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Ohhh I was so happy to find this one. I had it on the to do list for a long time. I really like it as well. 73, YO6DXE.

Hahahaha... usually that is what I do as well 😅😅.

Eu nu am de vanzare ca lumea le comanda direct de la PCBWay. Dar trimiteti-mi un email cu adresa si va trimit eu unul ca trebuie sa dau comanda luna asta pentru mine si imi trebuiesc doar 4... deci o sa am unul extra 😁😁. 73, YO6DXE

Ohh yes. It becomes addictive. 😅😅😅

From the original article... the transformer will stay the same no matter what band you build it for. You just have to change the 100pF capacitors from the oscillator circuit. I think the more you go towards 80m the less capacity you need... the more you go towards the 10m band the more capacity you need. I am not sure is just what I remember from playing around with VXO circuits in the past. Everything else will remain the same. Of course... you are using the crystal of choice. I also loved the simplicity and that is the reason I didn't want to "complicate" the circuit trying to improve anything but the VXO. love it just as it is. 73, YO6DXE. Here is a link to the original article: www.dl6zb.de/minimal_art_receiver/Minimal%20Art%20Direct%20Conversion%20Receiver%20with%202%20BJT.html

​@dxexplorer thanks, I might try with an SI5351

@garethsmith7628 I have a VFO from QRP Guys for one of their digital transceivers and I thought about playing with that one as well )).

Is really nice... and so simple and easy to build. 73, YO6DXE.

The oscillator would definitely be better enclosed. I was wondering if using a 4 diores ring mixer would be better. But since I don't know much yet about the DC receivers... I was really into experimenting to see how that works hahaha. Thanks buddy. I need to find a schematic and see how I add the other two. It's easier to understand when I see a schematic 😅.

I had lots of fun with this one. Really nice indeed David. And I didn't even used quality parts... just junk box stuff for testing only. 73 buddy, YO6DXE.

Thank you Klaus. Noooo... I just built the circuit and made little changes. Rolf - DL6ZB that designed the receiver is the genius 😁😁. Really nice project. I love it. 73, YO6DXE.

Ohh yes Nikos. Is like part of the learning process.. with some filtering, some RF amp... maybe a better mixer, a good stable VFO, some CW audio filter and a good AF amp... we end up with something even better. But I start slow so I can understand things first hehe. 73 my friend.

@@dxexplorer Of course but it would be way more complicated haha. Personally i would add only the Cw audio filter and have a nice, simple receiver.

I still want to keep it simple when with all the stuff I described... stick to the basics... just a few more parts and we have it all. 😁😁

@@dxexplorer you are correct. 73 my friend

@@sv2tcb 73 Nikos and good luck there finishing your antenna.

It does sounds nice. Honestly I was not expecting it to sound this nice. I really like it, especially because is so simple. Doing good here... just a little tired. I hope you are way better though 😁. 73 my friend.

Thanks Nigel. I had to cut a little part ... the one when I started looking at the computer as I was talking about you saying ... I finally got away from regens Nigel. But I started laughing badly after that so I had to cut that hahaha. There is the same schematic with two transistors on the AF side for low impedance headphones. It works with 26 Ohms even as it is now but of course the audio is low. But it was a really nice project to play with. I keep looking at schematics for superhet as well. But I will try a few more on DC receivers. Some with the parts I have from you. 73 Nigel. Good luck with your work there. Here... too much work.

That's funny, Chip. Because just the other day i was looking at "offerings to the God of the airwaves" shelf looking at my 4 versions of Sputnik wondering if there will ever be a time they might get a little brother or sister before my soldering iron goes cold forever, and, here it is 😅

@multilecful hahahahaha. This is just the first step. I already have something in my mind but I need to discover some things first 😅😅😅.

If you are using the same frequency counter kit that I used... here is a video with instructions on how to modify it in order to work: ruclips.net/video/0BxpMm6SLoE/видео.htmlsi=WHWpPuE-RLm7evfF On the diode... ohh yes feel free to experiment as much as you want. But if tuning doesn't work with a 1N4001.. chances are there is another problem there. It should work, just that the frequency range you cover may not be as wide. Try checking the potentiometers, especially the RF gain and regen control. Those were the issues I had using new and cheap but really bad quality potentiometers. As soon as I replaced them all worked fine )).

