Today's Message Index:
----------------------
1. 07:11 AM - Blind encoder readout (Lmar)
2. 09:33 AM - Re: Blind encoder readout (David Lloyd)
3. 11:29 AM - Re: Blind encoder readout (Joe Dubner)
4. 03:03 PM - Re: Blind encoder readout (Doug McNutt)
Message 1
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| Subject: | Blind encoder readout |
--> Avionics-List message posted by: Lmar <my93avid@yahoo.com>
Hi,
Is there as way that I could read the altitude that my encoder is transmittitng.
Might I also be able to adjust the encoder to read the correct altitude.
While I can usually follow directions, I do not have an understanding of avionics
or electronics.
Thanks,
Larry
Message 2
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| Subject: | Re: Blind encoder readout |
--> Avionics-List message posted by: "David Lloyd" <skywagon@charter.net>
Larry,
There are several portable gadgets on the market that will read what your
encoder and transponder are transmitting. I don't have the details at the
moment, but, if you peruse the Flyer mags, you will probably find an ad.
However, the one I have seen a lot of is around $600. So, maybe someone has
one to loan you for a weekend. You just put it on the top of the panel and
go fly with the transponder on. It will display what the ground radar is
receiving from you.
David
----- Original Message -----
From: "Lmar" <my93avid@yahoo.com>
Subject: Avionics-List: Blind encoder readout
> --> Avionics-List message posted by: Lmar <my93avid@yahoo.com>
>
> Hi,
>
> Is there as way that I could read the altitude that my encoder is
> transmittitng. Might I also be able to adjust the encoder to read the
> correct altitude. While I can usually follow directions, I do not have an
> understanding of avionics or electronics.
>
> Thanks,
> Larry
>
>
>
Message 3
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| Subject: | Re: Blind encoder readout |
--> Avionics-List message posted by: Joe Dubner <jdubner@yahoo.com>
Larry,
One option is to buy and assemble an Altitude Encoder Test Box Kit from
RST Engineering
(http://rst-engr.com/rst/catalog/altitude_encoder_and_elt.html).
The nine LEDs illuminate to show the state of your encoder's output
lines and can be used with a chart of altitude vs. encoder output to
decode your altitude and (possibly) adjust your encoder. See
http://rst-engr.com/rst/articles/kpapr98/index.html
I homebrewed a version of this tester but was unable to properly adjust
my old TCI piece-of-junk-suitable-only-as-a-boatanchor blind encoder.
Nowadays the tester still comes in handy to verify the output of my
Dynon EFIS encoder or a local buddy's ACK encoder at field elevation.
And with a small suction bulb applied to the static port, I can run the
altitude up as desired for further testing.
--
Joe
Joe Dubner, K7JD
523 Cedar Avenue
Lewiston, ID 83501
cell: (208) 305-2688
http://www.nicon.org/chapter328/jd/
On 03-Jun-05 07:11 Lmar wrote:
> --> Avionics-List message posted by: Lmar <my93avid@yahoo.com>
>
> Hi,
>
> Is there as way that I could read the altitude that my encoder is transmittitng.
Might I also be able to adjust the encoder to read the correct altitude.
While I can usually follow directions, I do not have an understanding of avionics
or electronics.
>
> Thanks,
> Larry
Message 4
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| Subject: | Re: Blind encoder readout |
--> Avionics-List message posted by: Doug McNutt <douglist@macnauchtan.com>
At 07:11 -0700 6/3/05, Lmar wrote:
> Is there as way that I could read the altitude that my encoder is transmittitng.
Might I also be able to adjust the encoder to read the correct altitude.
Remember that the transponder puts out your pressure altitude. No correction for
the local barometric pressure is applied in the aircraft. It's done on the ground.
That means that anything you build for comparison with your altimeter will have
to include the appropriate arithmetic.
--
--> The best programming tool is a soldering iron <--
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