Understanding technology is not easy. That's why Technology Master Kam is here to help. As a technology blogger, my aim is to make complex concepts accessible to beginners through KZread videos and social media interactions. I cover a wide range of topics including Ham Radio, SDR, Meshtastic, LoRa, digital communication, antenna designs, DIY projects and more. My passion for technology and desire to help others learn is what sets me apart. Join me on this journey and let's explore the world of technology together!
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Thanks for this straight-forward demonstration. It would be interesting to know how you came up with your dimensions.
Thanks. You can also add a BME680 Sensor pack to meshtastic for air quality telemetry. As well as tVOC gas resistance (air quality), it also includes temperature, humidity, and barometric pressure data.
Thanks for sharing
@@technologymasterkam Did you see on the Meshtastic website that there is a group of paragliders in India who are using Meshtastic for communications and safety for Pilots who fly in the Dhauladhar Range. 😊 There is a link to their website and telegram chat group in the local community page of Meshtastic.
@@technologymasterkam Did you see that there is a paragliding group in India using Meshtastic for pilot safety?
I am not in favour of using Meshtastic for safety, SOS and emergency mobile use. In my opinion, Meshtastic is not that reliable. For safety and 911 purposes, in a limited budget, get satellite communicator (Garmin etc) or at least a VHF HT (with good repeater coverage).
@@technologymasterkam I completely agree. . . For off grid casual communications I'd have to say it is very practical. The mesh in our city is really taking off. There are more than 100 active nodes.
Use ads-b demodulator t....not AM
For Signal Identification we are using eyes (FFT and Waterfall display) and ears (AM audio in this video). Here I explained kzread.info/dash/bejne/hqpmmc-mZ83TgpM.html that we are using AM to listen to the signal and will use ADSB demodulator for actual decoding of signal. I hope it clears your concern.
Hi great video. I have just thought about a j pole for meshtastic and watched your video. Great work. 73
Thanks for the appreciation and nice comment. A Great audience is the catalyst behind a great match. Best 73s my friend.
@@technologymasterkam not a problem at all. You did a fantastic job, well done 👍🏽 73 my friend
Please explain more. 2.4GHz is "old" WiFi. Thank you. ;)
Yes, 2.4GHz is old WiFi. I have a few videos on 2.4GHz Meshtastic band. Please let me know what you want to know and I will try to dig further into it. Thanks
@@technologymasterkam Well, a few things immediately come to mind. #1. The official Meshtastic frequencies are 433MHz / 868MHz / 915MHz. 2.4Ghz isn't an official Meshtastic frequency. The only item I can find on Meshtastic is if you actually use LoRA24 which is 2400.125, which is an extremely specific frequency. #2. Being that 2.4G WiFi is still heavily used worldwide, wouln't running a Meshtastic node on a WiFi frequency cause interference for both? (Unless I suppose using the precice LoRA24 frequency above?) Thanks. :)
Here is reply to your questions and assumptions. -Information posted about Official Meshtastic Fequencies is incorrect. Please check/recheck the source of information. -This is also incorrect. "The only item I can find on Meshtastic is if you actually use LoRA24 which is 2400.125, which is an extremely specific frequency." LoRa 2.4GHz band has 334 slots with a total bandwidth of more than 483MHz. This is the largest bandwidth available to Meshtastic in any band. -2.4GHz is not a WIFI band but an ISM band. WiFi uses this band with same privileges and priority as LoRa, Mestastic or DJI (proprietary protocol for VTX and control) is using it along with many others. How different services use the same frequency is a networking lesson for another time. However its basis comes from Ethernet Carrier Sense Multiple Access (CSMA). Present is far away from CSMA. en.wikipedia.org/wiki/ISM_radio_band Meshtastic uses LoRa protocol for its transceiver needs. Meshtastic/Lora 2.4Ghz band is an International band for Worldwide use. Its region setting is LORA_24. You can use it without license in any law abiding country. Here is the list of Meshtastic regions meshtastic.org/docs/getting-started/initial-config/ meshtastic.org/docs/overview/radio-settings/#frequency-slot-calculator If you still have any doubts or ideas, you are welcome to ask.