@@dxexplorer Thank you, Ciprian... That's what I need to confirm. 🙏🏻😅🕊️✨ Always love to visit your channel and blog. 😍👍🏻✨

@@hobimonitor Always a pleasure my friend. Shoot me an email if you still can't get it to work and we will make it work no worries. 73

Hahaha. Turns out to be a good one as I love it haha. I don't worry about this.. the phones do it every day to all of us... not sure what is the direction this world is taking... but definitely not the good direction. 73 buddy, YO6DXE.

So happy with the filtering now. It was a mess with the Pixie style one.

Eu am programat frecventele in canale si practic doar schimb canalul la urmatorul... e super usor asa. Si se simte imediat cand trebuie schimbat pentru ca se aude cum se pierde propagarea. Mi-a fost aiurea cu doua statii ca incercam sa si monitorizez cu una, insa e mai comod fara. Daca merge merge daca nu nu ))).

I used this clip and followed the instructions to modify the frequency counter. ruclips.net/video/0BxpMm6SLoE/видео.htmlsi=5Ginm3fp4hsl3CHF

@@dxexplorer Thank you very much

@why.k5max Always a pleasure. 73, YO6DXE

Ohhh yes it has big effect. That is part of the oscillator circuit so with no 470pF capacitor the circuit will not work at all. 73, YO6DXE ( If you don't have a 460pF capacitor you can try 500pF or 1nF for now as a temporary solution and see if it works. It should but the results won't be so great. You can then replaced it later when you have the right value. )

@@dxexplorer Yea, I don't have stock for 470pf, what if I use 1nf, what should I change? coil or something else?

@why.k5max No need to change anything else, is just that the oscillator may not perform so great. Basically it will affect the regeneration of the receiver.

Combined with the antenna yes. Basically you program the radio on the right frequencies... TX on 2m and RX on 70cm... but is important to have a good antenna too and this one seems to do a decent job. So far I am happy with both. Have a look at one of my latest videos where I do some more QSO's via satellite. 73, YO6DXE.

Obrigado Daniel. Dê uma olhada no artigo do blog também (coloquei o link na descrição). Mudei um pouco o esquema e também há um design de PCB. Não é um receptor incrível, mas acho que é fácil de construir e me ofereceu muita satisfação e muitas estações recebidas. 73, YO6DXE

Ohhh for a fixed frequency transceiver or transmitter it wouldn't be bad at all. 😁😁😁 I have to try it.

@@dxexplorer даа, но это уже скорее спортивный интерес, гнаться за таким подавлением в таком маломощном передатчике особо смысла нет, уже при 40dbm подавления, ваши гармоники услышит разве что приемник лежащий рядом на столе)))))

I was really curious to do a test on websdr to see if it can be heard in 14MHz. I also think that it can be heard near the receiver, being so close, but already at a distance, the signal disappears completely, being so weak. I am now waiting for some tests with TinySA because I am very curious.

​@@dxexplorerпоигрался я с этим режекторным фильтром, попробовал с колечком amidon Т37-6(желтенькое, осталось от конструктора trusdx) 16 витков провода 0.5мм и с конденсатором 160pf, а дальше подстраивая растяжением сжатием витков подстраиваем под частоту подавления, в моем случае вышло под -70dbm подавления на частоте 14060, но настроика чувствительна, без приборов такое точно настроить сложно,да и витки потом желательно чем то зафиксировать)))

@piterstein9625 Ohhhh wow. Excellent results. Yes indeed is a little harder to adjust it with ought measurement equipment. But it seems that even with the 1uH inductor made on T37-6 and the 130pF in parallel does a good job. I keep testing it and if I place the transmitter 20 centimeters away from the transceiver the signal is gone completely on 20m. So it must be a good sign I guess. Not sure about the third harmonic, but I will test that one too later on today on another receiver. Thank you for doing the test. I really appreciate this. 73, YO6DXE.

The filter is simulated as 50 Ohm in and 50 Ohm out... I think the only way to adjust the output of the transmitter / transceiver is by adjusting the value of the output capacitor. I have no clue I am not that wise (ha). But this is what I've seen in the past that the more experienced than me that used to do. The Pixie and these simple things I make are pretty much the same it seems. Or maybe an impedance matching transformer ? Thanks Nigel.

