Pititico, QRP CW Transceiver Designed by PY2OHH

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Pititico QRP CW transceiver designed for the 40m band. One of the smallest CW transceivers designed around one 2N2222 transistor by ‪@py2ohh‬ This was the first one I built trying to stay close to the original schematic.
Latest update: I ended up changing the circuit a little for easier adjustment of the TX/RX offset frequency, to remove the AM broadcast band interferences and improve the low pass filter. Check the blog article for details and the latest schematic and PCB board design.
73, YO6DXE
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*** DX EXPLORER:
DX Explorer is a channel with amateur radio related videos on: schematics, reviews, homebrewing and much more.
I am passionate about amateur radio since childhood. I got back into the hobby in 2016, while living aboard my sailboat. I received my license in 2022. I like QRP mostly, experimenting with all modes. But I am old school, so I prefer SSB or CW.
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Опубликовано:

11 сен 2024

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Комментарии : 55

@TheArtofEngineering 2 года назад

Even your “ugly” circuit build is a thing of beauty …. You are a circuit surgeon!! Love the simplicity.

@dxexplorer 2 года назад

Hahaha... thank you. I agree with you too... I also love the simplicity of this one. 73 my friend.

@drewnianyklocek3724 2 года назад

I was already afraid you forgot about the radio. It's fantastic that new material has finally appeared! The El Pititico CW Transceiver looks great in this wooden box. Manhattan Style :D Regards, buddy! 73!

@dxexplorer 2 года назад

I have such a long list of projects to get back to buddy ))) It feels good to be back. 73 my friend.

@multilecful 2 года назад

Good to see you back my friend. Nice job on the spy radio. It already looks like it's been in a war zone 🤣

@dxexplorer 2 года назад

Thank you Nigel. Ohh yes.. a war with the soldering iron and the flames burner hahaha. Just like in war times hahaha. 73... we chat on email later on today.

@Steve-GM0HUU 2 года назад

👍very nice homebrew and impressive output power. Thanks for sharing and Happy New Year.

@dxexplorer 2 года назад

Happy New Year Steve. I'm also impressed with the power output hehe. Time to build some more now that I'm haply with the results on this one.

@sjoerdverhiel7215 2 года назад

Thanks for the video happy new year to you too

@dxexplorer 2 года назад

Happy New Year to you as well my friend. And thank you for watching as well. 73

@madcarew5168 2 года назад

Do appreciate a well made and packaged radio..very nice!!

@dxexplorer 2 года назад

Thank you so much. I really like as well how nice it turned out. I managed to write the "El Pititico" on the top cover as well and it looks even better now )) Thank you one more time. 73

@acestudioscouk-Ace-G0ACE 2 года назад

Hi Ciprian, Good to see you back and Happy New Year to you and yours! I've been checking to see if you have posted a video and am glad to see this one. Looking forward to seeing more in throughout the year. Best 73.

@dxexplorer 2 года назад

Happy New Year my friend. I'm also happy to the back. And I also have a long list of projects to make videos about... I'm behind with the ones from last year... so the list got bigger ))) 73 my friend.

@markmelchiori511 2 года назад

Hello Ciprian, and happy new year to you. I enjoy your videos and projects and I especially liked this project so I built your version of this last night. The RX works as expected but as you discussed, my TX is heating up and shifting frequency after a second or two of key down. Having seen your success, I will continue to work on mine until I can get it to work. I will make it a point to report my findings and experiments to you. Thank you for sharing your projects with the community and 72's de N9AK...

@dxexplorer 2 года назад

Happy New Year Mark... and thank you. I'm glad you like the videos. Today I was lucky and the propagation was great so I had amazing reception on the little guy. I will somehow insert a short clip in the next video. About the transistor heating... you did used a dummy load right ? )) And yes it does get a little hot... especially on 12v with 1W output power. Check the transistor and if you can measure the Hfe over 450 and the Uf around 650 or over. I tested a lot of 2N2222 transistors and the Chinese ones are with an Hfe less than 250 most of the time. Those seem to be unstable and overheat excessively. I hope you get it figured out. I still can't believe mine works so well. Now I just have to build a little amplifier for it so I can use regular headphones. 73 my friend and let me know how things work out for you.

@bhz44 10 месяцев назад

Adorei o Pititico! É como chamo meu filho pequeno!😂

@dxexplorer 10 месяцев назад

Eu também adoro haha. Até o nome o torna fofo. Quero construir versões para todas as bandas de 80m a 10m e ter uma de cada. Mas o Pititico II que fiz para incluir o amplificador de áudio não é mais tão pequeno. Ainda é divertido construí-lo e colocá-lo no ar. 73, YO6DXE.

@4youian 2 года назад

Hi Chip, thanks for another inspirational video. Great to see you back. I really need to learn Morse code and give this a try! Happy New year, Ian, VK7IAN

@dxexplorer 2 года назад

Happy New Year to you as well Ian. Then I have a feeling you may like the next video then ))) I sure must do the same as you. I remember very little of what I've learned twenty years ago. Hopefully is like they say about riding a bicycle hahaha. 73 my friend.

@on6uufrank 2 года назад

looks superb, nice cabinet.

@dxexplorer 2 года назад

Thank you my friend. Ohh yes I'm happy I found that little box. 73

@joyhamradio Год назад

such a soulful design

@dxexplorer Год назад

I like old radios in wooden boxes... and simple schematics. This one is a combination of both 😄😄 Thank you my friend. 73 DE YO6DXE.

