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Hi Pawel, I have never had to adjust the threshold on any of the QDX transceivers I have built (I only run FT8). The one I was testing below was running 1.10 firmware. This problem is very

One more thing, Nick: Because the mux switches you will use to selectively ground the inductors have their parasitic capacitance, you may still see some unplanned strange resonances. Hopefully they

https://qrp-labs.com/qmx.html The schematics are on the QMX page along with the Assembly manual and the Operating manual. Ken, W4KAC

Hans, Great job! Thanks to you and your team for all of their efforts. Looking forward to receiving my two new toys (QMX's) in the upcoming months. Kind regards, Rhett KB4HG

I'm very eager to see how that works out, Nick! Good luck!...JZ KJ4A <nds12321@...> wrote:

I agree that the roll-off of a 2-element HPF isn't great. But as frequency gets lower a given dB/octave equates to more dB/MHz. So I think a switched HPF might still be a good way to keep the

I tried to post a link for the schematic but it does not work...grrr! There is a link on this forum which produce great if not faint diagrams. Another on the same thread "QMX schematics" found a way

I'm just getting to wringing out the QMX after overcoming a few assembly issues.? It is NOT working here with fldigi 4.1.20 under Windows 10. Using flrig as a TS-480SAT, it's working fine with

That's pretty cool.? Thanks for sharing, Timothy.

Mike, I think Karl is asking whether all the holes are tested to prove that they are plated all the way through. Fixturing for that can be done, but it does cost a bit. That said, I think his problem

Then the answer is yes it did work except for the 80/20 issue. I will say that 90% or more of the issues I have and see with others are with the toroids and soldering issues with them. The

I know what follows helps no one today unless you come across some 50 years old enameled wire... We'd simply hold the tip of the wire in an open flame for just a moment then quickly plunge it (the

Good going! Getting a small business running smoothly is not easy but is rewarding. Chris

What I am asking is was this model actually tested before it was "released" as a kit? Aside from some error I undoubtedly made that causes my receiver not to receive, would this thing have worked in

Under the Terminal/Diagnostics Are you getting a Transmit Voltage showing Q507 is being turned on.

Hello happy QRPers Just want to share the QDX PA modification. I want to have the possibility of output power setting. The modification just replaces the L14 by some resistor network and switch.

When my power dropped from 5w to 2w I tacked wires onto the drive side of T501 (actually used D503 and D504 empty holes).? Then you can monitor on a scope if the Q503-Q506 are OK.? In my case I saw

Good to know Karl! Thought that might be so. The main issue is really RX sensitivity. I checked the Config this morning with Putty and all is normal. With so many mixing signals bleeding through and

Very Nice!...JZ

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