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- Опубліковано 9 бер 2018
- Everything goes wireless these days. This is why we have a close look at the “black magic” of antennas, how they work, what is essential, and how to test them.
Based on this knowledge we will build a cheap antenna tester for LoRa antennas. A similar device can be built to test Wi-Fi antennas.
It uses an ESP32 TTGO board on one side and a Wemos D1 mini with a Hope RFM95 module on the other side.
Links:
Sketches: github.com/SensorsIot/Antenna...
Stuart's Page: www.loratracker.uk/
and his results: github.com/LoRaTracker/Test-R...
Watts to dBm converter: www.rapidtables.com/convert/p... / www.g4urh.co.uk/amateur_radio/...
Radio link budget calculator: en.jirous.com/calculation-wifi
Coax cable loss calculator: www.qsl.net/co8tw/Coax_Calcula...
Ground plane Calculator: www.csgnetwork.com/antennagpca...
LoRaWAN Balloon experiment: bit.ly/2DgSBUB
Moxon Antenna: www.moxonantennaproject.com/
Moxon antenna 3D: www.thingiverse.com/thing:212...
VSWR to dB table: bit.ly/2IgrWuI
50$ satelite: www.50dollarsat.info/page1.html
Supporting Material and Blog Page: www.sensorsiot.org
Github: www.github.com/sensorsiot
My Patreon Page: / andreasspiess
If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission (of your purchases the next 24 hours) to buy new stuff for the channel
For Banggood bit.ly/2jAQEf4
For AliExpress: bit.ly/2B0yTLL
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Equipment in my lab: www.sensorsiot.org/my-lab/
nice to see my entire bachelor degree summed up in one video, great content !
I can't thank this guy who Andreas chooses to take his own time to share his huge knowledge with us, making video after video.
Good quality of video, sound, no annoying music in background, everything detailed. This tutorials we want to see!
Great video Andreas! Thanks for making this. I believe your videos on LoRa are among the best I've seen on youTube.
Great stuff - I do this for a living and still enjoyed it. Well done. :-)
Wow, this guy can teach! Great examples, sketches, equations, and experiments to make it clear and interactive. Also great narration.
Thank you for taking some of the mystery out of antennas. I always assumed that understanding them was simply over my head. Now I’m interested in trying to learn more. I look forward to future videos on this subject.
Your new microphone is great. It adds a lot to the production value of your videos. You sound professional. Very nice!
Never seen any RF tut as detailed as this. Even from time I was at Uni. This had me getting communication electronic...BRAVO
Content like you are producing is the real value of youtube.
I love the clarity of explanation in your videos. For me there were some good revision points and some new facts to take on board. Thank-you.
Yey another awesome video. Just what I need at the moment as I am working on a ZigBee based data logger system for work at the moment and antennas performance is a black art. Thanks for explaining this so well. Looking forward to the next antenna video. Thank you.
Excellent video, Andreas. I fly model aircraft at a flying field which is about 1.25miles (2Km) from my home. I have have a weather station at my home, which other club members can access, to check flying conditions before traveling to the field. A few of the members expressed concern about the accuracy of the weather data, even though the whole area is farmland, my home is at the same elevation as the flying field and I have no obstructions around my weather station. To appease these members, I placed a second weather station on an existing tower at the field and linked it to my home network, through a secure gateway, with an ESP3266 based link. Even though the readings were the same, they still preferred to have wind speed and direction readings right at the field. I made it a permanent installation using a solar panel, charge controller and a LiPo battery pack enclosed in a weather-proof enclosure. Using yagi antennas between my tower and the tower at the field, I am able to maintain a very stable link on 915MHz with only 25mw of RF power. You’re very correct about using good quality, short lengths of coax cable. Just like a piece of chain, an antenna system is only as good as its weakest link. As always, I’m looking forward to your next video! Take care! :-)
Dear Mr. Spiess I think this is one of your fascinating research. Let me congratulate you.
Thank you for your videos. They are very helpful to get a basic understandings for the technologies you are presenting. You find a good balance between practicality and theoretical background.
Hi Andreas, I really enjoyed watching this, although it has passed years since you put it down here, I have been searching for long trying to find a good explanation, here I am, Thanks a lot for your time and wonderful knowledge you have.
Normally, when I speak of RF, I would mention the many math equations to compliment the analogies. However, I like how it was compiled here. If one wants more information, then they can look it up later. Quite an efficient layout of information. Andeas, you gave useful information about debugging something invisible and get meaningful data out of it as well. This is such a good way, good work man!!
I've been an antenna / RF nerd for decades. This is the best explanation of all the important factors I've ever seen. (Also a nice review for the old timers) Good work!!!!!
I'm not studying any engineering but always was thinking of how this work. Exactly the content needed. Thank you so much sir for giving us your precious time
Thanks a lot, looking forward to the next lesson including the test gear and the results of your testing.