Excellent job Ciprian! Thank you for keeping up with this project. You have inspired me to try my hand at building it, Im actually ordering the materials in bits and pieces now! I saw another schematic of the TMT on another ham's website where he put a 6V wheat grain bulb in series between the capacitor and the antenna output. This I think would help give the operator a good visual indication, i.e., tune for maximum brightness. Once again wonderful video! Keep up the great work and keep up the experimenting! It's the most beautiful part of this hobby! 73s de KE0SBX
Ohhhhh the bulb is an amazing idea. Thank you so much for this. I will try this too as it makes it even more old school 😁😁. 73, YO6DXE and thank you so much for watching.
I think that is the reason I picked this one as my first transmitter build three years ago. I have quite a few of them around build for diferent bands. I only discovered later than the 1000pF capacitor is there to make the transmitter work for other bands also haha. 73, YO6DXE.
Hello my friend! I think it would be a great idea if you could do a video on some simple band pass filters for such transmitters, like this 10 minute transmitter or some of your other transmitter projects. Maybe for the "main" bands, like 80m, 40m, 30m, 20m.
There is already one that I posted just a little while ago where I was talking about it on the 700mW minimalist transmitter. It's just two - three videos back I can't remember exactly. I hope it helps. 73, YO6DXE.
Hahahaha. OMG Nigel I can't wait to change them. And the paper on the wall too 😅. I got the camper from a Swedish girl and had no time to redecorate 😅. I have to go back in the mountains soon so I guess I will do this when I come back 😅😅. Have an amazing weekend. We catch up soon with stuff before I leave as I have no cell phone signal up there. 73
Hmmm, I think 15 years ago when I started playing with radio related projects I made several 20 & 40 meter simple oscillators or transmitters & at the time I used fixed valued ceramic capacitors rather than variable. So as to not tie up hard to acquire aluminum finned variable capacitors once you get your sinewave optimized for power without clipping one can use your Nano Vna to measure the set variable capacitor & replace it with a fixed value capacitor. As a side issue, I really do need to focus on learning morse code. Its a neat efficient way of communicating & in spite of being a retired mathematician who had learned a lot of esoteric stuff, I have always been terrible at picking up audible languages other than my native english and that includes Morse Code.
Ohhh yes of course. I have a few versions of this one built for specific bands and I only used a variable capacitor to find the value of the capacitor, then I replaced it with a fixed capacitor. The variable one is a must only if you want to stick to the original design and you want to have an all in one transmitter to use on more bands not just one. I kind of like the idea of using it for more bands though 😅😅. 73, YO6DXE P.S. I also really need to learn the code. I am a mess still and this is what got me into the hobby in the first place. Maybe this year I have more free time for this.
I guess it depends on the instructions given by the one that creates the projects. In mine I usually leave that for the people so at least they do something for that project as well 😁😁. I think is more safe this way also. And thank you for the nice words. 73, YO6DXE
You can go even simpler just get a 4pin crystal oscillator package at 10,20,50 mhz. Connect 5v and a debounced pushbutton You'll get a square wave on the output pin typically, add some lc and antenna Simplest Morse code transmitter Could use that as a carrier to am modulate using a 555timer, op amps, and some extra passives
Just measure the oscillator output in miliwatts you won't get watts of tx without an rf amp But under 50mhz even a few hundred milliwatts can travel far
@@dxexplorer I saw it a while ago but using the rs232 port to control it using some bit banging but a push button is more than enough.... This looks like a mighty mite qrp iirc I remember a similar circuit but they used a MOSFET iirc instead of a normal pnp or npn 73 W4TIA
@Clancydaenlightened Yes yes this one and the Mighty Mite I found on the SolderSmoke blog when I first started building stuff and I love them. But this one I liked the most 😁
That is a little diferent. I haven't tried in this one, but try this if you have the time... imagine the place where you have the crystal now. Put the crystal in series with an inductor in series with a variable capacitor. Basically all three in series and you connect one end of the crystal where it used to be and the free wire of the variable capacitor to where the other end of the crystal used to be in the original schematic. Have look at the video I made a bit earlier on the direct conversion receiver with VXO. It will all make sense.
So how’s the CW coming along ???? Have you managed to line up a QSO ??? Here in Aus, VK2KI Mark has coordinated a QRS QSO party that kicks off on 40m. We’ve been lining up some QSOs with some euro stations on 20 and 15m Kicks off at 7:00Z and wraps up around 13:00Z every Tuesday Focus is on slower speeds and clean code for people to hone their skills on the air. It’s getting a little crowded during prime time. Tapers off as we head towards midnight our time Might be worth while having a listen on some of the Aussie SDRs.