@@technologymasterkam Thank you so much for the additional information :)
Nice video. Would the reults perhaps e more accurate if the antennas were vertical and in free space ? I found that many antennas are easily detuned by laying them down on a surface. Also it would be useful to see a table of your results to se how the antennas compare to each other. Keep up the good work !
Please see inline. -Nice video. 😌 -Would the results perhaps e more accurate if the antennas were vertical and in free space ? I think there is no concept of accurate results without high accuracy test equipment. This video was not using any of those. Polarisation of antenna does matter. It has to be same on receiver as on transmitter. It does not matter if it is vertical, horizontal, LHCP or RHCP. For Free Space, here is my reply kzread.info/dash/bejne/Z3-lpMGql9unkag.html - I found that many antennas are easily detuned by laying them down on a surface. It is not always true. It depends upon the type of surface and the surrounding objects. Anything that can interfere with Magnetism will change the properties of the antenna. Even things can interfere with magnetism will have varying degree of effect e.g fibreglass has very little effect than copper. The table I was using had little effect for the purpose of this experiment. The lab where we test antennas for educational or commercial purpose is a different world. I do not have video of it handy. -table of your results. It is a good suggestion but as we can see video is already around 8 minutes. I just added something very important in the end but stats show that very few people have time and patience to find it out :) No player likes to play a difficult match without supportive audience. Luckily I am getting more and more interested people like yourself. This makes me devote more time and effort. Thanks.
Thank you, well done
Thankyou for making this video
My pleasure 😊
Yo tengo dos. En recepción genera mucho ruido y oculta las señales débiles. Pruébalo con un receptor SDR y verás la recepción.
Necesita un filtro de 433 MHz entre la antena y el amplificador. Sería genial si pudieras conseguir un filtro SAW. Si tiene una estación de radio FM cerca de usted. Tienes que ver este kzread.info/dash/bejne/oXieq49qctCzfqg.html Gracias por preguntar.
По русски объяснить можно😂
ОЙ! Да, я могу 😂
In USA, ~900-912MHz is used, NOT 2.4GHz. Check your meshtastic device spec page to see supported frequencies.
I have done my research before the video. I have already added some explanation (see comments below) and a link to Meshtastic website regarding 2.4Ghz International band. This is also available for US in addition to 915Mhz band.
Thankyou SO much for finding a way to simply explain all the meshtastic particulars that nobody else seems to address.....Greatful!
You're very welcome!
Hello. Heltec wireless tracker boards have a hardware selection of the operating frequency range. The jumper is located between the Lora and GNSS antenna sockets.
Please send me the source of your information, if you want to help people.
@@technologymasterkam The source of my information is an inspection and comparison of two Heltec wireless tracker boards. One for the frequency range 433-510 MHz, the second 863-928 MHz. The first has a jumper on the contacts designated "RLF", the second jumper closes the "RHF" contacts. I would also like to note that the printed circuit connecting the SX1262 chip and the antenna connector has a choke and two capacitors of unknown value. It is quite possible that the choke is an antenna extension coil. In this case, the matching of antennas of 433 and 868 bands will not be interchangeable. In addition to all of the above, I noticed that the antennas included in the kits are poorly matched to European bands. For example, changing the frequency from 868 to 915 MHz gave a significant increase in signal level, signal-to-noise ratio and communication range. The antenna of the 433-510 kit is tuned to a frequency of approximately 480 MHz.
@@technologymasterkamAn inspection of both Heltec wireless tracker boards 433-510 MHz and 863-928 MHz showed that the first one has a jumper on the “RLF” contacts, the jumper on the second board closes the “RHF” contacts.
you have 902.125 for long_fast in US but I have 906.875
@@isthereafeeforthis 902.125 is confirmed. You can have a different frequency due to any other configuration change. If you need further help, please share you configuration for LORA. You can see screenshot on my website for frequency calculator by Meshtastic. technologymasterka.wixsite.com/technology-masterkam/post/how-to-switch-meshtastic-915-mhz-868-mhz-and-433-mhz-bands-on-sx1262-devices-technology-master
only use it if u legally can plus it will amplify the noise too
My reply about signal and noise is in this video kzread.info/dash/bejne/fmdtz86GpJyvaJs.html
That looks really useful. Thank you for bringing it to our attention. Again, please provide a link to wher it can be obtained. Where are you located ? Is there more 433 or 868 activity where you are ? I have not yet tried it on 433.
