<div dir="ltr">These satellites use LoRaWAN. Their transmissions will be received by The Things Network. This is an IoT platform and network. <br><br>Read about that here: <a href="https://www.thethingsnetwork.org/">https://www.thethingsnetwork.org/</a><br><br>I'm not a LoRaWAN expert, but the clock requirements and synchronization are not tight. There is not a high precision or stability requirement. End nodes are asynchronous. They transmit when they have data available to send, and their transmissions are generally received by multiple stations. <br><br>Design is open source and on their GitHub. <br><br><a href="https://github.com/ambasat/AmbaSat-1">https://github.com/ambasat/AmbaSat-1</a><br><br>The schematic is in Eagle. The datasheets are in a folder in that repository. <br><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr">-Michelle W5NYV<br><br><div dir="ltr"><br></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 27, 2019 at 5:37 AM John Ackermann. N8UR <<a href="mailto:jra@febo.com">jra@febo.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="zoom:0%"><div dir="auto">In this context, what does "Ultra Stable" mean? There are a bunch of interesting challenges with crystals in space because of the launch shock, the huge temperature swings, and the thermal insulating properties of vacuum.<br><br></div>
<div dir="auto">I know people who know about these things and would be glad to help if we wanted to do this, but a spec is the first requirement. It would need to include (at a minimum) nominal frequency, short-term stability, phase noise, drift/aging, temperature response, and absolute frequency accuracy, along with mechanical things like shock rating, physical dimensions, and power budget. There would have to be consideration of thermal management as well, given the likely need for an oven.<br><br></div>
<div dir="auto"> (Note: I've never done spacecraft design, but I've picked up on these issues from conversations with those who have worked on space-borne USOs.)<br><br></div>
<div dir="auto">73,<br></div>
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<div class="gmail_quote">On Sep 27, 2019, at 1:32 AM, Michelle Thompson via Ground-Station <<a href="mailto:ground-station@lists.openresearch.institute" target="_blank">ground-station@lists.openresearch.institute</a>> wrote:<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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We can design our own sensor. There's a blurb about it on the site and specs for the footprint and interface.
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If someone commits to build and test, I can work with Ambasat to see if we can get it on there.
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On Thu, Sep 26, 2019, 22:27 Douglas Quagliana <
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Rather than a sensor, could we get an ulta stable oscillator (USO) for some frequency in an amateur satellite band? We would just need the USO, a small amplifier and an antenna. Even an inefficient antenna. Even if we’re only radiating a few milliwatts. There’s still a lot of good science we can do from an unmodulated carrier with Doppler.
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<br>On Sep 26, 2019, at 6:24 PM, Michelle Thompson via Ground-Station <
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There are solar panels.
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<br>"AmbaSats are just a little bigger than the size of a couple of postage stamps but have solar cells, a LoRaWAN radio transceiver..."
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<br>For the dashboard, there's a big hint here:
<br>"Your AmbaSat-1 is fully TTN compliant so as well as viewing data in your Dashboard, you can sign-up for a TTN account and access your satellite’s sensor data directly using a range of different TTN extensions."
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<br>I think the dashboard is essentially The Things Network. I'll see what I can find out about the dashboard availability.
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<br>Interesting question about HABs! I think several people on this list are much more active than I am in designing and building payloads, and might be able to give an evaluation based on what's on the
<a href="http://ambasat.com" rel="noreferrer" target="_blank">ambasat.com</a> website.
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On Thu, Sep 26, 2019 at 11:56 AM KC9SGV <
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The "three months in space" bit, makes me wonder.
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Maybe out of power by then ?
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(Don't see any solar panels on the board.)
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What would the possibility be to use the board as payload on a HAB (high altitude balloon).
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Maybe a Mylar balloon cluster achieving float, like the current Miami effort ?
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Then the environmental modules would make sense.
<br>Could you get the dashboard and web based tracking without buying the launch ?
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Bernard,
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<br>Sent from my iPad
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<br>On Sep 26, 2019, at 1:11 PM, Howie DeFelice via Ground-Station <
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It has a LoRA radio on board which is really cool. I always thought that LoRA on a LEO would make a great Store and Forward messaging sat. The chirp spread spectrum modulation handles doppler quite well and LoRA chips on carrier boards are easy to find to make ground stations. Unfortunately there is little chance we could license it since the FCC decided that anything smaller than a 1U cubesat is too small to track.
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AB2S
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<font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Ground-Station <<a href="mailto:ground-station-bounces@lists.openresearch.institute" rel="noreferrer" target="_blank">ground-station-bounces@lists.openresearch.institute</a>> on behalf of Michelle Thompson via Ground-Station <<a href="mailto:ground-station@lists.openresearch.institute" rel="noreferrer" target="_blank">ground-station@lists.openresearch.institute</a>><br> <b>Sent:</b> Thursday, September 26, 2019 11:26 AM<br> <b>To:</b> Michelle Thompson via Ground-Station <<a href="mailto:ground-station@lists.openresearch.institute" rel="noreferrer" target="_blank">ground-station@lists.openresearch.institute</a>><br> <b>Subject:</b> [Ground-station] Please vote - Ambasat sensor</font>
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I bought into the Kickstarter for Ambasat.
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<a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fambasat.com%2F&data=02%7C01%7C%7C2c3f3cef695d4bdb07b208d7429697ee%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637051086889564741&sdata=HQ1maV9Z5PGG%2BUZf%2FqV5zFpH8qsFQ0WDvC4BHQkJ5rE%3D&reserved=0" rel="noreferrer" target="_blank">https://ambasat.com/</a>
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I’d like you all to help choose the sensor!
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Choices here:
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<a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fambasat.com%2Fambasat-2%2Fsensor-options%2F&data=02%7C01%7C%7C2c3f3cef695d4bdb07b208d7429697ee%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637051086889574740&sdata=0gUbpgbQldmIxAydIuXk6fdBWaQQmBuY8yEH48Rpe64%3D&reserved=0" rel="noreferrer" target="_blank">https://ambasat.com/ambasat-2/sensor-options/</a>
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Disclaimer:
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This has nothing to do with our project. I acknowledge that Ambasat is controversial. No project funds are involved.
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Why post this here?
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I asked Ambasat about a custom amateur radio payload, so we could test something for us. The kickstarter had that option. The lead of Ambasat said yes, amateur payload ok, several people I asked at Virginia Tech said go for it, and a small group looked at the specs and tried to design something useful for us. But, the very compact size and power budget was quite daunting. And the time frame was very short. We don’t have enough miniaturization or time. Instead of a custom board, we have a standard flight and a ground version.
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Instead of quietly sending this up, I wanted to share it with the team as something fun. I just received the survey for the sensors, so we easily have a week at least to vote. It includes some sensors already. The free choice is an additional sensor slot.
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-Michelle W5NYV
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"Potestatem obscuri lateris nescis."
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