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Hi Sardar;VDD in the QMX+ is 3.3 Volts. Is this what you had your Nano connected to?Can you explain what you mean by "showed 5V" - how was this voltage measured?73; Steve, N3SB

My first word processor came out of _Compute!_ magazine!

DLL?? Perhaps. I was thinking more like JNI (Java Native Interface) in a Java VM. https://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/intro.html In my teens, I spent quite a few hours

Thanks for that info. I actually have ordered some inductors so I’ll wait for the replacement. In the mean time, I had already ordered 2 (accidentally) 15-60 units. I will only need one so I can use

Not being critical, but ... I remembered seeing a pretty clear warning, highlighted in red, about not drawing any appreciable current from the VDD OR VCC rails when interfacing through the dev

And don't worry about trying to connect that lead under the edge of the coil form, which could be very difficult.? Depending on which side of the coil was disconnected (it's hard to tell from your

You definitely have a bad or misplaced component in the Vin circuit.? The voltage should come up in milliseconds.

You likely back-fed 5V from the USB into the un-powered QMX 5V power supply, killing it.? Looking at the schematic, you may have fried Q108 or Q105.? I would check that area of the circuitry.

Sardar, did you measure Vdd when pressing the PWR On command. If you did and it was not there either, you might try a new 5 volt power regulator board. It may have been damaged by the backfeed,

I’ve seen this before. ?It’s difficult to diagnose without a scope. ?But if you have a multimeter you can check the dc bias. ?There should be about 2.5 volts dc on pins 1 & 7 of IC405 & IC406.

Some details: Correction: Arduino on dev board was powered from Vcc (5V) on JP106. Firmware was 27. Can not go to firmware update mode even with the jumper wire (Aux2 to ground). When plugged to PC -

Donald> I totally agree phase of the reflected power is critical for each of the harmonics, thus affecting how the two components from the LPF and SWR will add or subtract,? and affect the peak

Sorry, what do you mean by "V+"?

Don't worry if you need to unwind a turn or two to make slack.? The circuit will still work fine 73, Don N2VGU

Observation: V+ takes a couple of minutes to build up from Vin upon first application of input power. Once 5.15V is reached at V+, push button power on is possible. If the radio is powered down, a

Oh, indeed (and not). So its not an overload but an open connection. The result looks similar, Duty cycle is reaching Duty max and a low Voltage or 0 V is produced by the SMPS. One thing is weird. You

I completed my QMX+ build this AM as soon as UPS delivered my Mouser order and I put that last 1N4007 in.? I had dropped one and of course it was never to be seen again, and I had no 4007's, and

Hello Adrian I will investigate this, and see if I can reproduce it here; If I can reproduce it then it would indeed be a bug and I can fix it. 73 Hans G0UPL http://qrp-labs.com

Hi, I was experimenting with a dev board and Arduino Nano on it powered through QMX+ Vdd. Everything was going on fabulously until I turned radio off while ardiono was plugged to PC through USB for

Just open the devicemanager, without plugged in the qmx. Check what serial ports there are. Then plug in the qmx and you will hear a sound and in the serial ports should change something. nothing