Today's Message Index:
----------------------
1. 07:18 AM - Radio altimeter (Alec Myers)
2. 07:21 AM - Re: Radio altimeter (Alec Myers)
3. 07:26 AM - Re: Identify this connector... (Alec Myers)
4. 08:22 AM - Re: Re: Radio altimeter (David Carter)
Message 1
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Here=99s little project that might fire someone=99s
imagination.
I bought a radio altimeter module from Ainstein (US-D1:
https://ainstein.ai/drone-makers-drone-service-providers/us-d1/) and
paired it with a PIC microcontroller-driven display, to make a radio
altimeter to help my students learn to judge their height above ground
when learning to land.
First iteration was with a four digit display height readout, but nobody
has time to be looking at that while landing, so now I have three
LED=99s and a buzzer: red shows above 25=99, amber is
4=99-25=99 and green is 3=99 and below. The buzzer
sounds intermittently below 25=99 and continuously at 3=99.
The switch disables the buzzer, in case it gets irritating.
Because I=99m in a TC aircraft and not OBAM, the antenna is
attached with 3M mate-n-lok to the inside of a plastic inspection hatch
on the belly (radiation transparent) and the whole thing is powered from
the 5v output of a USB port (or USB battery power-pack).
I have noticed that the antenna emits enough unwanted RF on a frequency
of 125.00MHz to open the COM squelch and give a lot of noise in the
headsets on that frequency, which is unfortunate as 125.00MHz is the
tower frequency of a nearby airport, but other than that it works well.
Here=99s a picture of the display unit, the box is about 3 inches
long:
Message 2
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| Subject: | Re: Radio altimeter |
Sorry - my bad - the antenna is secured with 3m "dual lock tape - its like a more
robust version of Velcro. Its great for securing things in an airplane in a
temporary fashion. If anyone hasnt tried it, I recommend it!
On Dec 10, 2022, at 9:52 AM, Alec Myers <alec@alecmyers.com> wrote:
Heres little project that might fire someones imagination.
I bought a radio altimeter module from Ainstein (US-D1: https://ainstein.ai/drone-makers-drone-service-providers/us-d1/)
and paired it with a PIC microcontroller-driven
display, to make a radio altimeter to help my students learn to judge
their height above ground when learning to land.
First iteration was with a four digit display height readout, but nobody has time
to be looking at that while landing, so now I have three LEDs and a buzzer:
red shows above 25, amber is 4-25 and green is 3 and below. The buzzer sounds
intermittently below 25 and continuously at 3. The switch disables the buzzer,
in case it gets irritating.
Because Im in a TC aircraft and not OBAM, the antenna is attached with 3M mate-n-lok
to the inside of a plastic inspection hatch on the belly (radiation transparent)
and the whole thing is powered from the 5v output of a USB port (or USB
battery power-pack).
I have noticed that the antenna emits enough unwanted RF on a frequency of 125.00MHz
to open the COM squelch and give a lot of noise in the headsets on that
frequency, which is unfortunate as 125.00MHz is the tower frequency of a nearby
airport, but other than that it works well.
Heres a picture of the display unit, the box is about 3 inches long:
<IMG_2561.jpeg>
<IMG_2560.jpeg>
Message 3
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| Subject: | Re: Identify this connector... |
I think those are the ones - thank you.
On Dec 8, 2022, at 2:11 PM, Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
wrote:
At 04:25 PM 12/7/2022, you wrote:
> Can the brains trust give a part code for this connector and the M and F pin
inserts?
>
> I think its an AMP part; its the connector on the pea lights inside various analog
flight instruments.
>
Those are VERY old AMP-Inc products.
\ I think these are what you're looking
for.
https://tinyurl.com/8by775x
Sometime I'll have to tell 'yall the story
about the first time I saw this line
of products.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 4
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| Subject: | Re: Radio altimeter |
Very similar in concept to this product -
https://landingheight.com/shop/
I have their earlier non-certifed version in my RV-7A.
https://www.enginebridge.com/product/landing-height-controller-copy/
On Sat, Dec 10, 2022 at 8:21 AM Alec Myers <alec@alecmyers.com> wrote:
>
> Sorry - my bad - the antenna is secured with 3m "dual lock=9D tape
- it=99s
> like a more robust version of Velcro. It=99s great for securing thi
ngs in an
> airplane in a temporary fashion. If anyone hasn=99t tried it, I rec
ommend it!
>
>
> On Dec 10, 2022, at 9:52 AM, Alec Myers <alec@alecmyers.com> wrote:
>
> Here=99s little project that might fire someone=99s imaginati
on.
>
> I bought a radio altimeter module from Ainstein (US-D1:
> https://ainstein.ai/drone-makers-drone-service-providers/us-d1/) and
> paired it with a PIC microcontroller-driven display, to make a radio
> altimeter to help my students learn to judge their height above ground wh
en
> learning to land.
>
> First iteration was with a four digit display height readout, but nobody
> has time to be looking at that while landing, so now I have three LED
=99s and
> a buzzer: red shows above 25=99, amber is 4=99-25=99 an
d green is 3=99 and below.
> The buzzer sounds intermittently below 25=99 and continuously at 3
=99. The
> switch disables the buzzer, in case it gets irritating.
>
> Because I=99m in a TC aircraft and not OBAM, the antenna is attache
d with 3M
> mate-n-lok to the inside of a plastic inspection hatch on the belly
> (radiation transparent) and the whole thing is powered from the 5v output
> of a USB port (or USB battery power-pack).
>
> I have noticed that the antenna emits enough unwanted RF on a frequency o
f
> 125.00MHz to open the COM squelch and give a lot of noise in the headsets
> on that frequency, which is unfortunate as 125.00MHz is the tower frequen
cy
> of a nearby airport, but other than that it works well.
>
> Here=99s a picture of the display unit, the box is about 3 inches l
ong:
>
> <IMG_2561.jpeg>
>
> <IMG_2560.jpeg>
>
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> --
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David Carter
david@carter.net
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