So would you recommend the QSX as a good way for a beginner to get to explore all the different bands/modes? Do you think this is a good replacement to - say - a hackRF? Or is the hackRF better for specific use cases like debugging because it has wide bandwidth?
can you explain how QSX is different from the other SDRs being mentioned (ADALM-PLUTO, HackRF One, etc)? Is it just more transmit power than those other SDRs? I feel like i'm missing something.
I don't think i "get" echolink. You hook up your radio to your computer (somehow? I don't know how i'd do this with a baofeng) and talk into it and then it uses the internet to send that across the world to other peoples radios who are also connected to their computer? It just feels like a discord voice chat with radios as the input/output device. Am i missing something?
So what lower-cost radio do you recommend to get started on non-voice bands? I see the bitX40 people made a new model called the µBITX. What bands and protocols will that open me up to? I also looked at the RTL-SDR but thats receive only and i'd like to do some transmitting and explore my options. Basically just looking for a cheap option that lets me explore the most bands/protocols.
As someone who went from nothing -> Amateur Extra when i was 23 (25 now) from a random spurt of inspiration to learn ham radio and then promptly did nothing with the license i agree with this.
I don't know exactly what i was expecting from getting the license but i will say that i didn't expect it to basically just be dominated by old conservative men who don't appreciate younger folk stepping in on their air space. I have yet to actually speak to anyone because i don't feel like there is anything i would want to say.
Part of me was excited to do things like decode ISS transmission or send digital packets around the world; but i wanted to ease into the higher cost HF equipment with a simple and cheap as chips baofeng UHF/VHF radio (i know, its garbage but i like i said i wanted to ease into the hobby) and when i discovered there was nothing to do but listen to old men rant i just shelved the radio.
I considered getting the bitX40 but never ended up doing it because i don't own the house i rent and putting an antenna up seems like a lot of work for a place i might move from soon. Admittedly maybe my problem was getting a baofeng UHF/VHF instead of something that i can plug into my computer and do digital modes with. But no one was really around to help me decide what to choose or give me insight into what i may want to do with my new AE powers.
Huh i guess i made a bad assumption. Though i'm not surprised they make peripherals and work with the fabs, i just assumed it stayed away from it as much as it could.
ARM designs processors, but just the processor. I̶t̶ ̶d̶o̶e̶s̶n̶'̶t̶ ̶a̶d̶d̶ ̶p̶e̶r̶i̶p̶h̶e̶r̶a̶l̶s̶ ̶t̶o̶ ̶i̶t̶;̶ (also wrong here, apparently they make plenty of peripherals)., that's the job of the vendor who uses the processor and integrates it with RAM, Flash, protocol hardware (SPI, I2C, Serial, USB, etc), Timers, and all the other goodies that make a microcontroller easier to use because you dont need fifteen other chips to get it doing what you want it to do.Imagine needing to buy a separate chip so you can speak I2C, another to speak SPI, another to have a counter running and interrupt the processor every X seconds, another to store program memory, another to convert analog signal to digital; it would be unwieldly, so these vendors take the processor and attach these peripherals and say "the processor can use this peripheral by writing 0xAB to its register located at 0x12345678.
So you can think of ARM as designing the engine, and the vendors as taking the engine design then adding the rest of the cars features (chassis, electronics, navigation, etc) around it, then building and selling it.
"Why don't the vendors just design their own processor to go with their own peripherals?" you might ask. Well designing a processor is MUCH harder to do well than any of the individual peripherals. There is a lot more going on with a processor and it's at least an order of magnitude more complex than any of the peripherals that go with it. But that doesn't mean it's not done; Atmel designed the AVR architecture and this is the processor architecture that dominates the Arduino world. Atmel sells microcontrollers with their AVR architecture processor and their own peripheral designs as well. But AVR is mostly 8-bit and they can't compete with the performance of ARMs 32-bit designs; which is why you see ARM is most embedded applications.
The design for the processor is made in a program that lets you "lay out" the hardware at the transistor level and specify processes for it (like a lithographic mask) but ARM never carries out these processes, these must be taken care of by a fabrication facility. Oftentimes these vendors don't even have fabs themselves, they just design the rest of the "car" and then have it fab'ed by a third party.
~A̶R̶M̶ ̶d̶o̶e̶s̶n̶'̶t̶ ̶w̶a̶n̶t̶ ̶t̶o̶ ̶d̶e̶s̶i̶g̶n̶ ̶p̶e̶r̶i̶p̶h̶e̶r̶a̶l̶s̶ ̶a̶n̶d̶ ̶f̶a̶b̶r̶i̶c̶a̶t̶e̶ ̶c̶h̶i̶p̶s̶ ̶(̶i̶t̶ ̶d̶o̶e̶s̶n̶'̶t̶ ̶e̶v̶e̶n̶ ̶h̶a̶v̶e̶ ̶a̶ ̶f̶a̶b̶,̶ ̶n̶o̶r̶ ̶d̶o̶e̶s̶ ̶i̶t̶ ̶w̶a̶n̶t̶ ̶t̶o̶ ̶d̶e̶a̶l̶ ̶w̶i̶t̶h̶ ̶3̶r̶d̶ ̶p̶a̶r̶t̶y̶ ̶f̶a̶b̶s̶)̶.̶~ (Looks like i'm totally wrong here, also why doesn't HN have strikethrough comments implemented?). They do what they do - design processors - and they do it really well, so well in fact that vendors are more than willing to pay for a license to use their processors in their own chips so that the vendor doesn't have to deal with the headache of making a really good processor.
Been using a 2010 15" Macbook Pro since i found it in the dumpster in 2014 (yup...), it was my first ever time owning a macbook and using OSX (outside of some time on friends computers, etc) and i love that thing. I used linux before but wasn't so hot on the grueling labor of repairing simple stuff, and so i was stuck on windows coming from a windows-fanboy past - now i am a huge OSX fan for its combination of ease of use and POSIX compliance; but i refuse to buy any new macbook pro.
I want my magsafe charger, i want my displayport and ethernet port, i want my CD drive, i want to be able to replace the battery myself (done it twice), and to swap hard drives (done it four times) and RAM (once) easily, I want physical keys for escape and media buttons.
I have gone so far as to personally take out the motherboard and replace a single tanatalum capacitor with an aluminum-polymer capacitor (requiring me to scrape off some of the soldermask off so i could solder to the ground plane easier since the Al-Poly cap is much larger) because the tantalum one was causing GPU kernel panic crashes. (Big thanks to Louie Rossman for the tutorial video!)
I've brought this thing back from the brink of death many times and i will continue to do so until Apple cleans up their act and makes a true developers laptop again.
Semiconductor Device Fundamentals by Robert F. Pierret was my go-to for undergraduate text. The diagrams speak a thousand words and Pierret is a funny dude. Builds everything up from basic quantum.
Don't mistake it with his graduate text, Advanced Semiconductor Fundamentals, though. That's also a great text, but very short and focuses almost exclusively on the quantum aspect without getting too much into the higher level meat of putting it together to form devices.
For a comprehensive guide, though, Physics of Semiconductor Devices by Simon M. Sze was my reference bible. It's big and bulky, very heavy on the first principles math and physics, and has everything from quantum to devices and variants on devices.