Thank you, so nice of you. Here is url for RF amplifier www.aliexpress.com/item/1005006699272675.html Meshtastic is not happy with 433 due to duty cycle and EIRP limitations. However on 433 I have tried 2m and 70cm dual band antennas. They are economical, easily available more durable. Their performance is also great.
That looks very useful ! Where can I buy it ???
It is available on aliexpress. Available from many vendors. www.aliexpress.com/item/1005005445930926.html Option is Color: 868M Filter 2in1 B. I have seen people complaining and saying that they threw it away. In my view there are two most common reasons for problems with RF amplifiers. 1- Unstable and starving power supply. It has to be able to provide sufficient current with stable voltage when we are transmitting. 2- Is the overdrive. We should start at a lower dbm and keep increasing while keeping an eye on its performance. I know you are a master of Meshtastic, still adding my 2 cents. :)
@@technologymasterkam thank you for the info. Will take a look !
@@technologymasterkam Have you done any tests for the overdrive? it seems that the default TX gain is 0. Have you tried to increase it? What's the default TX gain that it comes with? What was the TX gain that worked best for you? And thanks for all the informative videos you create.
I have not tried overdrive as it is not recommended by Semtech and others too. I usually keep drive a bit below the upper limit given in the specs. It produces unwanted noise and signals due to unstable or over voltage. When using an amplifier, we can start with minimal drive and then increase it keeping an eye on the received signal. - I am not aware of any default value. I have seen different value from different manufacturers. Mostly it is 22dbm. If we increase this TX value in the software, actual transmission still stays at MAX e.g 22dbm. - I usually use 22dbm while using node without amplifier. In my videos I have shown what value I am using for a specific test or experiment. If I have missed it somewhere or if you have a question about a video, do ask :)
@@technologymasterkam I was asking if you've tried the different TX levels on the amplifier. From what i see, the amplifier in your video comes with a default tx gain of 0.
I don’t get it, if Meshtastic is operating only as high as 915/940mhz how does 2.4 help the Meshtastic node?
Meshtastic uses LoRa protocol for its transceiver needs. It is not limited to 940MHz. Meshtastic/Lora 2.4Ghz band is an International band for Worldwide use. Its region setting is LORA_24. You can use it without license in any law abiding country. Here is the list of Meshtastic regions meshtastic.org/docs/getting-started/initial-config/ If you still have any doubts or ideas, you are welcome to ask/share.
@@technologymasterkam Oh WoW! I had no idea, I thought it was just the tri bands ..... so there's people/nodes out there all meshed on 2.4ghz band? With this amplifier you have here on the 2.4ghz , roughly how far transmission would you think to get compared to say the common 915mhz ~22db devices here in the states?
It may not win in the long distance due to many factors causing more attenuation to 2.4GHz than 915MHZ. I have outlined a few of these factors in a previous video. I have just published a video in response to your comment as it may help others asking about 2.4GHz. Here is the video kzread.info/dash/bejne/lXmEz89roZOuqKQ.htmlfeature=shared
nice But u're talking tooooo much
ha ha ha. Yes that is true. I just don't want to miss anything that comes to my mind too related to the topic. May be I should drop more info. If you are missing something, please use CC. I could help in understanding what I am talking about. Thank & welcome to my channel :)
What does this do please explain in brief!
I know about mestastic explain another tool you have attached these
This is the main video. Tools used are explained here kzread.info/dash/bejne/fZlmx5Kuqdmqipc.html If need any more info about the video, feel free to ask.
Very useful - thank you !
Glad to hear that!
Great video. How did you get the board to transmit continuously ? Normally the pulses are very short. Does your power meter have a peak hold function ? SUBSCRIBED !
