Ah man, this stuff is right up my alley. I can't wait to see the upcoming videos! I just completed building my second HF SSB transceiver from scratch about a month ago. That one was for the 80m band. It's an incredibly satisfying feeling the first time you transmit on the air with a radio you've built and hear someone respond to your call. Keep 'em coming!
Then maybe you can help me understand what the point of this project is? Why not use Bluetooth or WIFI? Is it just simplicity/prepper/DIY fun thing or what? Thx
Back in the 80's there was a radio show for computer nerds and we got simple computer programs via radio transmission. Back then it was mind blowing to be able to record a computer program to c-cassette from public radio show.
The old home micros invariably used FSK modulation - at remarkably low bitrates. 300 baud being common, both to keep costs down and because it was expected that users would want to hook up the nastiest, cheapest tape recorders their pocket money could buy, and so noise tolerance was important. That's one reason it took so long for games to load. Then to make it even worse they use stop bits which add a 12.5%, or sometimes even 25% overhead - in order to allow the use of a cheap, commodity UART rather than a more expensive HDLC interface. The format was designed primarily to keep the hardware cost as low as possible, which meant compromising on bitrate. People with 'real computers' laughed at them.
@@vylbird8014 1/100/1000 ETHERNET USES PAM5 TO GET THOSE SPEEDS OVER TWISTED PAIR. Ethernet devices are remarkable, auto negotion , auto tuning, just like PCIe Gen123.
@@jamesmorton7881 I don't know about 100 and 1000, but 10mbit uses Manchester encoding - simple binary modulation. That applies to both the coax and twisted pair forms.
@@vylbird8014 prevents a DC bias at RCVR, and ISI, bit to bit smearing 1000 or GBe four pair at 125MHZ times 5 signal levels the defacto bus for modern weapons like GLOBAL HAWK
Hi Son of the Main Presenter. Great Video, well you have a great mentor in your father, also you look so much like your father that I thought I was watching a really old video of your father.
Nice to meet you. Been looking into some of what you are presenting for a while now. Thank you for posting your insights. Look forward to what you have to share and watching you grow as a presenter. Doing great man ! 👌👍
I'm very excited to see more RF centered content. Definitely excited to see more on the hackRF, but sooo excited to see the HF transmitter and the 6W FM transmitter!!!
Thank you for your time and your efforts; I liked that you have shown both the fundamentals and the actual process of physically doing the thing. I am looking forward to your next videos; two thumbs up.
For the barrel connector, assuming the board is trustworthy, it has a little diagram showing the polarity of the center pin. It's visible at 9:53 Great vid. Look forward to more =)
Really like your guys work. One thing I would enjoy see presented is your take on radio remote control. You people seem to make things simple to understand. We have machines that we operate through hard wired tangled up cords and have no idea where to even begin to make them radio signal controlled.
Ohhh i been trying to find a way to transmit digital data by using my audio card and here its the answer! Many thanks for sharing your knowledge!! My project is a challenge about trying to use the lowest possible budget for a light band communication with the simplest possible hardware. So Im using high power LEDs collimated with fresnel lenses and photodiodes as Tx and Rx respectively. I tried using Easypal and it works but its quite limited in bandwidth (2.5kHz) and also on transmit time to 10 minutes. So this is just perfect. Keep the great work.
Two things, first I would like to say I believe I learned more about mathematical equations and science in the first ten minutes of this video than the 4 years spent in high school, great explanation. The second part of my comment has to do with negative comments, please pay no attention to them, it is their way of compensating for a small wiener and bank account to match. I would be willing to bet most leaving negative comments have never solderied a wire, its a new world, geeks rule and better than that they change the world for the better.
Very good point! I started watching the TI videos a few months ago and just assumed I had missed the one where he introduces himself. It's not surprising that RUclips presenters wish to have some level of anonymity (one look at the comments section of any video is enough to send a shudder down the spine ), but most channels manage to identify the presenter at some point.
Great job! Very clear presentation - and what a useful project, I can think of a million applications. I love that you guys are putting out more content.
Hi there, I really enjoyed your video, your presenting skills are very good just like dad, I guess you learnt from the best. You are so lucky to have such an awesome dad and if you ever want a much older brother I am open to adoption! Seriously though thank you for posting this, it was a great presentation.
I will do the Hack RF video. It will use much less bandwidth because I would modulate the QAM directly and not through FM. I really don't know how fast it will be though. There are too many variables that come into play like the speed of the software and the sample rate of the Hack RF.
