It depends on where the hike is:
Dropping an orange peel in a humid, temperate, low-elevation place is vastly different than a desert, high-alpine, tundra or other environment where organics take a long time to decompose.
I'm mostly joking.. LNT is always the best policy, even if only (sometimes) for the feeling of pristineness.
Honestly orange peels are incredible, the smell, the robustness. It reminds me of the joke of the plastic cup at Whole Foods filled with orange slices. If only there was a natural packaging alternative...
phased array is better than whatever that guy was doing!
MoonRF mostly takes care of the hardware and pointing, and then the fun is playing with software and signal processing: https://github.com/open-space-sdr/main
You can find all the software there (for every demo shown on the website), but it's not "build-ready" given the hardware isn't released yet as the website makes clear. The repo is from last year but not generally advertised.
I suppose HN picked up on this project again because of the moon mission this week.
unfortunately the ECP5-5G FPGA (with the SERDES/PCIe option), costs way more than the ECP5 (without SERDES). The Pi-5's MIPI interfaces gives you 8 parallel LVDS lanes that can run at 640 MHz each which is manageable for a cheap FPGA.
unfortunately the FPGA verilog source code isn't open source.. and I can't see any RF block diagram in the website
Some more questions because the website isn't clear:
- does the FPGA handle digital beamforming in the FPGA fabric? or it controls RF phase shifters for analog beamforming?
- will we have access to FPGA pin constraint file so we can write our own verilog
- can I get IQ samples from the antenna elements and run my own beamforming algorithm / calibration in a separate PC with possible GPU acceleration? or it will be bottlenecked by rpi5 gigabit ethernet?
Yes the FPGA does digital beamforming and there will be published FPGA pin constraint files so you can write your own Verilog.
For IQ samples, you can stream a continuous 60 MSPS IQ beam over the Ethernet, but for custom beamforming algorithms, the processing needs to be distributed across the FPGAs (for MoonRF it is a SERDES daisy chain, using the same FFC connectors as the links to the RPi-5).
Yes I'll put some newer block diagrams on the website this week. Thanks for the reminder.
The individual Falcon turn-around is slow (months of refurb), and the record half-month ones swapped some engines. B1067's 30-reuse is a ship of Theseus rebuilt over 4+ years.
Feh, swapping engine is not an option for the first few initial Mars trips, unless its payload also contains engines (can't imagine the scissor-lift payload either that needs to go with).
The head of SDI formed the Mars Society with Zubrin. He was originally going to run SpaceX as Chief Engineer (cite: Liftoff) but he instead got appointed NASA admin and directed the first few $billion to a zero-experience SpaceX. This same SDI head then formed something called SDA in 2017 under Trump which is the platform for Golden Dome, or "the SDI 2.0".
This is a multi-trillion dollar program which only Musk has been awarded contracts (as of Nov 2025) and involves the total weaponization of space.
The US space industry isn't that big. The same people are all over the place and many have been in the industry for many, many decades and had many positions. And many of the people interested in Mars are also interested in space in general and in military space in general, this isn't surprising.
When SpaceX got started, clearly with the focus on Mars he tried to pick up well known experts. Griffin among them, again this isn't surprising. And when SpaceX did that it was not at all clear that Griffin would be able to be NASA Administrator. And because Griffin as a very opinionated person he didn't get along super well with Musk and instead went to In-Q-Tel. But he knew that SpaceX was serious and Musk had the financed to put more money into SpaceX then most other companies.
Also you will see the Griffin was also at Orbital Sciences as CEO. So he had some links to both competitors in the COTS competition and likely knew or worked with many others over his career.
And if you do the research on COTS instead of just saying 'directed the first few $billion to a zero-experience SpaceX' is just a major oversimplification. COTS started by other people inside NASA who were sick of the old practices.
The first round of COTS were selected May 2006. SpaceX launched the first Falcon 1 in March 24, 2006. So during COTS SpaceX was not some 'nobody' company, NASA was aware of them and while today 'private company close to launching Orbital rocket' isn't impressive anymore, back then it was very much so. SpaceX had done more already then many other companies in the competition.
Also, if you know anything about NASA processes, the Administrator can not just 'pick' whoever he wants. There is process that is guided by lots of requirements and so on. Unless you have any actual evidence that this process was somehow corrupt and that Griffin conspired to give money to SpaceX above everybody, then you better show some evidence for that. And 'worked for few month with Musk' isn't evidence. And in fact SpaceX was selected because many of the NASA people who did the selection were impressed with SpaceX as many have talked about in interviews over the years.
Given that SpaceX was selected and was successful, its hard to argue that NASA made the wrong choice. NASA selected 3, SpaceX, Kistler and Orbital, and 2 of those were successful. So it seems the program wasn't run by idiots.
Literally the whole 'evidence' for 'theory' is Mike Griffin likes missile defense and he has been in the Space industry for many, many decades and knows everybody. That's it, that's your evidence. Griffin and others like him never made secret of what they wanted. That doesn't mean that when he worked at NASA missile defense was the only thing he ever thought about and that all his actions at NASA were only with the singular goal of missile defense.
If you want to make the argument that orbital missile defense is a bad idea, that's fine, you don't need need to make up a bunch of conspiracy theory where non exists. You just make yourself look silly.
Actually I recall their were a number of anomalies with Griffin's contracts at NASA. It was widely reported he was chasing away the bigger companies from the COTS program he formed. Saying himself that he assigned the decision-making to Doc Horowitz... Mike Griffin, Doc Horowitz and Elon Musk were close friends and the most prominent founding members of the Mars Society other than Zubrin. In the end all the money went to Griffin's own small company Orbital and Musk's newfound SpaceX.
It was well known in those circles that Mars Society leadership was from Team B and Citizens' Advisory Council (which were the two groups that originally conceived Reagan's SDI, the Golden Dome predecessor). Max Hunter was the force behind reusable rockets with the DC-X. As mentioned, Griffin was effectively SpaceX's early chief engineer leading the guys he poached from the nearby McDonald Douglass Huntington Beach DC-X site (Chris Thompson, Tim Buzza, John Garvey, etc..) The other half of the DC-X team went to Blue Origin of course.
Funny how well the Mars mania took hold and people forget this basic history. It's the only way to make heads or tails of what's going on with Elon these days. He truly believes in SDI, but God help us all if he's in charge of it. It was recently reported he wanted to make Golden Dome a subscription service!
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