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Hi Peter In that voltage range the 3.3V circuits are active and the CPU is running and drawing power. It is trying to bring up the 5V rail. However the voltage is not high enough to do so. Therefore

Good point, I think I saw something that says it isn't in the boot code but is in the downloaded firmware.? That would make sense.? I'll check once I've got my QMX assembled (It arrives today,

Hi Kees Yes the 3.3V linear to SMPS handover occurs, about 1/4 second after power up. As usual. IF all is well. 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl

Hello Hans, i think I may have came across a small design flaw in the soft power switch circuit. Before I start, I would like to point out it is a minor thing and most people, if any, will never be

QCX Plus is spoken for

Touching L12 seems to increase signal.? I rechecked all the soldered joints on L12 without any change, but there is an 20dB increase.? Would this suggest an issue with IC3?

Has anyone successfully used the QMX with firmware 007 and later with fldigi? Please either send me a message or reply on this forum. I really need to know if others are successfully using fldigi

Both QCX Minis have been spoken for…

BLUF:? I think something is off with the audio chain of the device and I am looking for advice on things to check.? Thinks were working great and now they are not without my ability to pinpoint

Chris, I would still like to have Hans verify the 3.3V Linear Regulator to 3.3V SMPS handoff is implemented in the current Firmware. ..............especially with the higher current measurements seen

Phil, Sure you can do the rework. L504 is an RF Choke to keep the RF away from "TX_BIAS" and "VCC", yet allow DC currents/voltages to flow. Need more magnification to assess the connection, but a

Found the issue, turned out to be a dry joint on L512.? Redid the solder, did a few final checks and new diagnostic sweeps looked ok. Not long after fixing I had my first qmx cw contact on 40m! d

Before the processor is active R101 will pull LIN_REG_EN high which turns Q102 on and this will enable the linear regulator. Q111 is off to stop the SMPS getting involved and Q110 is on to provide a

Thanks to you for the explanation. I’m not sure I can do the rework if in fact the pads and/or inductor are shot. But if I have no TX then I’ll know at least one reason why it’s not working. I

Correction: Got notice of shipping label created.? Not the same as shipped, but happy that it happened in one week nonetheless!

Understood - thanks for the reply. Now I know it hasn't fallen through the cracks! 73, Jim -- Jim / K7TXA Eagle, ID SKCC 10447 BUG 301

From an SK Estate. No exhaustive effort to test, plugged in antenna and key, made a few contacts on each: QCX Mini wired for 80 meters ? ? ?$100.00 QCX Mini wired for 40 meters ? ?

OK, so I've just worked up the enthusiasm to have a second look at this potentially "bricked" QMX Regarding the signal LIN_REG_EN, am I right in assuming this signal is 0v (a logic 0 from the

Hello Jim I'll sort it out. I'm on a few days' family vacation, back in the office on 17th. It has been hard to keep up with emails. 73 Hans

I filed a help ticket three days ago regarding the missing T507 core, but have heard nothing - is there anything else I need to do to get a replacement? The kit is completed with the exception of this