Came across this channel awhile ago and stumble across some information that really help me in general.... but the really nice thing is that the channel keeps popping up spot on with some stuff that i need in the moment or in the near future :D really makes my nerd face pop out of the nothing and i start to do some stuff that was left more or less on the back :)) and by the way its not so hard to make VCO.. probably implementing it loud be the interesting part
There is a mystery surrounding your names. Maybe you prefer to be addressed as: Mr. Presenter and Mr. Son of the Presenter. Son of the Presenter, I'm looking forward to watching your videos. I'm sure they'll be very interesting. You two must have a blast in your lab! I'd like to see a blooper reel, things going crazy, blowing up! I'm sure we'd all love to see that! You guy's have a hell of a great thing going, keep it up! We'll be watching!
Trenton Alverez lol, I'm going to give you the benefit of the doubt and assume English is your second language. Yes, I meant wandered. The sentence "I wondered if her mind was wandering." is completely proper. When you wonder, you are inquisitive about something specific. When your mind wanders, it's allowed to meander without aim and tends to settle in a place that satisfies the mediocrity principle. ;)
I remember that in the 70's and 80's and perhaps beyond, Panasonic equipment used that reversed "standard" on most of their portable gear. Since Panasonic gear was so popular, you quickly learned to check that before hooking up a power adapter! :) The best way to do that if you can afford the approx. 1 volt drop on the input is to put a bridge rectifier between the power jack and the device when you're building it. If you follow the current path on a bridge, it always stays the same polarity at the output regardless of the input polarity at the expense of 2 diode voltage drops of .5V or so each.
I work as an engineer for a company that manufactures a 24VDC motor control and we have used Meanwell supplies in the past and, still do on some occasions. We found that fan control was an issue on the 600 Watt units; once a load was removed, the fan continued to operate which caused a noticeable noise in an office environment. We made the switch to another manufacturer who agreed to make a circuit change, on all future revisions, based on our request. Feel free to ask for more info.
thanks, Paul , for this demonstration and very informative experiment. Ive been thinking about stuff like this recently. mostly for communications within a 200-300 acre area. being low power I dont think the fcc will mind. lol Cant wait to see your next projects. Keep up the good work guys!
I think the dipole should be shorter by a factor of about 0.8. That's because speed of electromagnetic wave in copper (which the dipole is made of) is smaller than in a vacuum. In your calculations You took the speed of EM wave in a vacuum. Also soldering in high frequency situations causes significant loses due to skin effect (solder is less conductive than copper).
The wave is not traveling in copper. It is traveling in the dielectric space between the conductors. It is pretty much always the dielectric that sets the speed of propagation. For a dipole, the wave is traveling in air, which is basically the same as free space.
@@mckenziekeith7434 your opinion is very interesting; in literature about antennas I have seen many times information that particular antenna should have some dimensions when it is made of copper, and a little bit diffrent size when it is made of aluminum. There were always a shortening factor at play, dependant on antenna's material, not the dielectric space around. The dipole was no exception. And the SWR was pretty good for this antennas - so shortened by this factor they were able to radiate out EM energy properly, thus impedance matching between antenna and dielectric space around it seems to be OK. Thanks for your opinion - for me it is an invitation to dig deeper in this topic!
@@krzysztofsoja5301 I believe you that the shortened antennas work better. I have even read that in some ARRL manual or something. But the explanation is not to do with propagation delay in copper. Technically, an EM wave cannot travel in a block of copper. In general, the propagation speed is determined by the permittivity and permeability (epsilon and mu). Typically, for dielectric materials, mu is same as free space, so epsilon controls propagation speed. For example in coax, the propagation speed is entirely set by the dielectric constant of the insulator between center and shield. The dielectric typically also becomes the greatest source of loss at higher frequencies. So very high frequency cable may use a very low density material for the dielectric. Twin-lead or ladder line can be designed with almost no dielectric webbing, and so it is possible to make ladder line with a propagation speed approaching the speed of light. Such ladder line will also have low loss at higher frequencies for the same reason.
@@mckenziekeith7434 Wow, now You really have my attention, Sir. Again I feel and see how small and inadequate is my knowledge. I really, really need to dig way, way deeper in this subject. Help me unerstand, please- why shortening factor (for antennas) is different for different materials? How to explain that dependancy? If - as You say - EM wave is not capable to propagate in a block of copper (conductive material in general) how then are physical dimensions of antenna's emiter/refractors crucilal for proper emiting HF energy as a EM wave? Basically how does antenna work - in your approach? Seems like my understanding of that is waaay insufficient. BTW thank You for spending your time to answer my comments 😉
@@krzysztofsoja5301, honestly, I don't know why aluminum and copper would be different, assuming they are the same diameter. In fact, I don't even believe they would be different. As you know, the main dimension of importance is the length of the branches of the dipole. But the diameter of the conductors does matter a little bit. All of this stuff can be derived from Maxwell's equations. Antennas are designed to set up a propagating electromagnetic wave. The wave has both electric and magnetic components. Complex antennas are designed using finite element analysis and software that can work out Maxwell's equations in the finite element mesh. Simple antennas are designed using guidelines from people who have made them in the past. The 0.8 factor used for the dipole antenna is probably due to some kind of fringing effects at the end of the antenna, where the assumptions break down.
