An Oscar documentary video. You thoroughly explained what each component is used for and how it operates. Please continue on with this format. Expand on the chopping board by adding on an amplifier or a receiver. Keep the series going.
We're about 60 years too late for me too build my first transmitter. But I thoroughly enjoyed this video. I wish I'd been able to see it 60 years ago. Kids these days are lucky.
Much better than the spark transmitter I built as a school kid. I was so pleased with the range of a half a mile that I told my teacher. He was a ham - the rest is history!
Your TX really produces a nice clean tone. Most simple DIY CW/Morse TXs builds I see online don't produce very nice tones. They're often very dirty, chirpy and noisy. Yours should really get through RF noise.
Thanks for this Peter, the very detailed talk through is great and this video makes a superb "first building block" for folk thinking about starting home brew projects.
This is one super excellent radio circuity explanation and building tutorial I haven't seen before! Please, do more these tutorials!! Do you have a similar content tutorial how to build a radio receiver?
Well I am amazed you did that with one transistor. I had started with amateur radio when still in school, got the certificate of proficiency. But I haven't touched any of my radio gear in over 30+ years, its in storage boxes.... The BD139 is famously used in many cheap diy rf circuits, but way back then it never even crossed my mind to use it as the oscillator....
Great stuff Peter and well explained. I'd opt for a 3.560 MHz crystal because it's a recognised QRP (low power) frequency and other QRPers are likely to listen on that frequency. I like QRP and QRP to QRP contacts are excellent. I have bought all the QRP frequency crystals and use 40m, 60m and 80m in my valve transmitters, and 160m in my transmitter similar to yours but using a BFY51. Need to build something for the higher frequencies now. G4GHB.
Thanks Bill. 3.560 MHz is good in the UK but not elsewhere. Eg it's in VK's SSB section as our band is narrower. USA is different again with their band being wider. Viewers should research local activity and licence conditions before deciding what crystal frequency to get. Online SDRs are helpful here.
@@vk3ye Ah, right, o.k. Peter. 3.560 seems popular in Europe as well, perhaps G QRP club members. Just as 7.030 frequency here but U.S.A. seem to use 7.040.
Hola Sergio LW2DQI. Por los años 90s hice uno parecido. Casi igual. Modulado en AM y llegue desde Berazategui hasta una ciudad en Uruguay ( San Carlos) a 400 kms de casa. Una gran satisfaccion me dio. Saludos.
@@gerardorios992 hola vecino. Soy quilmeño y tambien arme uno parecido en AM. Un tr oscilador a cristal y dos bd139 en paralelo a la salida =5 W out. Saludos. Lw2dqi.
Hace muchos años hice uno parecido con el BD139 y Xtal de TV 3.52 Mhz . 1 Watt Modulado en AM y llegue a 400Kms. De BsAs a una ciudad de Uruguay. por los años 90s.Muy linda esperiencia.
Hi Peter, I bought a dozen BD139s on your recommendation for this project. Now if I see 2N2222a in other simple transmitter designs, can I substitute the BD139s for the oscillator and the power amplifier? Thank you.
Short answer is it won't work and you'll need to completely redesign it with a different transistor. Long answer is it might oscillate on 9 MHz as 27 MHz crystals are normally 3rd overtone. Don't bother with this circuit. Instead look for a 27 MHz circuit and modify that. But your output power will be less so you may need an amplifier.
@@vk3ye ok. thanks for the response. I built and still have a working version of your 1.5-3 volt low power beacon that I added a 28mhz crystal to. Very cool stuff you share. Thank you.
Thanks for sharing us this. I watched your two videos about this transmitter. But what I don't understand is this: this transmitter can work in Amplitude Modulation(AM) or it also work in Frequency Modulation(FM) ?
