Sputnik Regenerative Receiver CW, SSB AM, FM - LATEST UPDATE

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A simple regenerative receiver designed for the 40m amateur radio band with decent receiving capabilities, the perfect project for beginners in homebrew radio receivers.
73, YO6DXE
*** BLOG POST:
dxexplorer.com/sputnik-regene...
*** PCB BOARDS:
www.pcbway.com/project/sharep...
*** LATEST VERSION:
• Building And Testing T...
*** OLDER VERSION OF THE RECEIVER:
• Simple Regenerative Re...
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[@dxexplorer]

Now you can order PCB boards from PCBWay: www.pcbway.com/project/shareproject/Sputnik_Regenerative_Receiver_0edb19a9.html 73, YO6DXE

[@sv2tcb]

This video reminded me of the first time i came across this simple receiver scrolling through KZbin. It was really a miracle building it for the first time without using complicating components. After that lots of videos with experiments from a lot of amateur radio operators, all trying to maximize the performance of this little receiver. For me, this receiver got me into the hobby, i hope the same project could get more people interested as it is simple and educational. What can is say? I still love it and i highly recommend it as a great project. Keep up the excellent work!! 73 and i hope we will meet on the air sometime!! 73

[@dxexplorer]

Thank you so much Nikos. Yes... same receiver got me back into the hobby as well. If I didn't started working on this, for sure I would most probably still not have my amateur radio license today. I also still use it a lot... especially when I am working on my laptop, is always on in the background. Love it still. Have an amazing and productive week my friend. Yes we have to try a QSO one of these days. 20m band seems good for the distance between us. 73, YO6DXE. P.S. I still watch your videos from time to time on the receiver ))

[@sv2tcb]

I have to go back listening to the receiver. Right now i am working on antennas. For example the Vertical on my latest video worked great on 20m but i had to use the tuner. I will be back next week and we sould definitely try a qso at least an FT8 one if the propagation is not that great.

[@dxexplorer]

@@sv2tcb Next week sounds amazing, as this week I am also crazy busy. I didn't not opened my transceiver much for the past month or so. Is about time ))

[@alexwild4350]

What made me smile is the no background music but the sound of the radio tuning across the bands. That was smart and cute and made me smile. :)

[@dxexplorer]

You will laugh but... usually that is how I work so I don't get bored, or in most cases fall asleep because when I make the videos I am always tired haha. So I listen to the radio... and sometimes when I start recording I forget about it )). Some people told me they like this so... I stick to this )). 73, YO6DXE.

[@pd1jdw630]

Looks Much Cleaner. 👌🏻 Works perfect. Sounds great. 👌🏻 Well done buddy. 💪🏻

[@dxexplorer]

Thank you so much... ohh yes I also love it and happy is much simpler. Better for beginners. 73 my friend.

[@dovpauzner5093]

Thank you for sharing and all the info, very nice work ! From 4X1PD - 73!

[@dxexplorer]

My pleasure. 73, YO6DXE.

[@RA-Arg]

Fantastic! big hug from Argentina !

[@dxexplorer]

Greetings from Transylvania my friend. 73

[@sm3981]

Very nice my friend! Each time better! Seventy three from Sao Paulo Brazil

[@dxexplorer]

Muito obrigado meu amigo. 73, YO6DXE.

[@zapaterolaurent2307]

Super votre projet. Bravo.

[@dxexplorer]

Thank you so much. New video about this receiver coming tomorrow. 73, YO6DXE.

[@4L1LAT]

It's working nice 😊

[@dxexplorer]

Ohhh yes.. I am really happy it works the way I wanted to.

[@4L1LAT]

@@dxexplorer if you want it to work better as you said it's possible to change capacitors , also it's not necessary but it's good to wound coil on high frequency ceramic. I have seen that people used silver plated wires for coils, I believe it's better but not necessary. Anyway it's good choice to make coil one you have used

[@dxexplorer]

@inventor2540 yes... if you want make it really stable in frequency... you can go a little bit on extremes and do that type of coul... for sure much better... also use temperature compensation capacitors, same as you would use for a VFO... and is stable like a crystal controlled receiver )). But then.. things would get complicated again )) So I leave it as it is hahaha. I spent too much time playing with this one. Time to make others now haha.

