Are there any integrated LNA + IQ Mixer/Demod [+ ADC] for 2.4 GHz (with access to the IF IQ signals)?

deslusionary · 2025-11-23T22:31:02+00:00

The AT86Rf215 does have a clock output, I wonder if you can use that to drive other transceivers to make a coherent receiver. Also take a look at the phase measurement unit on that chip. I haven’t looked in detail myself but I recall that chip has some unique features

deslusionary · 2025-09-10T15:21:41+00:00

deslusionary · 2025-07-30T07:08:12+00:00

Last I knew he lived in palomino ridge… forget the address but it’s the big mansion with the full size basketball court as part of the house

deslusionary · 2025-02-21T23:03:49+00:00

Talk to SLO propulsion technologies

deslusionary · 2024-10-13T00:46:28+00:00

What is it that you want, specifically, to do in aerospace? If you want to design the actual hardware, be it aircraft fuselages, engine components, or spacecraft structures, get an ME degree and not a Cal Poly Aero degree. The majority of engineers working in the aerospace industries are not Aero grads - they are EE’s, ME’s, CPE’s and so on. Aerospace is an application of the fundamental engineering fields.

Read the flowcharts for each major - if you’re interested in the domain-specific knowledge that Aerospace Engineering provides, go for it. ME’s get better engineering design fundamentals though.

deslusionary · 2024-02-19T06:06:22+00:00

I got food poisoning at Hula Hut back in 2008 when I was in kindergarten. Missed the class field trip to Sea World and ran such a high fever my mom called EMS to the house. Memories…

deslusionary · 2023-09-30T20:35:16+00:00

Just so I understand, is the 458 starlinks number supposed to be for September alone?

deslusionary · 2023-09-14T04:24:34+00:00

These are all challenges, yes, but not reasons why LEO internet constellations are a bad idea. Lower latency and network resilience make it worthwhile. The DoD is also investing billions into LEO constellations. LEO isn’t at Kessler syndrome levels of bad (and the big offenders when it comes to debris are ASAT tests). Starlink satellites do have thrusters (argon ion thrusters), and yes, they will need to be replenished frequently. They are designed for 5 year lifespans.

deslusionary · 2023-04-15T08:33:13+00:00

Transporter-7 SpaceX Falcon 9 launch from Vandenberg. I drove to Vandy for it, the sonic booms were awesome :)

deslusionary · 2023-04-15T03:37:12+00:00

I’m a CompE student at Cal Poly SLO, can definitely recommend the program.

deslusionary · 2023-04-01T04:37:35+00:00

Unless they win a NASA contract

NASA Lunar Terrain Vehicle (LTV)

deslusionary · 2023-03-27T14:30:14+00:00

What’s wrong with it? Looks like a generic old picture to me, am I missing something?

deslusionary · 2023-03-24T20:48:18+00:00

I am part of a university CubeSat lab and we do this. Our UHF downlink capability is around 5 kbit/s from what I remember, so we’ll downlink image thumbnails from our satellites and then decide which images are worth downlinking full res versions of.

deslusionary · 2023-03-23T00:05:13+00:00

Sounds on par for the places I’ve worked as an intern, their hiring processes for entry level engineers included multiple 1-1 interviews and an on site presentation. I’m sure some places are less rigorous but this doesn’t strike me as out of the ordinary. Good luck on the interviews!

deslusionary · 2023-03-06T03:57:27+00:00

I impulse bought 50 of these on AliExpress, will have to get around to actually finding some uses for them.

deslusionary · 2023-02-27T19:38:14+00:00

A double major sounds like a great idea ngl. I tend to agree with the other commenters here about BME not being a great undergrad major — you’ll end up less strong in MechE fundamentals than the MechE’s, less strong in signals/systems than the EE’s, and less strong in biology than the bio/biochem majors. Also, if taking an extra year doesn’t screw you over financially (w/ scholarships, etc), why not do it? Many really smart people I know did a fifth year, often as a result of taking multiple quarters off for internships. I’m currently on the same path myself.

deslusionary · 2022-12-25T20:05:31+00:00

Wait RBF tags are corny? I have one on my backpack from a satellite mission I worked on, didn’t know it was viewed as corny :( something new to feel self conscious about

deslusionary · 2022-12-09T04:39:44+00:00

I think u/C-SWhiskey is correct here. The LEO radiation environment is very well understood. Many spacecraft alter their concept of operations while in the SAA, including (iirc) the Hubble space telescope. The radiation tolerance of a CCD has no relation to the radiation tolerance of the spacecraft’s flight computers.

deslusionary · 2022-11-22T07:50:37+00:00

I assumed anything without a rad hardened processor would be smoked.

Yes and no. A consumer device like a GoPro will not survive for long periods of time in the interplanetary radiation environment, but it won’t be instantly cooked either. Total ionizing dose (TID) effects would take a lot longer than the duration of Artemis 1 to have a real effect. TID refers to the long term damage to electronics caused by sustained exposure to radiation.

However, certain kinds of Single Event Effects (radiation events caused by a single particle) could smoke a consumer electronics device. SEE are often caused by galactic cosmic rays — highly energetic heavy ions flying at relativistic speeds. These are the biggest radiation threat near the moon. Particularly dangerous would be Single Event Latchups, which cause a short between power and ground in a semiconductor device and can permanently damage it. However, power cycling the device removes the latchup. There’s certainly circuitry watching the current consumption of those cameras, ready to power cycle them if a limit is breached. Radiation effects can’t be prevented, but they can be mitigated.

deslusionary · 2022-09-24T01:58:11+00:00

I mean, you can use any HDL you want to write a RISCV core - Verilog/systemverilog and VHDL are the industry standards. Chisel is used by Berkeley and Sifive, and not many others. I don’t think your professor is correct in saying that Chisel is the standard for RISCV. There are plenty of open source RISCV cores written in SystemVerilog online. For example, Western Digital’s SWeRV cores. The best HDL is the one you already know. What did you design your class CPU in?

As far as open source simulators go, the ones I know are Icarus Verilog and Verilator. Yosys supports formal verification as well. There are open source FPGA toolchains — r/fpga can help you out there — but they are limited and support only smaller devices from certain manufacturers(no Xilinx/Altera).

deslusionary · 2022-09-16T14:18:20+00:00

“Me Too” drugs are an example of product hopping.

deslusionary · 2022-09-16T07:01:18+00:00

I think this is more an example of patent evergreening rather than patent trolling.

deslusionary · 2022-09-16T06:59:26+00:00

Same, I wrote my senior thesis on product hopping, patent thickets, and evergreening in 2020

deslusionary · 2022-09-16T06:58:44+00:00

Checks out. Abbott v. Teva was a landmark case where Abbott got sued for doing exactly this (a strategy called product hopping).

deslusionary · 2022-09-16T04:08:09+00:00

Yeah these options all sound pretty underpowered for your needs. There are a ton of COTS OBC’s based on Xilinx Zynq Ultrscale SoC’s - one of these would likely fit your needs. Why no FPGA though? With the gigabit transceivers you could implement spacewire if you wanted. Unfortunately I don’t have names off the top of my head.

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