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We're talking about potential new QDX features. But at this point the QMX features are a superset of the QDX features. Realistically, I doubt Hans has time or motivation to make any big changes to the

Although the USB 3.x standard states "any device" may not draw more that 500 mA, there are "charging standards that allow current draw up to 1,500 mA.? Many laptops and other devices have dedicated

Any tryed to mod the qcxmini for lower power and better battery life. I like to run QRPp wirh a PP3 9v battery on a Rockmite with power 100mW, but would like to have a mod to run qcx transiever on

Hi everyone. I need a little help if you could. I've had my QDX v4 (12volt) up and running for quite some time with no issues. Yesterday I was doing ft8 on 20m and heard a pop and caught a whiff of

Hi Peter There aren't yet full theoretical notes. You can find some stuff in my FDIM 2023 conference proceedings article at http://qrp-labs.com/qmx and a lot of the design is similar to QDX which is

I am powering my QDX from USB directly like Howard for almost a year and no problems. The only difference in my power mod is I removed IC2, 78M05 altogether from QDX pcb. This clears any 12V to 5V

I too am hearing these sidetone clicks in my earphones as I send. I noticed they go away if I raise the sidetone to an uncomfortable level but return when I turn the sidetone level back down. Keith

Hello Peter, The design is described in great detail in the QDX manual, you'll find that there's no other alignment other that tinkering with the

Hi Hans, Thanks a lot, I ignore that feature exists on WSJTX. 73, Quentin VA2HSW/F4HSW

My QMX Rev 2 Putty Diagnostic is showing <.5w with a voltage of 10.1. ?Supply voltage into the QMX was 11.9. ?My SWR/power meter is a good CB unit that shows 2watts on 80m, and about 2.5 watts on

Hi. Last evening I finished assembling my QMX and loaded the firmware. Today I’ll see how she performs. Having built the QCX years ago, I keep searching for the alignment instructions but since

Hi Hans, Thanks again for the great QRP Labs products. You're right about me getting my wires crossed somewhat. I was thinking about the following QMX issue when I made the comment:

Hi Steve, This is not the typical cpu VDD short to ground behavior. ?Check with a DVM in continuity mode for VDD shorted to ground on the main board without any other boards plugged into it. ?You

I am wondering if it is possible to transmit modulated CW using FLDIGI with the QDX ? Would this generate a clean enough signal to be understood over the air? Would it put an undue load on the QDX

Hi, you can also test it with the Diode function if your AVO has it which operate at a higher voltage. But the simplest test if a GND PTT line at the tip of connector is working is if you - enable

Hi William, The product that AJ8S suggests is a *Buck Boost* converter.? ?It converts the input power and current to the set voltage output as long as it is within the range of the device.? It

To DC. If you look at the schematic you see input and output has transformers. DC resistance very low. But reactance to RF is not low. 73 Alan G4ZFQ

Hi Jim. I had made the same assumption as you when I first tested my QMX PTT out after firmware 017 was released and I installed the jumper as you have done. But Hans explained that the circuit in

I measure the ohms between *Ground and In* as well as *Ground and Out*.? To my surprize it is around 0.3 ohms - basically a dead short.? What resistance would be expected here.? The amp seems to

Hi Ludwig Frequency calibration hasn't been implemented yet. It's not high priority because QMX has a high performance 25 MHz TCXO as standard, for it's frequency reference. Unlike QCX where it's an