[@4L1LAT]

@@dxexplorer you are right the key is it's simplicity, Good luck with new projects, ☺️ 73 my friend

[@dxexplorer]

@inventor2540 Thank you so much my friend. Good luck to you as well. 73

[@iw2epe]

Hallo Ciprian. Nice project, which antenna did you use?

[@dxexplorer]

Thank you so much. I have an End Fed Half Wave from 80m to 10m ... the long version ( 41m with compensation coil 2m from the impedance transformer ).

[@VK4MUD]

I think I saw that you are going to upload the files to PCB Way, have you done that yet or are you going to? Also is there a list of the materials needed to construct the project. It looks like a great starter project for our club building sessions. Thanks & 73. John. VK4MUD.

[@dxexplorer]

Hi John.. no not yet... I am still learning the software 🤦‍♂️ but with work and all that I have little free time. I want to finish this week and post it. I will put the link in the blog post and the download folder. Good idea on the parts list. I will put that too in the download folder as well, I guess for all the projects from now on. Thanks for the idea. For the PCBWay project... try this coming weekend on the blog post as I will do my best to finish it until then. 73, YO6DXE.

[@rccarz5]

What type of blue variable capacitor are your using? I see these all the time in builds and cannot find one. I just build an N1TEV Regen, and used a couple variable caps from a fried old SW receiver. I want to build a Sputnik next, but don't want to spend a lot on these big air variable caps.

[@dxexplorer]

Is just a 10 Kilo Ohm multiturn potentiometer. They are not that expencive. Usually two or three times the price of a regular potentiometer ( the cheaper versions ). Here in Romania at least... they seem to be available in any online store that sells electronic components or parts for robot builds or things like CNC and so on.

[@fredtapp375]

Hi, does anyone have an explanation why the tuning circuit (in series) is not a normal parallel tank circuit? Thanks in advance!

[@dxexplorer]

Morning... it may be different because it may have other type of oscillator than what you may be used to. I also wondered the same thing when I first discovered the schematic. I didn't know about oscillators back then... I just noticed was not like others )))

[@sv2tcb]

Good afternoon. Our local Hamfest is this Saturday. I was invited to display some of my constructions. I will display the sputnik receiver for 20 and 40m. I will also have a bunch of circuits with your callsign and website for credits. I hope you agree. 73 my friend

[@dxexplorer]

You can do all you want Nikos... you put a lot of time and hard work in building a lot of things. On the 23rd we have one here in Romania... only that as usual for me... is all the way in the other side of the country hahaha. I hope I can also make it there. 73, YO6DXE.

[@sv2tcb]

@@dxexplorer ok, i will try to film it, thanks for the permission. Many 73 and i hope to meet you in the bands.

[@dxexplorer]

@@sv2tcb Sounds great Nikos. I can't wait to watch it then. Good luck there and we catch up soon. 73 buddy.

[@sv2tcb]

@@dxexplorer Good night 73

[@ThinFreddysFlop]

Hi, do u have circuit change drawings for higher frequencies?

[@dxexplorer]

You just have to change the coil and the parallel capacitor ( C16 ). I don't have the details anymore but maybe next week I will do some experimenting and write the details down in the blog post.

[@joewoodchuck3824]

The files aren't recognized on my Android phone. Also the order button just presents another copy of the article. I was very interested.

[@dxexplorer]

The download folder is a zip folder ( compressed ) but is meant for computers mostly not so much for phones. There are apps that you can use to unzip that if you want still. But inside you may have PDF, TXT and JPG files. The ordering link seems to work perfectly as I just checked now: www.pcbway.com/project/shareproject/Sputnik_Regenerative_Receiver_0edb19a9.html

[@jcbacol]

Excelente el radio. Me toco cambiar los transistores 2222 por 3904 a la antena y el bc 458 para el otro 2222 y le agregue a la entrada del lm386, 1 condensador de 47nf con switche para tener las 2 opciones af filtro.. Saludos..