I really admire what this family has. Pretty cool nest of nerds (i mean that in the best way possible). Lol, my niece who works at NASA, called me a "nerd" the other day when i told her i was reading about focusing magnetic flux using Halbach arrays (for use in a lightweight UAV alternator). I received it as a high complement.
We do this with more power and MUCH bigger antennas, with HF (shortwave) ham radios. It basically allows world-wide communications that do not depend on any man made infrastructure. Usually data rates are relatively slow due to limited signal bandwidth as allowed in our licenses. It works very well, although I do prefer the classic digital mode called - Morse Code. No computer is required t decode, except the gray matter between operator's ears.
I'm a 2E0, and wanted to get into ham data networking too - but I've found very little interest in it. I think there was a big surge of interest in that around the 80s and 90s with packet radio - a wonderful new super-technology at the time - but then the internet and mobile phones came along, and pretty much killed all interest in it. Rather than continue to advance into higher speed and more sophisticated protocols, packet was just left neglected until it faded into obsolescence.
Here’s some ideas that may help someone. I’ve used a RTL SDR dongle with HDSDR as a cheap spectrum analyzer to tune transmitters. It’s not dead on, but it gets you close. Also works well to verify narrow banding by verifying the BW from center frequency.
Good thought. I have one of those, but I forgot to mention it in the video because I just default to the spectrum analyzer. This is a very good low cost way to do this.
Main Presenter actually made a time travel device out of foam board and transducers, then went back and shot this video and brought it back to us today. Wake up people!
Do not hide your light under a basket. POF Plastic Optical Fiber is a low cost media for data transmission using LED emitters and detectors. (AVAGO) No special tools for terminating at the PCB. Maximum data rates, about 1MB/sec. So, maybe a laser diode / pin detector will work using POF for very high data rates. Thanks for your calm clear presentations.
I’m curious why you don’t use some of the nrf24 modules that can push up to 1Mbps using an SPI interface, and are available very cheaply, including units with amplifiers that can transmit at up to +30dbM (Legal limit). I’ve tried them and they are quite simple to use and have freely available Arduino libraries for handling the setup and data packetizing. The range is very impressive and includes a multitude of channels, built-in retransmitting and error handling, and other sophisticated features. Plus they don’t involve the legally-questionable use of FM transmitters :)
6:58 Small tip for straightening wires: simply twist them along their length using an electric drill. Just a few turns and then pull it through your fingers. It's used for straightening solid core wires, but works on stranded wire as well.
Can you please, please ask the main presenter to upload the video in which he test's his ACTIVE NOISE CANCELLATIONS contraption with a real engine. Or at least does more experiments with it? I am really looking forward to that! And thanks!
Nice Video Jr! I don’t know if already know but at 10:00 there is a sign left to the power connector that shows the polarity. That’s on basically every device that uses this connector.
Thanks. Actually, I have found it missing on a significant number of connectors. This tends to be when the power supply is part of a packaged product as opposed to a stand alone unit.
@@TechIngredients Absolutely, never believe the screen print! BTW the reason the outside ring is sometimes positive is because it it the side that is switched in the socket, and for the unimaginative designer, is an easy way break the battery line.
I would love to see a full detailed video on how to build the vco transmitter that you briefly mentioned: part POS-150+ VOLTAGE CONT OSC / RoHS That you listen in the description. Hopefully tunable without special equipment.
I'll think about making a video on that. It's very simple. You just need the VCO, a 10K pot, an audio coupling capacitor, and an audio cable. Apply 12V to the VCO's VCC pin and the pot. Connect the pot to the V-TUNE pin. Solder a short wire or the dipole I described to the RF OUT pin. Strip the audio cable and connect to one end of the capacitor; connect the other end to the V-TUNE pin also. Turn the pot and the frequency will change. Another commenter mentioned an RTLSDR. It is a cheap spectrum analyzer and will work fine for this. You'll see the peak on your comp. I use SDR sharp with mine. The hardest part is installing the drivers. Everything else is easy.
