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alec(at)alecmyers.com
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 Posted: Sat Dec 10, 2022 7:18 am Post subject: Radio altimeter |
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Here’s little project that might fire someone’s 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’s 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 I’m 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’s a picture of the display unit, the box is about 3 inches long:
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alec(at)alecmyers.com
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| Posted: Sat Dec 10, 2022 7:21 am Post subject: Radio altimeter |
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Sorry - my bad - the antenna is secured with 3m "dual lock” tape - it’s like a more robust version of Velcro. It’s great for securing things in an airplane in a temporary fashion. If anyone hasn’t tried it, I recommend it!
On Dec 10, 2022, at 9:52 AM, Alec Myers <alec(at)alecmyers.com> wrote:
Here’s little project that might fire someone’s 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’s 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 I’m 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’s a picture of the display unit, the box is about 3 inches long:
<IMG_2561.jpeg>
<IMG_2560.jpeg>
| | - 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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david(at)carter.net
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| Posted: Sat Dec 10, 2022 8:22 am Post subject: Radio altimeter |
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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(at)alecmyers.com (alec(at)alecmyers.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)>
Sorry - my bad - the antenna is secured with 3m "dual lock” tape - it’s like a more robust version of Velcro. It’s great for securing things in an airplane in a temporary fashion. If anyone hasn’t tried it, I recommend it!
On Dec 10, 2022, at 9:52 AM, Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:
Here’s little project that might fire someone’s 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’s 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 I’m 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’s a picture of the display unit, the box is about 3 inches long:
<IMG_2561.jpeg>
<IMG_2560.jpeg>
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david(at)carter.net (david(at)carter.net)
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