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JZ, keep up with good work on the refinement. What is the actual complex impedance profile +/- 100kHz of fLO, where fLO is between 3MHz and 30MHz? Then implement realistic strays? If the impedance is

Ryuji, I made some improvements to my Tayloe simulation model, mostly in the area of clock generation. It had a very positive effect on the impulse response spectrum of the circuit. It is considerably

At least, this explains why some people have very different LPF performance (distance, direction of winding), and why QMX and QDX have very different BPF behavior (because BPF and LPF directly

> > Something like this? I’m hoping to get this onto Etsy soon ?it’s resin > printed, hand finished and painted ?knobs too

Here it is in use. -- Colin - K6JTH http://tangokeys.com

I make these: https://www.thingiverse.com/thing:5352717 Let me know if you want me to ship a set. I have about 20 sets in black right now. -- Colin - K6JTH http://tangokeys.com

For my QCX-Mini (and QMX) i have designed and printed my own tilt feet. https://www.ph2lb.nl/blog/index.php?page=qrp-labs-qcxmini#tilt -- 73 Lex PH2LB https://www.ph2lb.nl/

Many thanks Gyula, I will leave it be! Ellis, GM4GZW

Ellis, If you look at the Zener catalog, you will realize that this is right in the upper limit. It is manufactured with this tolerance. -- Gyula HA3HZ

It has to be lived with. When I built a multi-band Quad antenna, the phenomenon was still present. Frameworks influence each other. Therefore, tuning takes longer. -- Gyula HA3HZ

Hi Sandy Not a problem. Proceed regardless! 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl

I found this thread very useful as I have had a very similar experience. My newly built QMX was connected to a PSU at 7V limited to 200mA as suggested in the documentation. As soon as I pressed the

I noticed after all the excitement of the really twisted sisters transformer 12 volt style I ended up with the two primary leads crossed over into holes opposite from the opening of the T501

Clocked switching itself is linear so that approach/assumption is valid. What cannot be concluded is the mixer's dynamic range or the degree of effects/benefits of having a BPF since all the real life

Ryuji, Yes, it is correct that the spectral roll off of the Dirac approximation must be considered when viewing these results. Regarding other means of seeing the input impedance of the Tayloe, recall

I see. So what I suggested earlier, dividing the voltage by the current and plot as a complex number would solve the problem... not? (Or you could take magnitude of Fourier transform of the raw fake

I changed the inductors in my LPF wound on T27-17 to give a bit extra space between the cores, and in fact I made one of them extra millimeters of leads so that I can move it around. Just moving the

Ryuji, Remember that my Dirac spike is an approximation. A true Dirac Delta would be flat over the entire spectrum. The approximation does not possess that property. It's spectral response is part of

This is no longer speculative. Toroids on QMX boards have some magnetic coupling (most significant on 12/10m). When I made my LPF inductors with several millimeters of leads to move around, the

JZ, indeed. I'm deeply in LPF/BPF/amp area and I don't know if I want to pick up another project. Well, mixer is related to BPF issue but I'd rather see all the right questions reported here :-) So,