ฝัง
- เผยแพร่เมื่อ 2 ต.ค. 2024
- This is the next video of the bonus series where we want to build a ground station for the geostationary QO-1100 satellite and contact a station in Antarctica. I will not repeat the content of the previous video. Sot it is highly recommended to watch it first if not already done.
But first I have to thank you: I asked if I should continue with the series. And you responded: The video got four times the amount of comments than my other videos. And most were positive or even enthusiastic. So let’s continue with the Bonus series.
I am a proud Patreon of GreatScott!, Electroboom, Electronoobs, EEVblog, and others.
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50W Attenuator (not tested): s.click.aliexp...
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Thanks for the great info, the explaination of the signal paths and the dangers of not connecting load/cables to the o/p's was a great touch :)
Glad it helped
I still giggle *every* time I see that hand on a stick
But it is so useful - lot better than a finger and funnier then pointer :)
I love his orange transparent version too.
The orange is the original from the 90's
It's an overhead projector relic, isn't it?
Thank you for continuing the series, interesting as always.
My pleasure!
Super! Even managed to acan the qr code on the back of your license and the office on the 4th floor.
:-)
Andreas, thank you for great explanation. Your videos are great. If the comments can support, we can do that.
Comments are always motivating. Thank you!
It was already hard to convince the wife to get this one - lol
Yes, it was!
only knows who has one - a wife, i mean.
Was it „You already have 5 of these devices“?
Great project..... I had just started building my own QO 100 station. Downlink is functional (40cm dish, TXCO modified LNB to 70cm into my FT847), now working on the uplink. Looking forward to your next videos ! 73s de Thomas F8DBY
40 cm is small! I will start with 80cm. Which LNB do you use?
@@AndreasSpiess I am using the TXCO modified LNB from qro.cz, it works really well, the frequency stability is very good. I had tried others too which I had lying around, unmodified, they all worked but of course frequency drift was abysmal ! 40cm is a small dish indeed but it works, I have the CW beacon at S5-6. Yesterday I installed an oval 50/60cm dish (horizontal oval), which is giving me an extra + 1 S on the scale. My coax feed line from the shack to the dish is quite short though, only about 3 meters.
👍 Perhaps consider a series of videos on HAM (Amateur) Radio. Your style would lend itself to be informative and entertaining.
(I do understand how much time is involved in video production so I recognize this would not be in conjunction with all the other topics)
This channel stays centered on sensors and microcontrollers. There are quite a few HAM channels around, so no need to add one. This project is an exception and only because of the wish of my Patreons and subscribers.
Dear Sir, amazing 😘 amazing job, good thing that the XYL allowed the purchase of the second attenuator hehehe. Although perfect description
This was below the budget she controls ;-)
@@AndreasSpiess hehe long live the ebay and alliexpress... I guess a bird one would set you back several hundreds?
Very good bonus video series! I'm looking forward to the next episode.
Glad you like them!
THANK YOU for showing and using a torque wrench on your SMA connectors! On addition to the "real" metal kind you showed (that cost around $200 US new), there are some composite plastic ones selling for around 30 US that do a decent job. Observe minimum radius rules on microwave cables. Also, look for an HP 11693A Limiter to protect the front end of your spectrum analyzer; they show up on eBay every so often.
Mine is of metal and you find a link in the description. It is around 20 dollars. Maybe not accurate, though. I did not test.
Re: Receiving signals from geostationary satellites. I have a little tiny Pioneer Inno handheld receiver for XM satellite radio, the size of a Walkman, and it can receive signals directly from geostationary orbit. Signals which are hundreds of channels of lovely stereo music, or BBC WS. I can bring it outside anywhere in North America, and listen to satellite radio. I still find that amazing. Cheers.
I assume those satellites work with higher power. So it is easier to receive them.
Much easier. The handheld receiver's antenna is inside a little plastic cylinder just 1 cm diameter by 2 cm high. On the other hand, the bandwidth of reception is presumably about MHz wide to accommodate so high a data rate to provide each boquet of channels.
I have to keep reminding myself that the XM satellites are in geostationary orbit, so far away.
This episode brings back so many many MANY memories.