Look at the Ti CC1101. It does everything you ask for plus more advanced gfsk and many more. You can use their little tool to build a register set for a range of latency/throughput/range/noise immunity. While SPI modules with an antenna for any of the legal ISM bands are available for about 5 bucks. I'm pretty sure if you knew about them this video would be on them and not hacking this together. (PS. no insult intended, it is a great vid and you are nearly as good as your dad)
I've looked at a bunch of these chips. They are not QAM and not for the VHF band though. I'm interested in using VHF low and HF frequencies. For these frequencies, there really isn't anything better I can find than what I show in the video. I'd really like an IC for this type of thing.
Fair enough, you could use it on the 315MHz ISM band but I guess that is just outside of the formal VHF band. The range at that frequency would be amazing.
Hi son of main presenter :) you seem to know something about RF, i would love (if i could be so bold) to see a video explaining the basics on how to excite the EM spectrum by using simple discrete components (i.e not a ready made bought circuit or component) and modulate it such that you could receive it somehow (maby using a sdr) to receive a signal and of course explain how. Much respects and love from the northern hemisphere.
Those chinese modules actually can be programmed to do QPSK, which happens to be a QAM with four symbols (binary values of both I and Q), up to symbol rate of 500ks, if I remember correctly. Check the datasheet for the chips (Si4463)
👍🏻 any chance of starting lower? Like the construction of a high quality and highly correct, Crystal Radio and explain exactly how and why RF fundamentals exist and how they interact with the properties and dynamics of the Crystal Radio? I like the most correct details of science, like how Tesla used all the different sorts of electricity he modified to suit his requirements and the requirements of his working environment. Or the 432Hz Vs 440Hz debate. -Largely negligible to us for the most part, but for uncovering natures best kept secrets in its darkest corners, (or just the absolute highest possible efficiency, correctness and precession is key.
Hi, son of the main presenter! ✌🏻
After this sentence I immediately look at the comments :)
Ditto! :-)
Didn't even have to bother saying it.
He's so OBVIOUSLY his son.
he could have made a fake name and it would have made him come across less nervous.
I shall call him junior
I'm glad I stumbled across this channel. Love your cold matter-of-fact presentations on whatever you're working on
Ah man, this stuff is right up my alley. I can't wait to see the upcoming videos! I just completed building my second HF SSB transceiver from scratch about a month ago. That one was for the 80m band. It's an incredibly satisfying feeling the first time you transmit on the air with a radio you've built and hear someone respond to your call. Keep 'em coming!
Then maybe you can help me understand what the point of this project is? Why not use Bluetooth or WIFI? Is it just simplicity/prepper/DIY fun thing or what? Thx
Back in the 80's there was a radio show for computer nerds and we got simple computer programs via radio transmission.
Back then it was mind blowing to be able to record a computer program to c-cassette from public radio show.
The old home micros invariably used FSK modulation - at remarkably low bitrates. 300 baud being common, both to keep costs down and because it was expected that users would want to hook up the nastiest, cheapest tape recorders their pocket money could buy, and so noise tolerance was important. That's one reason it took so long for games to load. Then to make it even worse they use stop bits which add a 12.5%, or sometimes even 25% overhead - in order to allow the use of a cheap, commodity UART rather than a more expensive HDLC interface.
The format was designed primarily to keep the hardware cost as low as possible, which meant compromising on bitrate. People with 'real computers' laughed at them.
@@vylbird8014 1/100/1000 ETHERNET USES PAM5 TO GET THOSE SPEEDS OVER TWISTED PAIR.
Ethernet devices are remarkable, auto negotion , auto tuning, just like PCIe Gen123.
@@jamesmorton7881 I don't know about 100 and 1000, but 10mbit uses Manchester encoding - simple binary modulation. That applies to both the coax and twisted pair forms.
@@vylbird8014 prevents a DC bias at RCVR, and ISI, bit to bit smearing
1000 or GBe four pair at 125MHZ times 5 signal levels
the defacto bus for modern weapons like GLOBAL HAWK
Hi Son of the Main Presenter. Great Video, well you have a great mentor in your father, also you look so much like your father that I thought I was watching a really old video of your father.
Beautiful to see father and son nerding out together!! Wish I had a father like that
I wish I had a son like that ;)
Yes, please adopt me!
Nice to meet you. Been looking into some of what you are presenting for a while now. Thank you for posting your insights. Look forward to what you have to share and watching you grow as a presenter. Doing great man ! 👌👍
I'm very excited to see more RF centered content. Definitely excited to see more on the hackRF, but sooo excited to see the HF transmitter and the 6W FM transmitter!!!
Thank you for your time and your efforts; I liked that you have shown both the fundamentals and the actual process of physically doing the thing.
I am looking forward to your next videos; two thumbs up.
Hi I'm the son of the main subscriber.