Power meter does not have the peak hold function. Taking reading of short pulses of LONG_FAST preset is really challenging. So I have changed preset to LONG_MODERATE which transmits for longer time as I explained here kzread.info/dash/bejne/fZlmx5Kuqdmqipc.html also details of presets and transmissions are here kzread.info/dash/bejne/q6imltuQnJqdfqQ.html. Board is not transmitting continuously but I send text message to take reading. I have not setup a node to respond to these messages, so it transmits again and again for 3 times giving me enough opportunity to record video. I show screenshot from recorded video to make it more easy for viewer to read. Thanks for Sub and posting your question. If you get any other question related to videos, do ask :)
@@technologymasterkam Thanks for your reply. I will try it myself sometime. Do you have a link to the power meter board you used ?
Sure, www.aliexpress.com/item/1005003950055977.html I guess these use AD8317 Chip.
Thanks for the video. Subscribed.
Welcome!
@technologymasterkam Thanks again, we're looking forward to your productions!
to do the bottom corners of the stub neatly without all that ugly crinkly bunching you get trying to "bend it" around the corner..... go flat/straight to the corner (say upper radiating element running left).. put a 45 degree bend on the flat to send the tape THE WRONG WAY flat with the sticky side upwards (ie going UP the page) but then immediately fold it back on itself to go down with the sticky side down for the bottom of the stub... then 45degree fold on flat to send the foil LEFT with the sticky upwards but then immediately fold back to run right with the sticky down to run the lower leg of the stub.... perfectly neat flat conductive corners with no bunching.
Thanks for sharing your thoughts. Short Answer: I just did what I planned to do. Long Answer: "Why are you doing it. Why don't you buy it. Look at your hands ..." I hear these things at times from people who in a way trying to help or guide me. If you look at my website, my tag line is "TECHNOLOGY FOR NON-ENGINEERS". If you check descriptions and tags etc you will find word "HAM" or "Amateur" frequently. I am not doing these videos to help professionals become more professional. KZread and Internet is already full of resources for that. I want to help anybody who wants to do it, just do it. What matters to me (fulfils my goal) is that it works. These antennas are not for sale. They are made with heart and love for oneself or friends.
nice one
Thanks
@technologymasterkam Apologies; I am having to reply this way, for some reason my "reply" button doesn't work in the comments. Thank you for finding the video on the matching circuits. I will be examining the various boards in greater detail, and read the values of the matching components for the three 915 MHz devices I have so far. A few months ago I also mistakenly purchased a Heltec LoRa V3 tuned for the 433 MHz band instead of 933 MHz, and wondered if I could simply reprogram the SOC to 915 MHz, but I got warnings from advanced RF people to look carefully at the antenna matching network before doing so. They said this is because even though the SX1262 supports multiband antenna matching, the circuitry must be onboard to allow it to select the correct network, so when the manufacturer offers their boards in discrete bands rather than a "universally tunable" device, is it important to select the correct one for best performance. Another feature you could educate us about is the importance of using very short antenna leads, and selecting a quality antenna since those purchased from Amazon and the Chinese sites are often way out of tune. I found it to be very easy to build a 1/4 wave 915 MHz ground plane antenna with pretty good VSWR.
Thanks for the nice comment. Yes, I agree with 1/4 wave. It is easy to build, has great performance. It radiation pattern reaches all around. I have experienced incorrect antenna in this video kzread.info/dash/bejne/go6bqqhpgpTcm9o.html and its followup here kzread.info/dash/bejne/dIl2j82qaK-2Yqw.html. I have just explained to another respected visitor the purpose of this youtube channel. I am very sure I cannot mislead professionals & engineers by my videos. They are fully secure :) Strip Quote " If you look at my website, my tag line is "TECHNOLOGY FOR NON-ENGINEERS". If you check descriptions and tags etc you will find word "HAM" or "Amateur" frequently. I am not doing these videos to help professionals become more professional. KZread and Internet is already full of resources for that. I want to help anybody who wants to do it, just do it. What matters to me (fulfils my goal) is that it works. These antennas are not for sale. They are made with heart and love for oneself or friends."
Interesting video, I was suprised using two apps simultaneously with different setting. But one thing I am missing here: The modules with SX1262 typically have 2 different LCR component placements, one setup for LF (433MHz) and another for HF (868+915MHz). I guess there will be some losses, if using a frequency which was not intended by the actual component placement.