In 2006 I was introduced to our company's satellite ground station. I don't remember all the specs we operated "new" I.P. MPLS across multiple birds. But we were using unused Ka / Ku bands and channels between 13 and 40 GHz. I honestly cannot remember what the broadcast power was. The teleport's 15 meter parabolic reflector dish had this huge fence around it with massive warning signs not to stand within 20 meters from any 90° position of its aimed direction, a bird in geosynchronous orbit at 36,000 km if memory serves. It required some power..
I just cannot remember!!
Btw, there is an excellent 2012 Antarctic Satellite white papers online for those that wish to read them.
I always knew that those satellites existed and saw the big antennas. I could not imagine taht I would be able to use one myself!
Very well explained video, im looking forward in this series :), i didnt know that power meter, at 25 dolars its very handy, i will buy one. The torque wrench also its very important, its difficult to fasten the SMA connectors by hand, and with a regular wrench it often gets very tight. A loose SMA connector can increase the noise figure, especially before the first LNA, so its a important thing, google for "MEASURING THE NOISE FIGURE OF AIRSPY AND HACKRF SDRS IN REAL TIME" and you will find and interesting RTLSDR blog entry :)
Thanks for the link. And too tighten might damage your instrument.
Thank you for posting a follow up to this. I'm learning a lot and still have a lot to learn :)
My pleasure!
Thanks for the continuation of the series Andreas. It's really instructive to see a process broken down scientifically, clearly, and methodically. Even though most of us are not planning to speak to Antarctica any time soon, the concepts and problems involved are all great to see here.
Thank you for your nice words. I try to include a little "general knowledge" in the videos.
Hi Andreas, thanks for the video - I was looking forward to it! There is a typo in the title, 2.5 instead of 2.4 GHz :) How is your finger?
I thought I changed it yesterday... Now it is changed. Thanks!
"displacement can only be replaced with more displacement" 👍, good video as always, keep the series and other videos coming 👍
It's all at the pure cubic doll-hairs
That's the plan!
Must be hard to persuade your wife to invest in all such tech boxes she most likely does not unuderstand - even I do not really understand, but at least try to follow this journey and adventure to your Neumayer Station visit by language.
Good luck with the next steps and hopefully your wife will agree that it is at least a bit of fun to watch or follow your journey. Maybe she preferrs the practical things like that automatic "solar or sun protection"....
Usually it is not too hard. At least the not so expensive things...
Looking forward to the next video in the series!
:-)
This is just awesome, I definitely want to play with this.. I just have to figure out have to get the proper license my self..
Good idea. Not too difficult anymore without the Morse.
@@AndreasSpiess I was a radio operator in my time in the army so I guess I shouldn't be to hard, we had quite a lot of radio and antenna theory. Some still remain even if it's been a couple of years ago.. Like 28 to be exact.. And even morse doesn't scare me. I received it trough inheritance, my mother was a radio telégrafist in the merchant fleet back in the 60s..
@@oleeide9763 - in the US the ARRL is now doing HAM radio license exams online (Covid :/ ). Maybe other countries are doing similar...
It was a video with useful information. I watched with pleasure. thank you.
Glad you enjoyed it!
@1m20s: "...I have a Ham license since 1977..." Me too. February 1977. .... .. .... ..
I do no more remember the month. So both of us are already old farts...
Well at least I read „Radiobasteln für Jungen“ by Heinz Richter pretty much in those years, so I fart smaller farts. Thank god for still not having olfactory videos.
If you subscribe to Hugh's satellite internet service, you'll get a 2.0-2.4GHz, 20 watt, TWT and driver module as part of the installation. Keep their service for 2 years and it's all yours to point wherever you like.
Good point. I do not know if the sell their service around here...
@@AndreasSpiess They do in Switzerland, South Carolina, USA. Close enough, right? ;o) I like this experiment, Andreas. I'm not sure what you want to accomplish, but that's not as important as the science of getting it done!
Learning!
Great video and it is a pleasure to follow you on your channel - Please go on it 📡📡📡
Thank you very much!
I always judge the output power of my rf devices by how much it tingles when coming near the antenna
The fluorescent tubes in my neighbors bedroom are perfect for tuning :-)
Oooh, you get a nice plastic card for your licence. We in the UK get a website and a link to download a PDF file :/
Also, "20w is too much" makes me laugh, as I use my 250w amplifier all the time 🤣. Granted that's doing about 50w on DATV, but I can use it on NB too, I just add 20db of attenuation so the 68.5db amplifier doesn't de-orbit qo100 :).
