Nathan @nmk4567

UMD Aero '25, Doing Electronics and Space Stuff Massachusetts, USA Joined November 2015

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Nathan @nmk4567

a year ago

As someone who does not have to imagine being a student graduating from UMD last week with a degree in aerospace engineering (I am one), I would appreciate it if fox news did not presume to know how we feel

Acyn @Acyn

a year ago

Gaines: You can even make this up. Instead of honoring entrepreneurs or veterans or innovators, they picked Kermit the Frog…

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Nathan @nmk4567

a year ago

I've been working on a fun project recently

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Nathan @nmk4567

a year ago

@cnlohr @dsp8bit It works fine for me. I haven't figured out the scaling yet but divide by 2pi happened to work for a period of 20 samples. I started by changing the bit shifting to (2 - C) where C is a small constant, then I derived the eq for C, then when I saw eq3 it ended up being the same.

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Nathan @nmk4567

a year ago

@dsp8bit @cnlohr It looks like eq 3 is what's going on here, with the bit shifting creating a small angle approximation of 2*cos(2*pi*f*T)

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Nathan @nmk4567

a year ago

@ElectronicsbyJH Are you TID testing a spartan 7? That's actually very relevant to a project I'm working on, I hope you publish the results

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Nathan @nmk4567

2 years ago

Today on things that shouldn't be used as SDRs: the HSTX peripheral on the Raspberry Pi Pico 2. I'm using it to transmit a clock output at 150 MHz, then using DMA to toggle a bit that inverts the output, which makes BPSK. It makes an absolute mess of the spectrum, but it works.

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Nathan @nmk4567

2 years ago

@GregDavill Is that a SOIC flash chip on a WSON footprint? I definitely haven't done that before🙃

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Nathan @nmk4567

2 years ago

@cnlohr @Ascii211 The sdk can be annoying to use (though I've yet to find an ecosystem other than Arduino that I'd consider easy to get into) but the power of PIO and now HSTX is worth it imo. You can do all sorts of stuff that would otherwise need an FPGA.

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Nathan @nmk4567

2 years ago

I think I've got a way to modulate (D)BPSK at the clk_hstx frequency with a configurable divider to set datarate and it uses 0 CPU cycles (only DMA and PIO). I preordered some pico 2s so I'll test it out when they come in.

will whang🌻 @will_whang

2 years ago

Someone is probably going to build a SDR out of this.

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Nathan @nmk4567

2 years ago

@will_whang It's me I'm someone

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Nathan @nmk4567

2 years ago

@cliffordheath Though of course, the mechanicism by which strain affects the FPGA could be due to changes in capacitance. There's some theories in the original articles but no conclusion.

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Nathan @nmk4567

2 years ago

@cliffordheath Definitely strain. I was pressing with a thin plastic tool and the amplitude changed based on pressure, not proximity. Just touching the chip with my finger didn't produce any noticeable effect.

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Nathan @nmk4567

2 years ago

I saw an article about using an FPGA as a strain gauge by looking at the frequency of a ring oscillator and I wanted to try it. Half an hour later, I had this graph. The two spikes are the times I was pressing on the FPGA, with maybe 3 lbs of force. FPGA is an Artix 7.

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Nathan @nmk4567

2 years ago

I found out about here: voltagedivide.com/2024/03/18/unc… Original article: hackaday.com/2015/09/27/mys…

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Nathan @nmk4567

2 years ago

@Ascii211 Any idea what mission or program it's from? From date codes on the parts it looks like it's from the mid 90s.

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Nathan @nmk4567

2 years ago

@TheZoq2 A modern UX and FST support? I've been waiting literally years for this. It just needs an option to use as a vscode extension for opening FSTs/VCDs and it'll be perfect.

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Astranis Space Technologies @Astranis

2 years ago

For any spacecraft, there's one system that unifies them all: avionics. In our latest engineering video learn how we approach avionics at Astranis.

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Nathan @nmk4567

3 years ago

@joebarnard I've got a final on compressible aerodynamics this week. I am not looking forward to it.

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Nathan @nmk4567

3 years ago

@joebarnard I loved The Three Body Problem, the first book definitely had the same feeling as Project Hail Mary and the next two were pretty good as well

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Nathan @nmk4567

3 years ago

@Ascii211 None of my benches have ever looked that neat lol Is that a korad PSU? I've been thinking about getting one, mainly because it's the cheapest I've seen that's both programmable and linear.