7 ways to cut chirp in a simple QRP transmitter
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- Опубликовано: 7 сен 2024
- Have a badly sounding CW transmitter? Consider these tips to remove the chirp.
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Excellent information. I'm venturing into QRP CW as we speak. Cheers
VK5DR
Good video Peter, I was getting worried that you took towards the end to point out a well regulated power supply.
It would possibly be the most important criteria for stable operation.
I like the chirpy sound. Not all the time but it’s not that common in US. And when I hear it I think, wow a cheap unit getting out and sounding different enough that it draws you in.
Agree. Only a little chirp though. Too much is hard to copy under weak signal conditions.
Yi1hxh rafat 73 from baghdad iraq
Why not key the buffer?
Inter electrode capacitance changes with applied voltage. Keying the buffer will alter the VFO frequency causing chirp.
@@FarleyHillBilly What kind of electrode? We're not talking about tubes. Anyway. That makes no sense at all, since the power amplifier needs much more. That's why I suggested keying the buffer and not the final stage.
@@tim46767 Collector to base capacitance. Google ' W1FB Solid State Design for the Radio Amateur ' for a free PDF.
Thanks Peter, I'm finding this all out! Presently I have a 40m transmit stage that isn't too chirpy but the power drops as I transmit for a longer time? Think it might be the driver for the BD139 transistor. The driver is a 2n3053 in a TO-39 metal case. Might try a heat sink on it? Great video 73 de VK2AOE
Yes, definitely have heatsinks on both transistors.
Send faster?
@@Paul_VK3HNif only I could!!! 😂😂
@@vk3yethanks peter