Great Video Ian. Sad to see this series at the end, but excited to watch for the next plan series. I have enjoyed following your videos. Also enjoyed write code for some features and learning and tinkering with Tayloe detector. Love it.
Thank you for the kind comments. Definitely looking forward to the next video - in particular the audio switching. The RF switching I'll do with relays but the audio switching I might be doing with either an FST3253 or a dedicated audio switch like the older CD4052
@@na5y Will you use two FST3253, one for transmit and the other for receive? I plan on using two, line out 2 for TX Quad and line in 2 for RX Quad. Line in 1 for Microphone Line out 1 for Speaker Amp .
Fantastic video Ian. I have really enjoyed the SDR series - especially the testing and verification with Spectrum Analyser and Oscilloscope. Cheers, Jamie, VK2YCJ, Newcastle, Australia.
Great video as always! With awesome results! To answer your question on 1st or 2nd harmonic - The fundamental is the same thing as the first harmonic... so the unwanted ones are 2nd, 3rd etc
Great project! Personally I ended up using yet another tuning capacitor in double-tuned circuit the one that tunes the coupling. Gives an extra degree of freedom. 73s and HNY!
I've found it's always better to have a 4-channel 'scope so you can blow up 2 of them and still be able to look at 2 channels. I use them sort of like spare tires. :)
Thanks Ian for another very interesting video. Happy New Year. Looking forward to some great content in the new year. Sounds very interesting! This series has been enormously useful and will be a great reference. Cheers, 73, VK7IAN
Thanks for the great videos Ian!! Just a question, looking to the filter toroids in the previous video I found that the indicated value for the inductance is quite different from theoretical one calculated for Amidon cores, for example , for 10m the indicated inductance is 1.40uH with 16 turns on T37-6, by computation I found 0.77uH. Is , in your opinion, this difference due to the (primary) winding all bunched to leave room for the other (secondary) winding, as you clearly explain in this video? Many thanks, and have a wonderful new year. Antonio, IW0FCI
I believe the calculation on toroids.info is based on covering the toroid approx 90% of the circumference. How bunched up did you have the 16 turns? You really don't need to leave any space for the secondary - you can simply wind over the top of the primary if you like. Have a great new year yourself Antonio and thank you for the comment!
Thanks for this series Ian, I really enjoyed it ! I have wound plenty of trifilar transformers but never done a bifilar plus separate winding, any chance you could give a brief explanation of how this is done and/or a very short video on it ? I've scoured youtube but failed to find anything useful.
@@pjmccracken Thank you for the kind comments Peter. Here's where I got the idea for the bifilar + separate: www.wb5rvz.org/ensemble_rxtx/09_qse Look down the page for transformer T2. Let me know if this makes sense - its simpler than it sounds ;) You simply wind the bifilar 11T and then wind the single winding over the top of that