Sir how to get the schematic of 433 mhz transmitter and receiver module's with explanationo i.e. how the data is transmitted from transmitter to receiver to control the servo motor , D.C. motor of any RC toys
Hello Peter, What a great project, I'm going to do this too! Could you also convert this transmitter for 40 meters? Maybe AM later?(Maybe with 2 or 3 BD transistors?) Healthy and Friendly greetings from the Netherlands! Rob
Hello again, I have one more question. How do you think, are the transistors in such simple projects more resistant to bad SWR compared to commercial radios ? I.e. If I use a 10 or 15 m or 25 m antenna instead of 20 m recommended for that project would that be a great risk of "annihilate" the transistor ? Of course I understand the different lenght of wire will lower the efficiency of the antenna.
You probably won't damage the transistor but if you do they're cheap and easily replaced anyway. Impedance matching is critical if you use different lengths of antenna and if it's poor it won't get out more than a few km (if that) especially with short antennas.
I' am a beginner with licence and collect parts for this project. My question is, how do you think what range of frequency will this circut "cover". I have a few crystals between 3 and 4 Mhz and wondering what if i put instead some 7, 10 Mhz crystals? I think I could also make a switch to select different cristals in order to change frequency. Do you think it is a qood idea or you maybe have some comments/hints ? Thanks Peter for another great video !
Hi Piotr, I would stick to one crystal first. When you get that to work you can put in a switch with another one or two crystals. But all crystals need to be roughly similar (eg within about 20% of each other) otherwise you will also need to build separate pi network filters and switch / plug them in. The oscillator circuit works at 7 MHz and should work at 10 MHz. You will need to change pi network values for frequencies higher than 4 MHz otherwise output will be very low.
And that is exactly why you should study for your amateur radio licence! You'll learn exactly why this is possible. Thousands of miles is achievable from a 9V PP3 battery with a transceiver that fits in your jeans pocket! The antenna could be a length of wire that fits in the other pocket!
Heh, putting winlink on the Color Burst CW frequency might have not been the smartest move. People have been building CW rigs for that freq since TV's have had color burst crystals. Or since the dawn of color television in USA.
WOW! What A Superinfo full video, i just LOVED IT! Can i have some personal contact with You? i have some questions for You mate, do You have a discord?
No discord. You're welcome to ask questions here or on my VK3YE Radio Books Facebook page. Alternatively Facebook and QRZ have subforums on homebrew that you can tap into much more knowledge than just me.
An Oscar documentary video. You thoroughly explained what each component is used for and how it operates. Please continue on with this format. Expand on the chopping board by adding on an amplifier or a receiver.
Keep the series going.
Yes, That Is Just CCRAZY, Noo ne Does It ! Its SUPER COOL THAT HE DOES, WIN For The Vk3YE
We're about 60 years too late for me too build my first transmitter. But I thoroughly enjoyed this video. I wish I'd been able to see it 60 years ago. Kids these days are lucky.
Much better than the spark transmitter I built as a school kid. I was so pleased with the range of a half a mile that I told my teacher. He was a ham - the rest is history!
Go bigger...much bigger
Now that's proper breadboarding
A Great Starter Circuit to make for the Newcomer .....fun to make and get on Air ......thanks Peter
The first transmitter I built was for topband, it was actually meant to be a receiver! Must be more than 60 years ago. 73 de CT7AOX ex G8CYE.
Your TX really produces a nice clean tone. Most simple DIY CW/Morse TXs builds I see online don't produce very nice tones. They're often very dirty, chirpy and noisy. Yours should really get through RF noise.
Impressively nice tone and long distance for such a build! I'm glad I got this in recommendations. Thanks!
Holy shit 500km?! I might have to build this for myself, and slowly upgrade it :)
Awesome video!
Thanks for this Peter, the very detailed talk through is great and this video makes a superb "first building block" for folk thinking about starting home brew projects.
Being able to be heard hundreds of miles away with so few parts and such little power is amazing when you consider it.
Bravo !
I really enjoyed this video Peter. I’m going to take time to build it and explore it. Thank you
This is one super excellent radio circuity explanation and building tutorial I haven't seen before!
Please, do more these tutorials!!
Do you have a similar content tutorial how to build a radio receiver?
Thanks. I'll have a radio receiver one in a day or two.
Well I am amazed you did that with one transistor. I had started with amateur radio when still in school, got the certificate of proficiency. But I haven't touched any of my radio gear in over 30+ years, its in storage boxes....