We have to pay 150$ a year for this "plastic card" :-(
I now have a 120cm dish and only need a few watts for SSB. Unfortunately I still have issus with my Adalm Pluto and the Ethernet connection to SDR console. So I am not QRV.
@@AndreasSpiess Have you done the grounding mod to the Pluto? The locking up when using ethernet comes from a difference in ground references, which flips the pluto back into USB mode, taking it out of OTG mode.
I fixed it by soldering a wire link across the choke on L7's ground.
I did not do it yet. But I will do it now... Thank you! I think that my Ethernet does not share the same ground. But anyway, it cannot hurt!
@@AndreasSpiess The difference doesn't need to be much, 250mv AD says here under "Why do a Rev C", but it's enough to pull it out of host mode and put it into device mode. wiki.analog.com/university/tools/pluto/hacking/hardware
They suggest changing a resistor, but when you see the size of it, it's just easier to join the grounds together :).
Bravo! Thank you Andreas for giving us such gift with your videos!! (popcorn popping while waiting for next!) Keep up with your GREAT job!!
My pleasure! Maybe already next Thursday evening...
I keep on forgetting that 2.4 GHz was ISM long before it was WiFi :/
Andreas, you now have a license to kill...
... every home Wifi router in the neighbourhood.
I do not use the ISM band. I use the radio amateur definition of it. Similar frequencies, other rules...
First of all, you are just full of information! How you remember all of that and not burn up $200+ device.....!!!! I can't keep up, but I love to at least learn something I'll probably never do. Thanks for such a great videos Andreas! Stay safe and let us know how much longer is your finger out of commission? Heel fast and well!
I try to include also stuff for "normal" people like dB/dBm or how to treat SMA connectors... The finger has another 3-4 weeks to go, if all is ok.
@@AndreasSpiess Well, lets get that finger fixed and time does that anyway, I hope! Yes, you do cover many subjects and I like that about you and your videos! Have a great weekend!
FYI: SG-Labs in Bulgaria makes a rather cheap (€126,-) 20W amp and also nice transverters. Analog Devices RF Amplifier 2.4Ghz EVAL-CN0417-EBZ Kit with 1W could be handy, too..
Edit: Did you really go for a Siglent SSA3032X for 3kCHF instead of just hacking a 21X to 3.2Ghz? :) I wouldn't stack attenuators like this (leverage) - cables are fine.
1. I know, but he was not able to deliver to Switzerland (COVID)
2. I was one of the first customers a few years back. And a wanted to cover 2.4GHz. So no hack was available
Meh. 20 watts will be fine. :D You've REALLY gained my interest with this project! Makes me sad I scrapped my dish a few months ago!
They are not very expensive...
Really enjoying this series - looking forward to the next instalment 73s
Thank you!
@@AndreasSpiess hey Andreas
Culd you please use you spectrum analyser
To show .. why ther is a difrence of 150kc from carrier.. Up or down
I am tired of retards..trimning ther radios to be in the middel .. not upper or power side band !!
Ther is 300kc betwin upper and power .. right
A lot of people don't fully understand that SSB is AM. What most people call AM is actually DSB with carrier. Interesting here in VK standard and advanced licenses get to play in this 13cm band without special licenses from ACMA. Advanced get a full 120w constant or 400w PEP. Of course our friends in USA get 1500 PEP if they get that band. That's way more power than you'd realisticly need especially when running lots of gain on the antenna. For any non hams reading this the most important thing is line of sight. This is why NASA still hears Voyager 1 and 2 and big dishes and modern DSP. They're 18+ hours away at the speed of light. They don't run a lot of RF power considering how far away they are. So RF power is not all it's cracked up to be. Can't wait to hear your QSO.
I do not want to dig too much into radios. Otherwise I lose most of my viewers ;-)
Something to point out here, these generations of amplifiers (they're all made by a single company, main chinese amp) did NOT have support for wifi modulation and bandwidths, they were straight dirty PAs. Now you can buy specifically crafted ones supporting 802.11 modulations, as well as bluetooth modulations.
Thank you for your additional info. We use SSB (very narrow signal) for the QO-100
Another great video Andreas, thank you.