ROFL 😂
this had me laughing out loud for real
For the barrel connector, assuming the board is trustworthy, it has a little diagram showing the polarity of the center pin. It's visible at 9:53
Great vid. Look forward to more =)
Really like your guys work. One thing I would enjoy see presented is your take on radio remote control. You people seem to make things simple to understand. We have machines that we operate through hard wired tangled up cords and have no idea where to even begin to make them radio signal controlled.
Hello Tech Ingredients Jr.
I keep coming back to this, I hope your still going forward with this subject matter in time.
Ohhh i been trying to find a way to transmit digital data by using my audio card and here its the answer! Many thanks for sharing your knowledge!! My project is a challenge about trying to use the lowest possible budget for a light band communication with the simplest possible hardware. So Im using high power LEDs collimated with fresnel lenses and photodiodes as Tx and Rx respectively. I tried using Easypal and it works but its quite limited in bandwidth (2.5kHz) and also on transmit time to 10 minutes. So this is just perfect. Keep the great work.
ohh QAM, I was always amazed on how much information you can compress with it, like in good old color analog TV
Two things, first I would like to say I believe I learned more about mathematical equations and science in the first ten minutes of this video than the 4 years spent in high school, great explanation. The second part of my comment has to do with negative comments, please pay no attention to them, it is their way of compensating for a small wiener and bank account to match. I would be willing to bet most leaving negative comments have never solderied a wire, its a new world, geeks rule and better than that they change the world for the better.
I just realized I don't know the main presenters name.
Hay-zeus, Son of the Creator
Clearly his name is Tech Ingredients Sr.
no one does
Very good point! I started watching the TI videos a few months ago and just assumed I had missed the one where he introduces himself. It's not surprising that RUclips presenters wish to have some level of anonymity (one look at the comments section of any video is enough to send a shudder down the spine ), but most channels manage to identify the presenter at some point.
@@Muonium1 Not even his son apparently ;-)
In the 80's I worked part time for a really smart bloke who pioneered fax via HF radio here in Australia.
Golly, you are SO MUCH your Father's son, and I mean this in a complimentary spirit, God bless you.
As a ham radio operator I'm excited to see what comes out of this series.
-David
Strong family resemblance!
If the quality of content runs in the family I will be a subscriber and sharer. Well done.
Great job! Very clear presentation - and what a useful project, I can think of a million applications. I love that you guys are putting out more content.
I really like the idea of this series. Keys right into some of the projects I have on the back burner.
This was very well done, and very interesting. I look forward to range tests
Hello, I enjoyed your video. I really liked that you used a fm transmitter and receiver.
More content from this channel is always a good thing. Looking forward to those videos.
Thank you for helping demystify this tech! Radio transmission has always been a mystery to me.
Pretty cool. Glad to see the HackRF. Kept thinking use it, but of course there's the cost. Looking forward to the new radio videos.
HackRF is unbeatable for the price...
@@AKAtheA But you know you want an Ettus X310...
Hi there, I really enjoyed your video, your presenting skills are very good just like dad, I guess you learnt from the best.
You are so lucky to have such an awesome dad and if you ever want a much older brother I am open to adoption!
Seriously though thank you for posting this, it was a great presentation.
Great video! Glad you are going to join in to start sharing knowledge with your dad!
Well I didn't know that something like this is possible but I would say it's amazing.
Keep it up and waiting for more. 🙂
Words cannot describe how amazing this channel is, keep up the good work son of the main presenter :D.
Ah, it's because of Tech Ingredients that you caused the Resonance Cascade! I knew it!
Very cool! Thanks for sharing and I look forward to more radio videos. YES on the hackRF, I have one and always love when people use them in projects!
I will do the Hack RF video. It will use much less bandwidth because I would modulate the QAM directly and not through FM. I really don't know how fast it will be though. There are too many variables that come into play like the speed of the software and the sample rate of the Hack RF.
Came across this channel awhile ago and stumble across some information that really help me in general.... but the really nice thing is that the channel keeps popping up spot on with some stuff that i need in the moment or in the near future :D really makes my nerd face pop out of the nothing and i start to do some stuff that was left more or less on the back :))
and by the way its not so hard to make VCO.. probably implementing it loud be the interesting part
There is a mystery surrounding your names. Maybe you prefer to be addressed as: Mr. Presenter and Mr. Son of the Presenter.
Son of the Presenter, I'm looking forward to watching your videos. I'm sure they'll be very interesting.
You two must have a blast in your lab!
I'd like to see a blooper reel, things going crazy, blowing up! I'm sure we'd all love to see that!
You guy's have a hell of a great thing going, keep it up! We'll be watching!
Excellent. A whole new dimension to this channel. Electronics and the EM band. . . . By the way, he looks kinda familiar. 😎
Awesome! Looking forward for the rest of the radio series
Did dad ever experiment on you? Are you being held against your will? I'll turn my receiver on, send me a sign if you need help.
lol..your mean!