The BD139 is famously used in many cheap diy rf circuits, but way back then it never even crossed my mind to use it as the oscillator....
Interesting project! Thanks for the video!
Great stuff Peter and well explained.
I'd opt for a 3.560 MHz crystal because it's a recognised QRP (low power) frequency and other QRPers are likely to listen on that frequency.
I like QRP and QRP to QRP contacts are excellent.
I have bought all the QRP frequency crystals and use 40m, 60m and 80m in my valve transmitters, and 160m in my transmitter similar to yours but using a BFY51. Need to build something for the higher frequencies now.
G4GHB.
Thanks Bill. 3.560 MHz is good in the UK but not elsewhere. Eg it's in VK's SSB section as our band is narrower. USA is different again with their band being wider. Viewers should research local activity and licence conditions before deciding what crystal frequency to get. Online SDRs are helpful here.
@@vk3ye Ah, right, o.k. Peter. 3.560 seems popular in Europe as well, perhaps G QRP club members. Just as 7.030 frequency here but U.S.A. seem to use 7.040.
Great design . Greeting from Buenos Aires - Argentina - LW2DQI-
Hola Sergio LW2DQI. Por los años 90s hice uno parecido. Casi igual. Modulado en AM y llegue desde Berazategui hasta una ciudad en Uruguay ( San Carlos) a 400 kms de casa. Una gran satisfaccion me dio. Saludos.
@@gerardorios992 hola vecino. Soy quilmeño y tambien arme uno parecido en AM. Un tr oscilador a cristal y dos bd139 en paralelo a la salida =5 W out. Saludos. Lw2dqi.
Hace muchos años hice uno parecido con el BD139 y Xtal de TV 3.52 Mhz . 1 Watt Modulado en AM y llegue a 400Kms. De BsAs a una ciudad de Uruguay. por los años 90s.Muy linda esperiencia.
400 kms this is fantastic,
Another excellent video Peter thanks.
Owen
Another great video
Thanks
Nice stuff, as usual.
Well done Peter VK2DQ
So it's like an old fashioned crystal set on steroids
short wave bane it pic up at night times very well
Hi Peter.
I tried this circuit around 6 times but every time my transisto just blew up and nothing.
Take up knitting
I like the video !
Hi Peter, I bought a dozen BD139s on your recommendation for this project. Now if I see 2N2222a in other simple transmitter designs, can I substitute the BD139s for the oscillator and the power amplifier? Thank you.
Possibly. Especially for the power amplifier where the BD139 is rated more.
Can you do a follow up on this to demonstrate how you could increase the output to say 1W or 2.5W?
You'd need to add another transistor. My website with links to videos describing a 5 watt transitter is here: vk3ye.com/projects/projchirpy.htm
Nice project.
But you did not show where the audio or microphone will be connected,
please show where it should be connected.
Este circuito é para ser usado com chave para código Morse
2x 100ohm resistor in paralell
Why is it not the morse sound at 3700 hz. It is more like at 800 hz. What in the transmitter is making 800 hz sound????
what the easy way to build a circuits to make it oscillating onther ward is inverted to AC volts or an AC signial
Подскажите,Уважаемый-Ваш генератор выдаёт синус на выходе?Какой минимальной частоты кварц допустимо ставить-100кГц можно???
If I wanted to use a 28mhz crystal, would I just change the 220pf cap to a lower value, and change what other value?
Short answer is it won't work and you'll need to completely redesign it with a different transistor. Long answer is it might oscillate on 9 MHz as 27 MHz crystals are normally 3rd overtone. Don't bother with this circuit. Instead look for a 27 MHz circuit and modify that. But your output power will be less so you may need an amplifier.
@@vk3ye ok. thanks for the response. I built and still have a working version of your 1.5-3 volt low power beacon that I added a 28mhz crystal to. Very cool stuff you share. Thank you.