I just wanted to add a bit regarding the SSB. With the conventional amplitude modulation AM we transmit the carrier (tone) and the modulation signal's spectrum on both sides of it with the amplitude of 50% of the carrier for 100% modulation (i.e. when the modulated wave goes down to zero). If we assume that we modulate with a sine wave, the power, transmitted in each sideband, is only a quarter of that of the carrier. The SSB cuts off on the carrier's power (as you can see on the displayed spectrum, not completely in practice), and on the other sideband. Overall it becomes 6 times more power efficient in this scenario (sinewave modulation). Power saving when idle simply comes from the absence of the modulation signal.
Thank you for your info.
Ah - this brings back memories of working the LE Russian Sats (2m/10m) in the 90s. 5 Watts and a couple of coat hangers on a broom stick. "What are your working conditions, OM? .... Er, What????" I also contacted the MIR space-station with the same broomstick.
Interesting! For me the geostationary location is very handy because I can save the whole antenna movement mechanics.
6:46 Could someone please clarify why he used a 20dB (max 10dBm) amplifier when previously he explains that he only needs to amplify 1dBm + 5dB => 6 dBm? Does this mean he is passing 10dBm of power (10mW), i.e. 4mW more than needed?
Also, when you say an amplifier is capable of 20dB with max 10dBm output does this mean that it is capable of amplifying by +20dB but up to a max output (10dBm)? This makes sense, but just checking. This means a 0dBm signal will be amplified to 20dBm, but due to the max cut-off the amplifier will only supply 10dBm. However, if the signal was say -20dBm, it can be amplified to 0dBm (1mW), right?
1. I take what I get. So an amplifier with more gain is ok becasue I can reduce its input signal.
2. Yes. You read the specifications right. 20dB amplification up to a max output of 10dBm
@@AndreasSpiess thanks for the feedback Andreas. Switzerland, specially Geneva, is a very special place for me. I have family who are now Swiss. I used to spend many of my University related vacation days in Geneva. I have a deep seated obsession for horlogerie and collect Patek watches (and a few others - I have many videos on my channel). I’ve travelled through Basel, Bienne to the Omega museum, and also spent time in Zürich. I dream of when I can visit again! Thanks, Best Mike (from Sri Lanka).
(P.S. I finished my EEE bachelors and MSc in Mechatronics many years ago in the UK; now I mainly tinker in my homelab as a hobby.
At University we started with microcontrollers before GitHub or Arduino existed. I ended up writing my own C/Assembly libraries just for SPI or I2C, even PS2 to talk to a mouse!)
... well you have contaminated me :) (... but not covid).
Since Italian regulation give me the opportunity to get Ham Radio License without exams, I sent my License Request end of Jun by "Posta" (a big envelop with all the required certification, strictly paper)... Still waiting for an answer :(
It became quite easy these days. No mor Morse...
Nice one! Glad so many people like this and you are going on with this series.
We will see how this one performs...
Thanks for sharing! You are doing an amazing job in explaining this. I had almost bought a pluto two years ago, I should have done it...
Oh well... there will be more chances to get one. Best regards and 73 de PC4AD
Today I got a second one because this one is now fixed in the project. They had 500 in stock ;-)
Quit good next step to "our" goal. Where did you get the Lottak attenuator from? The link to the SMA torque wrench via Aliexpress is already broken (may be only in Germany). 73, Martin DG6MS
1. My supplier is no more online. But I found one which looks very similar: s.click.aliexpress.com/e/_dZAOLLB
2. The Link to the wrench works here. Do you use an ad-blocker?
I make globally control system using ESP8266 NodeMCU, Android app
Would you like to help me pls to complete my project, if you have any paper explain this method.
I am a TH-camr and share my knowledge in my videos.
Thinking more and more about getting a license! Thank you for your videos.
Go for it!
I have never assembled 2.4GHz parabola antenna, HG2424G. If you want, I'll send it to you at shipping cost from USA.
Thank you. I have such an antenna in my basement. So far, not used :-(
The Pluto needs a filter in the TX chain to suppress the spurious signals, e.g. www.taoglas.com/product/airvu-bpf-24-2-4ghz-band-pass-filter/
73, DD8PL
I will check if this is necessary. So far I did not see many projects using it.
Hi Andreas, any idea what the input impedance of the cheap power meter is? Is it 50 ohms, or something else? I don't see it listed in the specifications for them online.
