Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 10 Nov 2005 07:30:02 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d04.mx.aol.com ([205.188.157.36] verified) by logan.com (CommuniGate Pro SMTP 5.0.1) with ESMTP id 825403 for lml@lancaironline.net; Wed, 09 Nov 2005 18:39:18 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.36; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d04.mx.aol.com (mail_out_v38_r6.3.) id q.12a.690b94af (4328) for ; Wed, 9 Nov 2005 18:38:31 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <12a.690b94af.30a3e277@aol.com> X-Original-Date: Wed, 9 Nov 2005 18:38:31 EST Subject: Re: [LML] Re: antennae X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1131579511" X-Mailer: 9.0 Security Edition for Windows sub 5300 X-Spam-Flag: NO -------------------------------1131579511 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 11/9/2005 4:42:17 P.M. Central Standard Time, 5zq@cox.net writes: Yes the MB antenna is quite long. I don't remember exactly, let's see...a marker is 75 mhz and the speed of light is 186,000 miles per second. Soooo 186,000 miles divided by 75,000,000 is 0.00248 miles, times 5280 is 13.0944 feet. That's should be the wavelength. The antenna is, I think, a half wavelength or about 6 and a half feet or 78 inches. OK Scott, I'm counting on you to check me on this. Mine works well...very well. The problem is that you actually don't want it to work that well. You should only receive a marker signal when you're almost directly over the transmitter. With mine, I start hearing it a mile before and continue hearing it a mile after passing the marker. Way too good reception. John, Bill is correct. This time, he is correct about everything (a rare moment, I hear). I have such a foil MB antenna on the fuselage centerline glued to the floor of the fiberglass body. I pick up marker beacons all across the country - I use it as a nearest airport ILS alert. It is too good. Just report the FAF when the loudness reaches its painful peak, check the GPS moving map location or the highway in the sky indicator on your HUD. BUT, if you plan to fly mainly in the US and in reasonable IFR conditions, please note that more and more marker beacons are being unplugged. Why, just recently at my airport (KARR) on the ILS 9, the WOLFF (as in the life long airport maintenance family last name) OM was decommissioned and replaced with the radar-dependent DITCA (as in Mike Ditka, ex Bears/Saints coach) FAF. Note also that most approaches with marker beacons no longer indicate a 50 foot penalty for them being OTS. If you like RNAV/GPS approaches better (another way to get down on 9), DITCA is its FAF too. Anybody remember what an NDB is used for these days? How about radio ranging? Pilotage anyone, or are we just too fast for that? Now where did I put my sextant? Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) -------------------------------1131579511 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 11/9/2005 4:42:17 P.M. Central Standard Time,=20 5zq@cox.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Yes the=20 MB antenna is quite long. I don't remember exactly, let's see...a=20
marker is 75 mhz and the speed of light is 186,000 miles per second. S= oooo=20
186,000 miles divided by 75,000,000 is 0.00248 miles, times 5280 is=20 13.0944
feet. That's should be the wavelength. The antenna is, I think= , a=20 half
wavelength or about 6 and a half feet or 78 inches. OK Scott, I'm= =20 counting
on you to check me on this.

Mine works well...very wel= l.=20 The problem is that you actually don't want it
to work that well. You=20 should only receive a marker signal when you're
almost directly over t= he=20 transmitter. With mine, I start hearing it a mile
before and continue=20 hearing it a mile after passing the marker. Way too good=20
reception.

John,

Bill is correct. This time, he is correct about everything (a rare mome= nt,=20 I hear). I have such a foil MB antenna on the fuselage centerline glue= d to=20 the floor of the fiberglass body. I pick up marker beacons all across=20= the=20 country - I use it as a nearest airport ILS alert. It is too=20 good. Just report the FAF when the loudness reaches its= =20 painful peak, check the GPS moving map location or the highway in the s= ky=20 indicator on your HUD.

BUT, if you plan to fly mainly in the US and in reasonable IFR conditio= ns,=20 please note that more and more marker beacons are being unplugged. Why= ,=20 just recently at my airport (KARR) on the ILS 9, the WOLFF (as in the l= ife=20 long airport maintenance family last name) OM was decommissioned and=20 replaced with the radar-dependent DITCA (as in Mike Ditka, ex=20 Bears/Saints coach) FAF. Note also that most approaches with marker=20 beacons no longer indicate a 50 foot penalty for them being OTS. If yo= u=20 like RNAV/GPS approaches better (another way to get down on 9), DITCA is its= FAF=20 too.

Anybody remember what an NDB is used for these days? How about ra= dio=20 ranging? Pilotage anyone, or are we just too fast for that? Now=20 where did I put my sextant?

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

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