAV2 =3D Navigation Alert, View and Veer! -------------------------------1153445392 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
In a message dated 7/20/2006 8:01:11 P.M. Central Standard Time,=20 domcrain@tpg.com.au writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3D"Times New Roman" color=3D#= 000000=20 size=3D3>

Advice please from experts:

Has anyone had any radio issues using the Monroy= ATD=20 300 poor man=E2=80=99s TCAS, with the audio lead plugged into the headset=20= socket?=20

I have a loud(ish) squeal on radio Tx, and an ex= pert=20 suggested the SPA 400 needed changing, if the squeal disappeared with the=20= IC=20 switched off. It did, and changed the SPA 400. However it still=20 squeals.

Tried a little trouble shooting yesterday, and i= t=20 seemed the ATD 300 audio plug might be the cause, in that when removed the= =20 squeal disappeared. However that was on ground engine off. The alternator=20= is=20 both internally and externally=20 suppressed.

Dom,
 
Take a look at pdf page 16:
 
http://www.monroyaero.co= m/ATD300Manual.pdf
 
And pdf page 2
 
http://www.sigtronics= .com/air/pdf/spa-400.pdf
 
It appears the tip of the Monroy is meant for a speaker (8=20 ohms) whilst the tip of the intercom is meant for a headphone (300=20 ohms).  Maybe there is some feed back or inductance mismatch. 
 
I have wired the specific ATD headphone output to the audio input=20= for=20 NAV2 on my TERRA audio panel and I have no feed back whether the intercom is= on=20 or not and whether it is switched to the speaker or headphone.  Of cour= se,=20 it is hard wired at the back of the audio panel and plugged into the=20 ATD.
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

Abnegate Exigencies!
 
PS Not all of us know that an SPA 400 is an intercom.
 
PPS NAV2 =3D Navigation=20 Alert, View and=20 Veer!
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