It should be 50 ohms. And you have to add a lot of (50 ohm) attenuators anyway...
I believe this power requirement is an overkill, but I don't know yet, how you will transmit the radio signal. Many years ago I have programmed satellites, and we used a precision dish with an atomic clock mechanism and then the transmitter required just something around 1 Watt of output power ... also because the satellite receivers are very sensitive and it is pretty easy to destroy them with an over-powered transmitter.
We will see. I for sure will not start with the biggest power ;-)
Thank you Andreas. I'm looking forward to the next instalment.
Coming soon!
Andreas I made a project with raspberry pi for a mobile transceiver like experience, it uses the mumble protocol and is a fork of talkiepi, if you have time please check it out its call talkkonnect and would love your feedback. I love your videos and thank you for them.
Nice project. I did not know the "Mumble" project.
Is there some way to check the rating of the torque wrench? I have one but I am unsure if they sent me the 0.57Nm I ordered or a 1Nm one. The paper that came with it says the manufactured value is 1Nm, but it is unknown to me if this has been adjusted prior to being sent out...
It should be possible. But I am no mechanical engineer ;-)
I am currently looking into the chinese 20dB LNA pre amp. Do you think it would also work as a RX pre amp near the antenna if you have to use a lot of high loss cable between antenna and receiver?
Maybe. But the LNBs already have amplifiers and you do not need one
Hi, you modified your PlutoSDR to be able to feed in the reference clock? Is modification hard or simple? Thanks
You have to be able to do SMD work.
Sorry for my poor English, but i have tried the low cost power meter beetween HP ( 437 ) power meter and the low cost power meter is a gadget but not a real mesurement device . Best regards .
If properly used with attenuators it works ok. I did not test it, but there are some tests in the internet.
You can produce a Echo off the Moon with one watt in the HF range. To a Satellite you should do fine with a watt at 2.0Ghz. Look at the power you use to receive Satellite TV. Your operating in the Pico Watts range.
Its not bad have spare power, you can compensate for long cable runs, use small and lower gain antennas at the uplink, and if all its good, you can always reduce the drive level at the SDR and the 2.4ghz power amplifier will heat less lot less and be happy :)
We will see. EME stations usually use quite some power and high gain antennas...
Well, of course "to receive Satellite TV" you do not use any power, the power is used by the satellite. This will have around 100W of output in a quite directional antenna to give a strong signal on the ground which you can receive with a small dish.
When uplinking to the satellite, to get sufficient power at the satellite receiver you need to send up a specified amount of EIRP (Effective Isotropic Radiated power), which essentially is the transmitter power multiplied by (or with dB: added to) the gain of the antenna relative to an isotropic radiator. (antenna gain is due to bundling or beaming of the signal)
The QO-100 satellite requires a transmitted EIRP of about 57dBm which can be achieved e.g. by transmitting 40dBm into a 17dBi antenna, or 30dBm into a 27dBi antenna, etc.
It is for everyone to decide what is a better combination. A normal satellite dish (80cm) would have about 23dBi gain at 2.4 GHz so you require about 34dBm or about 2.5W of power. With 5W you should have ample power available.
My configuration can go down to 100 mW. So no worries.
@Syme Doubleplusgood Funcube is in a LEO orbit at about 600 km, the Iridium constellation is also in LEO at about 700 km. QO-100 is on a satellite in geostationary orbit, at 35.786 km. Satellite terminals use power amplifiers from 50 W, up to 1 kW. They also have high gain dishes, so the output power is even higher.
I like to start learning MicroPython since I have Python knowledge. Can you please recommend a learning kit?
Google will find you an interesting project. Start with it. That is how I learn
Again a clear and useful information from Switzerland !
TNX Vy much Andreas !
My pleasure!
Thanks. I will not be building this project. Still enjoy watching. Voyeur?😃
No problem with me!
Hi Andreas, Have you a link to download software of Cheap power meter foc PC? thanks a lot 73's
It is in the passion radio link in the description: www.passion-radio.com/swr-power-meter/rf-power8000-926.html
How Do We Get 2000 Watts Output on 2.4GHz, not wifi? Microwave oven magnetron.