Sadly not much time for amateur radio for me. Just work work and more work and a couple of other projects I must work on. I barely manage to open the transceiver. Hopefully in late October things chill down and I get back to the hobby a little. Other than that... just the usual trying to make some time to still make a video now and then. From Sept 15th going back up in the mountains for two weeks... so maybe there I have a bit of time. I just installed an antenna there at the camp and a 100w Yaesu transceiver.
Is the same here in Romania my friend. I usually search for second hand ones that people sell here and there. Also eBay should be an option as I remember I used to see many of them. I don't like eBay so I try to search for them on local websites or amateur radio websites that also sell second hand gear. 73, YO6DXE. P.S. Those cheap radios that have little plastic variable capacitors... sometimes they have 220pF capacitors in them. Those are still ok for some frequencies and if you place a fixed capacitor that is also 220pF in parallel with the variable one and use a switch to switch it in and out, then you can play with a total value of 440pF. That should cover quite a lot.
When I was young and poor, I MADE variable capacitors out of soup can lids, small nuts and long bolts. If you understand how the component works, you are not restricted to what you can buy.
Good to see you are still working on the home brew projects mate.
I really appreciate you making the video's.
Thank you as well for watching. Is the only reason I enjoy making the videos. 73, YO6DXE.
Started watching yr channel few years ago, brilliant!! Cheers n 73
Thank you so much. I really wish I had more free time for it but... work is work and the fun part... where there is free time 😁. 73, YO6DXE
Excellent job Ciprian! Thank you for keeping up with this project. You have inspired me to try my hand at building it, Im actually ordering the materials in bits and pieces now! I saw another schematic of the TMT on another ham's website where he put a 6V wheat grain bulb in series between the capacitor and the antenna output. This I think would help give the operator a good visual indication, i.e., tune for maximum brightness.
Once again wonderful video! Keep up the great work and keep up the experimenting! It's the most beautiful part of this hobby! 73s de KE0SBX
Ohhhhh the bulb is an amazing idea. Thank you so much for this. I will try this too as it makes it even more old school 😁😁. 73, YO6DXE and thank you so much for watching.
Brilliant, yet so simple. 73s
I think that is the reason I picked this one as my first transmitter build three years ago. I have quite a few of them around build for diferent bands. I only discovered later than the 1000pF capacitor is there to make the transmitter work for other bands also haha. 73, YO6DXE.
Hello my friend! I think it would be a great idea if you could do a video on some simple band pass filters for such transmitters, like this 10 minute transmitter or some of your other transmitter projects. Maybe for the "main" bands, like 80m, 40m, 30m, 20m.
Or low pass filter..
There is already one that I posted just a little while ago where I was talking about it on the 700mW minimalist transmitter. It's just two - three videos back I can't remember exactly. I hope it helps. 73, YO6DXE.
www.gqrp.com/Datasheet_W3NQN.pdf
😁🙏🙏🙏 73, YO6DXE
Cool curtains! Im worried. 😂
Hahahaha. OMG Nigel I can't wait to change them. And the paper on the wall too 😅. I got the camper from a Swedish girl and had no time to redecorate 😅. I have to go back in the mountains soon so I guess I will do this when I come back 😅😅. Have an amazing weekend. We catch up soon with stuff before I leave as I have no cell phone signal up there. 73
Hmmm, I think 15 years ago when I started playing with radio related projects I made several 20 & 40 meter simple oscillators or transmitters & at the time I used fixed valued ceramic capacitors rather than variable.
So as to not tie up hard to acquire aluminum finned variable capacitors once you get your sinewave optimized for power without clipping one can use your Nano Vna to measure the set variable capacitor & replace it with a fixed value capacitor.
As a side issue, I really do need to focus on learning morse code. Its a neat efficient way of communicating & in spite of being a retired mathematician who had learned a lot of esoteric stuff, I have always been terrible at picking up audible languages other than my native english and that includes Morse Code.
Ohhh yes of course. I have a few versions of this one built for specific bands and I only used a variable capacitor to find the value of the capacitor, then I replaced it with a fixed capacitor. The variable one is a must only if you want to stick to the original design and you want to have an all in one transmitter to use on more bands not just one. I kind of like the idea of using it for more bands though 😅😅. 73, YO6DXE
P.S. I also really need to learn the code. I am a mess still and this is what got me into the hobby in the first place. Maybe this year I have more free time for this.
