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To put it another way, what does the same screen look like on a unit that is working normally in receive. Thanks Paul DJ0CU

That's not transmitting, at least as far as the software is concerned. PTT signal and RF output are both off, voltage isn't shown, BIAS SMPS is off. Press T and you should see the difference. Chris,

I have completed my QMX tx works fine on transmit but there is no receive on any band. Attached a picture of the configuration screen. It looks like it's permanently on transmit, what would be the

Paul, maybe flashing your firmware, at that 180 mA limited current, was marginal for getting a good flash. Your startup delays, and failure to shutdown, sound more to me like software issues than

Turn that backlight pot completely counterclockwise to start. Ideal contrast might be a hair off of full left, but anything beyond that is blank screen territory. 50% is definitely a blank screen. As

Paul, I'm glad you got the screen fixed. No, those long delays are not normal. Do a system reset, and if that doesn't work, try re-flashing firmware followed by a system reset. If the problem still

This isn't what I'd expect, my QMX comes on instantly when I press the power on button. It shows the Shut down message a fraction of a second after the long press but doesn't close until I take my

Thanks for getting back Paul. You are correct! In my case it should then trip the current limited supply. However, the QMX doesn't draw current at any time and never goes over my pre-set limit ? To

/Have I misinterpreted something. Some comments on this site suggest that the QMX will turn on (no LED display) and draw current (~150 mA) without a USB cable attached when the left encoder is given a

25 mA is not enough. Hans suggests 250 mA and 7 volts somewhere... I set my current to about 180 mA and it came up. 73, Paul -- AI7JR

Is there some kind of log for QMX issues? Don't want to bore anybody by reporting what's known, or my build defect! Here's what I'm seeing (I've got Firmware version 9 loaded, 7volts, 250ma current

Hello Razvan The SMPS boards are not a risky proposition, my friend. There is a known issue with a proportion of the current batch, having the Q103/Q104 drain short, regrettably. However other than

If anyone wants old populated boards to practice with, let me know ... only ask postage for them. Jim W2JC (nj)

Well I have completed my 12VDC QMX. I have it connected to a current limited power supply set at about 25 mA at 9VDC (yes I'm paranoid). I have a power meter and dummy load on the BNC output. The LED

In my case, it turned out to be that I'd damaged the trace from pin 14 on the LCD to pin 8 of JP304. Fixed it and the display came on. :-) There are still long delays from when I apply power to the

Simple mistake: The micro usb connector was not soldered with all pins. (Units were supplied in June 2023). I have soldered an external micro usb with some short stranded wires to the board, now it

I'm primarily a sound engineer by trade and have some algorithms/code from some audio dsp I've written which I'm willing to share if desired

Hi Kees The 1N4148 diode in the 3.3V power supply is to isolate the 78M33 when the SMPS is being used and the 78M33 is off. Vdd and Vcc rails are NOT connected anywhere. The "Vdd" on

I was unsure of my ability to deal with SMD/SMT but got over it by getting a practice kit. It doesn’t do anything when you are done so you can’t destroy it. Put the parts on and take them off to

Recommendation is not to switch inductors while transmitting. Really pretty easy to peak up noise or signal on Rx, then just use Cin & Cout to fine tune. Rarely do you need to change inductor, but if