It is very interesting to find out if there are losses, YES must be. I have just posted a video which I hope you will enjoy. It will provide you with more info. Thanks & welcome for sharing your thoughts. kzread.info/dash/bejne/fZlmx5Kuqdmqipc.html
It's the antenna matching network that bothers me on some of these boards. The manufacturer's block diagram does account for an automatic antenna matching network, but the matching circuitry is external to the SOC, so are these devices equally equipped? The Heltec LoRa V3 is sold to operate on specific frequencies, and although the Meshtastic and other LoRa software allows band selection, the Heltec devices appear to use a simple matching network tuned for a specific frequency. It would be nice to know which boards have active multiband antenna matching.
This channel provides help to people who like to do experiments with radio, SDR, digital communication etc as a hobby. This is not targeted towards research and academic audience. Having said that, I appreciate your comment. Here is schematic of the device provided by Heltec resource.heltec.cn/download/WiFi_LoRa_32_V3/HTIT-WB32LA(F)_V3.1_Schematic_Diagram.pdf. In the LoRa section we can see the matching circuit which consists of c46, L7 and c47. Anyone can help the community by providing information about what values Heltec is using for different bands given in Meshtastic. Meanwhile I see no problem in switching between 868MHz and 915MHz. However there is some loss of power to/from 433MHz due to VSWR/mismatch which is still ok for experiments at low power.
@mbunds I tried further to address your question/comment and here is the video that can provide some more info into the subject. Thanks for sharing your thoughts kzread.info/dash/bejne/fZlmx5Kuqdmqipc.html
solid video
Thanks for supportive comment.
Thanks for sharing! Hoping to receive my first meshtastic devices in the mail next week 😊
I hope it would be a fantastic experience. Please feel free to ask if you have any question about it. Thanks for sharing your thoughts.
@@technologymasterkam Will do.👍 I can't wait to try them out. Hoping to use them for communications in remote wilderness areas.
Test a Lilygo T Beam.
Lilygo 2.4GHz is somewhere down the road. Eager to test SX1280 with PA. But I would like to test other TTGOs as well.
Thanks!
Welcome!
what SDR/Antenna did you use?
RTL-SDR USB dongle. Rubber duck antenna as Meshtastic test node was nearby. SDR Software is SDR Sharp latest version with all plugins. Full video is here kzread.info/dash/bejne/q6imltuQnJqdfqQ.htmlfeature=shared
sir can you expalin how intergrate wireless tracker with ultrasonic sensor and servo motor
You can use UART (4 wires) or 2 wire protocol like I2c for hardware integration between Heltec Wiresless tracker and Sensors, Mortors etc. If you want to add Arduino between the sensors and tracker, you can also do that by using/soldering headers provided with tracker. On the software side Meshtastic Serial Module can help providing simple communication interface.
the USB-C port provides 5V, the board runs at 3.2v, so there is power loss stepping it down cause it is used to charge a battery. To get true readings you must measure the power draw from a battery instead of the USB-C port since it is meant to be used that way. On repeater mode at power save mode i've gotten readings as low as 13mA on idle and 105mA when sending messages.
I have repeaters last 4days on a 2000mAh battery which would be impossible with the readinds you're getting from that test.
I want to thank you for sharing your thoughts. There is more than one to reach a conclusion. Which way I chose or someone else chose depends upon how accurate results we need and willingness to spend time and money on it. The tests I have performed are not research level tests going as basis for scientific thesis. They are go people doing it as a hobby. So charging reading was taken with charging on - charging off while keeping all other things almost the same. 2) As you have mentioned that you were using power save mode, these reading will not match reading shown in the video as I was not using power save but trying to emulate normal use. 3) I am really happy that you are experimenting with these devices and sharing the results. Meshtastic Discord group is very active community where you can ask/share your results in addition to comments here.
You can see its true power consumption more clearly when you're powering it through the lipo battery pack via the JST connector. When running the device through USB power, the device is running a voltage converter onboard, which gives off a bit of heat AKA wasted energy. I run Heltec V3's as repeaters, and they routinely get 4-5 days use out of 2000mah battery.