Thanks for sharing us this. I watched your two videos about this transmitter. But what I don't understand is this: this transmitter can work in Amplitude Modulation(AM) or it also work in Frequency Modulation(FM) ?
a short wave radio there is 11 25 49 60 90 75 120 13 and so on how do you build a circuits to revivified all of this banes
WOW
Hola quería consultar si tienes el libro qrp mínimo en español para comprarlo
Sir how to get the schematic of 433 mhz transmitter and receiver module's with explanationo i.e. how the data is transmitted from transmitter to receiver to control the servo motor , D.C. motor of any RC toys
Try a google search
can I make the transmitter with 11.059 mhz crystal??
Hello Peter,
What a great project, I'm going to do this too!
Could you also convert this transmitter for 40 meters?
Maybe AM later?(Maybe with 2 or 3 BD transistors?)
Healthy and Friendly greetings from the Netherlands!
Rob
Ik ben ook Nederlands
How you can use this idea in metal detector
Hello again, I have one more question. How do you think, are the transistors in such simple projects more resistant to bad SWR compared to commercial radios ? I.e. If I use a 10 or 15 m or 25 m antenna instead of 20 m recommended for that project would that be a great risk of "annihilate" the transistor ? Of course I understand the different lenght of wire will lower the efficiency of the antenna.
You probably won't damage the transistor but if you do they're cheap and easily replaced anyway. Impedance matching is critical if you use different lengths of antenna and if it's poor it won't get out more than a few km (if that) especially with short antennas.
Thanks Peter !
can i detect tahath tarnnsmiter signal with am reciver
Induction coil Victorian style simple
I' am a beginner with licence and collect parts for this project. My question is, how do you think what range of frequency will this circut "cover". I have a few crystals between 3 and 4 Mhz and wondering what if i put instead some 7, 10 Mhz crystals?
I think I could also make a switch to select different cristals in order to change frequency. Do you think it is a qood idea or you maybe have some comments/hints ?
Thanks Peter for another great video !
Hi Piotr, I would stick to one crystal first. When you get that to work you can put in a switch with another one or two crystals. But all crystals need to be roughly similar (eg within about 20% of each other) otherwise you will also need to build separate pi network filters and switch / plug them in.
The oscillator circuit works at 7 MHz and should work at 10 MHz. You will need to change pi network values for frequencies higher than 4 MHz otherwise output will be very low.
@@vk3ye Understood! If needed I would surely find in net how to calculate a proper filter. Thank you once again for your great job :)
i think is not 500km...it can go more like 9999km....
Can this transmitter send Voice ?
No this a cw only transmitter
Watch this space!
Maybe modulate signal via a carbon microphone from an old telephone over the contacts of the makeshift morse key?
Yes. You may be modulate in AM the supplay Vcc.
@@blitzroehre1807 I did this many years ago when I built a similar circuit to Peter's for 160 metres, good for local contacts.
Nice
What is the RF power of it ?
I can't understand how low RF POWER can cover 500km?
Thanks
And that is exactly why you should study for your amateur radio licence! You'll learn exactly why this is possible.
Thousands of miles is achievable from a 9V PP3 battery with a transceiver that fits in your jeans pocket!
The antenna could be a length of wire that fits in the other pocket!
It's 500mW. Watch the video to see it on an RF power meter. Milliwatts can go a long way if there is little noise at the receiving end.
@@vk3ye Yes , thanks very much .
FM or AM
What type of trannsmmiter is it
HF AM transistor crystal controlled transmitter for amateur radio.
@@vk3ye what can i use for detecting signal. Is there a circurit for recievr for thath transmitter
@@nejcjug7135 See my website and other videos on this channel for more on simple receivers.
today the don’t build any stero with short wave radios with its anymore
Porque essa bosta não é traduzida para nosso idioma??
too bad it falls on a winlink frequency
I would venture to say it was a CW freq first :)
Heh, putting winlink on the Color Burst CW frequency might have not been the smartest move.
People have been building CW rigs for that freq since TV's have had color burst crystals. Or since the dawn of color television in USA.
WOW! What A Superinfo full video, i just LOVED IT!
Can i have some personal contact with You? i have some questions for You mate, do You have a discord?
No discord. You're welcome to ask questions here or on my VK3YE Radio Books Facebook page. Alternatively Facebook and QRZ have subforums on homebrew that you can tap into much more knowledge than just me.