@dxexplorer just use a filter calculator and adjust the source impedance that way. It's the only way you can transfer the full energy available out to the load or antenna in our case. Otherwise, you will lose energy in the transformation irrespective of spectral purity. Most filters published on the interweb assume 50 in and 50 out. It's simply not the case as an add-on. Unless the final output has a designed impedance of 50R. It's like putting a 32R speaker on the output of an audio amp designed to drive 4R speakers. It works but nowhere near as good as it could.

@multilecful yes indeed you are right. Technically the designs were published as having 50 Ohms out... so in theory I should be ok. But it doesn't hurt at all to calculate and see 😁. And here we are I must ad one more beer for you to the list 😅😅😅.

The one with three inductors for sure it works way better. I build one in the past with only two inductors and three capacitors and it was doing good already. The reason why I want to see how good the Pi Network filter can get is because all simple transceivers have it... because is really simple I guess. But useless as it seems ))). So to keep things just as simple as they are I am trying to get the best out of it and still keeping it simple. Fingers crossed it works haha. 73 my friend.

@@dxexplorer you know sometimes simple solutions have limits. that's why they invented 2 or 3 inductor version.

@4L1LAT yes of course. That is for sure. But you know... when someone spent so much time in the past to come up with some extremely simple schematic for something that works really nice... it would be nice to keep that simplicity. Feels good to make something out of nearly nothing 😁. The fun part is how far we can push those limitations. The joy of QRP and homebrew stuff at the end 😅.

Morning from Transylvania. Ohhh that would be great. Thanks so much Paul. On the nanoVNA it seems fine... not sure if in the transmitter does a good job too 😁. 73, YO6DXE.

Thank you so much. Ohh I will make you laugh. Every time I update the formula someone tells me is the wrong one hahaha. So I will write it down for me to know it and learn from it. What I did at the end is that I calibrated the meter using an already calibrated power meter so I no longer have to calculate things as honestly I no longer know what is the right formula 😅😅😅. Thank you so much one more time. 73, YO6DXE

Both are just as good. I prefer KM601S when I work at home... or KM602 if portable as is a little smaller. But 95% of the time I am on the 601S.

Yes indeed. I only learned about this afterwards. It took a lot of headaches hahaha and experiencing with both the 49:1 and also the 64:1 transformers to see what works better. Also another problem I noticed was the placement of the RF choke. Since I moved it close to the transceiver the results are way better... and also the type of RF choke seems to matter a lot too. Now I no longer have this antenna as I moved into a new place and I don't have as much space. I am working on building the shortened version that has the coil at the end almost. But talking about the RF choke... while testing the new antenna I realized I had 1:1.3 with the coax RF choke type... and 1:1.04 with the one made with parallel insulated wires. Impedance was the same on both. Is nice in a way that I get to learn and experiment and realize how everything interacts together and influence the result at the end. With headaches or not... is the best hobby as I learned more now than ever. Love it. Thank you for the tips as well. 73, YO6DXE.

Salut Marian. Era la un moment dat un nene pe eBay de mi-a cerut voie sa vanda kit-ul. Nu stiu daca o mai fi ca ba era ba nu mai era si am scos link-ul din articol. Poti sa cauti un pic pe Google. Daca nu doar placute PCB direct de la PCBWay, sau au optiunea de a-l cumpara gata montat de ei, apoi trebuie doar reglat. Uite am gasit link-ul de la nenea de mi-a cerut aprobare sa-l vanda: www.ebay.co.uk/itm/296473243274

The TX frequency always remains the same as its all on the 2m band so I only make changes on the TX frequency. I have 5 channels programed into the radio for each satellite. When the ISS appears on the horizon I am on 437,810MHz... then as it gets closer I change to 437,805... when is right up 437,800 and so on until is gone )). I change the channels by eye looking at the app or by ear. When it starts to sound bad I know is time to move to the next channel basically )). 73, YO6DXE.

Thanks as well Peter and I am happy it worked well. I was expecting storms those days so I was happy we had good weather. Looking forward to the next ones. 73 my friend, YO6DXE.

I haven't done many either. But I should do it more often. Is way too much fun not to. True... ready day and night hahaha. 73 buddy.

