Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Tue, 18 May 2004 10:41:10 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m22.mx.aol.com ([64.12.137.3] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3238892 for lml@lancaironline.net; Tue, 18 May 2004 10:39:16 -0400 Received: from Sky2high@aol.com by imo-m22.mx.aol.com (mail_out_v37_r1.3.) id q.1d4.21d20bf8 (25508) for ; Tue, 18 May 2004 10:39:12 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <1d4.21d20bf8.2ddb7a10@aol.com> X-Original-Date: Tue, 18 May 2004 10:39:12 EDT Subject: Re: [LML] Re: ACK ELT trips with COM2 transmit X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1084891152" X-Mailer: 9.0 for Windows sub 5028 -------------------------------1084891152 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en In a message dated 5/17/2004 7:59:46 PM Central Daylight Time,=20 jlbk@crestviewcable.com writes: Just got back from CA (to central Oregon) and read the emails pertaining to the ELT trip problem. On my last trip to Davis, CA when handed over to Oakland Ctr from Seattle, (134.2) I think, I keyed the Xmitter of COM1 (SL 30) and the ELT tripped. Same thing the next day with NorCal aprch on 132.XXX. I only had about 50 hrs on my ES and this was probably the first time I used a freg. above 130.XXX. The problem had not occurred before. I later verified it only happens at the higher frequencies. I talked to the tech people at ACK and they gave me the same story about the Bob Archer antennas. I too am a EE but have no experience with RF stuff. Still, I feel I'm getting the old "blame the other guy" story from ACK. If anyone on the list can shed some light on this problem, it would be much appreciated. Leon=20 Leon, I sent the following to Dan (private Communication) recently. What is your=20 ELT mod level. >>>>>>>>>>>>> In a message dated 5/13/2004 7:41:08 PM Central Daylight Time,=20 olsen25@comcast.net writes: A little more about my setup. COM1 (UPS SL30) connected to Bob Archer SA-008 antenna in the vertical tail=20 COM2 (UPS GX60 GPS/COM) connected to Bob Archer SA-006 antenna on right side= =20 of fuselage behind baggage area bulkhead.=20 ACK E-01 ELT mounted on left side of fuselage behind baggage bulkhead. ELT=20 antenna is copper foil antenna with torroids as per Bob Nuckolls=E2=80=99 Ae= roElectric=20 Connection. Antenna mounted on seatback bulkhead. ELT remote control in=20 instrument panel and fed with the supplied telephone wire.=20 No antenna splitters anywhere =E2=80=93 each radio has its own dedicated ant= enna=20 RG-400 coax everywhere=20 Dan, Even if you have 2 antennas, when you transmit on one, the other should be=20 disconnected from the unused radio. This may explain the loss of a radio,=20 especially if com1 and 2 are set to the same frequency. Antennas in proximity may certainly interact in supressing or resonating=20 certain frequencies. Does your ELT fire only at certain com2 frequencies? =20 Remember that early Garmin panel Mount GPS's requires a specific filter on t= he com=20 antenna lines to supress harmonics of about 12 com frequencies (one of which= =20 was my airport's ground frequency), that disrupted the GPS operation. The following is the letter I sent to ACK with my ELT: <<<<<<<<<<<<<<<< To: ACK Technologies Inc 424 West Julian Street San Jose, CA 95110 =20 408-287-8021 =20 From: Scott Krueger 305 Oak Brook Road Oak Brook, IL 60523 =20 630-561-0400 =20 Date: 4 April 2001 =20 Re: RMF induced activation of ACK ELT Model E-01 =20 Sirs: =20 I talked to Mike on 2 April about my problem with Garmin 430 radio=20 transmissions triggering the ELT which is connected to an ELT exclusive use=20= comm antenna=20 about 6 feet from the transmitting antenna in a Lancair 320. He gave me som= e=20 procedures to isolate the problem and also mentioned that ACK E-01" =19"s we= re=20 more resistant to this RMF induced activation if they were at the Mod 1 leve= l.=20 He also said if mine was not at that level, I should send it in to receive=20 the free update. Therefore, I have enclosed the ELT for modification. =20 Thanks, Scott Krueger >>>>>>>>>>>>>>>>>>>>> =20 Good Luck! =20 Scott Krueger Almost like I'm on VACATION.=20 =20 =20 -------------------------------1084891152 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
In a message dated 5/17/2004 7:59:46 PM Central Daylight Time, jlbk@cre= stviewcable.com writes:
Just got back from CA (to central Oregon) and=20= read the emails pertaining to
the ELT trip problem.  On my last trip= to Davis, CA when handed over to
Oakland Ctr from Seattle, (134.2) I thi= nk, I keyed the Xmitter of COM1 (SL
30) and the ELT tripped.  Same t= hing the next day with NorCal aprch on
132.XXX.  I only had about 50= hrs on my ES and this was probably the first
time I used a freg. above 1= 30.XXX.  The problem had not occurred before.  I
later verified= it only happens at the higher frequencies.
I talked to the tech people a= t ACK and they gave me the same story about the
Bob Archer antennas. = ; I too am a EE but have no experience with RF stuff.
Still, I feel I'm g= etting the old "blame the other guy" story from ACK.
If anyone on the lis= t can shed some light on this problem, it would be much
appreciated.
L= eon
Leon,
 