What strange places your mind wanders to.
Trenton Alverez lol, I'm going to give you the benefit of the doubt and assume English is your second language. Yes, I meant wandered. The sentence "I wondered if her mind was wandering." is completely proper. When you wonder, you are inquisitive about something specific. When your mind wanders, it's allowed to meander without aim and tends to settle in a place that satisfies the mediocrity principle. ;)
Hahaha, this is funny.
@Trenton Alverez ..lol nice reply 👍
Every factory made device which has the barrel jack "wrong way" , deserves to blow up. Except retro gaming devices, there was no standard 30yr ago? :D
My friend got an `94 Pontiac and that particular car radio used only uneven numbers so you could listen only one radio station here in Finland... ::D
Wolde Munster my radio also only receives a Finnish radio station, but I’m not in Finland....
The ones that are reversed are meant for battery charging AFAIK.
I remember that in the 70's and 80's and perhaps beyond, Panasonic equipment used that reversed "standard" on most of their portable gear. Since Panasonic gear was so popular, you quickly learned to check that before hooking up a power adapter! :)
The best way to do that if you can afford the approx. 1 volt drop on the input is to put a bridge rectifier between the power jack and the device when you're building it. If you follow the current path on a bridge, it always stays the same polarity at the output regardless of the input polarity at the expense of 2 diode voltage drops of .5V or so each.
Great. Looking forward to the HackRF QAM transmitter and the shortwave PA.
Thanks...you are just as clear and precise in your presentation as your dad.
I work as an engineer for a company that manufactures a 24VDC motor control and we have used Meanwell supplies in the past and, still do on some occasions. We found that fan control was an issue on the 600 Watt units; once a load was removed, the fan continued to operate which caused a noticeable noise in an office environment. We made the switch to another manufacturer who agreed to make a circuit change, on all future revisions, based on our request. Feel free to ask for more info.
Thanks for the presentation, Paul! I learned a lot. You're a natural!
Thank you.
Enabled notifications due to the announcement of "tutorials" :)
Anything specific you're interested in?
@@TechIngredients details my boy! Details!
Sma? BNC? The low part count thingy..
thanks, Paul , for this demonstration and very informative experiment. Ive been thinking about stuff like this recently. mostly for communications within a 200-300 acre area. being low power I dont think the fcc will mind. lol
Cant wait to see your next projects. Keep up the good work guys!
I think the dipole should be shorter by a factor of about 0.8. That's because speed of electromagnetic wave in copper (which the dipole is made of) is smaller than in a vacuum. In your calculations You took the speed of EM wave in a vacuum.
Also soldering in high frequency situations causes significant loses due to skin effect (solder is less conductive than copper).
The wave is not traveling in copper. It is traveling in the dielectric space between the conductors. It is pretty much always the dielectric that sets the speed of propagation. For a dipole, the wave is traveling in air, which is basically the same as free space.
@@mckenziekeith7434 your opinion is very interesting; in literature about antennas I have seen many times information that particular antenna should have some dimensions when it is made of copper, and a little bit diffrent size when it is made of aluminum. There were always a shortening factor at play, dependant on antenna's material, not the dielectric space around. The dipole was no exception. And the SWR was pretty good for this antennas - so shortened by this factor they were able to radiate out EM energy properly, thus impedance matching between antenna and dielectric space around it seems to be OK. Thanks for your opinion - for me it is an invitation to dig deeper in this topic!
@@krzysztofsoja5301 I believe you that the shortened antennas work better. I have even read that in some ARRL manual or something. But the explanation is not to do with propagation delay in copper. Technically, an EM wave cannot travel in a block of copper. In general, the propagation speed is determined by the permittivity and permeability (epsilon and mu). Typically, for dielectric materials, mu is same as free space, so epsilon controls propagation speed. For example in coax, the propagation speed is entirely set by the dielectric constant of the insulator between center and shield. The dielectric typically also becomes the greatest source of loss at higher frequencies. So very high frequency cable may use a very low density material for the dielectric. Twin-lead or ladder line can be designed with almost no dielectric webbing, and so it is possible to make ladder line with a propagation speed approaching the speed of light. Such ladder line will also have low loss at higher frequencies for the same reason.
@@mckenziekeith7434 Wow, now You really have my attention, Sir. Again I feel and see how small and inadequate is my knowledge. I really, really need to dig way, way deeper in this subject.
Help me unerstand, please- why shortening factor (for antennas) is different for different materials? How to explain that dependancy?
