Today's Message Index:
----------------------
1. 09:33 AM - Re: Re:Transponder troubles (Doug McNutt)
2. 12:51 PM - Re: Re:Transponder troubles (Kelly McMullen)
3. 01:06 PM - Transponder Whip Antenna in a Composite A/C (dwwilt)
4. 03:11 PM - Removal of Garmin GNS-430 from Instrument Panel (George Nielsen)
5. 05:35 PM - Re: Removal of Garmin GNS-430 from Instrument Panel (Dave)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: re:Transponder troubles |
At 18:50 -0600 9/11/11, Kelly McMullen wrote:
>
>A Narco AT-50.
Mode A and mode C are distinguished by a time spacing between pulses received in
the interrogation from the ground. Mode A inserts twelve bits as entered into
you code selector. Mode C sends twelve bits of altitude information. There
is also a mode B for which the details are "protected" by the US military.
Those settings, in an AT50 are set with analog adjustments inside your transponder
and might well have drifted out of spec. If you're sending mode C information
in response to a mode A request the ground will get a code they don't expect.
It might also look intermittent because it could depend on the received signal
amplitude of the interrogation pulses. (How far away is the transmitter?)
Ant at one time there was an AD that required transponders to reply to mode C requests
even if they had altitude responding turned off. Reason: collision warning
detectors is other aircraft. I believe the AT50 was one of those that was
considered not worth making the modification to. That is from long term memory
though and may not be quite right. Watch out, though, if you ask for a bench
test. You might discover you have an illegal transponder. I'm pretty sure
there was an AT-50A that came out.
--
--> From the U S of A, the only socialist country that refuses to admit it. <--
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: re:Transponder troubles |
Yes, your suspicion was correct, re the alignment. It was a bit out of
spec. Once adjusted back in spec, it tested perfectly both on the bench
and in the aircraft. Yes, there is an AT50A, which I think has more
output power, but otherwise is pretty much the same box, and they are
interchangeable, like all Narco units...same tray, same pins, etc.
On 9/30/2011 9:28 AM, Doug McNutt wrote:
> --> Avionics-List message posted by: Doug McNutt<douglist@macnauchtan.com>
>
> At 18:50 -0600 9/11/11, Kelly McMullen wrote:
>> --> Avionics-List message posted by: Kelly McMullen<kellym@aviating.com>
>>
>> A Narco AT-50.
> Mode A and mode C are distinguished by a time spacing between pulses received
in the interrogation from the ground. Mode A inserts twelve bits as entered
into you code selector. Mode C sends twelve bits of altitude information. There
is also a mode B for which the details are "protected" by the US military.
>
> Those settings, in an AT50 are set with analog adjustments inside your transponder
and might well have drifted out of spec. If you're sending mode C information
in response to a mode A request the ground will get a code they don't expect.
It might also look intermittent because it could depend on the received
signal amplitude of the interrogation pulses. (How far away is the transmitter?)
>
> Ant at one time there was an AD that required transponders to reply to mode C
requests even if they had altitude responding turned off. Reason: collision
warning detectors is other aircraft. I believe the AT50 was one of those that
was considered not worth making the modification to. That is from long term
memory though and may not be quite right. Watch out, though, if you ask for a
bench test. You might discover you have an illegal transponder. I'm pretty sure
there was an AT-50A that came out.
>
>
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Transponder Whip Antenna in a Composite A/C |
I am going to be installing a ACK Technologies ELT into my Lightning. The install
manual explains that for a composite aircraft you should install a ground
plane for the antenna. I want to install the antenna inside the fuselage and
I am wondering if anyone has done this with an ELT. The antenna is a whip antenna
and I have some ideas, that I think would work, but thought I would ask the
community first.
Thanks,
Dennis
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353656#353656
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Removal of Garmin GNS-430 from Instrument Panel |
Could someone please tell me the step-by-step procedure on how to
remove a Garmin GNS-430 from an instrument panel. Does one need any
special tools?
Thanks.
George Nielsen
RV-6 PH-XGN
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Removal of Garmin GNS-430 from Instrument Panel |
Only an allen wrench to crank the unit out of the tray. A 430 has a locking
leg on the bottom of the unit that pulls it in and pushes it out of the
tray. Depending on the clearance in your stack you can see it just left of
center on the bottom and there is a small diameter hole in the unit where
the allen fits. It's about 3" below the face to the release mechanism.
-----Original Message-----
From: owner-avionics-list-server@matronics.com
[mailto:owner-avionics-list-server@matronics.com] On Behalf Of George
Nielsen
Sent: Friday, September 30, 2011 5:06 PM
Subject: Avionics-List: Removal of Garmin GNS-430 from Instrument Panel
--> <genie@swissmail.org>
Could someone please tell me the step-by-step procedure on how to
remove a Garmin GNS-430 from an instrument panel. Does one need any
special tools?
Thanks.
George Nielsen
RV-6 PH-XGN
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|