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Karl, the instruction page for the output transformer said it helps avoid a very low parasitic resonance on bands from 20 meters and higher. -- 73, Dan - W2DLC

Coming from an age of mainframe computers, I have got the habit of reading manuals and following them word by word. I found the instructions good to follow, in general. However, being academic, I get

I'm running my QMX from a Farnell stabilised bench power supply so I'm not expecting too much noise from that. Additionally I've used a clip on ferrite choke because it appeared that, on transmit,?

That seems odd. Isn't that the usual recommended cap to use on the output of the regulator? Glad you got it fixed! -Al

Brent, like Chris wrote using the terminal is the best way to go on. If you go to your computer helper show him the operational manual. Section 3 provides the information about the terminal

I ran a small test today, with my QMX+ (Rev 1), trying to reproduce a WSPR anomaly that was mentioned on FB. QMX+ in stand-alone WSPR mode (i.e. no PC connected, no WSJT-X) on 20m (14.097200 MHz). The

Brent, There is no need to do another software upload because you have done one.? The LCD backlight coming on shows this.? Hans says so and he should know.? A long press on the volume button

I had the very same issue.? After way too long, I discovered it was my power supply. Bruce

And fixed. Problem? I am running a 7805 for logic and a 7809 for pa. There is a 4700uf electrolytic across the input, 0.33uf caps on both input leads to regulators and 0.1uf caps on the outputs. In

Here is an article that explains it for me: https://www.how2power.com/pdf_view.php?url=/newsletters/1807/H2PowerToday1807_FocusOnMagnetics.pdf My take is that the twisting of the wires together adds

Hey Brent, It sounds like you're nearly there! If you can turn the backlight on and off with the encoder button, then it sounds like you did, in fact, get the firmware loaded! It's much easier than

RF transformers are well understood. But not by me. In my last post I said: The twisted pairs are using 1 wire from the input winding and 1 wire from the output winding, not the more obvious 2

Karl, The first paragraph of the Assembly instructions tells of the painstaking development of the transformers. It tells of many experiments, carefully tested, of the final best outcome. As far as

This deserves a better answer than I can give. The twisted pairs are using 1 wire from the input winding and 1 wire from the output winding, not the more obvious 2 twisted wires on the input winding

It's thoroughly explained in the assembly instructions. Yes, I got the part that it works better for more power out in the higher bands. I would have stood on my head whilst winding if the

It's thoroughly explained in the assembly instructions. Al

For the same reason we use coax to feed our antenna, instead of just running a piece of copper wire from transmitter to antenna. A twisted wire pair has a characteristic impedance, similar to

You are trying to increase the coupling.

Good morning Dan and thanks for replying to my post. ?Your message and instructions seem to make perfect sense to me but I’m in over my head here. I’ve messed something up on my computer, etc.

Why twist the wire in RWTST? What purpose does it serve? -- 73 Karl KI4ZUQ