True. But maybe not too useful for communication ;-)
Exellent video as always, i have the 8w amp with only the tx all the time mod have not tryed it yet but will soon. 73 de LA4XUA
I read teh 8W in reeality is more a 2W amplifier. But we will see if it arrives. 73 de HB9BLA
@@AndreasSpiess yes but most get with some minor modding about 3.2W out of it and with a 90cm dish its more then enough for the narrowband transponder.
I was scared at the "at least 20W output" part..
No worries. It ended up as heat ;-)
That is really interesting. I am looking forward to the next episode.
Glad to hear it!
i hope your part comes faster than my random electronics
ordered stuff on march 5th and still waiting 🙏
I also get the things ordered beginning of March :-(
meanwhile I have stuff lying around since march but I'm not allowed in the lab to solder and test it
I did as well, however few things arrived already, even those ordered later. I am starting to believe Aliexpress now does not tell true info in shipping information.
Andreas .. you are amazing thaaank you so much 🙏🙏🙏
You are welcome!
Nice video! ❤
Unfortunately almost all of the links are not working
No wonder. This video is already quite old and things change quite fast.
Thank you for another amazing video Andreas! 20W is going to be plenty. I managed to get CW with only 100mW. You can check out my setup on this tweet: twitter.com/DrenImeraj/status/1244341645715353600
Cool! Only a Helix is not a lot of gain.
@@AndreasSpiess yes, of course! The helix is screwed on the LNB mount, as you can see. I then use a 1m dish as a reflector.
I think it's more simple to communicate aliens then QO-100 🤣🤣🤣
I hope not ;-)
Excellent video. Thank you! W2RSB | F4WCM.
You are welcome! 73 de HB9BLA
My licenc cover bands Up to 750.000.00MHz
Tooo lengthy better to be up to the point and do not try to explain everything in detail like that your listener loose concentration and interest
Thank you for the feedback!
I have to ask the question now... Whats the call sign? Only if you want to share. Do you operate any FM or SSB. I am QRV for most bands and modes.
My call sign was on my license shown in the video: HB9BLA. I am QRV only on DMR for the moment.
No disrespect to you Andreas and this is no way critical of the quality of your videos, but I would prefer to see content on sensors and microcontrollers (which was why I subscribed).
As I said, these are bonus videos. Just skip the Thursday edition. Sunday stays the same
You can't be serious...
That's super cool! Can't wait for the next part!
:-)
Another great video! It is good to remember that +3dB is "twice as much"
Only for power, though!
Ok sir Andreia I am very interested in your project. I'm also the amateur radio here in Brazil.
I am an electrical engineer and would like to assemble this system according to your description
I've been watching your channel for a long time
Thank you very much for all your commitment and dedication
I AM SBY
LUIZ
RIO DE JANEIRO
PY1JW
I hope we will meet once on the satellite! 7e de HB9BLA
For the 2.5G uplink, do you use a dish or an array of yagi’s? If the 20W uplink power + antenna gain is sufficient depends on the available satellite up/down link budget. 8W could be enough with a clear sky, but a rainy day at the transmitting location and/or on the receiving location can put your signal in the noise. 73’s on5vb
I will start with a POTY and an 80 cm dish. 73 de HB9BLA
Andreas Spiess Nice solution. I was wondering how the feed construction would be.. I think the dish gain will drop about 50% at 2.4G. At the receiving side, is the selected freq deviation tracked in software? The local oscillator of a low cost lnb shall not be super stable.
I plan to show both possibilities
Really enjoying this series. RF projects are fascinating :)
Glad to hear it!
Memory flash back 25+ years here to when I was a HAM (ZL2...), we had just got a new R&S-52 spectrum analyzer at the office, a must have.
I still have my UV eraser and eproms with the 6809's. I have written a lot of embedded code since then.
I see you are 6 months older than me, cool :)
Old, but not too rusty ;-)
I wish they'd do more ham radio testing online, at least here in the States. Last I checked, one still has to go to a testing center. Perhaps this will be one of the silver linings to come out of a global pandemic. I want to get my license and talk to satellites!!
Good luck for your test!
@@AndreasSpiess Thanks!
Hello. Wonderful video, very rich in information. It will help me a lot, as I am planning to access the QO-100 and make many Dxs. Thank you for sharing. Hugs from the friend of Brazil, Miguel, PY1LO
73 de HB9BLA. See you on the satellite!