Here in Romania is 437.800MHz, but it depends on the location where you are and also you must take in consideration the position of the ISS in order to make minor frequency adjustments. Here is a link with some really useful info that got me started. www.ariss.org/contact-the-iss.html I hope it helps. And also on amsat.uk there is a lot of good info as well. 73, YO6DXE

@@dxexplorer thank you Ciprian 73s from Dubai, the name is Anthony

@graphicventures Always a pleasure Anthony. 73, YO6DXE. Greetings from Transylvania.

How cool hehe. I love these "Frankenstein" constructions. This is what makes them beautiful and unique. Very nice... I want to stick to wood and aluminum combined from now on in most of my builds. Let's see how that will turn out. I miss classic equipment I guess 😁. 73, YO6DXE

Thank you. I am working on making one more. 73, YO6DXE

Unfortunately no. I built it for fun frim stuff I found in the junk box. I do have a PCB design for it available on the blog, or even better the Pititico II that also has the audio amplifier into the circuit as well to make the life easier. Both have articles on the blog. The PCB boards can either be made at home, or ordered from PCBWay. I honestly think is fun to build it from scratch from recovered components. 73, YO6DXE.

Well... take the transmitter as a simple oscillator, same as a VFO. Basically if you tune a receiver on the same frequency as the VFO... you will hear the oscillator sound on that particular frequency. The transmitter is almost the same, except that the power output ( RF ) is a little higher and it has a fixed frequency because we are using the crystal. I beleive the output is AM but I don't want to say stupid things (ha). But since you hear both sidebands I guess it is AM. Basically we receive the tone generated by the oscillator. Not sure if it makes sense what I am saying, too tired after a very long day 😁. 73, YO6DXE.

Your comment doesn't make any sense but what I think the receiver just takes the difference between the signal receiver (in this case only carrier wave) and the frequency from the local oscillator at that receiver so probably the sound you hear would be judt that difference of two frequencies in audiable range. This would mean that I need a special receiver for CW 🤔 Do you hear this sound on a normal portable Radio tuned to amator band frequency?

*signal received

Yep... you got it right. I tried to explain the easy way (ha). Normally yes, for CW and SSB signals you need a receiver that can receive SSB or CW. With a regular AM receiver you may still pick up something depending on the receiver, but in order to hear it properly you will need a BFO ( beat frequency oscillator ). Basically another oscillator 😅. I just tested a receiver now ( AM broadcast receiver ) and see if I can hear CW from the transmitter. I can hear i am transmitting but it sounds more like interrupted static... not the normal transmitter sound.

Ha! I knew it! Thanks for checking and the comment.

I just found an article in an old magazine today about this sort of antenna... from 1970 😁. I also wonder why not so many people use it. And the results are fantastic, plus that I only have 5W to play with so a nice antenna helps a lot. 73, YO6DXE

Those are even better. Or even a 2N2219. Those are bigger and they don't seam to heat up as much as the little 2N2222. If it fits on the board is great 😁. 73, YO6DXE

Cam asa ar trebui da. Apoi majoritatea componentelor sunt recuperate asa ca folosesc ce imi pica la mana ( hi ). Intre timp am cumparat si eu o gramada de componente pana sa aflu ca in RF e un pic altfel si na, acum daca le am musai sa le folosesc.

Ecranata 100% nu as spune. Dar am lipit pe interior peste tot acea folie de aluminiu de o folosesc instalatorii. Este ca o banda de autocolant. Nu e mare lucru comparat cu o cutie metalica in adevaratul sens, insa vad va isi face treaba. Ma rog... isi facea. Acum Pititico asta este la YO6TJJ cadou asa de amintire 😁. 73, YO6DXE. P.S. Vreau sa fac la fel acum cu Pititico II... varianta de aici de pe canal la care i-am pus si amplificator audio.

Yep. Pretty much that's it. Keeping things simple is the best. I just wanted to ad those adjustable "tips" to help me adjust the SWR easier. Works like a charm. And I am re-installing it as we speak on the camper 😅😅. I was just drilling the holes for the cable earlier. 73, YO6DXE

In this video ? I can't remember I must watch it again.

Thank you so much. Still learning new things about this antenna. 73, YO6DXE

Have a look in the video description. I have a link to the blog article and I have the schematic posted in there. Is based on the Lidia Direct Conversion Receiver. Nearly the same circuit.

roWaves used to sell the kit but is no longer available. I had a spare one but I just mailed it to Miami some while ago as a present. Indeed it could be used as part of a transceiver. 73, YO6DXE