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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

Agree It is definitely the case that Tantalum caps do that, surprisingly frequently and without much provocation Unfortunately when they let go, like a Lithium battery there is a self fuelling

Spectrums look fine to me, well within the legal requirements Within your "QMX power and voltage tests" I se the TxV voltages are significantly less than the supply.? I see the same with mine. I

Bruce Rechecked the earths the on/off switch turns QCX on its is visible on the pc to load the software, it the lights up lcd and diplays clearly the splash screen. but nothing after power down and

Colin Thanks for your help.? when the software loads the led lights up and the splash screen is clear to read. but nothing after reboot.

When tuning the VFO signal generator does it limit the display to 200 MHz and 3.5 KHz? If not what does it do when you goes past the chip limits? Thanks richard

Make sure you have the LCD contrast fully anti clockwise. -- Colin - K6JTH http://tangokeys.com

Hello Jeff, I don't have a QDX for 6m, but I modified the QCX MINI to work on 6m, it has been transmitting 24h24 in WSPR mode for more than a year, it has 3W output, I think u. QDX can be modified

Hi All. I have recently sold the rig I used to have running 6m FT8 to monitor for openings. Was wondering if there is anybody that has a QDX set-up and running on 6m? Would love to connect to

Michael, If the buttons and the right encoder don't respond , check the ground connection to the control board, the upper left pin ( or either of the button contacts near the top edge).? Also be sure

Gunnar, If this was a high voltage HW/SW glitch, you should ?have fried the whole 5 V bus, or at least IC402/403. My similar failure occurred at 13+ V but did not take out the 5 V bus, so I don't

I've obtained some spectrum analyser images of the output from my QMX running at 12.5V.? This is in preparation for fitting Zeners so we can check before and after.? This is the before. Is this the