If - as You say - EM wave is not capable to propagate in a block of copper (conductive material in general) how then are physical dimensions of antenna's emiter/refractors crucilal for proper emiting HF energy as a EM wave? Basically how does antenna work - in your approach? Seems like my understanding of that is waaay insufficient.
BTW thank You for spending your time to answer my comments 😉
@@krzysztofsoja5301, honestly, I don't know why aluminum and copper would be different, assuming they are the same diameter. In fact, I don't even believe they would be different. As you know, the main dimension of importance is the length of the branches of the dipole. But the diameter of the conductors does matter a little bit. All of this stuff can be derived from Maxwell's equations. Antennas are designed to set up a propagating electromagnetic wave. The wave has both electric and magnetic components. Complex antennas are designed using finite element analysis and software that can work out Maxwell's equations in the finite element mesh. Simple antennas are designed using guidelines from people who have made them in the past. The 0.8 factor used for the dipole antenna is probably due to some kind of fringing effects at the end of the antenna, where the assumptions break down.
Like father like son, great video!
Good start presenting on the channel. Hope to see more of your content too.
Thats intresting too.
Electronics and transmitig is needing.👍👍👍
Good video.
Fantastic vid. looking forward to the series!
Thanks!
the apple doesn't fall far from the tree :) great video 👍
I really admire what this family has. Pretty cool nest of nerds (i mean that in the best way possible).
Lol, my niece who works at NASA, called me a "nerd" the other day when i told her i was reading about focusing magnetic flux using Halbach arrays (for use in a lightweight UAV alternator). I received it as a high complement.
Thank you for making and posting this wonderful video !
This is freekin awesome! Man! You guys are brilliant. Thanks for letting us hang with you even tho we are not worthy, lol!
Following the common human naming scheme, you must be Mr Techson ?
I'd like to thank you for a very interesting video.
We do this with more power and MUCH bigger antennas, with HF (shortwave) ham radios. It basically allows world-wide communications that do not depend on any man made infrastructure. Usually data rates are relatively slow due to limited signal bandwidth as allowed in our licenses. It works very well, although I do prefer the classic digital mode called - Morse Code. No computer is required t decode, except the gray matter between operator's ears.
I'm a 2E0, and wanted to get into ham data networking too - but I've found very little interest in it. I think there was a big surge of interest in that around the 80s and 90s with packet radio - a wonderful new super-technology at the time - but then the internet and mobile phones came along, and pretty much killed all interest in it. Rather than continue to advance into higher speed and more sophisticated protocols, packet was just left neglected until it faded into obsolescence.
This is very cool!!! I am looking forward to your future projects. Regards
I'd love to see some sat-com exp'eriments, I've had a lot of fun playing with it.
s-band shenanigans is fun
Here’s some ideas that may help someone. I’ve used a RTL SDR dongle with HDSDR as a cheap spectrum analyzer to tune transmitters. It’s not dead on, but it gets you close. Also works well to verify narrow banding by verifying the BW from center frequency.
Good thought. I have one of those, but I forgot to mention it in the video because I just default to the spectrum analyzer. This is a very good low cost way to do this.
Very cool and interesting, can't wait to see more of your content.
love to see some electronics here, ill be waiting for the next one !
I don't know much about radio, but I'm very curious to learn!
Like father like son, and i'm not explicitly talking about the hair, hehe.. this i great, learned alot. Thanks man.
For this first video I do think you did damn well
Really interesting will definitely watch the other videos in the future!
Can't wait for the next installment!
Great Stuff as always! Love the level of detail
I really enjoyed this one. Thank you for all the information.
Great work mate, please keep the tech video`s coming, Awesome content on this channel
Main Presenter actually made a time travel device out of foam board and transducers, then went back and shot this video and brought it back to us today. Wake up people!
this is going to be a 5M channel guaranteed
Do not hide your light under a basket.
POF Plastic Optical Fiber is a low cost media for data transmission using LED emitters and detectors. (AVAGO)
No special tools for terminating at the PCB.
Maximum data rates, about 1MB/sec.
So, maybe a laser diode / pin detector will work using POF for very high data rates.
Thanks for your calm clear presentations.
I’m curious why you don’t use some of the nrf24 modules that can push up to 1Mbps using an SPI interface, and are available very cheaply, including units with amplifiers that can transmit at up to +30dbM (Legal limit). I’ve tried them and they are quite simple to use and have freely available Arduino libraries for handling the setup and data packetizing. The range is very impressive and includes a multitude of channels, built-in retransmitting and error handling, and other sophisticated features. Plus they don’t involve the legally-questionable use of FM transmitters :)
Thanks for recommending a commercial product, I'll have to take a look at those!
6:58 Small tip for straightening wires: simply twist them along their length using an electric drill. Just a few turns and then pull it through your fingers. It's used for straightening solid core wires, but works on stranded wire as well.
