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.
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.
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.
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.....
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It's nice video for beginners.
pcb is looking good 💯.
good luck 🍀
I always try to explain in the simplest way possible. The PCB... ohhh I just love it ❤😁. 73, YO6DXE.
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!
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.
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.
Very useful indeed. Thanks so much for watching. 73, YO6DXE.
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.
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.
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.....
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... )))
Very cool explanation!
Thank you so much 😁🙏🤗
Nice video good content for beginners
Thanks David. I wish I could explain more and better but then I would end up with a documentary 😅. 73, YO6DXE.