I sent the following to Dan (private Communication) recently.  Wha= t is your ELT mod level.
 
>>>>>>>>>>>>>
In a message dated 5/13/2004 7:41:08 PM Central Daylight Time, olsen25@= comcast.net writes:

A little more about my setup.

  • COM1 (UPS SL30) connected to Bob Archer SA-008 ant= enna in the vertical tail=20
  • COM2 (UPS GX60 GPS/COM) connected to Bob Archer SA= -006 antenna on right side of fuselage behind baggage area bulkhead.<= /FONT>=20
  • ACK E-01 ELT mounted on left side of fuselage behi= nd baggage bulkhead.  ELT antenna is copper foil antenna with torroids=20= as per Bob Nuckolls=E2=80=99 AeroElectric Connection.  Antenna mounted=20= on seatback bulkhead.  ELT remote control in instrument panel and fed w= ith the supplied telephone wire.=20
  • No antenna splitters anywhere =E2=80=93 each radio= has its own dedicated antenna=20
  • RG-400 coax everywhere
Dan,
 
Even if you have 2 antennas, when you transmit on one, the other should= be disconnected from the unused radio.  This may explain the loss of a= radio, especially if com1 and 2 are set to the same frequency.
 
Antennas in proximity may certainly interact in supressing or resonatin= g certain frequencies.  Does your ELT fire only at certain com2 frequen= cies?  Remember that early Garmin panel Mount GPS's requires a specific= filter on the com antenna lines to supress harmonics of about 12=20= com frequencies (one of which was my airport's ground frequency), that disru= pted the GPS operation.
 
The following is the letter I sent to ACK with my ELT:
<<<<<<<<<<<<<<<<

To:        ACK Technologie= s Inc

            <= /SPAN>424 West Julian Street

            <= /SPAN>San Jose, CA 95110

 

            <= /SPAN>408-287-8021

 

From:    Scott Krueger

            <= /SPAN>305 Oak Brook Road

            <= /SPAN>Oak Brook, IL 60523

 

            <= /SPAN>630-561-0400

 

Date:    4 April 2001

 

Re:       RMF induced activatio= n of ACK ELT Model E-01

 

Sirs:

 

I talked to Mike on 2 Apr= il about my problem with Garmin 430 radio transmissions triggering the ELT w= hich is connected to an ELT exclusive use comm antenna about 6 feet from the= transmitting antenna in a Lancair 320.&nb= sp; He gave me some procedures to isolate the problem and also mentio= ned that ACK E-01=E2=80=99s were more resistant to this RMF induced activati= on if they were at the Mod 1 level. =20= He also said if mine was not at that level, I should send it in to re= ceive the free update.  Theref= ore, I have enclosed the ELT for modification.

 

Thanks,

Scott Krueger<= /P>

>>>>>= >>>>>>>>>>>>>>>>

 

Good Luck!

 

Scott Krueger<= /P>

Almost like I'm on V= ACATION. 

 

 

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