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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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 Posted: Thu Aug 10, 2006 4:55 pm Post subject: Transponder replacement..... |
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Just wondering if anyone had any comments concerning the
following issue with Narco transponder units..
http://www.gtwn.net/~keith.peshak/NarcoProblems.htm
My old AT-50A is complaining and was looking for a direct
replacement without re-wiring...til I saw this article. Like to have
a 165 but now I'm not so sure....
Thanks.
Jim Baker
580.788.2779
Elmore City, OK
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Bill Denton
Joined: 10 Jan 2006
Posts: 97
Location: Chicago, IL USA
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| Posted: Fri Aug 11, 2006 5:28 am Post subject: Transponder replacement..... |
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I dunno, but I always tend to be suspicious of people trying to sell me
something by bitching about something somebody else is selling...
--
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europa flugzeug fabrik
Joined: 13 Feb 2006
Posts: 65
Location: North Coast, USA
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| Posted: Fri Aug 11, 2006 3:33 pm Post subject: Re: Transponder replacement..... |
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I’ve had no problems with my AT-165. If Narco says their transponders work, as they must, and they pass the biennial check, we can use them. Keith Peshak doesn’t make the rules, and he’s been raging about the “P4 problem” for years to no apparent avail. FAA ignores.
I had an AT-150 covered by the AD (apparent P4 problem), but never did it. ATC never said anything. Perhaps a problem in isolated instances (re TCAS, I think).
Fred F.
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brucebell74(at)sbcglobal.
Guest
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| Posted: Fri Aug 11, 2006 4:17 pm Post subject: Transponder replacement..... |
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I just sent my AT165 back because it did not transmit. You would think that
the quality control people at NARCO would get on this problem. I switch the
AT150 from my old A35 Bonanza to my new RV-4 for test flights. Let you know
when I get the AT165 back from NARCO.
Bruce Bell
Lubbock, Texas
RV-4 N23BB (Flying!)
DO NOT ARCHIVE
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brian
Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA
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| Posted: Sat Aug 12, 2006 6:01 am Post subject: Transponder replacement..... |
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On Aug 11, 2006, at 7:33 PM, europa flugzeug fabrik wrote:
| Quote: |
<n3eu(at)comcast.net>
Jim Baker wrote:
> Just wondering if anyone had any comments concerning the
> following issue with Narco transponder units..
>
> http://www.gtwn.net/~keith.peshak/NarcoProblems.htm
Ive had no problems with my AT-165. If Narco says their
transponders work, as they must, and they pass the biennial check,
we can use them. Keith Peshak doesnt make the rules, and hes
been raging about the P4 problem for years to no apparent avail.
FAA ignores.
I had an AT-150 covered by the AD (apparent P4 problem), but never
did it. ATC never said anything. Perhaps a problem in isolated
instances (re TCAS, I think).
|
I have had problems with transponder/RADAR compatibility with a
couple of different transponders, all of which checked out OK on the
bench (with one exception). The problems do exist and it is possible
that a transponder that checks good on the bench will not work
properly with some ATC RADARs. I even received a pink-slip from the
FAA grounding my aircraft until the transponder was repaired. The
funny thing was, it worked fine with Sacramento, "failed" with
Stockton, and then worked fine again when I crossed into Bay
Approach's airspace. (One flight, all within the space of 15
minutes.) Still, I had to pay a shop to recertify my transponder and
then send the paperwork to the FAA before I could fly again. Funny
thing, the shop found the transponder to be working perfectly.
FWIW, I have had problems with the Terra transponder (no longer made)
and the Garmin GTX-320. The 320 was especially troublesome with
obvious engineering deficiencies in that it was almost impossible to
tune it accurately and get it to stay on frequency. The most reliable
transponder I have ever used is the King KT-76A. Right now I have
Apollo SL-70 transponders in my aircraft and they seem to be quite
reliable although I don't have the same number of years of experience
I have had with the KT-76A.
Brian Lloyd 361 Catterline Way
brian-yak AT lloyd DOT com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery |
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europa flugzeug fabrik
Joined: 13 Feb 2006
Posts: 65
Location: North Coast, USA
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| Posted: Sat Aug 12, 2006 4:33 pm Post subject: Re: Transponder replacement..... |
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| brian wrote: | I have had problems with transponder/RADAR compatibility with a couple of different transponders, all of which checked out OK on the bench (with one exception). The problems do exist and it is possible that a transponder that checks good on the bench will not work
properly with some ATC RADARs....FWIW, I have had problems with the Terra transponder (no longer made). |
Going from memory here, as Mr. Peshak’s writings are too hard to follow to read again and to avoid accusation of slander, but he makes interesting allegations. One is that hardly any transponder meets the TSO, because if they did, ATC systems wouldn’t work, post-TCAS apparently. How FAA issues a very detailed TSO and then privately and contrarily tells King, Collins, RCA, Narco, etc., he doesn’t say, but apparently re the "P4 pulse" potentially indistinguishable from noise to suppress a reply. Perhaps guidance inserted as planned with each mfr inside a Wash Post and left on a park bench near FAA (at) 800 Independence Ave. SW?
Now he says only the Terra does actually comply with the TSO, but consequently breaks ATC interrogator/software systems. So FAA couldn’t legally insist on an AD for Terra to fix, so FAA then installed a software ”Terra patch.” Allegedly also an occasional interrogator sweep to detect any Terra’s squawking out there. Okey dokey...I guess.
Fred F.
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brian
Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA
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| Posted: Sun Aug 13, 2006 8:35 am Post subject: Transponder replacement..... |
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On Aug 12, 2006, at 8:33 PM, europa flugzeug fabrik wrote:
| Quote: | Going from memory here, as Mr. Peshaks writings are too hard to
follow to read again and to avoid accusation of slander, but he
makes interesting allegations. One is that hardly any transponder
meets the TSO, because if they did, ATC systems wouldnt work, post-
TCAS apparently. How FAA issues a very detailed TSO and then
privately and contrarily tells King, Collins, RCA, Narco, etc., he
doesnt say, but apparently re the "P4 pulse" potentially
indistinguishable from noise to suppress a reply. Perhaps guidance
inserted as planned with each mfr inside a Wash Post and left on a
park bench near FAA (at) 800 Independence Ave. SW?
Now he says only the Terra does actually comply with the TSO, but
consequently breaks ATC interrogator/software systems. So FAA
couldnt legally insist on an AD for Terra to fix, so FAA then
installed a software Terra patch. Allegedly also an occasional
interrogator sweep to detect any Terras squawking out there. Okey
dokey...I guess.
|
The key point is that you have a technical spec for transponders and
then you have manufacturers who build to the spec and their stuff
doesn't work. They fiddle with the design until their transponders
deviate from the spec but actually work and ship them that way. Makes
sense to me.
So, it doesn't matter what the spec is, the equipment has to work.
That is all that matters.
Brian Lloyd 361 Catterline Way
brian-yak AT lloyd DOT com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery |
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