Very excited to see the radio board when its done! I'm a ham radio operator so I'm glad to see that you'll be using some of the amateur bands. I'm only now getting into electronics stuff, so while all this is absolutely above my pay grade, its inspiring to watch and I'm really excited to see the end result. Keep up the amazing work!!! Can't wait for the next video.
I manage an R&D company located in Yildiz Techinal University in Istanbul, Turkey.Our engineers and I are watching your videos as we are also aiming for the same goal. Ours is just a bit different but we love the idea and your determination. Kudos
Hey man, I just wanted to let you know that as a student currently working on a university CubeSat team with a similar budget, I really appreciate your content. Keep it up!
Don't get discouraged. Engineering prototypes are great. They allow you to work through problems that you never see on the drafting board/computer. Your multiple board cubesat design is flexible enough to allow choices of communications boards. EPS and Nav as well. Im following you to see your engineering process.
Please dont tell me you gave up on this project. I ordered some pcbs using your design. Not even close to the level of know how to build and sucessfully launch a cubesat. But your videos are perfect for entry level. If you need funding for the project let me know I can assist. Personally I have been looking at the purdue water thrusters with 10 micron orfice along with magnetic remdezvous. Wanting to build a 2u unit and 2 1U cubes that dock in orbit. Solar has come along way since this post. Tested flexible panels encased in epoxy personally works pretty well in testing. But again I am nowhere near the level needed to build and launch and dock in ordibit just experimenting and trying to learn want to launch one eventually.
Great work. Really impressed. I am following your channel for few months specifically to build $1000 cubesat. I want to contribute for software development. Please let me know how can I help.
My interest in your Cubesat project just peaked since you've decided to use a HAM radio transceiver instead of Iridium. Are you going to use the Great Scott Gadgets Yardstick One to test this radio board's receiver and transmitter? Don't forget to include a variable attenuator between your board and the Yardstick. You need to simulate about 400 miles of over-the-air path loss. I would love to build a duplicate of your CubeSat to follow along your design learn more. Please let us know how we can contribute.
@@RGSAT an RTL SDR is useful for conductive testing (through coax with an attenuator simulating path loss). GNU RADIO Companion will allow you to decode packets sent by your RF board. However, you might need a HackRF one with GRC or a Yardstick One to transmit to test the receiver. To do a radiative test (over the air) 420-450 MHz at 1 watt you will need your Amateur Radio license (part 97).
@@RGSAT Also the pathloss is often up to 2500km. I would definitely do a link budget assuming a low earth orbit and consider crowd sourcing the ground stations with both the TinyGS and SatNOGS for LoRa and FSK variants respectively.
Hey! You have very interesting content, I am following your work! I would like to ask a few questions (sorry for my english, I am writing through a translator): 1) Do I understand correctly that your cubesat is powered by a 1S2P battery? Is all equipment powered directly from the battery, or are boost converters used? 2) Which models of lithium ion batteries are commonly used in cubesats, and from which manufacturer? The decisive characteristic is the operating temperature range? 3) Does the number of batteries connected in series (1S, 2S, 3S) depend on the size of the cubesat and solar panel? A large enough panel can provide a higher voltage, which can be used to charge 2-3S batteries. After all, as far as I remember, the buck converters that will be needed to power the payload are usually somewhat more efficient than the step-up. Thank you!
1) I have 2 batteries in "parallel", but they are not connected to each other. Each battery has its own Battery manager chip. The outputs of the battery managers are combined. This is useful, since one battery could die, and it doesn't negatively impact the other battery. 2) I believe the cylindrical (18650) lithium ion batteries are popular, but I don't know which batteries specifically. Probably the batteries that can do more charge/discharge cycles. 3) Good question! I don't know what the right answer is. For a simple cubesat like mine, I decided to not deal with in-series batteries. Series lithium-ion batteries require balancing & more complicated chargers. There are a lot of simple 1S chargers on the market, which is why I went that route. I use a step up converter from my 1S battery to create 5V. It would have been nice to have 2S, but it's not that big an issue.
More off-the-shelf modules! At the low price I'm aiming for, I have to make everything myself. If you have more money to spend, then you can buy a compute module or radio module from a manufacturer
@@RGSAT and regarding radiation tolerance, how much time a cubesat like yours could stay functional in LEO and what kind of rad protection are you using?
I'm not sure how long my cubesat could stay function. I don't have any material shielding, I'm simply going to rely on current monitoring to detect SEUs, along with watch dog monitors for each of my processors
@@RGSAT are you considering a-shielding protection? Because of the lifespans of the cubesat will be 10 days it kinda misses the concept. (If I’m missing simething let me know🙏😉)
Hey not sure if you would be interested but me and a friend are highschool students at a stem school and we are working on a project that both you and me could benefit from. me and my friend are going to put a cube sat into orbit with a budget of 3k so we could collaborate and we can lunch it for you. We don't need you to pay us for it we might even be able pay you to let us lunch your design. Because me and my friend aren't good at electronics of this caliper we can do some Arduino like projects but can't really code.
It's not hard to get your HAM license so you can test your satellite over the air. Your local HAM club may have free lessons. It does not cost a lot to take the exam ($15). 73 (Greetings) Konrad WA4OSH
@@RGSAT There are four or five Amateur radio clubs that have volunteer examiners (VE) that administer the US Amateur license exams over the Internet. In foreign countries, the exams may be admisistered by the government or amateur radio clubs. You will have to research this.
@@RGSAT There are practice exams available for free at QRZ. You don't need a call sign to register. Once you've cycled through all of the test questions in their test pool, you will be ready for the test.
