Pititico 2 CW Transceiver, RF Filters And Dummy Loads

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A quick loot at the final built of the Pititico 2 CW transceiver, together with a short introduction in RF filters and dummy loads for beginners in building transmitters and transceivers.
73, YO6DXE.
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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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[@4L1LAT]

It's nice video for beginners.
pcb is looking good 💯.
good luck 🍀

[@dxexplorer]

I always try to explain in the simplest way possible. The PCB... ohhh I just love it ❤😁. 73, YO6DXE.

[@daisywong-ke1kz]

Very cool explanation!

[@dxexplorer]

Thank you so much 😁🙏🤗

[@QRP.lifestyle]

Nice video good content for beginners

[@dxexplorer]

Thanks David. I wish I could explain more and better but then I would end up with a documentary 😅. 73, YO6DXE.

[@radioguy19510]

You can cool your transistor by clipping an alligator clip on it. A 2N2222 should dissipate 800 mW and with a heat sink up to 1 W. Good video. Thanks!

[@dxexplorer]

Ohhh I forgot about that. I love that idea yes hehehe. Thanks so much. Glad you liked the video and thank you as well for watching. 73, YO6DXE.

[@batica81]

Nice video. Adding a diode and a capacitor to a dummy load makes it much more useful as you can use it with a multimeter to calculate power output. Also choosing resistors that have as little inductance possible (not wire wound, but other materials) is important at higher power and frequencies.

[@dxexplorer]

Very useful indeed. Thanks so much for watching. 73, YO6DXE.

[@radiotec76]

You should replace that PN2222 with a 2N2222a metal can transistor and put a heat sink on it. The transistor would at least have a fighting chance. I discovered the value of heat-sinking the power amplifier transistor when I built my first solid state transmitter in 1977. My Elmer showed me on his oscilloscope how the PA would put out a sine wave for a few seconds before going flat. He tried a few transistors then he put a heat sink on the last transistor and the sine wave was sustained.

[@dxexplorer]

Thank you, yes I agree. That is what I also recommended in the video. Is a much better choice. I prefer the metal can version for transmitters or transceivers. 73, YO6DXE.

[@migalito1955]

I have an old analog oscilloscope that is good to 30 Mhz, but using a SDR receiver with the transmitter on a dummy load is a very good way to see the harmonics, thus whether your filter is working as intended. Actually I think the SDR receiver is easier or faster than the scope. My SDR is a SDRPlay RSP-1 which is their least expensive receiver and cost me around $99 five years ago. It is an excellent receiver.....

[@dxexplorer]

I don't have an SDR, maybe I should try this. Even though I think a tinySA would be a little better. We will see what is the cheaper option... )))