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If one winding is wound different to what the designer intended, then the "forward" and "reverse" sensing of the reflectometer will be reversed.? Hans could provide a configuration parameter to cope

My concern, Dan, is that replacing the cap with a sturdier cap without understanding and correcting why it failed in the first place may just move the next failure to another, and costlier, place. As

I have the same setup with my qdx. The 7809 is inside the qdx stock enclosure. The 7809 tab is bolted to the qdx case for a heat sink. 73 Glenn VE9GJ

I was wrong, but now: I see! it was not a *qst* idea, but one from CQ Magazine: CQ March 2015 QRP Special Page 18: Behold Rockmitey , de ED Cobb *K4YF* R es Ray Kauffman *AJ4YN*. A memorable piece

John, Maybe I should drag my feet. Hard to do. We'll see. Next step is checking for resistance of 3.3 V bus. Waiting on micro clips to test things out. -- 73, Dan? NM3A

I?m not Hans, but I asked him in private about AGC: AGC is not yet implemented. Neither is SWR Meter. I?ll quote Hans directly: "Firmware is getting there, bit by bit" 73 Manuel; DL2MAN

The Lab Power Supply was a very early investment in the uSDX / (tr)uSDX development path, and it paid for itself multiple times..... If you?re a maker, you need one. Can?t put enough emphasis on

Hi Dan, I?m not 100% sure, what was the cause in my case, so I can only guess. But I would look at the real obvious stuff: - I?ve shortened some of the display wires and gave them another touch

Maybe you should drag your feet a little bit on this repair until more is understood about root cause and corrective action. JZ

Dan, that may be a little too close for comfort. Ten volt 220uF tantalums are available in the same package size. Stack two? Put one on the PS board, one somewhere else on the 5V

Oh one other question. C107 appears to be readily available but it looks like it is only a 6 V tantalum. That doesn't seem like much headroom on a 5 V bus, does it? -- 73, Dan? NM3A

I am slowly working through troubleshooting. 5V bus reads 450 ohms. Powering 5V bus through external power supply shows 90 mA, which seems reasonable. I want to try to power the 3.3V bus with an

Hi Hans, Is the AGC controlled by the S-meter by any chance? I'm asking because the volume control of the latest FW version seems to go completely unpredictably crazy. CW operation (especially with

I've been messing with electronics for most of my life both professionally and for fun. One rule I was taught early on is that you must always employ a current limiting PSU for any new build.

When you say using a 7809, I am assuming that was not added to the QDX, but rather the power supply or in between the PS and QDX. Bob KG5GTE

I look forward to it. Thank you and I do not have mine yet. Jon

Hans, the QMX kit arrived today just in time for the new firmware! We are ready to go :-) 73 Marcel DM3FAM

Once my next QMX kit comes in I will consider putting up a detailed video on assembly.

Roger that Evan! Yes, an oscilloscope is called for here! JZ

John, A failure of one of the two orthogonal outputs of the Si5351 could explain the symptoms.? He measured 2.5 volts on two of the capacitors.? A total failure would have 2.5 volts on only one of