We built this PA, it works quite well (and building/testing the circuit is a very nice excercise to learn about measuring equipment for a EE student like me) and is a lot cheaper than anything you can buy.
www.helitron.de/dj0abr/english/technik/sat/sat_pa_stage2.htm
Good work. Which one did you build? The 10 watt or the 30w? The 30w transistor alone is 120 $. Very dangerous;-)
@@AndreasSpiess It's weird, I think something massively increased the price. At avnet, it's only $35 each (minimum order 100 though), and I think I would remember the price if we paid much more than that. Certainly not 120€.
I'm just a student, the lab engineer did the ordering, so I never saw the invoice :D
@@AndreasSpiess I checked, it was "only" 45€
Awesome video. Well explained for those non - amateurs. How much did you say you had to convince the wife to to buy your spectrum analyser? :) ZS5MG
It is my most expensive rig. And when I purchased it I had maybe 1000 subscribers. But it was my dream since I was a young engineer. That is what convinced her ;-)
Can someone tell me why RF amplifiers are so expensive? Is it only the RF transistors?
Mostly. And the small series, perhaps.
@@AndreasSpiess thanks Andreas
Thanks Andreas for continuing. Was there a carrier present during your SSB test, it looked like there was a separate tone just to the left of the modulation? Keep going! 73 - Dino KLØS (ham since '69)
The sound of the spectrum analyzer ;-)
If you tell someone that you are trying to use SDR radio on Wi-Fi over satellite to talk to the South pole they will think you may have been in lockdown too long!
:-))
@@AndreasSpiess I have a CTT 66087 microwave amp with 40 dB gain. Would that be good for this project?
Won't this sort of power kill everyone else on 2.4 in your area?
I hope not. But on the otherhand: I could sell my invention to the military and get rich. Also a nice idea...
Brilliant Andreas, Im building a ground station but have far less knowledge than you, your videos are a great help.
Even basic things, like setting up the pluto from out of the box, networking little things like that can trip up the beginner.
When I get it working I look forward to giving you a call . thanks.
I am sure it will work in the end. My main Pluto still does not want to connect via Wi-Fi :-(
Andreas, what happened to your finger (6:43)? Did QO-100 bite it?! :D Thank you for great HAM radio content. 73!
The finger story was told in another video ;-)
I really like this ham satellite series! Just got my Swiss amateur radio call sign this week.
Welcome in the club!
Andreas The Master STOP This is a really complicated matter, but its seems like making a cup of coffee early in the morning on your hands... STOP
You should see my second hand. Also bandaged...
Hello Andreas. 16 years old here in India. What is the formula to convert db scale to linear scale?
Why you ask me? Just google
@@AndreasSpiess Ok. Thanks a lot👍. I was trying to derive myself.
thanks for your great detailed videos. one thing I observed on your spectrum analyzer screen was that carrier on SSB tx. is that some kind of extra carrier leakage from plutosdr?
73's de EP6DSP
The sound of the SA fan ;-)
The licensee is authorized to operate amateur radio stations in compliance with CEPT Recommendation T/R 61-01 in the countries which have adopted it.
That is why it has the QR codes for the different languages on the back, I assume.
For the receiver are you planning GUNN diode or transverter?
A standard LNB for 10 dollars. Modified for frequency stability.
@@AndreasSpiess Staying tuned for those modifications 🍿
Perhaps the spurious emissions result from intermod distortion due to the 28v boost converter. Would be interesting to power the module from a separate linear 28v supply?
They were already there before the PA, just less visible, but similar distance. So I will check again with the final GPSDO.
Look forward to *Receiver* & *Antenna!*
Hopefully next week...
I have watched many of your videos over the last few years. I am on a binge watching session this weekend and want to tell you thank you. I also want to extend a thank you to your wife for allowing you to continue with these awesome journeys across a series of topics.
You are welcome! I will tell my wife ;-)
I forgot to leave a comment on the last video, so I'm extremely pleased to see that my co-viewers covered my back. Thank you all!
You're very welcome!
Might be a silly question, can the nano vna measure RF power?
Yes, it has to measure power. But usually only very small levels and not "calibrated"
@@AndreasSpiess thanks for being such a great TH-cam channel, learnt so much, and you try to reply to so many comments! Inspirational 🍻