@ka2pbo Год назад

Great video ! I just found your channel and having great fun and finding some new QRP build ideas. Thank you for providing the files . I cant wait to give this a try . 72 & 73 !

@dxexplorer Год назад

I did not had much time for the hobby layely... but I will be back with more pretty soon. Glad you like it.. as I also like playing with all sort of simple schematics and make the videos )). 73 DE YO6DXE.

@серёгамлечный Месяц назад

Найди пьезокерамический кварц в виде капли из пластика, они есть в старых цветных телевизорах на 3.580 кГц он в последовательном подключении с переменным конденсатором даст возможность перестраивать частоту во всем cw диапазоне. Удачи!

@dxexplorer Месяц назад

Ohhhh it would be nice. Sadly because the schematic is so simple, it's a little complicated as soon as I try to change the frequency. The offset frequency would be a mess and it will need constant adjustments. But that is a good idea for a little more complicated schematics where the oscillator and offset frequency are more stable. Thank you my friend. 73, YO6DXE.

@janetwinslow2039 Год назад

Great simple circuit. A capacitor across the headphone jack will remove some of the unwanted high-frequency audio.

@dxexplorer Год назад

I love these simple circuits too. Ohh yes that is a great idea... the capacitor I mean. I didn't tried it as I removed the high frequencies in the external amplifier I'm using 😁

@sm3981 Год назад

Good job Sir! 73 from PU2YIS Sao Paulo Brazil

@dxexplorer Год назад

Thank you. I have one more video coming on this with the latest modifications I made to it 😁😁. 73 DE YO6DXE.

@patriciadescheemaecker4613 2 года назад

Again amazing....nice tressure

@dxexplorer 2 года назад

Thank you Patricia. Sorry for the late reply. You already know... not much free time for me )) Hugs.

@DIYElectronics123 2 месяца назад

I would like to see the entire process of the project from creating the enclosure to installation. This is really nice. I'm wondering if the same circuit could be applied with a transistor like 2N2219 or BD135. I doubt BD135 would be good for receive

@dxexplorer 2 месяца назад

2N2219 and BD139 work pretty well. Unfortunately for the entire process I have very little time now. Maybe a little later in the autumn time.

@danamarcy5414 2 года назад

Looks very cute and small. Good to see your back. :-) Ve6KBI Dana

@dxexplorer 2 года назад

Good morning from Transylvania )) It feels very good to be back. Hehe I also like how it turned out. Now I just have to build a tiny amplifier for it and I'm good to go )) 73 and have an amazing week.

@NamasenITN Год назад

So "transceiver" here is used as a synonym of "transmitter" and not of "transmitter + receiver". Correct?

@dxexplorer Год назад

No... is an actual transceiver as transmitter + receiver. But have a look at my latest videos as I have a new version.

@yusup3199 10 месяцев назад

Nice sir..I find for my equipment when hiking thanks to share schema.. how far range it can be reach?

@dxexplorer 10 месяцев назад

Have a look at the latest video... or the article on the blog on Pititico II. It also has the LM386 audio amplifier included so you can use regular headphones. The range.. it depends on the propagation. With 700mW you can sure make QSO's all over Europe in a good day... or no QSO at all if the propagation is not good )). 73, YO6DXE.

@tekno8max872 6 дней назад

Hello, how do you use/configure/connect that wattmeter to be able to measure the power output of your radio emitter. Thanks

@dxexplorer 6 дней назад

This is the one that I am using: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-A_l51lLlydI.htmlsi=DAArgzWHKqEYKOpg But because it already has a 50 Ohm dummy load included, I don't really do much but just to connect it to the output of the transmitter or transceiver and measure the power output. Let me know if you would like to know some particular detail. 73, YO6DXE

@tekno8max872 6 дней назад

@@dxexplorer Thank you very much, love your chanel and your videos

@dxexplorer 6 дней назад

@tekno8max872 Always a pleasure. Thank you as well for watching. 🙏🙏

@maalos Год назад

which values need to be changed in order for it to work on 80m? - around 3.58MHz

@dxexplorer Год назад

I didn't tested that yet. I will try to make an 80m version as well and I get back to you.

@vivekchauhan7468 11 месяцев назад

Hii is there any way to replace crystal with VFO?

@dxexplorer 11 месяцев назад

I thought so too... but I think the VFO has to be a good one. The circuit is really simple so it will may pull the VFO frequency really easy when transmitting. But then it would be no more simplicity in the circuit ))). I am trying to work on something else that also includes a VFO... but it will take me a little as I don't have so much free time.

@vivekchauhan7468 11 месяцев назад

I got the point 😊 and waiting for it.

@dxexplorer 9 месяцев назад

@@vivekchauhan7468 Sorry for the late reply.... the comment keeps going into "likely spam" from RU-vid. Not sure why. Ohh yes I cannot wait to have some time to play and see how that would work.

@deathstalker7344 Год назад

Can i use 7 mhz crystal to 8 mhz crystal ?

@dxexplorer Год назад

What do you mean 7MHz to 8MHz ? Like any frequency between 7 to 8 ? 8MHz is no longer into the amateur radio bands so is illegal. The Pi Filter on the input is normally adjusted to be used for the CW portion of the 40m band ( 7MHz )... so usually you would use a crystal more common for the QRP calling frequency something like 7.030MHz. I hope that was the question )))

@deathstalker7344 Год назад

@@dxexplorer thanks for understanding me