In keeping with several other replies to Pierre's topic here, I group I work with uses the 5351 in several of our projects but we don't use them in near the quantity that Hans @ QRP Labs does. When

Thanks for that story, Jerry. I know exactly where you're coming from on the subject of optimization. My story (and I'm not going to try to one-up you!) also includes assembly language programming -

Here https://www.youtube.com/watch?v=3Cerp9CMBRY ;-)

On 2021-06-23 07:01, Julian N4JO wrote: ency) are only really achieved when the inputs are > [...] In high hit-rate situations like encoder interfaces, > the increased overhead of interrupt handler

Tune LPF is only half of the way. You need to tune PA output by L4 to be 50 Ohms or at least close to this value and only than it makes sense to tune LPF with nano VNA.

Thats how I did mine, just used some perf board and socket strips aligned with filter pins, Surprising how easy it is and you can see the performance of the filter as you adjust.

Blowing in the wind! Geoff On Wednesday, 23 June 2021, 17:33:05 BST, Podolsky A <mdjdmi@...> wrote:

Me thinks I will adjust my Low Pass Filters as done by Hans as you don't know all the parameters involved. Lee, w0vt

On Wed, Jun 23, 2021 at 06:19 AM, Timothy Freeze wrote: I have a couple of blue 16x2 displays from my Aurdino collection. Should I replace the display with one of them? The 2nd one, with the 16 pin

But where do I find a working Flux Capacitor?

Yeah. I think I will try to build something out of perf board with some headers for the coils. The caps are pretty easy to desolder from the perf board. I guess I could find the VNA instructions for

That line that you are showing looks like a constructor, maybe from JAVA! That does make the serial connection. The "monitoring serial !" text is sent from the program right into the monitor display

Nothing special; I used the adapter in the link below and installed wire sockets on an old LPF board from Hans. The simply look at the filter cut off VS frequency and adjust the windings until the

I also had a notion that a self calibrating text fixture is probably overkill at 14MHz. The thing assumes that the rest of the network is purely resistive 50 Ohms in both directions. That assumption

All, I have a sudden interest in calculating transformer ratios for solid state power amplifiers. Mostly, because I have a Chinese kit linear I'd like to interface to my QRP radios. Not sure

Would you guys mind doing a little write up on doing this? I am not new to Smith charts and antenna analyzers and understand the working principle of the thing, but I will just be getting my first

On Wed, Jun 23, 2021 at 02:55 AM, Hans Summers wrote: 2) Those who finally understood interrupts, now use interrupts for absolutely everything, and pour scorn on anyone that doesn't I would add also

Would you mind doing a little write up on how you used the VNA and the test fixture? I just ordered a little 20m mini and would like to do exactly what you did. TNX Chris KQ6UP

I have done this several times for the bandpass filter kits and it made life infinitely easier. For the QCX mini I just measured the inductance and capacitance of the circuit and made adjustments

Jerry, I am making an assumption that you have a QCX of one model or the other. Given this, another option is no coax. In other words for 1 to 50 watts and depending on location and what you need to