[@dxexplorer]

Ohh perfecto. Sí, sí, sigo haciéndolo así y lo cambio. 2N2222 o 2N3904 funcionan más o menos igual. Quité el "filtro" de audio para simplificar el receptor para principiantes... pero siempre me gusta cómo suena con un condensador extra. Me alegro que estés bien. Te deseo un buen fin de semana. 73, YO6DXE.

[@jcbacol]

Hice otra modificacion, en filamento abs hice un toroide 18mm exterior y 8mm interior con hueco y le agregue papel aluminio, se aumento la señal, pero hasta el momento estoy experimentando señales pitidos fijos , no tengo las herramienta para saber el uH ( se me daño el lcd del RLC T4/T3) por lo q me toca a mano. Aun así sería bueno saber de este tipo de toroide relleno de aluminio. Saludos.

[@dxexplorer]

@jcbacol Para el toroide sólo probé el material T50-2 y T50-6. Por supuesto también el tubo de PVC... hasta ahora con el tubo de PVC parece que obtengo mejores resultados tanto en el factor Q de la bobina como también en la estabilidad en la frecuencia cuando hay cambios importantes de temperatura. Pero es bueno que experimentes con eso porque la mayoría de las veces pueden surgir resultados inusuales y sorprendentes. También quería probar un toroide hecho de PVC... en teoría necesitaría más vueltas para alcanzar la inductancia necesaria, pero el factor Q de la bobina y la estabilidad en frecuencia también deberían mejorar. Nunca tuve tiempo de probar eso todavía.

[@captmohelsaadany6751]

great

[@dxexplorer]

Finally the last modification ))) But it works as I wanted to. 73, YO6DXE.

[@captmohelsaadany6751]

@@dxexplorer Perfect as always ❤️❤️😍👍

[@dxexplorer]

🙏🙏🙏

[@DarrenSteele-mx3ks]

Ok, I just subscribed to your channel and signed on to PCBWAY I have a ham radio license as well do you sell this item assembled, and how much? Thank you Sorry I keep adding to my comment can this also pick up shortwave and or will you show a video of one that is easy to build again Thanks!

[@dxexplorer]

Hi Darren. At the moment no I don't sell any. I will maybe next year but not sure when. But you can order the finished version from PCBWay. You have two options there... PCB board or completely with parts installed. You will only have to build the coil on your own. We talk about it on your other comment ))). I will present some other receivers more simple than this one too. Not sure if they will also work well on SSB and CW. But you can modify this one to also receive shortwave as well not just the 40m band.

[@vszilard]

Did you solved the 741 opamp issue?

[@dxexplorer]

I do not use 741 in this project. That was for the Pixie with CW filter. But yes problem solved 😁.

[@hl2dus1]

AF IC = KA2213 (better than LM386) Sanyo IC is Original.

[@dxexplorer]

I will have a look and search about it. Never heard about it before. Thanks so much.

[@lucasmarjona]

Very nice. A q. where do you get the multi-tank potentiometer? 😊 Thx

[@dxexplorer]

Is available here in online local stores. I also like it as it saves me lots of money I would pay for very nice but expensive variable capacitors. 73, YO6DXE

[@lucasmarjona]

@@dxexplorer Oh I now undestand it was a multi-turn potentiomenter, I was thinking on a variable capacitor... for the factor form... that was my confusioin. Thanks again. 73

[@dxexplorer]

@lucasmarjona Yes yes. I love variable capacitors... the older style aluminum ones... especially with reduction gears... but they are too expensive for me. More stable in frequency though comparing to diodes.

[@lucasmarjona]

Another question. This receiver is capable to demodulate CW? It Will be like SSB with a single tone, so, could be work, isn't it? 🎉

[@dxexplorer]

@lucasmarjona It will demodulate CW but you hear both sidebands...

[@lampyelektronowe]

👍👍👍👌👌👌😁

[@dxexplorer]

🙏🙏🙏 73, YO6DXE

[@instructoruldemeditatie2367]

Mi-am prins urechile cu vreo două-trei radiouri "regenerative"...I must say -simplitatea lor poate fi uneori înșelatătoare..De partea audio nu prea vorbește nimeni ,de amplificarea necesară ...Aici in video vad că folosești un lm386.Semnalul din lm386 e redat direct in difuzor sau folosești alt preamplificator sau amplificator?

