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thanks Jeff! i am using a Tskentcell 12v battery pack, the same one that I use with my QCX Mini. I connected the battery and cable to my QCX Mini and it works fine. I’m not near my computer so I

And you can tell if it for some reason needs firmware: just plug it into your computer with a USB data cable, and see if a new USB drive device shows up on the computer.? If the QMX shows up as a USB

That QMX QMX_plus Startup ( /g/QRPLabs/wiki/36878 ) wiki page is useful. I read it a few weeks ago and then mostly forgot about it as I didn't need the information then. It could have

Thanks for all the useful suggestions and information. I started off by inserting ' sudo adduser $USER dialout' and received notice that I was added to the dial out group. Then when trying to add the

Totally agree Don. Working in a test gear calibration and repair unit at the end of the 70s around half of the stream of ‘modern more reliable’ faulty transistor/IC units were ‘repaired’ by

Another was mixing gold and tin sockets and pins, diffusion soon resulted in formation of intermetallic compounds causing poor contact.? Reseating the IC helped for a while. 73, Don N2VGU

It should power up directly in operating mode since they test it in Turkey before shipping. what is the voltage you are using? ?12v is ideally what you want. if you connect a USB cable and execute a

I just received my prebuilt QMX and it doesn’t power up. I am using the same battery pack and cable that I use for my QCX Mini. I have read that a kit-built QMX will need the firmware installed

Those transistors may be ok. What I would measure is the following voltages while the power button is pressed, all referenced to ground: 1) drain of Q105 (should be same as source of Q102) 2) gate of

I have finally resolved the issue with failure to power down. I disassembled the front panel assembly (which I really hated to do) and discovered a solder whisker between two pins on JP302. Now to try

Hi Rick, On the BMS I used for a homebrew UPS a few years ago, I changed the 5m? parallel shunt resistors for a single 100m?, and it trips as expected if the output load current exceeds 1.5A. The

The wiki page QMX QMX_plus Display problems ( /g/QRPLabs/wiki/37338/213988 ) has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions (

Jerry, why not reading QMX QMX_plus Startup ( /g/QRPLabs/wiki/36878 ) from the QRP Labs Wiki? 73 Ludwig

2nd UPDATE: i checked the voltage upon powering up with the switch on IC101 which should provide 3.3V under normal circumstances as i understand the process.? The max i get at the input of IC101

Another issue is increased unintended inductance and capacitance around those BS170 leads, especially the gate and source leads.? Probably not an issue on 80m, but significant 10m or 6m. Jerry, KE7ER

I've chosen the same board Steve. I found the YouTube video previously referenced ( https://youtu.be/QNENyu97w2A ) AND there are some schematics available on-line. I found that the overcurrent

Sockets are a great idea for development but their extensive use in the 70’s and 80’s in professional equipment revealed that they were ultimately rather less reliable than the devices they held A

On Sat, Nov 23, 2024 at 02:31 AM, Dave (G8PTN) wrote: Jerry, Dave, Thanks! My QMX+ is transmitting again. Replacing the BS170s AND the SN74ACT08 SOIC quad logic gate driver did the trick. 73, Cal

I’m anxiously awaiting the arrival of my QMX+ and assume this should also work on the + model. If no one can confirm this I will do so in about a month. -- 73, W8JH, Joe

Interesting, some good info in that post from Hans. Though I'm quite sure I saw black blocks in the LCD, and that there was no solder joint problem. It's possible I hadn't plugged the front panel