Yes, charging circuit and voltage regulator consumes power. I totally agree with you and other comments in this regard. However I did not wanted to take it into account for my purpose as this is negligible for general use. Electrical engineers, RF engineers and more serious users understand it. I appreciate highlighting the issue and posting comment.
I caught a hacker trying to scan all my free, unencrypted nodes. Apparently he didn't know that I now have his node#, name and password. Be careful, hackers 😂
ha ha ha
Couple of photos from my field test with Meshtastic Paxcounter created in this video. www.youtube.com/@technologymasterkam/community
isn't it more like 150mA ?
Yes, it is. This is youtube short and part of screen is missing. Here is the full video kzread.info/dash/bejne/ZqSMqqiMadjYcbQ.html showing full information. Thanks for asking.
Nice one
Thanks :)
You realize the output dbm is higher due to a lower bandwidth and lower speeds...lol
One would assume that a person reads all the specs and compares them to their requirements before buying.While it would have been better if this had been mentioned, it shouldn't be an issue unless someone just boneheadedly bought based on a random KZread video.
how to use Meshtastic device with Windows PC without internet?
There is no windows app. However you can use web client for chromium based browsers e.g Chrome to connect to your device via WiFi, Bluetooth or serial. client.meshtastic.org/ There is no need for Internet for this to work. There is a workaround as well. You can install some android emulator e.g bluestacks and install android app on it. This way you can use all app functions from a windows pc.
@@technologymasterkam thanks for your reply. how come there is no need for internet to use Meshtastic web client? are you sure about that? I tried it without internet and it didn't work. android emulator on PC sounds interesting. I'm not familiar with that.
1-Here is bluestacks website www.bluestacks.com/ It is a simple install. 2-For web client you need to load it via internet. Once loaded in browser, you no longer need Internet. You can sleep your laptop and take it far away in woods etc. It can connect to Meshtastic device via Bluetooth, http or via usb cable.
No matter what I do, Google understands LoRa as Laura :)
Turn off autocorrect and autocomplete! Learn to spell. Actually type the words with a keyboard rather than speaking them.
Thanks for the information!
Any time!
The LRPT signals (137.100mHz, 137.9125mHz) are Narrow Band FM signals with a right hand circular polarization. WXtoIMG V2.11.2beta is used to decode the signal into a visible image. While I haven't checked in a couple of months NOAA15 was transmitting on 137.620 but imaging systems had failed and it was being shut down since it wasn't responding. Control and support for the NOAA POES systems (NOAA19, NOAA18) have been handed over to a private company.
LRPT is entirely different from APT. This video is only for APT.
@@technologymasterkamMy apologies, I was under the impression that APT was the type of satellite and the LRPT/HRPT was the type of signal transmission. Would you consider a video on identifying the latest Meteor satellite signal in the 137mHz band? Many thanks, and have a great day!!
@@e.v.squatch5835 I will add it to my wishlist for making a video. Thanks for sharing your thoughts.
Thanks - I am going to get a Lora board and this is exactly the information I need to know because there are so many types available .
Glad it was helpful!
Good info! Thank you
Glad it was helpful!
That is helpful! Thanks for the heads up. If KZread is going to get this specific about recommendations...that's a little creepy though. I don't know how you randomly hit my KZread feed with only 500 views on such an obscure topic, but I might prefer they went back to advertising old women's incontinence products to me than have them watch every single thing I read, say, or do. 👀 They're watching lol
yeah is pretty spicy, but i get you tis been a bit since i last looked but yeah,
If you use the YT platform there is a list of topics following the click pattern... It's called an Algorithm "
Great work
Thanks
hello please I want some assistance with a signal I've been trying to identify and decode since a long time
You can try searching signal here www.sigidwiki.com/wiki/Signal_Identification_Guide. If you do not find it, you can post your signal here www.sigidwiki.com/wiki/Adding_a_Signal_Entry so that other people can try to identify it.
done@@technologymasterkam
Zoom option is there or not ... If yes how much
It does not have optical zoom. It only has digital zoom. Here is the live demo of zoom kzread.infoFQ8cIVclHNE?feature=shared