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Hi Hans, I just performed the suggestion and the QMX still does not power down. I followed your instruction on your most recent YouTube video and did not see a short between q103 and q104. Regardless,

A week or so ago someone was trying to start a QMX using a current-limited bench power supply.? He chose his amperage limit appropriately, 250 mA if I recall correctly, but his voltage setting was

Hi Ron, I finally got around to replacing the older chip in the QCX-mini. Indeed, it now transmits CW (I haven't tested WSPR mode yet). Thank you for your help! -Bob

I think you are misunderstanding the windows panel. The "Don't Allow" is a button that you click to disable access. The current state is on the left where it says "Audio, Allow apps and Windows to use

Dr. Pedro, As Ton pointed out, the notes are next to the version download.? The transmitter timeout was done on cessation of audio from the PC. 1_04 - 50 millisecond transmit timeout on cessation

Wayne, I'm a couple of days behind in reading the QRP Labs emails so someone might have already mentioned this, but just in case ... Your setting does NOT allow 'apps and Windosws' to use

Bruce 0 amps i press on button and 160ma and PC picks up QMX,? i load software and the LCD lights up and shows clearly the splash screen.? if i do nothing it stays like that (lcd on and splash

https://qrp-labs.com/qdx.html Description with each firmware version? 73 Ton PA0ARR

Hi, I'm looking, but unable to find, the contents of each firmware upgrade of the QDX transceiver; sort of a release note of each one. Specifically I'm looking for a correction of a problem of the

good afternoon Hans, I am enjoying watching your very informative and helpful video. A thousand thanks. Giuseppe iu8eun

Hi all https://youtu.be/pBZ_SXO-LlM The QRP Labs QMX Multimode Multiband QRP transceiver kit is an amazing combination of performance, features and low price in a very compact package. We have at

Hans, I agree about the component failure scenario being unlikely. I assume that the PWM signal is generated by a HW timer, you are not running a 166 kHz interrupt... What if the software crash writes

Michael, not sure I understand - does the splash screen still show or did it only show one time?? What is the value of the current draw?? You can easily check to see if the 3 volt supply is working

Colin i thought the same, Hans posted (#103064) * Initialize the Flash memory, reset peripherals, configure the system clock, configure the I/O pins * Initialize the DMA (Direct Memory Access

Hello Gunnar If the processor reboots, the PWM signal floats and is pulled low by a resistor. If the application firmware crashes for some reason or hangs up - the interrupt processing continues as

I got the 2M low pass filter and seems pretty straight forward, except one line... " The middle coil should be a little longer (for lower inductance)." What does longer mean? Wider spread on the

Rick, I will repair the board with an axial lead zener of higher power rating and put a ceramic capacitor in place of C107. Then I will fit a large electrolytic somewhere on the main board. I will do

This sounds like it is hanging waiting for the switching regulator to spin up. It will pause the boot sequence till the voltages are correct and the switching regulator duty cycle is in the expected

Hi Chris, thanks for sharing the spectrum images. Although my comment is not useful for you here, I am glad about this publication, because it gives me the opportunity to compare my own measurements

Daniel, I dont agree... The resistance of L101 is 2 Ohm and with a good short circuit in C107 and D108 the voltage rise will be limited by the voltage drop over L101. If the supply voltage is