Homebrew sBitx LPF Leak 4 - Fixed!
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- Опубликовано: 8 сен 2024
- This is the fifth and final in a series of videos on diagnosing and debugging problems with the transmit chain on my homebrew sBitx transceiver. On this multi-band transceiver only one low pass filter should be in the circuit at a time. I previously demontrated with LEDs that more than one relay was being engergized on transmit and it varied with RF level. Adding a cap to ground to the low side of the coil where it connects to the transistor solved the problem.
More details on the sBitx rig and this problem on my blog:
kk4das.blogspo...
Excellent work, Dean!
Nice work!
Dean, I like seeing you show practical applications that the tinkerer can follow. Please show more of your knowledge and past experiences. Subscribed!!
Stephen, thank you so much for the note. I plan to do more soon. I'm going to go through the latest build board by board and talk through the challenges. Some will be here and some will be on my blog.
Good deal Dean...I was thinking about that the other day with the first videos, usually the LP filter boards in commercial rigs are shielded in some fashion IIRC. How's the enclosure design going? 73 - Dino KLØS
Dino - the enclosure design is mostly in my head - but I bought a wooden craft box made famous by N2CQR and have lined it with copper tape. The plan is to have one ribbon cable from the Pi to the box - or maybe two - one for digital and one for audio. I'm going to 3D print an enclosure for the Pi, hat and touch screen display and set it on top of the wooden enclosure.