Thanks for your high quality videos.
Will PCBWays also assemble inductors and toroids?
I guess it depends on the instructions given by the one that creates the projects. In mine I usually leave that for the people so at least they do something for that project as well 😁😁. I think is more safe this way also. And thank you for the nice words. 73, YO6DXE
Good hint on using a metal can + heatsink, I will do that when trying this out. 73 yu4hak
Ohhh yes. I know because I ended up in smoke with many plastic enclosed transistors hahaha.
You can go even simpler just get a 4pin crystal oscillator package at 10,20,50 mhz. Connect 5v and a debounced pushbutton
You'll get a square wave on the output pin typically, add some lc and antenna
Simplest Morse code transmitter
Could use that as a carrier to am modulate using a 555timer, op amps, and some extra passives
Not tunable but operates at the frequency of the quarts and possibly harmonics of it,
Or use it in a pll and get wider tx freqs
Ohhhh yes this one too. I think I had it on a paper somewhere on the to try list 😁. 73, YO6DXE
Just measure the oscillator output in miliwatts you won't get watts of tx without an rf amp
But under 50mhz even a few hundred milliwatts can travel far
@@dxexplorer I saw it a while ago but using the rs232 port to control it using some bit banging but a push button is more than enough....
This looks like a mighty mite qrp iirc I remember a similar circuit but they used a MOSFET iirc instead of a normal pnp or npn
73 W4TIA
@Clancydaenlightened Yes yes this one and the Mighty Mite I found on the SolderSmoke blog when I first started building stuff and I love them. But this one I liked the most 😁
Nice video.
So you can change bands by changing the crystals but how could you change your frequency in the band say like from 7.05mHz to 7.07mHz?
That is a little diferent. I haven't tried in this one, but try this if you have the time... imagine the place where you have the crystal now. Put the crystal in series with an inductor in series with a variable capacitor. Basically all three in series and you connect one end of the crystal where it used to be and the free wire of the variable capacitor to where the other end of the crystal used to be in the original schematic. Have look at the video I made a bit earlier on the direct conversion receiver with VXO. It will all make sense.
nice
So how’s the CW coming along ???? Have you managed to line up a QSO ???
Here in Aus, VK2KI Mark has coordinated a QRS QSO party that kicks off on 40m.
We’ve been lining up some QSOs with some euro stations on 20 and 15m
Kicks off at 7:00Z and wraps up around 13:00Z every Tuesday
Focus is on slower speeds and clean code for people to hone their skills on the air. It’s getting a little crowded during prime time. Tapers off as we head towards midnight our time
Might be worth while having a listen on some of the Aussie SDRs.
Sadly not much time for amateur radio for me. Just work work and more work and a couple of other projects I must work on. I barely manage to open the transceiver. Hopefully in late October things chill down and I get back to the hobby a little. Other than that... just the usual trying to make some time to still make a video now and then. From Sept 15th going back up in the mountains for two weeks... so maybe there I have a bit of time. I just installed an antenna there at the camp and a 100w Yaesu transceiver.
I just want to ask where you can get the variable capacitors, because here in Hungary it is almost impossible to get them.
I think eBay is the best option. There are even some new fancy ones made by some guy in Cyprus. Also a company named Virial from Ukraine makes them.
@batica81 ohh yes there are many. That is why I didn't put a link as everyone can get them locally. It's a lot easier this way. 73, YO6DXE.
Is the same here in Romania my friend. I usually search for second hand ones that people sell here and there. Also eBay should be an option as I remember I used to see many of them. I don't like eBay so I try to search for them on local websites or amateur radio websites that also sell second hand gear. 73, YO6DXE. P.S. Those cheap radios that have little plastic variable capacitors... sometimes they have 220pF capacitors in them. Those are still ok for some frequencies and if you place a fixed capacitor that is also 220pF in parallel with the variable one and use a switch to switch it in and out, then you can play with a total value of 440pF. That should cover quite a lot.
When I was young and poor, I MADE variable capacitors out of soup can lids, small nuts and long bolts.
If you understand how the component works, you are not restricted to what you can buy.
@raydall3734 That is true. Except when you want it to also look fancy then you start searching for stuff that is hard to find 😅😅😅.
Ofcourse not bad as it a single transistor citcuit.. i like it
I was impressed the first time, I am even more impressed now that I know more about it 😁. Thanks for watching buddy. 73, YO6DXE