[@dxexplorer]

Hahaha... da da si eu mi le-am prins cu schema originala mult mai simpla, cea de la care am plecat... de prin revista Tehnium. Abia a 4-a sau a 5-a oara i-am dat de cap si a mers. Dar am invatat multe. Pentru partea audio... da da e un LM386... dar cu iesire mai mult pentru casti, cum e la Pixie TRX. Motivul a fost ca are consum mai mic a bateriei asa... si e mult mai simplu circuitul. Celalalt receptor pe care-l aratam in clip... are o varianta mai veche a schemei dar devenise complicat. Acela avea un preamp inainte de LM386 asa ca auditia in difuzor era ok. Asa cum e acum... na... se aude si in difuzor... dar slabut. Daca e liniste in camera e ok. Castile sunt ideale totusi.

[@instructoruldemeditatie2367]

@@dxexplorer Ți-am urmărit videourile,am mai comunicat și prin email ,sunt newlife dacă îți mai amintești.Am devenit obsedat de radiouri regenerative...Cred că e și orgoliu de a reuși...Nu prea înțeleg amplificatoarele audio.Stiu de exemplu că lm386 e power amp sau cum îl numesc unii ,dar totuși îl văd folosit și ca amplificator de microfon unde semnalul e de câțiva milivolți probabil ...Am cumpărat niște module ieftine pam8403 parcă ,deși sunt bune la prețul lor ,pentru radio nu sunt sensibile destul..Am văzut pe cineva care folosea un TDA2003 cu schema originala a lui Charles Kitchin și avea volum destul de puternic..Cică TDAul ar avea gain de 80 db..Cine le mai înțelege? 🤨

[@dxexplorer]

@instructoruldemeditatie2367 Da da TDA2003 merge fain. Initial in experimente la inceput tot pe ala am folosit si eu. Doar ca na... nu era asa de usor de gasit peste tot si am trecut la LM386. E micut si nu e perfect... dar face multe. Merge si ca preamp pentru microfon... dar mie imi pare cam zgomotos. As prefera ceva cu un MPF102... si e mai simplu doar cu un transzistor. De celalalt integrat nu stiu. ))) Da da imi aduc aminte ca am vorbit cum sa nu ))

[@instructoruldemeditatie2367]

@@dxexplorer Și eu as prefera mpf102 dar se găsește greu deși sunt multe proiecte cu el.Problema pe care am avut-o când am încercat să recreez circuite vechi ,nu prea mai găsești feturi :D și altele.Fain că ai adăugat fișier pentru comanda directa...E totuși munca ta ..Ar fi fost ceva daca ai fi putut face kituri dar ai dreptate cu produsele chinezești ,am dat și eu de potențiometre de unica folosință. O zi frumoasa!

[@dxexplorer]

@@instructoruldemeditatie2367 Multumesc... inca nu am pus link... trebuie sa fac re design la placuta... in alt soft ca sa expor gerber ... dar in curand o sa fac la toate asa. E mai simplu. Apoi na.. e munca, dar e un fel de multumesc pentru vizionari 😁. Cu MPF102... asa e da... eu am primit cadou 10 buc din Noua Zeilanda de la amicul Nigel... ZL1NAY )).

[@user-gv1yk5gz7z]

اجواء توضيح السلاك المستخدم في دئره الرنين كم رقم السلاك هل واضح السوائل

[@dxexplorer]

All the detailed information is written in the blog article... including the thikness of the wire used and the number of turns. Here is the link one more time. dxexplorer.com/sputnik-regenerative-receiver There are also details in the download folder in the INFO file.

[@nonamex3052]

Did you design this yourself.

[@dxexplorer]

The PCB board you mean ? Or the schematic ? I put it together... I can't really say I designed it since parts of the circuit, in theory appeared long before I was born ))) I just tested a lot of combinations and variations of the schematic making more and more changes to it until I was happy and it was as simple as possible. It can work even better if modified even more 😁😁. But I stop here as I spent too much time with this receiver )))

[@user-gt1kc3je8k]

Хорошо. А можно схему?

[@dxexplorer]

Да, конечно. У меня есть статья, опубликованная в блоге на dxexplorer.com. Я думаю, вы можете использовать один из этих переводчиков для перевода текста, чтобы его также было легко понять. 73 мой друг.