Can you please, please ask the main presenter to upload the video in which he test's his ACTIVE NOISE CANCELLATIONS contraption with a real engine. Or at least does more experiments with it? I am really looking forward to that! And thanks!
Well done soon to be main presenter
Cool as usual. No worries TI Jr. ....... The HackRF projects should be quite interesting.
Nice Video Jr! I don’t know if already know but at 10:00 there is a sign left to the power connector that shows the polarity. That’s on basically every device that uses this connector.
Thanks.
Actually, I have found it missing on a significant number of connectors. This tends to be when the power supply is part of a packaged product as opposed to a stand alone unit.
@@TechIngredients Absolutely, never believe the screen print! BTW the reason the outside ring is sometimes positive is because it it the side that is switched in the socket, and for the unimaginative designer, is an easy way break the battery line.
Fantastic. Wish you all the very best !!!
I would love to see a full detailed video on how to build the vco transmitter that you briefly mentioned: part POS-150+
VOLTAGE CONT OSC / RoHS
That you listen in the description. Hopefully tunable without special equipment.
I'll think about making a video on that. It's very simple. You just need the VCO, a 10K pot, an audio coupling capacitor, and an audio cable. Apply 12V to the VCO's VCC pin and the pot. Connect the pot to the V-TUNE pin. Solder a short wire or the dipole I described to the RF OUT pin. Strip the audio cable and connect to one end of the capacitor; connect the other end to the V-TUNE pin also. Turn the pot and the frequency will change. Another commenter mentioned an RTLSDR. It is a cheap spectrum analyzer and will work fine for this. You'll see the peak on your comp. I use SDR sharp with mine. The hardest part is installing the drivers. Everything else is easy.
Well presented mate👍
You need better lighting on your overhead camera, and it shouldn’t be upside down, it should be in the same orientation you’re looking at it.
This is an interesting topic. Thanks for the great material!
Great video , would like to see more
Great video, very well explained! Thx
First AvE and right afterwards Tech Ingredients. Is it christmas all ready?
No, if it was Christmas, AvE would've been drunken poetry.
AvE’s son isn’t quite ready to give a presentation yet...
We are reading from the same sheet of music.
Great first video! Keep it up.
Yes! I have some data I need to transmit and was looking into this.
Look at the Ti CC1101. It does everything you ask for plus more advanced gfsk and many more. You can use their little tool to build a register set for a range of latency/throughput/range/noise immunity. While SPI modules with an antenna for any of the legal ISM bands are available for about 5 bucks. I'm pretty sure if you knew about them this video would be on them and not hacking this together. (PS. no insult intended, it is a great vid and you are nearly as good as your dad)
I've looked at a bunch of these chips. They are not QAM and not for the VHF band though. I'm interested in using VHF low and HF frequencies. For these frequencies, there really isn't anything better I can find than what I show in the video. I'd really like an IC for this type of thing.
Fair enough, you could use it on the 315MHz ISM band but I guess that is just outside of the formal VHF band. The range at that frequency would be amazing.
Great job. Very interesting topic and well presented.
Hi son of main presenter :) you seem to know something about RF, i would love (if i could be so bold) to see a video explaining the basics on how to excite the EM spectrum by using simple discrete components (i.e not a ready made bought circuit or component) and modulate it such that you could receive it somehow (maby using a sdr) to receive a signal and of course explain how. Much respects and love from the northern hemisphere.
Just out of curiosity, are you a ham radio operator? I'm really digging this series, I hope you keep 'em coming. 👍
WOW! Super excited for these vids! Love radio hacking.
thanks son of the presenter...looking forward to you next vidjeos :)
Those chinese modules actually can be programmed to do QPSK, which happens to be a QAM with four symbols (binary values of both I and Q), up to symbol rate of 500ks, if I remember correctly. Check the datasheet for the chips (Si4463)
This is great, I think you should do more stuff with SDR maybe grab an image from a weather satellite
Great video. Beginning to wonder if you're in the witness relocation program or something.
Thanks!
Our handlers warned us about that.
Thank you! Great job. Great video.
Awesome stuff!
👍🏻 any chance of starting lower? Like the construction of a high quality and highly correct, Crystal Radio and explain exactly how and why RF fundamentals exist and how they interact with the properties and dynamics of the Crystal Radio?
I like the most correct details of science, like how Tesla used all the different sorts of electricity he modified to suit his requirements and the requirements of his working environment. Or the 432Hz Vs 440Hz debate. -Largely negligible to us for the most part, but for uncovering natures best kept secrets in its darkest corners, (or just the absolute highest possible efficiency, correctness and precession is key.