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Peter Antypas 2020-10-18 09:49:40 -07:00
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README.md
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@ -8,7 +8,7 @@ In 2018 I installed this system on my boat. It is still working fine after 2 yea
![Image](images/UnitExterior.jpg?raw=True "Exterior View")
I have refined the design somewhat, and it now has an "official" name, borrowed from a Pacific atoll in the Kiribati islands. I do intend to trademark this, in the same way that "Arduino" is a trademark that identifies the original rather than the many clones that inevitably emerged.
I have refined the design quite a bit, and it now has an official name. "Maiana" is an atoll in the Kiribati islands. I do intend to trademark this, in the same way that "Arduino" is a trademark that identifies the original rather than the many clones that inevitably emerged.
## Overall description
@ -18,7 +18,7 @@ The main difference between this design and nearly every commercial transponder
radios and antennas and thus only needs a power and data cable to connect to the cabin. The PCBA is only 1" wide so it fits inside
1" schedule 40 PVC pipe, which I used as the antenna base. The GNSS receiver and antenna are on the board:
![Image](images/Board4.3.jpg?raw=True "PCBA version 4.3")
![Image](images/transponder-6.1.jpg?raw=True "PCBA version 6.1")
The design is based on two Silicon Labs 4463 transceiver ICs and an STM32L4xx series microcontroller (L412 and L432 as of now).
The GNSS is a Telit SE873 (7x7mm module) and relies on a Johanson ceramic SMD antenna. It usually takes about a minute to acquire a fix outdoors.
@ -35,7 +35,7 @@ will simply run as a receiver and never transmit.
The system draws about 40mA from 12V in RX mode, and spikes up to 600mA during transmission (for about 30 milliseconds).
The latest design (not the one pictured above) relies on Ethernet cable for power, data, and control signals such as "TX OFF". I will include a reference design for a
The latest design (6.1 pictured above) relies on plain Ethernet cable for power, data, and control signals such as "TX OFF". I will include a reference design for a
control box that I'm working on but every boat is different, so your mileage will absolutely vary.
@ -48,11 +48,8 @@ the required symbols in the preprocessor to build for different board revisions.
This is going to be difficult for all but the most technically advanced.
The board features all surface mounted components, with 5 QFNs, a few SOT-363s and all 0603 passives. Unless you're skilled with stencils and reflow, you will find it challenging.
I am going to make it available as part of a kit (probably on tindie.com). The kit will include a 95% finished PCBA as well as the VHF antenna,
enclosure and sealing components (which are NOT open sourced). The board will be programmed and tested, and the antenna will be perfectly matched. The cable and whatever lies on the
other side of it will be the buyer's responsibility.
The board features all surface mounted components, with 5 QFNs, a few SOT-363s and all 0603 passives. Unless you're skilled with stencils and reflow, you will find it challenging. So I am going to make it available as part of a kit on tindie.com. The kit will include a 95% finished PCBA as well as the VHF antenna,
enclosure and sealing components (which are NOT open sourced). The board will be programmed and tested, and the antenna will be perfectly matched. The cable and whatever lies on the other side of it will be the buyer's responsibility.
### License

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