[@user-gv1yk5gz7z]

كم رقم السلاك النحاسي في الملف 24 ام 22

[@dxexplorer]

24 turns / 0.4mm diameter. There are all the details in the blog article. 73

[@user-gv1yk5gz7z]

كيفه كتابه العناصر الاكنرونيه في اللوحه مثل. R1 R2 إلى اخر

[@user-gv1yk5gz7z]

هل في برامج لحساب قيمه الترانستور أو تشغيله

[@dxexplorer]

@@user-gv1yk5gz7z I don't understand what you mean...

[@dxexplorer]

@@user-gv1yk5gz7z Ohhh I don't know I'm sorry. I know you can do circuit simulations in Elsie... but I am not that good yet )). Is just a hobby not a profession so probably I know as much as you do as well.

[@esadcelik6905]

Hf alıcıyı bitirdim fakat henüz bir frekans yakalayamadım

[@dxexplorer]

Ohh great. I guess now you will just have to put it in the band properly. If you don't have a frequency counter, just listen to the online SDR in Holland and adjust the receiver until you hear nearly the same thing on the 40m band. That is how I used to do it before when I had no frequency counter. It takes a little time, but it works. Also make sure the antenna has at least 6-8 meters minimum as is meant to work with a proper antenna and shorter wires may work if the propagation is great, but you won't receive much in the days with poor propagation. Let me know if you need help. 73, YO6DXE.

[@esadcelik6905]

@@dxexplorer frekans sayıcım yok ama yakın zamanda gelecek .TA1EYZ 73

[@dxexplorer]

Ohhh mükemmel. Bu şekilde ayarlamak çok daha kolaydır. 73. İletişimi sürdürüyoruz.

[@esadcelik6905]

@@dxexplorer Sputnik'i yaparken 470pf seramik kapasitör yerine 470pf multilayer kapasitör takmıştım ama bir kaç gündür radyo üzerinde çalışıyordum bir türlü ses alamadım bugün 470pf seramik kapasitör taktım ve Sputnik'i çalıştırdım sonuç olumlu.🙂

[@dxexplorer]

Ohhhh the 470pF in the oscillator circuit ? Glad it works now. Congrats hehehe. I am happy it finally works. I get these days too when things don't always work and usually is something you don't think it will affect the circuit much.

[@GIU897]

NON FUNZIONA COSA POSSO FARE?

[@dxexplorer]

Mandami una email e qualche foto forse vedo qualcosa che non è al posto giusto.

[@weedeater64]

Nevermind pcb boards. These kinds of radios should be built on copper clad, either dead bug or Manhattan. Or just on a chunk of scrap wood with screws and whatnot.

[@dxexplorer]

Ohhh clearly they can be. I also built the first test version of this one the same way 😁. The PCB boards only makes it look pretty.. and in some cases when used portable... a long lasting receiver. I also love the look of the Manhattan style. It gives that feeling that clearly is a homebrew project 😁.

[@multilecful]

🫣 haha good job Chip.

[@dxexplorer]

😅😅 Thank you Nigel. I keep trying to catch up with our "radio show" but I was always free when you are a sleep... time difference. But tomorrow I think I have the time for a reply ))). By the way... open a beer and celebrate... this was the last video on the Sputnik 😅😅😅.

[@tonywright8294]

Just buy a pixie !

[@adistef]

Pixie is a CW transceiver locked on 7023 Khz; This (the Sputnik) is a regen receiver that covers 7000-7200 Khz

[@dxexplorer]

I have a Pixie... but that is a transceiver... this one is a receiver ) 73

[@dxexplorer]

I am also working on a Pixie with an analog VFO )) This way we can cover the entire CW portion of the 40m band. But still work in progress... not much free time for now. 73, YO6DXE.

[@user-pe1id5hv4p]

Тони,купить и дурак сможет!А ты своими руками сделай радио! ☝️

[@dxexplorer]

@@user-pe1id5hv4p Да, приятнее, когда мы используем что-то на 100% созданное нами. Пикси тоже красивая, мне нравится... но это комплект, но это не то удовлетворение.